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? 2013-2015 microchip technology inc. ds00001567b-page 1 general description the cap1206 is a multiple channel capacitive touch sensor controller. it contains six (6) individual capaci- tive touch sensor inputs with programmable sensitivity for use in touch sensor applications. each sensor input is calibrated to compensate for system parasitic capac- itance and automatically re calibrated to compensate for gradual environmental changes. the cap1206 includes multiple pattern touch recogni- tion that allows the user to select a specific set of but- tons to be touched simultaneously. if this pattern is detected, a status bit is set and an interrupt is gener- ated. the cap1206 has active and standby states, each with its own sensor input configuration controls. power consumption in the standby state is dependent on the number of sensor inputs enabled as well as averaging, sampling time, and cycle time. deep sleep is the low- est power state available, drawing 5a (typical) of cur- rent. in this state, no sensor inputs are active, and communications will wake the device. applications desktop and notebook pcs lcd monitors consumer electronics appliances features six (6) capacitive touch sensor inputs - programmable sensitivity - automatic recalibration - calibrates for parasitic capacitance - individual thresholds for each button multiple button pattern detection power button support press and hold feature for volume-like applica- tions 3.3v or 5v supply analog filtering for system noise sources rf detection and avoidance filters digital emi blocker 8kv esd rating on all pins (hbm) low power operation - 5a quiescent current in deep sleep - 50a quiescent current in standby (1 sensor input monitored) - samples one or more channels in standby smbus / i 2 c compliant communication interface available in a 10-pin 3mm x 3mm dfn rohs compliant package cap1206 6-channel capacitive touch sensor downloaded from: http:///
cap1206 ds00001567b-page 2 ? 2013-2015 microchip technology inc. to our valued customers it is our intention to provide our valued customers with the bes t documentation possible to ensure successful use of your micro chip products. to this end, we will continue to improve our publications to better suit your needs. our publications will be refined and enhanced as new volumes and updates are introduced. if you have any questions or comments regarding this publication, please contact the marketing co mmunications department via e-mail at docerrors@microchip.com . we welcome your feedback. most current data sheet to obtain the most up-to-date version of this data s heet, please register at our worldwide web site at: http://www.microchip.com you can determine the version of a data s heet by examining its literature number found on the bottom outside corner of any page . the last character of the literature number is the version number, (e.g., ds30000000a is version a of document ds30000000). errata an errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur- rent devices. as device/doc umentation issues become known to us, we will publish an errata s heet. the errata will specify the revision of silicon and revision of document to which it applies. to determine if an errata sheet exis ts for a particular device, please check with one of the following: microchips worldwide web site; http://www.microchip.com your local microchip sales office (see last page) when contacting a sales office, please spec ify which device, revision of silicon and data sheet (include -literature number) yo u are using. customer notification system register on our web site at www.microchip.com to receive the most current information on all of our products. downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 3 cap1206 table of contents 1.0 introduction ..................................................................................................................................................................................... 4 2.0 pin description and configuration .................................................................................................................................................. 8 3.0 functional description .................................................................................................... .............................................................. 21 4.0 register descriptions .................................................................................................................................................................... 58 5.0 operational charac teristics ............................................................................................... ............................................................ 69 6.0 package outline ............................................................................................................................................................................ 85 appendix a: data sheet revision history ........................................................................................................................................... 91 the microchip web site ........................................................................................................ .............................................................. 93 customer change notification service ............................................................................................................................................... 93 customer support ............................................................................................................................................................................... 93 product identification system ................................................................................................. ............................................................ 94 downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 4 cap1206 1.0 introduction 1.1 block diagram 1.2 pin diagrams figure 1-1: cap1206 block diagram figure 1-2: cap1206 14-pin soic smbus protocol vdd gnd capacitive touch sensing algorithm cs1 cs2 cs3 cs4 cs5 smclk smdata alert# cs6 cap1206 12 3 4 1413 12 11 56 7 10 98 n/c cs1 alert# smdat smclk n/c n/ccs2 cs3 cs4 cs5 cs6 gnd vdd downloaded from: http:///
cap1206 ds00001567b-page 5 ? 2013-2015 microchip technology inc. figure 1-3: cap1206 pin diag ram (10-pin 3 x 3 mm dfn) table 1-1: pin description for cap1206 qfn pin # soic pin # pin name pin function pin type unused connection 12c s 1 capacitive touch sensor input 1 aio connect to ground 2 3 alert# alert# - active low alert / interrupt out- put for smbus alert - requires pull-up resistor (default) od connect to ground 34s m d a t a smdata - bi-directional, open-drain smbus or i 2 c data - requires pull-up resistor diod n/a 45s m c l k smclk - smbus or i 2 c clock input - requires pull-up resistor di n/a 5 7 vdd positive power supply power n/a 69c s 6 capacitive touch sensor input 6 aio connect to ground 71 0c s 5 capacitive touch sensor input 5 aio connect to ground 81 1c s 4 capacitive touch sensor input 4 aio connect to ground 91 2c s 3 capacitive touch sensor input 3 aio connect to ground 10 13 cs2 capacitive touch sensor input 2 aio connect to ground bottom pad 8g n d ground power n/a cs3 cs2 1 2 3 4 5 cs4 cs1 alert# smdata vdd smclk cs5 cs6 gnd 10 9 8 7 6 downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 6 cap1206 1.3 pin description application note: all digital pins are 5v tolerant pins. the pin types are described in table 1-2, "pin types" . table 1-2: pin types pin type description power this pin is used to supply power or ground to the device. di digital input - this pin is used as a digital input. this pin is 5v tolerant. aio analog input / output - this pin is used as an i/o for analog signals. diod digital input / open drain output - this pin is used as a digital i/o. when it is used as an output, it is open drain and requires a pull- up resistor. this pin is 5v tolerant. od open drain digital output - this pin is used as a digital output. it is open drain and requires a pull-up resistor. this pin is 5v tolerant. downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 7 cap1206 2.0 electrical specifications note 2-1 stresses above those listed could cause permanent damage to the device. this is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied. note 2-2 for the 5v tolerant pins that have a pull- up resistor, the voltage difference between v 5vt_pin and v dd must never exceed 3.6v. note 2-3 the package power dissipation specification assumes a recommended thermal via design consisting of a 2x3 matrix of 0.3m m (12mil) vias at 0.9mm pitch connected to the ground plane with a 1.6 x 2.3mm thermal landing. note 2-4 junction to ambient ( ? ja ) is dependent on the design of the thermal vias. without thermal vias and a thermal landing, the ? ja will be higher. table 2-1: absolute maximum ratings voltage on vdd pin -0.3 to 6.5 v voltage on cs pins to gnd -0.3 to 4.0 v voltage on 5v tolerant pins (v 5vt_pin ) -0.3 to 5.5 v voltage on 5v tolerant pins (|v 5vt_pin - v dd |) (see note 2-2 )0 t o 3 . 6 v input current to any pin except vdd + 10 ma output short circuit current continuous n/a package power dissipation up to t a = 85c for 10-pin dfn (see note 2-3 ) 0.5 w junction to ambient ( ? ja ) (see note 2-4 )7 8 c / w operating ambient temperature range -40 to 125 c storage temperature range -55 to 150 c esd rating, all pins, hbm 8000 v downloaded from: http:///
cap1206 ds00001567b-page 8 ? 2013-2015 microchip technology inc. table 2-2: electrical specifications v dd = 3v to 5.5v, t a = 0c to 85c, all typical values at t a = 25c unless otherwise noted. characteristic symbol mi n typ max unit conditions dc power supply voltage v dd 3.0 5.5 v supply current i stby_def 120 170 a standby state active 1 sensor input monitored default conditions (8 avg, 70ms cycle time) i stby_lp 50 a standby state active 1 sensor input monitored 1 avg, 140ms cycle time i dsleep_3v 5t b d a deep sleep state active no communications t a < 40c 3.135 < v dd < 3.465v i dd 500 750 a capacitive sensing active capacitive touch sensor inputs maximum base capacitance c base 50 pf pad untouched minimum detectable capacitive shift ? c touch 20 ff pad touched - default conditions recommended cap shift ? c touch 0.1 2 pf pad touched - not tested power supply rejection psr 3 10 counts / v untouched current counts base capacitance 5pf - 50pf negative delta counts disabled maximum sensitivity all other parameters default power-on and brown-out reset (see section 4.2, "reset" ) power-on reset voltage v por 1 1.3 v pin states defined power-on reset release voltage v porr 2.85 v rising v dd ensured by design brown-out reset v bor 2.8 v falling v dd vdd rise rate (ensures internal por signal) sv dd 0.05 v/ms 0 to 3v in 60ms power-up timer period t pwrt 10 ms brown-out reset voltage delay t bordc 1 s v dd = v bor - 1 downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 9 cap1206 timing time to communications ready t comm_dly 15 ms time to first conversion ready t conv_dly 170 200 ms i/o pins output low voltage v ol 0.4 v i sink_io = 8ma output high voltage v oh v dd - 0.4 vi source_io = 8ma input high voltage v ih 2.0 v input low voltage v il 0.8 v leakage current i leak 5 a powered or unpowered t a < 85c pull-up voltage < 3.6v if unpowered smbus timing input capacitance c in 5p f clock frequency f smb 10 400 khz spike suppression t sp 50 ns bus free time stop to start t buf 1.3 s start setup time t su:sta 0.6 s start hold time t hd:sta 0.6 s stop setup time t su:sto 0.6 s data hold time t hd:dat 0 s when transmitting to the master data hold time t hd:dat 0.3 s when receiving from the master data setup time t su:dat 0.6 s clock low period t low 1.3 s clock high period t high 0.6 s clock / data fall time t fall 300 ns min = 20+0.1c load ns clock / data rise time t rise 300 ns min = 20+0.1c load ns capacitive load c load 400 pf per bus line table 2-2: electrical specifications (continued) v dd = 3v to 5.5v, t a = 0c to 85c, all typical values at t a = 25c unless otherwise noted. characteristic symbol mi n typ max unit conditions downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 10 cap1206 3.0 communications 3.1 communications the cap1206 communicates using the smbus or i 2 c protocol. 3.2 system management bus the cap1206 communicates with a host controller, such as an mchp sio, through the smbus. the smbus is a two- wire serial communication protocol be tween a computer host and its peripheral devices. a detailed timing diagram is shown in figure 3-1 . stretching of the smclk signal is supported; however, the cap1206 will not stretch the clock sig- nal. 3.2.1 smbus start bit the smbus start bit is defined as a transition of the smbus da ta line from a logic 1 state to a logic 0 state while the smbus clock line is in a logic 1 state. 3.2.2 smbus address and rd / wr bit the smbus address byte consists of the 7-bit client address followed by the rd / wr indicator bit. if this rd / wr bit is a logic 0, then the smbus host is writing data to the client device. if this rd / wr bit is a logic 1, then the smbus host is reading data from the client device. 3.2.3 the cap1206responds to smbus address 0101_000(r/w). smbus data bytes all smbus data bytes are sent most significant bi t first and composed of 8-bits of information. 3.2.4 smbus ack and nack bits the smbus client will acknowledge all data bytes that it re ceives. this is done by the client device pulling the smbus data line low after the 8th bit of each byte that is transmitted. this applies to both the write byte and block write proto- cols. the host will nack (not acknowledge) the last data byte to be received from the client by holding the smbus data line high after the 8th data bit has been sent. for the block read pr otocol, the host will ack each data byte that it receives except the last data byte. 3.2.5 smbus stop bit the smbus stop bit is defined as a transition of the smbus da ta line from a logic 0 state to a logic 1 state while the smbus clock line is in a logic 1 state. when the cap1206 detects an smbus stop bit and it has been communicating with the smbus protocol, it will reset its client inte rface and prepare to receive further communications. figure 3-1: smbus timing diagram smdata smclk t buf p s s - start condition p - stop condition p s t high t low t hd:sta t su:sto t hd:sta t hd:dat t su:dat t su:sta t fall t rise downloaded from: http:///
cap1206 ds00001567b-page 11 ? 2013-2015 microchip technology inc. 3.2.6 smbus timeout the cap1206 includes an smbus timeou t feature. following a 30ms period of inactivity on the smbus where the smclk pin is held low, the device will timeout and reset the smbus interface. the timeout function defaults to disabled. it can be enabled by setting the timeout bit in the configuration register (see section 5.6, "config uration registers" ). 3.2.7 smbus and i 2 c compatibility the major differences between smbus and i 2 c devices are highlighted here. for more information, refer to the smbus 2.0 specification. 1. cap1206supports i 2 c fast mode at 400khz. this covers the smbus max time of 100khz. 2. minimum frequency for smbu s communications is 10khz. 3. the smbus client protocol will reset if the clock is held low longer than 30ms (timeout condition). this can be enabled in the cap1206 by setting the timeout bit in the configuration register. i 2 c does not have a timeout. 4. the smbus client protocol will reset if both the clock and the data line are high for longer than 200us (idle con- dition). this can be enabled in the cap1206by setting the timeout bit in the configuration register. i 2 c does not have an idle condition. 5. i 2 c devices do not support the alert response address functionality (which is optional for smbus). 6. i 2 c devices support block read and write differently. i 2 c protocol allows for unlimited number of bytes to be sent in either direction. the smbus protocol requires that an additional data byte indicating number of bytes to read / write is transmitted. the cap1206 supports i 2 c formatting only. 3.3 smbus protocols the cap1206 is smbus 2.0 compatible and supports write byte, read byte, send byte, and receive byte as valid protocols as shown below. all of the below protocols use the convention in table 3-1 . 3.3.1 smbus write byte the write byte is used to write one byte of data to a specific register as shown in ta b l e 3 - 2 . 3.3.2 smbus read byte the read byte protocol is used to read one byte of data from the registers as shown in table 3-3 . table 3-1: protocol format data sent to device data sent to the host data sent data sent table 3-2: write byte protocol start slave address wr ack register address ack register data ack stop 1 ->0 0101_000 0 0 xxh 0 xxh 0 0 -> 1 downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 12 cap1206 3.3.3 smbus send byte the send byte protocol is used to set the internal address register pointer to the correct address location. no data is transferred during the send byte protocol as shown in ta b l e 3 - 4 . application note: the send byte protocol is not functional in deep sleep (i.e., dsleep bit is set). 3.3.4 smbus receive byte the receive byte protocol is used to read data from a register when the intern al register address pointer is known to be at the right location (e.g. set via send byte). this is us ed for consecutive reads of t he same register as shown in table 3-5 . application note: the receive byte protocol is not functional in deep sleep (i.e., dsleep bit is set). 3.4 i 2 c protocols the cap1206 supports i 2 c block read and block write. the protocols listed below use the convention in ta b l e 3 - 1 . 3.4.1 block read the block read is used to read multiple data bytes from a group of contiguous registers as shown in table 3-6 . application note: when using the block read protocol, the internal address pointer will be automatically incremented after every data byte is received. it will wrap from ffh to 00h. table 3-3: read byte protocol start slave address wr ack register address ack start client address rd ack register data nack stop 1->0 0101_000 0 0 xxh 0 1 ->0 0101_000 1 0 xxh 1 0 -> 1 table 3-4: send byte protocol start slave address wr ack register address ack stop 1 -> 0 0101_000 0 0 xxh 0 0 -> 1 table 3-5: receive byte protocol start slave address rd ack register data nack stop 1 -> 0 0101_000 1 0 xxh 1 0 -> 1 table 3-6: block read protocol start slave address wr ack register address ack start slave address rd ack register data 1->0 0101_000 0 0 xxh 0 1 ->0 0101_000 1 0 xxh ack register data ack register data ack register data ack . . . register data nack stop downloaded from: http:///
cap1206 ds00001567b-page 13 ? 2013-2015 microchip technology inc. 3.4.2 block write the block write is used to write multiple data byte s to a group of contiguous registers as shown in ta b l e 3 - 7 . application note: when using the block write protocol, the in ternal address pointer will be automatically incremented after every data byte is received. it will wrap from ffh to 00h. 0 xxh 0 xxh 0 xxh 0 . . . xxh 1 0 -> 1 table 3-7: block write protocol start slave address wr ack register address ack register data ack 1 ->0 0101_000 0 0 xxh 0 xxh 0 register data ack register data ack . . . register data ack stop xxh 0 xxh 0 . . . xxh 0 0 -> 1 table 3-6: block read protocol downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 14 cap1206 4.0 general description the cap1206 is a multiple channel capacitive touch sensor. it contains six (6) individual capacitive touch sensor inputs with programmable sensitivity for use in touch sensor applications. each sensor input is calibrated to compensate for system parasitic capacitance and automatically recalibrated to compensate for gradual environmental changes. the cap1206includes multiple pattern touch recognition that allows the user to select a sp ecific set of buttons to be touched simultaneously. if this pattern is detected, a status bit is set and an interrupt is generated. the cap1206 has active and standby states, each with its ow n sensor input configuration controls. power consumption in the standby state is dependent on th e number of sensor inputs enabled as well as averaging, sampling time, and cycle time. deep sleep is the lowest power state available, drawing 5a (typical) of curren t. in this state, no sensor inputs are active, and communications will wake the device. the device communicates with a hos t controller using smbus / i 2 c. the host controller may poll the device for updated information at any time or it may configure the device to flag an interrupt whenever a touch is detected on any sensor pad. a typical system diagram is shown in figure 4-1 . 4.1 power states the cap1206 has 3 power states depending on the status of the stby and dsleep bits. w hen the device transitions between power states, previous ly detected touches (f or channels that are being de-act ivated) are cleared and the sen- sor input status bits are reset. 1. active - the normal mode of operation. the device is monitoring capacitive sensor inputs enabled in the active state. 2. standby - when the stby bit is set, the device is monitoring the capacitive sensor inputs enabled in the standby state. interrupts can still be generated based on the enabled channels. the device will still respond to communi- cations normally and can be returned to the active stat e of operation by clearing the stby bit. power consump- figure 4-1: system diagram for cap1206 cap1206 cs4 smdata smclk embedded controller 3.0v to 5.5v alert# cs5 cs6 cs3 cs2 cs1 touch button touch button touch button touch button touch button touch button vdd 3.0v to 5.5v gnd 1.0uf 0.1uf 10kohm resistors downloaded from: http:///
cap1206 ds00001567b-page 15 ? 2013-2015 microchip technology inc. tion in this state is dependent on the number of sensor inputs enabled as well as averaging, sampling time, and cycle time. 3. deep sleep - when the dsleep bit is set, the device is in its lowest power state. it is not monitoring any capac- itive sensor inputs. while in deep sleep, the cap12 06 can be awakened by smbus communications targeting the device. this will not cause the dsleep to be cleare d so the device will return to deep sleep once all com- munications have stopped. the device can be returned to the active state of operation by clearing the dsleep bit. 4.2 reset the power-on reset (por) circuit holds the device in reset until v dd has reached an acceptable level, power-on reset release voltage (v porr ), for minimum operation. the power-up timer (pwr t) is used to extend the start-up period until all device operation conditions have been met. the power-up timer starts after v dd reaches v porr . por and porr with slow rising v dd is shown in figure 4-2 . the brown-out reset (bor) circuit holds the device in reset when v dd falls to a minimum level, v bor for longer than the bor reset delay (t bordc ). after a bor, when v dd rises above v porr , the power-up timer is started again and must finish before reset is released, as shown in figure 4-2 . 4.3 capacitive touch sensing the cap1206 contains six (6) independent capacitive touc h sensor inputs. each sensor input has dynamic range to detect a change of capacitance due to a touch. additionally , each sensor input can be configured to be automatically and routinely recalibrated. 4.3.1 capacitive touc h sensing settings controls for managing capacitive touch sensor inputs are determined by the power state. 4.3.1.1 active state sensing settings the active state is used for normal operation. sensor input s being monitored are determined by the sensor input enable register(see section 5.7, "sensor input enable register" ). sensitivity is controlled by the sensitivity control register (see section 5.5, "sensitivi ty control register" ). averaging, sample time, and cycle time are controlled by the averaging and sampling configuration register (see section 5.10, "averaging and sa mpling configuration register" ). each chan- nel can have a separate touch detection threshold, as de fined in the sensor input threshold registers (see section 5.18, "sensor input threshold registers" ). 4.3.1.2 standby state sensing settings the standby state is used for standby operation. in general, fewer sensor inputs are enabled, and they are programmed to have more sensitivity. sensor inputs being monitore d are determined by the standby channel register (see section 5.20, "standby channel register" ). sensitivity is cont rolled by the standby se nsitivity register (see section 5.22, "standby sensitivity register" ). averaging, sample time, and cycle time are controlled by the averaging and sampling figure 4-2: por and porr with slow rising v dd and bor with falling v dd v dd v bor t pwrt gnd undefined sysrst v por v porr t bordc t pwrt downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 16 cap1206 configuration register (see section 5.21, "standby configuration register" ). there is one touch detection threshold, which applies to all sensors enabled in standby, as defined in the standby threshold register (see section 5.23, "standby threshold register" ). 4.3.2 sensing cycle except when in deep sleep, the device aut omatically initiates a sensing cycle a nd repeats the cycle every time it fin- ishes. the cycle polls through each enabled sensor input starting with cs1 and extending through cs6. as each capac- itive touch sensor input is pol led, its measurement is comp ared against a baseline not t ouched measurement. if the delta measurement is large enough to exceed the applicable thre shold, a touch is detected and an interrupt can be gen- erated (see section 4.8.2, "capacitive sensor input interrupt behavior" ). the sensing cycle time is programmable (see section 5.10, "averaging and samp ling configuration register" and sec- tion 5.21, "standby co nfiguration register" ). if all enabled inputs can be sampled in less than the cycle time, the device is placed into a lower power state for the remainder of the sensing cycle. if the number of active sensor inputs cannot be sampled within the sp ecified cycle time, the cycle time is extended a nd the device is not pl aced in a lower power state. 4.4 sensor input calibration calibration sets the base count registers( section 5.24, "sensor input base count registers" ) which contain the not touched values used for touch detection comparisons. calib ration automatically occurs after a power-on reset (por), when sample time is changed, and whenever a sensor input is newly enabled (for example, when transitioning from a power state in which it was disabled to a power state in wh ich it is enabled). during calibration, the analog sensing cir- cuits are tuned to the capacitance of the untouched pad. then , samples are taken from each sensor input so that a base count can be established. after calibratio n, the untouched delta counts are zero. application note: during the calibration routine, the sensor inputs will not detect a press for up to 200ms and the sensor base count register values wi ll be invalid. in addition, any press on the corresponding sensor pads will invalidate the calibration. the host controller can force a calibration for selected sensor inputs at any time using the calibration activate and status register section 5.10.1, "calibration activate and status register" . when a bit is set, the corresponding capacitive touch sensor input will be calibrated (both analog and digital). the bit is automatically cleared on ce the calibration routine has successfully finished. if analog calibration fails for a sensor input, the corresponding bit is not cleared in the ca libration activate and status register, and the acal_fail bit is set in the general status register( section 5.2, "status registers" ). an interrupt can be generated. analog calibration will fail if a noise bit is set or if the calibration value is at the maximum or minimum value. if digital calibration fails to generate base coun ts for a sensor input in the operating range, which is + 12.5% from the ideal base count (see table 4-1: ), indicating the base capacitance is out of range, the corresponding bc_outx bit is set in the base count out of limit register( section 5.16, "base count out of limit register" ), and the bc_out bit is set in the general status register ( section 5.2, "status registers" ). an interrupt can be generated. by default, when a base count is out of limit, analog calibration is repeated for the sensor input; alternatively, the sensor input can be sampled using the out of limit base count( section 5.6, "configuration registers" ). during normal operation there are various options for recalibr ating the capacitive touch sensor inputs. recalibration is a digital adjustment of the base counts so that the untouched delt a count is zero. after a recalibration, if a sensor inputs base count has shifted + 12.5% from the ideal base count, a full cali bration will be performed on the sensor input. table 4-1: ideal base counts ideal base count sample time 3,200 320us 6,400 640us 12,800 1.28ms 25,600 2.56ms downloaded from: http:///
cap1206 ds00001567b-page 17 ? 2013-2015 microchip technology inc. 4.4.1 automatic recalibration each sensor input is regularly recalibrated at a programmable rate(see cal_cfg[2:0] in section 5.17, "recalibration configuration register" ). by default, the recalibration routine stores the average 64 previous measurements and peri- odically updates the base not touched sett ing for the capacitive touch sensor input. application note: automatic recalibration only works when the del ta count is below the active sensor input threshold. it is disabl ed when a touch is detected. 4.4.2 negative delta count recalibration it is possible that the device loses sensit ivity to a touch. this may happen as a re sult of a noisy envi ronment, recalibra- tion when the pad is touched but delta counts do not exceed the threshold, or other env ironmental changes. when this occurs, the base untouched sensor input may generate negative delta count values. the neg_delta_cnt[1:0] bits(see section 5.17, "recalibration configuration register" ) can be set to force a recalibration after a specified number of consecutive negative delta readings . after a delayed recalibration (see section 4.4.3, "del ayed recalibration" ) the negative delta count recalibration can correct after the touch is released. application note: during this recalibration, the device will not respond to touches. 4.4.3 delayed recalibration it is possible that a stuck button occu rs when something is placed on a button which causes a touch to be detected for a long period. by setting the max_dur_en bit(see section 5.6, "configuration registers" ), a recalibration can be forced when a touch is held on a button for longer than the duration specified in the max_dur[3:0] bits (see section 5.8, "sensor input configuration register" ). note 4-1 delayed recalibration only works when the delta coun t is above the active sensor input threshold. if enabled, it is invoked when a sensor pad touch is held longer than the max_dur bit settings. note 4-2 for the power button, which requires that the bu tton be held longer than a regular button, the time specified by the max_dur[3:0] bits is added to the time required to trigger the qualifying event. this will prevent the power button from being recalibrat ed during the time it is supposed to be held. 4.5 power button the cap1206 has a power button featur e. in general, buttons are set for quick response to a touch, especially when buttons are used for number keypads. however, there are cases where a quick response is not desired, such as when accidentally brushing the power button caus es a device to turn off or on unexpectedly. the power button feature allows a sensor inpu t to be designated as the power button (see section 5.25, "power button register" ). the power button is configured so that a touch mu st be held on the button for a designated period of time before an interrupt is generated; different times can be selected for the standby and the active states (see section 5.26, "power button configuration register" ). the feature can also be enabled / disabled for both states separately. application note: for the power button feature to work in the standby and/or active states, the sensor input must be enabled in the applicable state. after the designated power button has been held for the designated time, an interrupt is generated and the pwr bit is set in the general status register (see section 5.2, "status registers" ). 4.6 multiple touch pattern detection the multiple touch pattern (mtp) detection circuitry can be used to detect lid closure or other similar events. an event can be flagged based on either a minimum number of sensor inputs or on specific sensor inputs simultaneously exceed- ing an mtp threshold or having their noise flag status register bits set. an interrupt can also be generated. during an mtp event, all touches are blocked (see section 5.14, "multiple touch pa ttern configuration register" ). downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 18 cap1206 4.7 noise controls 4.7.1 low frequency noise detection each sensor input has a low frequency noise detector that will sense if low frequency noise is injected onto the input with sufficient power to corrupt the readings. by default, if this occurs, the device will reject the corrupted samplesee dis_ana_noise bit in section 5.6.1, "configuration - 20h" ) and the corresponding bit is set to a logic 1 in the noise flag status register (see show_rf_noise bit in section 5.6.2, "configuration 2 - 44h" ). 4.7.2 rf noise detection each sensor input contains an integrated rf noise detector . this block will detect injected rf noise on the cs pin. the detector threshold is dependent upon the noise frequency. by de fault, if rf noise is detected on a cs line, that sample is removed and not compared against the threshold (see dis_rf_noise bit in section 5.6.2, "c onfiguration 2 - 44h" ). 4.7.3 noise status and configuration the noise flag status (see section 5.3, "noise flag status registers" ) bits can be used to indicate rf and/or other noise. if the show_rf_noise bit in the configuration register (see section 5.6, "configuration registers" ) is set to 0, the noise flag status bit for the capacitive sensor input is set if any analog noise is detected. if the show_rf_noise bit is set to 1, the noise flag stat us bits will only be set if rf noise is detected. the cap1208 offers optional noise filtering controls for both analog and digital noise. for analog noise, there are options for whether the data s hould be considered invalid. by default, the dis_ana_noise bit (see section 5.6.1, "configuration - 20h" ) will block a touch on a sensor input if low frequency analog noise is detected; the sample is discarded. by default, the dis_rf_noise bit (see section 5.6.2, "configuration 2 - 44h" ) will block a touch on a sensor input if rf noi se is detected; the sample is discarded. for digital noise, sensor input noise thresholds can be set (see section 5.19, "sensor input noise threshold register" ). if a capacitive touch sensor input exceeds the sensor nois e threshold but does not exceed the touch threshold (sensor threshold (see section 5.18, "sensor input threshold registers" ) in the active state or sensor standby threshold in the standby state ( section 5.23, "standby threshold register" )), it is determined to be caused by a noise spike. the dis_dig_noise bit (see section 5.6.1, "configuration - 20h" ) can be set to discard sample s that indicate a noise spike so they are not used in the autom atic recalibration routine (see section 4.4.1, "automatic recalibration" ). 4.8 interrupts interrupts are indicated by the setting of th e int bit in the main control register(see section 5.1, "main control regis- ter" ) and by assertion of the alert# pin. the alert# pin is cleared when the int bit is cleared by the user. when the int bit is cleared by the user, status bits may be cleared (see section 5.2, "status registers" ). 4.8.1 alert# pin the alert# pin is an active low output that is driven when an interrupt event is detected. 4.8.2 capacitive sensor input interrupt behavior each sensor input can be programmed to enable / disable interrupts(see section 5.11, "interr upt enable register" ). when enabled for a sensor input and the sensor input is not the designated power butto n, interrupts are generated in one of two ways: 1. an interrupt is generated when a touch is detected and, as a user selectable option, when a release is detected (by default - see int_rel_n in section 5.6.2, "c onfiguration 2 - 44h" ). see figure 4-4: . 2. if the repeat rate is enabled then, so long as the touch is held, another interrupt will be generated based on the programmed repeat rate (see figure 4-3: ). when the repeat rate is enabled for a sensor input (see section 5.12, "repeat rate enable register" ), the device uses an additional control called mpress that determines whethe r a touch is flagged as a simple touch or a press and hold (see section 5.9, "sensor input configuration 2 register" ). the mpress[3:0] bits set a minimum press timer. when the button is touched, the timer begins. if the sensor pad is released before the minimum press timer expires, it is flagged as a touch and an interrupt (if enabled) is generat ed upon release. if the sensor input detects a touch for lon- ger than this timer value, it is flagged as a press and hold event. so long as the touch is held, interrupts will be gener- ated at the programmed repeat rate (see section 5.8, "sensor inpu t configuration register" ) and upon release (if enabled). downloaded from: http:///
cap1206 ds00001567b-page 19 ? 2013-2015 microchip technology inc. if a sensor input is the designated powe r button, an interrupt is not generated as soon as a touch is detected and repeat rate is not applicable. see section 4.8.3, "interrupts for the power button" . application note: figure 4-3: and figure 4-4: show default operation which is to generate an interrupt upon sensor pad release. application note: the host may need to poll the device twice to determine that a release has been detected. 4.8.3 interrupts for the power button interrupts are automatically enabled for the power button wh en the feature is enabled (see section 4.5, "power button" ). a touch must be held on the power button for the desig nated period of time before an interrupt is generated. figure 4-3: sensor interrupt behavior - repeat rate enabled figure 4-4: sensor interrupt be havior - no repeat rate enabled touch detected int bit button status write to int bit sensing cycle (35ms) min press setting (280ms) interrupt on touch button repeat rate (175ms) button repeat rate (175ms) interrupt on release (optional) alert# pin touch detected int bit button status write to int bit sensing cycle (35ms) interrupt on touch interrupt on release (optional) alert# pin downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 20 cap1206 4.8.4 interrupts for multiple touch pattern detection an interrupt can be generated when the mtp pattern is matched (see section 5.14, "multiple touch pattern configura- tion register" ). 4.8.5 interrupts for sensor input calibration failures an interrupt can be generated when the acal_fail bit is set, indicating the failure to complete analog calibration of one or more sensor inputs(see section 5.2, "status registers" ). this interrupt can be enabled by setting the acal_- fail_int bit (see section 5.6, "configuration registers" ). an interrupt can be generated when the bc_out bit is set, i ndicating the base count is out of limit for one or more sen- sor inputs(see section 5.2, "status registers" ). this interrupt can be enabled by setting the bc_out_int bit (see sec- tion 5.6, "configur ation registers" ). downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 21 cap1206 5.0 register description the registers shown in ta b l e 5 - 1 are accessible through the communications prot ocol. an entry of - indicates that the bit is not used and will always read 0. table 5-1: register set in hexadecimal order register address r/w register name function default value page 00h r/w main control controls power states and indicates an interrupt 00h page 24 02h r/w general status stores general status bits 00h page 24 03h r sensor input status returns the state of the sampled capacitive touch sensor inputs 00h page 24 0ah r noise flag status stores the noise flags for sensor inputs 00h page 25 10h r sensor input 1 delta count stores the delta count for cs1 00h page 26 11h r sensor input 2 delta count stores the delta count for cs2 00h page 26 12h r sensor input 3 delta count stores the delta count for cs3 00h page 26 13h r sensor input 4 delta count stores the delta count for cs4 00h page 26 14h r sensor input 5 delta count stores the delta count for cs5 00h page 26 15h r sensor input 6 delta count stores the delta count for cs6 00h page 26 1fh r/w sensitivity control controls the sens itivity of the threshold and delta counts and data scaling of the base counts 2fh page 26 20h r/w configuration controls general functionality 20h page 28 21h r/w sensor input enable controls which sensor inputs are monitored in active 3fh page 29 22h r/w sensor input configuration controls max duration and auto- repeat delay a4h page 30 23h r/w sensor input configuration 2 controls the mpress (press and hold) setting 07h page 31 24h r/w averaging and sampling config controls averaging and sampling window for active 39h page 32 26h r/w calibration activate and status forces calibration for capacitive touch sensor inputs and indicates calibration failure 00h page 34 27h r/w interrupt enable determines which capacitive sensor inputs can generate interrupts 3fh page 35 downloaded from: http:///
cap1206 ds00001567b-page 22 ? 2013-2015 microchip technology inc. 28h r/w repeat rate enable enables repeat rate for specific sensor inputs 3fh page 35 2ah r/w multiple touch configuration determines the number of simultaneous touches to flag a multiple touch condition 80h page 36 2bh r/w multiple touch pattern configuration determines the multiple touch pattern (mtp) configuration 00h page 36 2dh r/w multiple touch pattern determines the pattern or number of sensor inputs used by the mtp circuitry 3fh page 37 2eh r base count out of limit indicates whether sensor inputs have a base count out of limit 00h page 38 2fh r/w recalibration configuration determines recalibration timing and sampling window 8ah page 39 30h r/w sensor input 1 threshold stores the touch detection threshold for active for cs1 40h page 40 31h r/w sensor input 2 threshold stores the touch detection threshold for active for cs2 40h page 40 32h r/w sensor input 3 threshold stores the touch detection threshold for active for cs3 40h page 40 33h r/w sensor input 4 threshold stores the touch detection threshold for active for cs4 40h page 40 34h r/w sensor input 5 threshold stores the touch detection threshold for active for cs5 40h page 40 35h r/w sensor input 6 threshold stores the touch detection threshold for active for cs6 40h page 40 38h r/w sensor input noise threshold stores controls for selecting the noise threshold for all sensor inputs 01h page 41 standby configuration registers 40h r/w standby channel controls which sensor inputs are enabled for standby 00h page 41 41h r/w standby configuration controls averaging and sensing cycle time for standby 39h page 42 42h r/w standby sensitivity controls sensitivity settings used for standby 02h page 43 43h r/w standby threshold stores the touch detection threshold for standby 40h page 44 44h r/w configuration 2 stores additional configuration controls for the device 40h page 28 base count registers table 5-1: register set in hexadecimal order (continued) register address r/w register name function default value page downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 23 cap1206 50h r sensor input 1 base count stores the reference count value for sensor input 1 c8h page 44 51h r sensor input 2 base count stores the reference count value for sensor input 2 c8h page 44 52h r sensor input 3 base count stores the reference count value for sensor input 3 c8h page 44 53h r sensor input 4 base count stores the reference count value for sensor input 4 c8h page 44 54h r sensor input 5 base count stores the reference count value for sensor input 5 c8h page 44 55h r sensor input 6 base count stores the reference count value for sensor input 6 c8h page 44 power button registers 60h r/w power button specifies the power button 00h page 45 61h r/w power button configuration configures the power button feature 22h page 46 calibration registers b1h r sensor input 1 calibration stores the upper 8-bit calibration value for cs1 00h page 46 b2h r sensor input 2 calibration stores the upper 8-bit calibration value for cs2 00h page 46 b3h r sensor input 3 calibration stores the upper 8-bit calibration value for cs3 00h page 46 b4h r sensor input 4 calibration stores the upper 8-bit calibration value for cs4 00h page 46 b5h r sensor input 5 calibration stores the upper 8-bit calibration value for cs5 00h page 46 b6h r sensor input 6 calibration stores the upper 8-bit calibration value for cs6 00h page 46 b9h r sensor input calibration lsb 1 stores the 2 lsbs of the calibration value for cs1 - cs4 00h page 46 bah r sensor input calibration lsb 2 stores the 2 lsbs of the calibration value for cs5 - cs6 00h page 46 id registers fdh r product id stores a fixed value that identifies the cap1206-1 67h page 47 feh r manufacturer id stores a fixed value that identifies mchp 5dh page 47 ffh r revision stores a fixed value that represents the revision number 00h page 47 table 5-1: register set in hexadecimal order (continued) register address r/w register name function default value page downloaded from: http:///
cap1206 ds00001567b-page 24 ? 2013-2015 microchip technology inc. during power-on reset (por), the default values are stored in the registers. a por is in itiated when power is first applied to the part and the voltage on the vdd supply surpa sses the por level as specified in the electrical character- istics. when a bit is set, this means its at a logic 1. w hen a bit is cleared, this means its at a logic 0. 5.1 main control register the main control register controls the primary power state of the device (see section 4.1, "power states" ). bit 5 - stby - enables standby. 0 (default) - the device is not in the standby state. 1 - the device is in the standby state. capacitive touch sensor input scanning is limited to the sensor inputs set in the standby channel register (see section 5.20, "standby channel register" ). the status registers will not be cleared until read. sensor inputs that are no longer sampled will flag a release and then remain in a non-touched state. bit 4 - dsleep - enables deep sleep. 0 (default) - the device is not in the deep sleep state. 1 - the device is in the deep sleep state. all sensor input scanning is disabled. the status registers are automat- ically cleared and the int bit is cleared. when this bit is set, the stby bit has no effect. bit 0 - int - indicates that there is an interrupt (see section 4.8, "interrupts" ). when this bit is set, it asserts the alert# pin. if a channel detects a touch but interr upts are not enabled for that channel (see section 5.11, "interrupt enable reg- ister" ), no action is taken. this bit is cleared by writing a logic 0 to it. when this bit is cleared, the alert# pin will be deasserted, and all status registers will be cleared if the condition has been removed. 0 - no interrupt pending. 1 - an interrupt condition occurred, and the alert# pin has been asserted. 5.2 status registers all status bits are cleared when the device enters deep sleep (dsleep = 1 - see section 5.1, "main control register" ). 5.2.1 general status - 02h bit 6 - bc_out - indicates that the base count is out of limit for one or more enabled sensor inputs (see section 4.4, "sensor input calibration" ). this bit will not be cleared until all enabled sensor inputs have base counts within the limit. 0 - all enabled sensor inputs have base counts in the operating range. 1 - one or more enabled sensor inputs has the base count out of limit. a status bit is set in the base count out of limit register (see section 5.16, "base count out of limit register" ). table 5-2: main control register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 00h r/w main control - - stby dsleep - - - int 00h table 5-3: status registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 02h r general status - bc_ out acal _fail pwr - mult mtp touch 00h 03h r sensor input status - - cs6 cs5 cs4 cs3 cs2 cs1 00h downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 25 cap1206 bit 5 - acal_fail - indicates analog calibration failure for one or more enabled sensor inputs (see section 4.4, "sensor input calibration" ). this bit will not be cleared until all enabled sens or inputs have successfully completed analog cali- bration. 0 - all enabled sensor inputs were successfully calibrated. 1 - one or more enabled sensor inputs failed analog calibr ation. a status bit is set in the calibration active regis- ter (see section 5.10.1, "calibration activate and status register" ). bit 4 - pwr - indicates that the designated power button has been held for the designated time (see section 4.5, "power button" ). this bit will cause the int bit to be set. this bit is cleared when the int bit is cleared if there is no longer a touch on the power button. 0 - the power button has not been held for the required time or is not enabled. 1 - the power button has been held for the required time. bit 2 - mult - indicates that the device is blocking detect ed touches due to the multiple touch detection circuitry (see section 5.13, "multiple touc h configuration register" ). this bit will not cause the in t bit to be set and hence will not cause an interrupt. bit 1 - mtp - indicates that the device has detected a number of sensor inputs th at exceed the mtp threshold either via the pattern recognition or via the number of sensor inputs (see section 5.14, "multiple touch pattern configuration reg- ister" ). this bit will cause the int bit to be set if the mtp_aler t bit is also set. this bit is cleared when the int bit is cleared if the conditio n that caused it to be set has been removed. bit 0 - touch - indicates that a touch was de tected. this bit is set if any bit in the sensor input status register is set. 5.2.2 sensor inpu t status - 03h the sensor input status register stores status bits that indicate a touch has b een detected. a value of 0 in any bit indicates that no touch has been detected. a value of 1 in any bit indicates that a touch has been detected. all bits are cleared when the int bit is cleared and if a touch on the respective capacitive touch sensor input is no longer present. if a touch is still detected, t he bits will not be cleared (but this will not cause the interrupt to be asserted). bit 5 - cs6 - indicates that a touch was detected on sensor input 6. bit 4 - cs5 - indicates that a touch was detected on sensor input 5. bit 3 - cs4 - indicates that a touch was detected on sensor input 4. bit 2 - cs3 - indicates that a touch was detected on sensor input 3. bit 1 - cs2 - indicates that a touch was detected on sensor input 2. bit 0 - cs1 - indicates that a touch was detected on sensor input 1. 5.3 noise flag status registers the noise flag status registers store stat us bits that can be used to indicate that the analog block detected noise above the operating region of the analog detect or or the rf noise detector (see section 4.7.3, "noise status and configura- tion" ). these bits indicate that the most recently received data from the sensor input is invalid and should not be used for touch detection. so long as the bit is set for a particular channel, the delta count value is reset to 00h and thus no touch is detected. these bits are not sticky and will be cl eared automatically if the analog block does not report a noise error. application note: if the mtp detection circuitry is enabled, thes e bits count as sensor inputs above the mtp threshold (see section 4.6, "multiple touch pattern detection" ) even if the corresponding delta count is not. if the corresponding delta co unt also exceeds the mtp threshold, it is not counted twice. table 5-4: noise flag status registers a d d rr / w r e g i s t e r b 7 b 6b 5b 4b 3b 2b 1b 0d e f a u l t 0ah r noise flag status --c s 6 _ noise cs5_ noise cs4_ noise cs3_ noise cs2_ noise cs1_ noise 00h downloaded from: http:///
cap1206 ds00001567b-page 26 ? 2013-2015 microchip technology inc. application note: regardless of the state of t he noise status bits, if low frequency noise is detected on a sensor input, that sample will be discarded unless the dis_ana_noise bit is set. as well, if rf noise is detected on a sensor i nput, that sample will be discarded unless the dis_rf_noise bit is set. 5.4 sensor input delta count registers the sensor input delta count registers store the delta count that is compared against the threshold used to determine if a touch has been detected. the count value represents a change in input due to the capacitance associated with a touch on one of the sensor inputs and is referenced to a calibrated base not touched count value. the delta is an instantaneous change and is updated once per sensor input per sensing cycle (see section 4.3.2, "sensing cycle" ). the value presented is a standard 2s complement number. in addition, the value is capped at a value of 7fh. a reading of 7fh indicates that the sensitivity settings are too high and should be adjusted accordingly (see section 5.5 ). the value is also capped at a negative value of 80h for negative delta counts which may result upon a release. 5.5 sensitivity control register the sensitivity control regi ster controls the sensitiv ity of a touch detection. bits 6-4 delta_sense[2:0] - controls the sensitivity of a touc h detection for sensor inputs enabled in the active state. the sensitivity settings act to scale the relative delta coun t value higher or lower based on the system parameters. a setting of 000b is the most sensitive while a setting of 111b is the least sensitive. at the more sensitive settings, touches are detected for a smaller delta capacitance corresponding to a lighter touch. these se ttings are more sensitive to noise, however, and a noisy environment may flag more false touches with higher sensitivity levels. application note: a value of 128x is the most sensitive setting av ailable. at the most sensitive settings, the msb of the delta count register represents 64 out of ~25,000 which corresponds to a touch of approximately 0.25% of the base capacitance (or a ? c of 25ff from a 10pf base capacitance). conversely, a value of 1x is t he least sensitive setting available. at these table 5-5: sensor input delta count registers a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 10h r sensor input 1 delta count sign 64 32 16 8 4 2 1 00h 11h r sensor input 2 delta count sign 64 32 16 8 4 2 1 00h 12h r sensor input 3 delta count sign 64 32 16 8 4 2 1 00h 13h r sensor input 4 delta count sign 64 32 16 8 4 2 1 00h 14h r sensor input 5 delta count sign 64 32 16 8 4 2 1 00h 15h r sensor input 6 delta count sign 64 32 16 8 4 2 1 00h table 5-6: sensitivit y control register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 1fh r/w sensitivity control - del ta_sense[2:0] base_ shift[3:0] 2fh downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 27 cap1206 settings, the msb of the delta count register corresponds to a delta count of 8192 counts out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance (or a ? c of 3.33pf from a 10pf base capacitance). bits 3 - 0 - base_shift[3:0] - controls the scaling and data presenta tion of the base count registers. the higher the value of these bits, the larger the range and the lower the resolution of the data presented. the scale factor represents the multiplier to the bit-weighting pres ented in these register descriptions. application note: the base_shift[3:0] bits normall y do not need to be updated. t hese settings will not affect touch detection or sensitivity. these bits are sometimes helpful in analyzing the cap sensing board performance and stability. table 5-7: delta_sense bit decode delta_sense[2:0] sensitivity multiplier 210 0 0 0 128x (most sensitive) 001 6 4 x 0 1 0 32x (default) 011 1 6 x 100 8 x 101 4 x 110 2 x 1 1 1 1x - (least sensitive) table 5-8: base_shift bit decode base_shift[3:0] data scaling factor 32 1 0 00 0 0 1 x 00 0 1 2 x 00 1 0 4 x 00 1 1 8 x 01 0 0 1 6 x 01 0 1 3 2 x 01 1 0 6 4 x 0 1 1 1 128x 1 0 0 0 256x all others 256x (default = 1111b) downloaded from: http:///
cap1206 ds00001567b-page 28 ? 2013-2015 microchip technology inc. 5.6 configuration registers the configuration registers control general globa l functionality that affe cts the entire device. 5.6.1 configuration - 20h bit 7 - timeout - enables the timeout and id le functionality of the smbus protocol. 0 (default) - the smbus timeout and idle functionality are disabled. the smbus interf ace will not time out if the clock line is held low. likewise, it will not reset if both the data and clock lines are held high for longer than 200us. 1 - the smbus timeout and idle functionality are enabled . the smbus interface will reset if the clock line is held low for longer than 30ms. likewise, it will reset if both the data and clock lines are held high for longer than 200us. bit 5 - dis_dig_noise - determines whether the digital noise threshold (see section 5.19, "sensor input noise thresh- old register" ) is used by the device. setting this bit disables the feature. 0 - the digital noise threshold is used. if a delta coun t value exceeds the noise threshold but does not exceed the touch threshold, the sample is discarded and not used for the automatic recalibration routine. 1 (default) - the noise threshold is disabled. any delta count that is less than the touch threshold is used for the automatic recalibration routine. bit 4 - dis_ana_noise - determines whether the analog noise filter is enabled. setting th is bit disables the feature. 0 (default) - if low frequency noise is detected by the analog block, the delta count on the corresponding channel is set to 0. note that th is does not require that noise status bits be set. 1 - a touch is not blocked even if low frequency noise is detected. bit 3 - max_dur_en - determines whether the maximum duration recalibration is enabled. 0 (default) - the maximum duration recalibration functi onality is disabled. a touch may be held indefinitely and no recalibration will be performed on any sensor input. 1 - the maximum duration recalibration functionality is enabled. if a touch is hel d for longer than the max_dur bit settings (see section 5.8 ), the recalibration routine will be restarted (see section 4.4.3, "delayed recalibra- tion" ). 5.6.2 configuration 2 - 44h bit 6 - bc_out_recal - controls whether to retry analog calib ration when the base count is out of limit for one or more sensor inputs. 0 - when the bc_outx bit is set for a sensor input, the out of limit base count will be used for the sensor input. 1 (default) - when the bc_outx bit is set for a sensor input (see section 5.16, "base count out of limit regis- ter" ), analog calibration will be repeated on the sensor input. bit 5 - blk_pwr_ctrl - determines whether the device will reduce power consumption while waiting between con- version time completion and t he end of the sensing cycle. 0 (default) - the device will reduce power consumption dur ing the time between the end of the last conversion and the end of t he sensing cycle. 1 - the device will not reduce power consumption during t he time between the end of the last conversion and the end of the sensing cycle. table 5-9: configuration registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 20h r/w configuration time out - dis_ dig_ noise dis_ ana_ noise max_ dur_en - - - 20h 44h r/w configuration 2 - bc_ out_ recal blk_ pwr_ ctrl bc_ out_ int show_ rf_ noise dis_ rf_ noise acal _fail _int int_ rel_ n 40h downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 29 cap1206 bit 4 - bc_out_int - controls the interrupt behavior when the base count is out of limit for one or more sensor inputs. 0 (default) - an interrupt is not generated when the bc_out bit is set (see section 5.2, "status registers" ). 1 - an interrupt is generated when the bc_out bit is set. bit 3 - show_rf_noise - determines whether the noise stat us bits will show rf noise as the only input source. 0 (default) - the noise status registers will show both rf noise and low frequency noise if either is detected on a capacitive touch sensor input. 1 - the noise status registers will only show rf noise if it is detected on a capacitive touch sensor input. low fre- quency noise will still be detected and touches will be blocked normally; however, the status bits will not be updated. bit 2 - dis_rf_noise - determines whether the rf noise filt er is enabled. setting this bit disables the feature. 0 (default) - if rf noise is detected by the analog block, the delta count on the corresponding channel is set to 0. note that this does not require that noise status bits be set. 1 - a touch is not blocked even if rf noise is detected. bit 1 - acal_fail_int - controls the interrupt behavior when analog calibration fails for one or more sensor inputs (see section 4.4, "sensor input calibration" ). 0 (default) - an interrupt is not generated when the acal_fail bit is set (see section 5.2, "status registers" ). 1 - an interrupt is generated when the acal_fail bit is set bit 0 - int_rel_n - controls the interrupt behavior when a release is detected on a button (see section 4.8.2, "capac- itive sensor input interrupt behavior" ). 0 (default) - an interrupt is generated when a press is detected and again when a release is detected and at the repeat rate (if enabled - see section 5.12 ). 1 - an interrupt is generated when a press is detected and at the repeat rate but not when a release is detected. 5.7 sensor input enable register the sensor input enable register determines whether a capaci tive touch sensor input is included in the sensing cycle in the active state. for all bits in this register: 0 - the specified input is not included in the sensing cycle in the active state. 1 (default) - the specified input is inclu ded in the sensing cycle in the active state. bit 5 - cs6_en - determines whether the cs6 i nput is monitored in the active state. bit 4 - cs5_en - determines whether the cs5 i nput is monitored in the active state. bit 3 - cs4_en - determines whether the cs4 i nput is monitored in the active state. bit 2 - cs3_en - determines whether the cs3 i nput is monitored in the active state. bit 1 - cs2_en - determines whether the cs2 i nput is monitored in the active state. bit 0 - cs1_en - determines whether the cs1 i nput is monitored in the active state. table 5-10: sensor input enable register a d d rr / wr e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 21h r/w sensor input enable - - cs6_en cs5_en cs4_en cs3_en cs2_en cs1_en 3fh downloaded from: http:///
cap1206 ds00001567b-page 30 ? 2013-2015 microchip technology inc. 5.8 sensor input configuration register the sensor input configuration regist er controls timings a ssociated with the capa citive sensor inputs. bits 7 - 4 - max_dur[3:0] - (default 1010b) - determines the ma ximum time that a sensor p ad is allowed to be touched until the capacitive touch sens or input is recalibrated (see section 4.4.3, "delayed recalibration" ), as shown in ta b l e 5 - 12 . bits 3 - 0 - rpt_rate[3:0] - (default 0100b) determines the time duration between interrupt assertions when auto repeat is enabled (see section 4.8.2, "capacitive se nsor input interrupt behavior" ). the resolution is 35ms and the range is from 35ms to 560ms as shown in table 5-13 . table 5-11: sensor input configuration register a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 22h r/w sensor input configuration max_dur[3:0] rpt_rate[3:0] a4h table 5-12: max_dur bit decode max_dur[3:0] time before recalibration 32 1 0 0 0 0 0 560ms 0 0 0 1 840ms 0 0 1 0 1120ms 0 0 1 1 1400ms 0 1 0 0 1680ms 0 1 0 1 2240ms 0 1 1 0 2800ms 0 1 1 1 3360ms 1 0 0 0 3920ms 1 0 0 1 4480ms 1 0 1 0 5600ms (default) 1 0 1 1 6720ms 1 1 0 0 7840ms 1 1 0 1 8906ms 1 1 1 0 10080ms 1 1 1 1 11200ms downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 31 cap1206 5.9 sensor input configuration 2 register bits 3 - 0 - m_press[3:0] - (default 0111b) - determines th e minimum amount of time that sensor inputs configured to use auto repeat must detect a sensor pad t ouch to detect a press and hold event (see section 4.8.2, "capacitive sen- sor input interrupt behavior" ). if the sensor input detects a touch for longer than the m_press[3:0] settings, a press and hold event is detected. if a sensor input detects a touch for less than or equal to the m_press[3:0] settings, a touch event is detected. the resolution is 35ms and the range is from 35ms to 560ms as shown in ta b l e 5 - 1 5 . table 5-13: rpt_rate bit decode rpt_rate[3:0] interrupt repeat rate 3210 0000 3 5 m s 0001 7 0 m s 0 0 1 0 105ms 0 0 1 1 140ms 0 1 0 0 175ms (default) 0 1 0 1 210ms 0 1 1 0 245ms 0 1 1 1 280ms 1 0 0 0 315ms 1 0 0 1 350ms 1 0 1 0 385ms 1 0 1 1 420ms 1 1 0 0 455ms 1 1 0 1 490ms 1 1 1 0 525ms 1 1 1 1 560ms table 5-14: sensor input configuration 2 register a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 23h r/w sensor input configuration 2 - - - - m_press[3:0] 07h downloaded from: http:///
cap1206 ds00001567b-page 32 ? 2013-2015 microchip technology inc. 5.10 averaging and sampling configuration register the averaging and sampli ng configuration register contro ls the number of samples tak en and the target sensing cycle time for sensor inputs enabled in the active state. bits 6 - 4 - avg[2:0] - determines the number of samples th at are taken for all channels enabled in the active state during the sensing cycle as shown in table 5-17 . all samples are taken consecutively on the same channel before the next channel is sampled and the result is averaged over the number of samples measured before updating the mea- sured results. for example, if cs1, cs2, and cs3 are sampled during the sensing cycle, and the avg[2:0] bits are set to take 4 sam- ples per channel, then the full sensing cycle will be: cs1, cs1, cs1, cs 1, cs2, cs2, cs2, cs2, cs3, cs3, cs3, cs3. table 5-15: m_press bit decode m_press[3:0] m_press settings 3210 0000 3 5 m s 0001 7 0 m s 0 0 1 0 105ms 0 0 1 1 140ms 0 1 0 0 175ms 0 1 0 1 210ms 0 1 1 0 245ms 0 1 1 1 280ms (default) 1 0 0 0 315ms 1 0 0 1 350ms 1 0 1 0 385ms 1 0 1 1 420ms 1 1 0 0 455ms 1 1 0 1 490ms 1 1 1 0 525ms 1 1 1 1 560ms table 5-16: averaging and sampling configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 24h r/w averaging and sampling config - avg[2:0] samp_time[1:0] cycle_time [1:0] 39h downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 33 cap1206 bits 3 - 2 - samp_time[1:0] - determines the time to take a single sample as shown in table 5-18 . sample time affects the magnitude of the base counts, as shown in table 4-1, "ideal base counts" . bits 1 - 0 - cycle_time[1:0] - determi nes the desired sensing cycle time for channels enabled in the active state, as shown in ta b l e 5 - 1 9 . all enabled channels are sampled at the beginning of the sensing cycle. if additional time is remaining, the device is placed into a lower power state for the remainder of the sensing cycle. table 5-17: avg bit decode avg[2:0] number of samples taken per measurement 210 000 1 001 2 010 4 0 1 1 8 (default) 100 1 6 101 3 2 110 6 4 1 1 1 128 table 5-18: samp_time bit decode samp_time[1:0] sample time 10 0 0 320us 0 1 640us 1 0 1.28ms (default) 1 1 2.56ms table 5-19: cycle_time bit decode cycle_time[1:0] programmed sensing cycle time 10 00 3 5 m s 0 1 70ms (default) 1 0 105ms 1 1 140ms downloaded from: http:///
cap1206 ds00001567b-page 34 ? 2013-2015 microchip technology inc. application note: the programmed sensing cycle time (cycle_time[1:0]) is only ma intained if the actual time to take the samples is less than the programmed cycle time. the avg[2:0] bits will take priority, so the sensing cycle time will be extended as necessary to accommodate the number of samples to be measured. 5.10.1 calibration activate and status register the calibration activate and status register serves a dual function: 1. it forces the selected sensor inputs to be calibr ated, affecting both the analog and di gital blocks (see section 4.4, "sensor input calibration" ). when one or more bits are set, the device performs the calibration routine on the corresponding sensor inputs. when the analog calibratio n routine is finished, the calx[9:0] bits are updated (see section 5.27, "sensor in put calibration registers" ). if the analog calibration ro utine completed successfully for a sensor input, the corresponding bit is automatically cleared. application note: in the case above, bits can be set by host or are automatically set by the device whenever a sensor input is newly enabled (such as comi ng out of deep sleep, after power-on reset, when a bit is set in the sensor enable channel enable register (21h) and the device is in the active state, or when a bit is set in th e standby channel enable register (40h) and the device is in the standby state). 2. it serves as an indicator of an analog calibration failure. if any of the bits could not be cleared, the acal_fail bit is set (see section 5.2, "status registers" ). a bit will fail to clear if a noise bit is set or if the calibration value is at the maximum or minimum value. application note: in the case above, do not check the calibration activate and status bits for failures unless the acal_fail bit is set. in addition, if a se nsor input is newly enabled, do not check the calibration activate and status bits until time has elapsed to complete calibration on the sensor input. otherwise, the acal_fail bit may be set for one sensor input, but the newly enabled sensor input may still be set to 1 in the calibration activate and status, not because it failed, but because it has not been calibrated yet. for all bits in this register: 0 - no action needed. 1 - writing a 1, forces a calibration on the corresponding sensor input. if the acal_fail flag is set and this bit is set (see application note above), the sensor input could not complete analog calibration. bit 5 - cs6_cal - bit for cs6 input. bit 4 - cs5_cal - bit for cs5 input. bit 3 - cs4_cal - bit for cs4 input. bit 2 - cs3_cal - bit for cs3 input. bit 1 - cs2_cal - bit for cs2 input. bit 0 - cs1_cal - bit for cs1 input. application note: writing a 0 to clear a 1 may cause a planned calibration to be skipped, if the calibration routine had not reached the sensor input yet. table 5-20: calibration activate and status register a d d rr / wr e g i s t e rb 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 26h r/w calibration activate and status -- cs6_ cal cs5_ cal cs4_ cal cs3_ cal cs2_ cal cs1_ cal 00h downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 35 cap1206 5.11 interrupt enable register the interrupt enable register determines whether a sensor pad touch or release (if enabled) causes an interrupt (see section 4.8, "interrupts" ). for all bits in this register: 0 - the alert# pin will not be asserted if a t ouch is detected on the specified sensor input. 1 (default) - the alert# pin will be asserted if a touch is detected on the specified sensor input. bit 5 - cs6_int_en - enables the alert# pin to be asserted if a touch is detected on cs6 (associated with the cs6 status bit). bit 4 - cs5_int_en - enables the alert# pin to be asserted if a touch is detected on cs5 (associated with the cs5 status bit). bit 3 - cs4_int_en - enables the alert# pin to be asserted if a touch is detected on cs4 (associated with the cs4 status bit). bit 2 - cs3_int_en - enables the alert# pin to be asserted if a touch is detected on cs3 (associated with the cs3 status bit). bit 1 - cs2_int_en - enables the alert# pin to be asserted if a touch is detected on cs2 (associated with the cs2 status bit). bit 0 - cs1_int_en - enables the alert# pin to be asserted if a touch is detected on cs1 (associated with the cs1 status bit). 5.12 repeat rate enable register the repeat rate enable register enables the repea t rate of the sensor inputs as described in section 4.8.2, "capacitive sensor input interrupt behavior" . for all bits in this register: 0 - the repeat rate for the specified sensor input is disabled. it will only generate an interrupt when a touch is detected and when a release is detected (if enabled) no matter how long the touch is held. 1 (default) - the repeat rate for the specified sensor inpu t is enabled. in the case of a touch event, it will gener- ate an interrupt when a touch is detected and a releas e is detected (as determined by the int_rel_n bit - see section 5.6, "config uration registers" ). in the case of a press and hold event, it will generate an interrupt when a touch is detected and at the repeat rate so long as the touch is held. bit 5 - cs6_rpt_en - enables the repeat rate for capacitive touch sensor input 6. bit 4 - cs5_rpt_en - enables the repeat rate for capacitive touch sensor input 5. bit 3 - cs4_rpt_en - enables the repeat rate for capacitive touch sensor input 4. bit 2 - cs3_rpt_en - enables the repeat rate for capacitive touch sensor input 3. bit 1 - cs2_rpt_en - enables the repeat rate for capacitive touch sensor input 2. table 5-21: interrupt enable register a d d rr / wr e g i s t e rb 7b 6b 5b 4b 3b 2b 1b 0d e f a u l t 27h r/w interrupt enable -- cs6_ int_en cs5_ int_en cs4_ int_en cs3_ int_en cs2_ int_en cs1_ int_en 3fh table 5-22: repeat rate enable register a d d rr / wr e g i s t e rb 7b 6b 5b 4b 3b 2b 1b 0d e f a u l t 28h r/w repeat rate enable -- cs6_ rpt_en cs5_ rpt_en cs4_ rpt_en cs3_ rpt_en cs2_ rpt_en cs1_ rpt_en 3fh downloaded from: http:///
cap1206 ds00001567b-page 36 ? 2013-2015 microchip technology inc. bit 0 - cs1_rpt_en - enables the repeat rate for capacitive touch sensor input 1. 5.13 multiple touch configuration register the multiple touch configurati on register controls the settings for the mult iple touch detection circuitry. these settings determine the number of simultaneous buttons that may be pr essed before additional buttons are blocked and the mult status bit is set. bit 7 - mult_blk_en - enables the multiple button blocking circuitry. 0 - the multiple touch circuitry is disabl ed. the device will not block multiple touches. 1 (default) - the multiple touch circuitry is enabled . the device will flag the number of touches equal to pro- grammed multiple touch threshold and block all others. it will remember which sensor inputs are valid and block all others until that sensor pad has been released. once a sensor pad has been released, the n detected touches (determined via the sensing cycle order of cs1 - cs6) will be flag ged and all othe rs blocked. bits 3 - 2 - b_mult_t[1:0] - determines the number of simult aneous touches on all sensor pads before a multiple touch event is detected and sensor inputs are blocked. the bit decode is given by table 5-24 . 5.14 multiple touch pattern configuration register the multiple touch pattern configuration register controls th e settings for the multiple t ouch pattern detection circuitry. this circuitry works like the multiple touch det ection circuitry with the following differences: 1. the detection threshold is a percentage of the touch detection threshold as defined by the mtp_th[1:0] bits whereas the multiple touch circuitry uses the touch detection threshold. 2. the mtp detection circuitry either will detect a specific pattern of sensor inputs as determined by the multiple table 5-23: multipl e touch configuration addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 2ah r/w multiple touch config mult _blk_ en - - - b_mult_t[1:0] - - 80h table 5-24: b_mult_t bit decode b_mult_t[1:0] number of simultaneous touches 10 0 0 1 (default) 01 2 10 3 11 4 table 5-25: multiple touch pattern configuration addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 2bh r/w multiple touch pattern config mtp_ en - - - mtp_th[1:0] comp_ ptrn mtp_ alert 00h downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 37 cap1206 touch pattern register settings or it will use the multiple touch pattern register settings to determine a minimum number of sensor inputs that will cause the mtp circuitry to flag an event (see section 5.15, "multiple touch pat- tern register" ). when using pattern recognition mode, if all of th e sensor inputs set by the multiple touch pattern register have a delta count greater than the mtp thresh old or have their corresponding noise flag status bits set, the mtp bit will be set. when using the absolute num ber mode, if the number of sensor inputs with thresholds above the mtp threshold or with noise flag status bits se t is equal to or greater t han this number, the mtp bit will be set. 3. when an mtp event occurs, all touches are blocked and an interrupt is generated. 4. all sensor inputs will remain blocked so long as the requ isite number of sensor inpu ts are above the mtp thresh- old or have noise flag status bits set. once this condition is removed, touc h detection will be restored. note that the mtp status bit is only cleared by writing a 0 to the int bit once the condition has been removed. bit 7 - mtp_en - enables the multiple touch pattern detection circuitry. 0 (default) - the mtp detection circuitry is disabled. 1 - the mtp detection circuitry is enabled. bits 3 - 2 - mtp_th[1:0] - determine the mtp threshold, as shown in ta b l e 5 - 2 6 . this threshold is a percentage of sen- sor input threshold (see section 5.18, "sensor input threshold registers" ) for inputs enabled in the active state or of the standby threshold (see section 5.23, "standby threshold register" ) for inputs enabled in the standby state. bit 1 - comp_ptrn - determines whether the mtp detection circ uitry will use the multiple t ouch pattern register as a specific pattern of sensor inputs or as an absolute number of sensor inputs. 0 (default) - the mtp detection circui try will use the multiple touch pattern r egister bit settings as an absolute minimum number of sensor inputs that must be above the th reshold or have noise flag status bits set. the num- ber will be equal to the number of bits set in the register. 1 - the mtp detection circuitry will use pattern recognitio n. each bit set in the multiple touch pattern register indicates a specific sensor input that must have a delta count greater than the mtp threshold or have a noise flag status bit set. if the criteria are met, the mtp status bit will be set. bit 0 - mtp_alert - enables an interrupt if an mtp event oc curs. in either condition, the mtp status bit will be set. 0 (default) - if an mtp event occurs, the alert# pin is not asserted. 1 - if an mtp event occurs, the alert# pin will be asserted. 5.15 multiple touch pattern register table 5-26: mtp_th bit decode mtp_th[1:0] threshold divide setting 100 0 12.5% (default) 012 5 % 103 7 . 5 % 1 1 100% table 5-27: multiple touch pattern register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 2dh r/w multiple touch pattern -- cs6_ ptrn cs5_ ptrn cs4_ ptrn cs3_ ptrn cs2_ ptrn cs1_ ptrn 3fh downloaded from: http:///
cap1206 ds00001567b-page 38 ? 2013-2015 microchip technology inc. the multiple touch pattern register acts as a pattern to i dentify an expected sensor inpu t profile for diagnostics or other significant events. there are two methods for how the multiple touch pattern register is used: as specific sensor inputs or number of sensor input t hat must exceed the mtp threshold or have no ise flag status bits set. which method is used is based on the comp_ptrn bit (see section 5.14 ). the methods are described below. 1. specific sensor inputs: if, during a single sensing cycle, the specific sensor inputs above the mtp threshold or with noise flag status bits set match those bits set in the multiple touch pattern register, an mtp event is flagged. 2. number of sensor inputs: if, during a single sensing cycl e, the number of sensor in puts with a delta count above the mtp threshold or with noise flag status bits set is equ al to or greater than the num ber of pattern bits set, an mtp event is flagged. for all bits in this register: 0 - the specified sensor input is not considered a part of the pattern. 1 - the specified sensor input is c onsidered a part of the pattern, or the absolute number of sensor inputs that must have a delta count greater than t he mtp threshold or have the noise flag status bit set is increased by 1. bit 5 - cs6_ptrn - determines whether cs6 is cons idered as part of the multiple touch pattern. bit 4 - cs5_ptrn - determines whether cs5 is cons idered as part of the multiple touch pattern. bit 3 - cs4_ptrn - determines whether cs4 is cons idered as part of the multiple touch pattern. bit 2 - cs3_ptrn - determines whether cs3 is cons idered as part of the multiple touch pattern. bit 1 - cs2_ptrn - determines whether cs2 is cons idered as part of the multiple touch pattern. bit 0 - cs1_ptrn - determines whether cs1 is cons idered as part of the multiple touch pattern. 5.16 base count out of limit register the base count out of limit register indicates which sensor inputs have base counts out of limit (see section 4.4, "sen- sor input calibration" ). when these bits are set, the bc_out bit is set (see section 5.2, "status registers" ). for all bits in this register: 0 - the base count for the specified s ensor input is in the operating range. 1 - the base count of the specified sens or input is not in the operating range. bit 5 - bc_out_6 - indicates whether cs6 has a base count out of limit. bit 4 - bc_out_5 - indicates whether cs6 has a base count out of limit. bit 3 - bc_out_4 - indicates whether cs6 has a base count out of limit. bit 2 - bc_out_3 - indicates whether cs3 has a base count out of limit. bit 1 - bc_out_2 - indicates whether cs2 has a base count out of limit. bit 0 - bc_out_1 - indicates whether cs1 has a base count out of limit. table 5-28: base count out of limit register a d d rr / wr e g i s t e rb 7b 6b 5b 4b 3b 2b 1b 0d e f a u l t 2eh r base count out of limit -- bc_ out_ 6 bc_ out_ 5 bc_ out_ 4 bc_ out_ 3 bc_ out_ 2 bc_ out_ 1 00h downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 39 cap1206 5.17 recalibration configuration register the recalibration configuration register contro ls some recalibration routine settings (see section 4.4, "sensor input calibration" ) as well as advanced controls to program th e sensor input threshold register settings. bit 7 - but_ld_th - enables setting all sensor input thresh old registers by writing to the sensor input 1 threshold register. 0 - each sensor input x threshold register is updated individually. 1 (default) - writing the sensor input 1 threshold regist er will automatically overwrit e the sensor input threshold registers for all sensor inputs (sensor input threshold 1 through sensor input threshold 6). the individual sensor input x threshold registers (sensor input 2 threshold th rough sensor input 6 threshold) can be individually updated at any time. bit 6 - no_clr_intd - controls whether the accumulation of in termediate data is cleared if the noise status bit is set. 0 (default) - the accumulation of intermediate data is cleared if the noise status bit is set. 1 - the accumulation of intermediate data is not cleared if the noise status bit is set. application note: bits 5 and 6 should both be set to the same value. either both should be set to 0 or both should be set to 1. bit 5 - no_clr_neg - controls whether the consecutive negativ e delta counts counter is cleared if the noise status bit is set. 0 (default) - the consecutive negative delta counts co unter is cleared if the noise status bit is set. 1 - the consecutive negative delta counts counter is not cleared if the noise status bit is set. bits 4 - 3 - neg_delta_cnt[1:0] - determines the number of negative delta counts necessary to trigger a digital reca- libration (see section 4.4.2, "negative delta count recalibration" ), as shown in table 5-30 . bits 2 - 0 - cal_cfg[2:0] - determines the update time and number of samples of the automatic recalibration routine (see section 4.4.1, "aut omatic recalibration" ). the settings apply to all sensor inputs universally (though individual sen- sor inputs can be configured to support recalibration - see section 5.10.1 ). table 5-29: recalibration configuration registers addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 2fh r/w recalibration configuration but_ ld_th no_clr _intd no_clr _neg neg_delta_ cnt[1:0] cal_cfg[2:0] 8ah table 5-30: neg_delta_cnt bit decode neg_delta_cnt[1:0] number of consecutive negative delta count values 10 00 8 0 1 16 (default) 10 3 2 1 1 none (disabled) downloaded from: http:///
cap1206 ds00001567b-page 40 ? 2013-2015 microchip technology inc. note 5-1 recalibration samples refers to the number of samp les that are measured and averaged before the base count is updated however does no t control the base count update period. note 5-2 update time refers to the amount of time (in sensin g cycle periods) that elapses before the base count is updated. the time will depend upon the nu mber of channels enabled, the averaging setting, and the programmed sensing cycle time. 5.18 sensor input threshold registers the sensor input threshold registers store the delta thresh old that is used to determi ne if a touch has been detected. when a touch occurs, the input signal of the corresponding sensor pad changes due to the capacitance associated with a touch. if the sensor input change exceeds the threshold settings, a touch is detected. when the but_ld_th bit is set (see section 5.17 - bit 7), writing data to the sensor input 1 threshold register will update all of the sensor input thresh old registers (31h - 35h inclusive). table 5-31: cal_cfg bit decode cal_cfg[2:0] recalibration samples (see note 5-1 ) update time (see note 5-2 ) 210 0 0 0 16 16 001 3 2 3 2 0 1 0 64 64 (default) 0 1 1 128 128 100 2 5 6 2 5 6 1 0 1 256 1024 1 1 0 256 2048 1 1 1 256 4096 table 5-32: sensor input threshold registers a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 30h r/w sensor input 1 threshold -6 43 21 68421 4 0 h 31h r/w sensor input 2 threshold -6 43 21 68421 4 0 h 32h r/w sensor input 3 threshold -6 43 21 68421 4 0 h 33h r/w sensor input 4 threshold -6 43 21 68421 4 0 h 34h r/w sensor input 5 threshold -6 43 21 68421 4 0 h 35h r/w sensor input 6 threshold -6 43 21 68421 4 0 h downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 41 cap1206 5.19 sensor input noise threshold register the sensor input noise threshold regist er controls the value of a secondary internal threshold to detect noise and improve the automatic recalibration routine. if a capacitive touch sensor input exceeds the sensor input noise threshold but does not exceed the sensor input thre shold, it is determined to be caused by a noise spike. that sample is not used by the automatic recalibration routine. this featur e can be disabled by setting the dis_dig_noise bit. bits 1-0 - cs1_bn_th[1:0] - controls the noise threshold for all capacitive touch sensor inputs, as shown in ta b l e 5 - 3 4 . the threshold is proportional to the threshold setting. 5.20 standby channel register the standby channel register controls which (if any) capa citive touch sensor inputs are enabled in standby (see section 4.3.1.2, "standby state sensing settings" ). for all bits in this register: 0 (default) - the specified channel will not be monitored in standby. 1 - the specified channel will be monitored in standb y. it will use the standby threshold setting, and the standby averaging and sens itivity settings. bit 5 - cs6_stby - controls whether the cs6 channel is enabled in standby. bit 4 - cs5_stby - controls whether the cs5 channel is enabled in standby. bit 3 - cs4_stby - controls whether the cs4 channel is enabled in standby. bit 2 - cs3_stby - controls whether the cs3 channel is enabled in standby. bit 1 - cs2_stby - controls whether the cs2 channel is enabled in standby. bit 0 - cs1_stby - controls whether the cs1 channel is enabled in standby. table 5-33: sensor input noise threshold register a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 38h r/w sensor input noise threshold - - ---- cs_bn_th [1:0] 01h table 5-34: csx_bn_th bit decode cs_bn_th[1:0] percent threshold setting 10 002 5 % 0 1 37.5% (default) 105 0 % 116 2 . 5 % table 5-35: standby channel register a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 40h r/w standby channel -- cs6_ stby cs5_ stby cs4_ stby cs3_ stby cs2_ stby cs1_ stby 00h downloaded from: http:///
cap1206 ds00001567b-page 42 ? 2013-2015 microchip technology inc. 5.21 standby configuration register the standby configuration register contro ls averaging and sensing cycle time for sensor inputs enabled in standby. this register allows the user to c hange averaging and sample times on a limited number of sensor inputs in standby and still maintain normal functionality in the active state. bit 7 - avg_sum - determines whether the sensor inputs enabled in standby will average the programmed number of samples or whether they will accumulate for the programmed number of samples. 0 - (default) - the standby enabled sensor input de lta count values will be base d on the average of the pro- grammed number of samples when compared against the threshold. 1 - the standby enabled sensor input delta count va lues will be based on the summation of the programmed number of samples when compared against the threshold. caution should be used wit h this setting as a touch may overflow the delta count registers and may result in false readings. bits 6 - 4 - stby_avg[2: 0] - determines the number of samples that ar e taken for all standby enabled channels during the sensing cycle as shown in ta b l e 5 - 3 7 . all samples are taken consecutively on the same channel before the next channel is sampled and the result is averaged over the number of samples measured before updating the measured results. bit 3 - 2 - stby_samp_time[1:0] - determines the time to take a si ngle sample for sensor inputs enabled in standby as shown in ta b l e 5 - 3 8 . table 5-36: standby configuration register addr r/w register b7 b6 b5 b4 b3 b2 b1 b0 default 41h r/w standby configuration avg_ sum stby_avg[2:0] stby_samp_ time[1:0] stby_cy_time [1:0] 39h table 5-37: stby_avg bit decode stby_avg[2:0] number of samples taken per measurement 210 000 1 001 2 010 4 0 1 1 8 (default) 100 1 6 101 3 2 110 6 4 1 1 1 128 downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 43 cap1206 bits 1 - 0 - stby_cy_time[2:0] - determines the desired sensing cycle time for sensor inputs enabled during standby, as shown in table 5-39 . all enabled channels are sampled at the beginning of the sensing cycle. if additional time is remaining, the device is placed into a lower power state for the remainder of the sensing cycle. application note: the programmed sensing cycle time (stdby_cy_ti me[1:0] is only maintained if the actual time to take the samples is less than t he programmed cycle time. the stby_avg[2:0] bits will take priority, so the sensing cycle time will be extended as nece ssary to accommodate the number of samples to be measured. 5.22 standby sensitivity register the standby sensitivity register controls the sensitivity for sensor inputs enabled in standby. bits 2 - 0 - stby_sense[2:0] - controls the sensitivity for sensor inputs that are enabled in standby. the sensitivity settings act to scale the relative delta count value higher or lower based on the system parameters. a setting of 000b is the most sensitive while a setting of 111b is the least sensit ive. at the more sensitive se ttings, touches are detected for a smaller delta capacitance corresponding to a lighter touch. these settings are more sensitive to noise, however, and a noisy environment may flag more false touches than higher sensitivity levels. table 5-38: stby_samp_time bit decode stby_samp_time[1:0] sampling time 10 0 0 320us 0 1 640us 1 0 1.28ms (default) 1 1 2.56ms table 5-39: stby_cy_time bit decode stby_cy_time[1:0] programmed sensing cycle time 10 00 3 5 m s 0 1 70ms (default) 1 0 105ms 1 1 140ms table 5-40: standby sensitivity register a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 42h r/w standby sensitivity - - - - - stby_sense[2:0] 02h downloaded from: http:///
cap1206 ds00001567b-page 44 ? 2013-2015 microchip technology inc. application note: a value of 128x is the most sens itive setting available. at the most sensitivity settings, the msb of the delta count register represents 64 out of ~25,000 which corresponds to a touch of approximately 0.25% of the base capacitance (or a ? c of 25ff from a 10pf base capacitance). conversely a val ue of 1x is the least sensitiv e setting available. at these settings, the msb of the delta count register corresponds to a delta count of 8192 counts out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance (or a ? c of 3.33pf from a 10pf base capacitance). 5.23 standby threshold register the standby threshold register stores t he delta threshold that is used to dete rmine if a touch ha s been detected. when a touch occurs, the input signal of the corresponding sens or pad changes due to the capacitance associated with a touch. if the sensor input change exceeds the threshold settings, a touch is detected. 5.24 sensor input base count registers table 5-41: stby_sense bit decode stby_sense[2:0] sensitivity multiplier 210 0 0 0 128x (most sensitive) 001 6 4 x 0 1 0 32x (default) 011 1 6 x 100 8 x 101 4 x 110 2 x 1 1 1 1x - (least sensitive) table 5-42: standby threshold register a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 43h r/w standby threshold -6 43 21 68421 4 0 h table 5-43: sensor input base count registers a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t 50h r sensor input 1 base count 128 64 32 16 8 4 2 1 c8h 51h r sensor input 2 base count 128 64 32 16 8 4 2 1 c8h downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 45 cap1206 the sensor input base count registers store the calibrated not touched input value from the capacitive touch sensor inputs. these registers are periodically updated by the calibration and recalibration routines. the routine uses an internal adder to add the current count value for each reading to the sum of the previous readings until sample size has been reached. at this point, the uppe r 16 bits are taken and used as the sensor input base count. the internal adder is then reset and the recalibration routine continues. the data presented is determined by the base_shift[3:0] bits (see section 5.5 ). 5.25 power button register the power button register indicates the sensor input that has been designated as the power button (see section 4.5, "power button" ). bits 2 - 0 - pwr_btn[2:0] - when the pow er button feature is enabled, this control indicates the sensor input to be used as the power button. the decode is shown in table 5-45 . 52h r sensor input 3 base count 128 64 32 16 8 4 2 1 c8h 53h r sensor input 4 base count 128 64 32 16 8 4 2 1 c8h 54h r sensor input 5 base count 128 64 32 16 8 4 2 1 c8h 55h r sensor input 6 base count 128 64 32 16 8 4 2 1 c8h table 5-44: power button register a d d rr / w r e g i s t e r b 7b 6b 5b 4b 3b 2b 1b 0d e f a u l t 60h r/w power button - - - - - pwr_btn[2:0] 00h table 5-45: pwr_btn bit decode pwr_btn[2:0] sensor input designated as power button 210 000 c s 1 001 c s 2 010 c s 3 011 c s 4 100 c s 5 101 c s 6 table 5-43: sensor input base co unt registers (continued) a d d rr / w r e g i s t e r b 7 b 6 b 5b 4b 3b 2b 1b 0d e f a u l t downloaded from: http:///
cap1206 ds00001567b-page 46 ? 2013-2015 microchip technology inc. 5.26 power button configuration register the power button configuration register controls the length of time that the designated power button must indicate a touch before an interrupt is generated and the power status indicator is set (see section 4.5, "power button" ). bit 6 - stby_pwr_en - enables the power button feature in the standby state. 0 (default) - the standby power button circuitry is disabled. 1 - the standby power button circuitry is enabled. bits 5 - 4 - stby_pwr_time [1:0] - determines the overall time, as shown in ta b l e 5 - 4 7 , that the power button must be held in the standby state, in order for an interrupt to be generated and the pwr bit to be set. bit 2 - pwr_en - enables the power button feature in the active state. 0 (default) - the power button circ uitry is disabled in the active state. 1 -the power button circuitry is enabled in the active state. bits 1 - 0 - pwr_time[1:0] - determines the overall time, as shown in ta b l e 5 - 4 7 , that the power button must be held in the active state, in order for an interr upt to be generated and the pwr bit to be set. 5.27 sensor input calibration registers table 5-46: power button configuration register a d d rr / wr e g i s t e r b 7 b 6 b 5b 4b 3 b 2 b 1 b 0d e f a u l t 61h r/w power button configuration - stby_ pwr_ en stby_pwr_ time [1:0] - pwr_ en pwr_time [1:0] 22h table 5-47: power button time bits decode pwr_time[1:0] / stby_pwr_time[1:0] power button touch hold time 10 0 0 280ms 0 1 560ms 1 0 1.12 sec (default) 1 1 2.24 sec table 5-48: sensor input calibration registers addr register r/w b7 b6 b5 b4 b3 b2 b1 b0 default b1h sensor input 1 calibration r cal1_9 cal1_8 cal1_7 cal1_6 cal1_5 cal1_4 cal1_3 cal1_2 00h b2h sensor input 2 calibration r cal2_9 cal2_8 cal2_7 cal2_6 cal2_5 cal2_4 cal2_3 cal2_2 00h b3h sensor input 3 calibration r cal3_9 cal3_8 cal3_7 cal3_6 cal3_5 cal3_4 cal3_3 cal3_2 00h b4h sensor input 4 calibration r cal4_9 cal4_8 cal4_7 cal4_6 cal4_5 cal4_4 cal4_3 cal4_2 00h downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 47 cap1206 the sensor input calibration registers hold the 10-bit value that represents the last cali bration value. the value rep- resents the capacitance applied to the internal sensing circui ts to balance the capacitance of the sensor input pad. min- imum (000h) and maximum (3ffh) values indicate analog calibration failure (see section 4.4, "sensor input calibration" ). 5.28 product id register the product id register stores a unique 8-bit value that identifies the device. 5.29 manufacturer id register the vendor id register stores an 8-bit value that represents mchp. 5.30 revision register the revision register stores an 8-bit va lue that represents the part revision. b5h sensor input 5 calibration r cal5_9 cal5_8 cal5_7 cal5_6 cal5_5 cal5_4 cal5_3 cal5_2 00h b6h sensor input 6 calibration r cal6_9 cal6_8 cal6_7 cal6_6 cal6_5 cal6_4 cal6_3 cal6_2 00h b9h sensor input calibration lsb 1 r cal4_1 cal4_0 cal3_1 cal3_0 cal2_1 cal2_0 cal1_1 cal1_0 00h bah sensor input calibration lsb 2 r ---- cal6_1 cal6_0 cal5_1 cal5_0 00h table 5-49: product id register a d d rr / w r e g i s t e r b 7b 6b 5b 4b 3b 2b 1b 0d e f a u l t fdh r product id cap1206-1 01100111 6 7 h table 5-50: vendor id register a d d rr / w r e g i s t e r b 7b 6b 5b 4b 3b 2b 1b 0d e f a u l t f e hrm a n u f a c t u r e r i d01011101 5 d h table 5-51: revision register a d d rr / w r e g i s t e r b 7b 6b 5b 4b 3b 2b 1b 0d e f a u l t f f hr r e v i s i o n 00000000 0 0 h table 5-48: sensor input cali bration registers (continued) addr register r/w b7 b6 b5 b4 b3 b2 b1 b0 default downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 48 cap1206 6.0 package information 6.1 cap1206 package drawings figure 6-1: cap1206 package drawing - 10-pin dfn 3mm x 3mm downloaded from: http:///
cap1206 ds00001567b-page 49 ? 2013-2015 microchip technology inc. figure 6-2: cap1206 package dimens ions - 10-pin dfn 3mm x 3mm figure 6-3: cap1206 pcb land pattern and stencil - 10-pin dfn 3mm x 3mm downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 50 cap1206 figure 6-4: cap1206 pcb detail a - 10-pin dfn 3mm x 3mm downloaded from: http:///
cap1206 ds00001567b-page 51 ? 2013-2015 microchip technology inc. figure 6-5: cap1206 pcb detail b - 10-pin dfn 3mm x 3mm downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 52 cap1206 figure 6-6: cap1206 land dime nsions - 10-pin dfn 3mm x 3mm downloaded from: http:///
cap1206 ds00001567b-page 53 ? 2013-2015 microchip technology inc. figure 6-7: cap1206 14-lead plastic small outline, narrow, 3.90 mm body (soic) note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 54 cap1206 figure 6-7: cap1206 14-lead plastic small outline, narrow, 3.90 mm body (soic) note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
cap1206 ds00001567b-page 55 ? 2013-2015 microchip technology inc. figure 6-7: cap1206 14-lead plastic small outline, narrow, 3.90 mm body (soic)

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? 2013-2015 microchip technology inc. ds00001567b-page 56 cap1206 figure 6-8: cap1206 package marking 2 7 w w n n n a pin 1 cap1206-1-sl-tr cap1206-2-sl-tr cap1206-1-aia-tr CAP1206-2-AIA-TR 2 7w nnna e4 top bottom bottom marking not allowed pb-free/green symbol (ni/pd pp-lf) pin 1 2x 0.6 line 1 C device code, week line 2 C alphanumeric traceability code w lines 1-2: line 3: center horizontal alignment as shown h 1w nnna e4 top bottom bottom marking not allowed pb-free/green symbol (ni/pd pp-lf) pin 1 2x 0.6 line 1 C device code, week line 2 C alphanumeric traceability code w lines 1-2: line 3: center horizontal alignment as shown line 1 C device code, week line 2 C alphanumeric traceability code line 1 C device code, week line 2 C alphanumeric traceability code h 1 w w n n n a pin 1 pb-free jedec designator for matte tin (sn) pb-free jedec designator for matte tin (sn) downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 57 cap1206 appendix a: device delta a.1 delta from cap1106 to cap1206 the cap1206 is pin- and register-compatible with the cap1106, with the exc eption of the gain[1:0] bits and alt_pol bit. 1. revision id set to 00h. 2. added power button feature (see section 4.5, "power button" ). 3. added acal_fail bit to flag analog calibration failures (see section 5.2, "status registers" ) and acal_fail_int bit to control analog calibration failure interrupts (see section 5.6, "configuration registers" ). 4. added bc_out bit to flag calibration fa ilures regarding base counts out of limit (see section 5.2, "status registers" ) and bc_out_recal and bc_out_int bit to control base count out of limit behavior and interrupts (see section 5.6, "configuration registers" ). added base count out of limit register to indicate which sensor inpu ts have base counts outside the operating range (see section 5.16, "base count out of limit register" ). 5. increased supply voltage range for 5v operation. 6. increased operating temperature range from 0c - 85c to -40c to 125c. 7. removed proximity detection gain (gain[1:0] bits). 8. removed alert pin configuration (alt_pol bit). 9. register additions are shown in table a-1, "register delta" . table a-1: register delta address register delta delta default 00h page 24 removed bits - main control register removed gain[1:0] bits. 00h 02h page 24 added bits - general status register added bit 4 pwr for new power button feature. added bit 5 acal_fail to indicate analog calibration failure. added bit 6 bc_out. 00h 26h page 34 renamed calibration activate and status register and added functionality in addition to forcing a calibration, the register also indicates the status of calibration for each sensor input. 00h 2eh page 38 new - base count out of limit register new register for calibration status 00h 44h page 28 added and removed bits - configuration 2 register added bit 1 acal_fail_int. added bit 4 bc_out_int. changed bit 6 from alt_pol to bc_out_recal. 40h 60h page 45 new - power button register new register for power button feature 00h 61h page 46 new - power button configuration register new register for configuring the power button feature 00h downloaded from: http:///
cap1206 ds00001567b-page 58 ? 2013-2015 microchip technology inc. fdh page 47 changed - product id new product id for cap1206 67h ffh page 47 changed - revision register revision changed. 00h table a-1: register delta (continued) address register delta delta default downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 59 cap1206 7.0 revision history table 7-1: revision history revision level and date section/figure/entry correction ds00001567b (11-17-15) added 14-lead soic packages, soic pinout diagrams, package marking. updated ordering information. cap1206 revision a replaces the previous smsc version revision 1.0 downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 60 cap1206 the microchip web site microchip provides online support via our www site at www.microchip.com . this web site is used as a means to make files and information easily available to customers. accessible by using your favorite internet browser, the web site con- tains the following information: product support C data sheets and errata, application notes and sample programs, design resources, users guides and hardware support documents, latest software releases and archived software general technical support C frequently asked questions (faq), te chnical support requests, online discussion groups, microchip consultant program member listing business of microchip C product selector and ordering guides, latest microchip press releases, listing of semi- nars and events, listings of microchip sales offi ces, distributors and factory representatives customer change notification service microchips customer notification service helps keep customers current on microc hip products. subscribers will receive e-mail notification whenever there are changes, updates, revisi ons or errata related to a specified product family or development tool of interest. to register, access the microchip web site at www.microchip.com . under support, click on customer change notifi- cation and follow the registration instructions. customer support users of microchip products can receive assistance through several channels: distributor or representative local sales office field application engineer (fae) technical support customers should contact their distributor, representative or field application engineer (fae) for support. local sales offices are also available to help customers. a listing of sales offices and locations is included in the back of this docu- ment. technical support is available through the web site at: http://www.microchip.com/support downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 61 cap1206 product identification system to order or obtain information, e.g., on pricing or de livery, refer to the factory or the listed sales office . device: cap1206 tape and reel option tr tape and reel package: (2) aia 10-pin dfn sl 14-pin soic examples: a) cap1206-1-aia-tr 0b0101_000[r/w] address 10-pin dfn package b) cap1206-2-sl-tr 0b0101_001[r/w] address 14-pin soic package note 1: tape and reel identifier only appears in the catalog part number description. this iden- tifier is used for ordering purposes and is not printed on the device package. check with your microchip sales office for pack- age availability with the tape and reel option. 2: for other small form-factor package avail- ability and marking information, please visit www.microchip.com/packaging or contact your local sales office. part no. [x] xx package address option device [xx] tape and reel option - - downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 62 cap1206 information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with yo ur specifications. microchip make s no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition , quality, performance, merchantability or fi tness for purpose . microchip disclaims all liabilit y arising from this information and its use. use of micro- chip devices in life support and/or safety applications is entirely at the buyer s risk, and the buyer agrees to defend, indemn ify and hold harmless microchip from any and all damages, claims, suits, or ex penses resulting from such use. no licenses are conveyed, impl icitly or otherwise, under any microchip intellectual property rights unless otherwise stated. trademarks the microchip name and logo, the microchip logo , dspic, flashflex, flexpwr, jukeblox, k ee l oq , k ee l oq logo, kleer, lancheck, medialb, most, most logo, mplab, optolyzer, pic, picstart, pic 32 logo, righttouch, spynic, sst, sst logo, superflash and uni/o are registered trademarks of microchip technolog y incorporated in the u.s.a. and other countries. the embedded control solutions company and mtouch are registered tr ademarks of microchip technology incorporated in the u.s.a. analog-for-the-digital age, bodycom, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, ecan, in-circuit serial programming, icsp, inter-chip connectivity, kleernet, kleernet logo, miwi, mpasm, mpf, mplab certified logo, mplib, mplink, multitrak, netdetach, omniscient code generation, picdem, picdem .net, pickit, pictail, righttouch logo, real ice, sqi, serial quad i/o, total endurance, tsharc, usbcheck, varisense, viewspan, wiperlock, wireless dna, and zena are trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of microchi p technology incorporated in the u.s.a. silicon storage technology is a registered trademark of microchip technology inc. in other countries. gestic is a registered trademark of microchi p technology germany ii gmbh & co. kg, a s ubsidiary of microchip technology inc., i n other countries. all other trademarks mentioned herein are property of their respective companies. ? 2013-2015, microchip technology incorporated, pr inted in the u.s.a., all rights reserved. isbn: 9781632779953 note the following details of the code protection feature on microchip devices: microchip products meet the specification cont ained in their particular microchip data sheet. microchip believes that its family of products is one of the mo st secure families of its kind on the market today, when used i n the intended manner and under normal conditions. there are dishonest and possibly illegal meth ods used to breach the code protection fe ature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specif ications contained in microchips data sheets. most likely, the person doing so is engaged in theft of intellectual property. microchip is willing to work with the customer who is concerned about the integrity of their code. neither microchip nor any other semiconductor manufacturer can guarantee the securi ty of their code. code protection does not mean that we are guaranteeing the product as unbreakable. code protection is constantly evolving. we at microchip are committed to continuously improving the code protection features of our products. attempts to break microchips code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your softwa re or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the companys quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperi pherals, nonvolatile memory and analog products. in addition, microchips quality system for the design and manufacture of development systems is iso 9001:2000 certified. quality management s ystem certified by dnv == iso/ts 16949 == downloaded from: http:///
? 2013-2015 microchip technology inc. ds00001567b-page 63 americas corporate office 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7200 fax: 480-792-7277 technical support: http://www.microchip.com/ support web address: www.microchip.com atlanta duluth, ga tel: 678-957-9614 fax: 678-957-1455 austin, tx tel: 512-257-3370 boston westborough, ma tel: 774-760-0087 fax: 774-760-0088 chicago itasca, il tel: 630-285-0071 fax: 630-285-0075 cleveland independence, oh tel: 216-447-0464 fax: 216-447-0643 dallas addison, tx tel: 972-818-7423 fax: 972-818-2924 detroit novi, mi tel: 248-848-4000 houston, tx tel: 281-894-5983 indianapolis noblesville, in tel: 317-773-8323 fax: 317-773-5453 los angeles mission viejo, ca tel: 949-462-9523 fax: 949-462-9608 new york, ny tel: 631-435-6000 san jose, ca tel: 408-735-9110 canada - toronto tel: 905-673-0699 fax: 905-673-6509 asia/pacific asia pacific office suites 3707-14, 37th floor tower 6, the gateway harbour city, kowloon hong kong tel: 852-2943-5100 fax: 852-2401-3431 australia - sydney tel: 61-2-9868-6733 fax: 61-2-9868-6755 china - beijing tel: 86-10-8569-7000 fax: 86-10-8528-2104 china - chengdu tel: 86-28-8665-5511 fax: 86-28-8665-7889 china - chongqing tel: 86-23-8980-9588 fax: 86-23-8980-9500 china - dongguan tel: 86-769-8702-9880 china - hangzhou tel: 86-571-8792-8115 fax: 86-571-8792-8116 china - hong kong sar tel: 852-2943-5100 fax: 852-2401-3431 china - nanjing tel: 86-25-8473-2460 fax: 86-25-8473-2470 china - qingdao tel: 86-532-8502-7355 fax: 86-532-8502-7205 china - shanghai tel: 86-21-5407-5533 fax: 86-21-5407-5066 china - shenyang tel: 86-24-2334-2829 fax: 86-24-2334-2393 china - shenzhen tel: 86-755-8864-2200 fax: 86-755-8203-1760 china - wuhan tel: 86-27-5980-5300 fax: 86-27-5980-5118 china - xian tel: 86-29-8833-7252 fax: 86-29-8833-7256 asia/pacific china - xiamen tel: 86-592-2388138 fax: 86-592-2388130 china - zhuhai tel: 86-756-3210040 fax: 86-756-3210049 india - bangalore tel: 91-80-3090-4444 fax: 91-80-3090-4123 india - new delhi tel: 91-11-4160-8631 fax: 91-11-4160-8632 india - pune tel: 91-20-3019-1500 japan - osaka tel: 81-6-6152-7160 fax: 81-6-6152-9310 japan - tokyo tel: 81-3-6880- 3770 fax: 81-3-6880-3771 korea - daegu tel: 82-53-744-4301 fax: 82-53-744-4302 korea - seoul tel: 82-2-554-7200 fax: 82-2-558-5932 or 82-2-558-5934 malaysia - kuala lumpur tel: 60-3-6201-9857 fax: 60-3-6201-9859 malaysia - penang tel: 60-4-227-8870 fax: 60-4-227-4068 philippines - manila tel: 63-2-634-9065 fax: 63-2-634-9069 singapore tel: 65-6334-8870 fax: 65-6334-8850 taiwan - hsin chu tel: 886-3-5778-366 fax: 886-3-5770-955 taiwan - kaohsiung tel: 886-7-213-7828 taiwan - taipei tel: 886-2-2508-8600 fax: 886-2-2508-0102 thailand - bangkok tel: 66-2-694-1351 fax: 66-2-694-1350 europe austria - wels tel: 43-7242-2244-39 fax: 43-7242-2244-393 denmark - copenhagen tel: 45-4450-2828 fax: 45-4485-2829 france - paris tel: 33-1-69-53-63-20 fax: 33-1-69-30-90-79 germany - dusseldorf tel: 49-2129-3766400 germany - karlsruhe tel: 49-721-625370 germany - munich tel: 49-89-627-144-0 fax: 49-89-627-144-44 italy - milan tel: 39-0331-742611 fax: 39-0331-466781 italy - venice tel: 39-049-7625286 netherlands - drunen tel: 31-416-690399 fax: 31-416-690340 poland - warsaw tel: 48-22-3325737 spain - madrid tel: 34-91-708-08-90 fax: 34-91-708-08-91 sweden - stockholm tel: 46-8-5090-4654 uk - wokingham tel: 44-118-921-5800 fax: 44-118-921-5820 worldwide sales and service 07/14/15 downloaded from: http:///

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