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acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 1 advanced communications & sensing datasheet precision diode digital temperature for up to 3 external sensors v general description the sx8733, sx8743 and sx8744 are digital temperatu re sensors with a 2-wire smbus interface. it provides a low- cost solution to monitor the temperature of remote diodes as well as its own temperature with an on-chip pn j unction sensor. depending on the device version, 2, 3 or 4 programm able ports are included. they offer the possibility to t rig under- / over- temperature alarms which can be used as an in terrupt or to connect up to 3 external sensors in single-en ded mode or 2 external sensors in differential mode. the parasitic resistances in series with the temper ature monitoring diode can be cancelled by an algorithmic , a 3- point or a kelvin (4-wire) method. the sx8744 is pin-to-pin compatible with the lm86 p art. the sx8733 (2 programmable ports) is available in m lpd- 6 package. the sx8743 (4 programmable ports) and sx8744 (3 programmable ports) are available in msop -8 package. applications printer server set top box projector batteries charger monitoring key product features 1 internal and up to 3 external sensors remote diode temp. accuracy of 0.5 c on the temp. range 25 c to 100 c 2 temp. output formats: 0 c to 127 c and -40 c to 140 c with 0.125 c resolution parasitic series resistance cancellation: algorithm ic, 3- point and kelvin (4-wire) under-/ over- temp. alarms with programmable thresholds programmable conversion rate for optimal power consumption 250 ua active current @ 10hz sampling rate smbus v2.0 interface supports timeout pb-free, halogen free, rohs/weee compliant product ordering information part number feature package SX8733EWLTRT 2 programmable ports mlpd-6 sx8743emstrt 4 programmable ports msop-8 sx8744emstrt 3 programmable ports msop-8 p1 vss smbdat p2 vdd smbclk sx8733 vdd p3 p2 p1 smbclk smbdat p4 vss sx8743 vdd p1 p2 nc smbclk smbdat p4 vss sx8744 alarm smbus + + + - - - - adc d1+ al2 al1 mux + d1- d2+ d2- d3+ d3- alarm smbus + + - - - adc d1+ al2 al1 mux + d1- d2+ d2- alarm smbus + + -- - adc d1+ al2 al1 mux + d1- d2+ d2- 12 3 4 5 6 12 3 4 5 6 7 8 1 23 4 5 6 7 8
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 2 section page advanced communications & sensing datasheet table of contents 1. electrical characteristics ..................... ................................................... ................................................... .............. 3 1.1. sensor temperature definition ................ ................................................... ................................................... .. 3 1.2. absolute maximum ratings ..................... ................................................... ................................................... .. 3 1.3. electrical specification ..................... ................................................... ................................................... .......... 4 1.4. smbus timing characteristics................. ................................................... ................................................... .. 5 1.5. smbus timing waveforms ....................... ................................................... ................................................... . 5 2. pin configuration .............................. ................................................... ................................................... ................. 6 2.1. pinout....................................... ................................................... ................................................... .................. 6 2.2. pin description.............................. ................................................... ................................................... ............. 6 3. configuration .................................. ................................................... ................................................... ................... 7 3.1. general presentation ......................... ................................................... ................................................... ........ 7 3.2. modes ........................................ ................................................... ................................................... ................ 7 3.3. differential and single-ended external sensor ................................................... ........................................... 10 3.4. measurement principle ........................ ................................................... ................................................... .... 10 3.5. parasitic track resistance cancellation...... ................................................... ............................................... 10 3.5.1. algorithmic track resistance cancellation. ................................................... ........................................ 10 3.5.2. 3-point track resistance cancellation ...... ................................................... .......................................... 10 3.5.3. the kelvin (4-wire) track resistance cancel lation ............................................. ................................... 11 3.6. temperature acquisition sequence............. ................................................... ............................................... 11 3.7. alarm........................................ ................................................... ................................................... ................ 12 3.8. temperature data format ...................... ................................................... ................................................... . 12 3.9. continuous time vs. single shot .............. ................................................... ................................................. 1 3 4. application note ............................... ................................................... ................................................... ............... 13 4.1. typical temperature sensing system with a sx8 743................................................ .................................. 13 5. power-up sequence and standby mode ............. ................................................... .............................................. 14 6. serial interface ............................... ................................................... ................................................... ................. 14 6.1. register write - combined format ............. ................................................... ................................................ 14 6.2. register write - direct format ............... ................................................... ................................................... .. 14 6.3. register read - combined format .............. ................................................... ............................................... 15 6.4. register read - direct format ................ ................................................... ................................................... . 15 6.5. soft reset ................................... ................................................... ................................................... ............. 15 7. register / memory map .......................... ................................................... ................................................... ......... 16 7.1. memory map ................................... ................................................... ................................................... ......... 16 7.2. registers description........................ ................................................... ................................................... ....... 16 8. packaging information .......................... ................................................... ................................................... ........... 20 8.1. mlpd-w6-ep2 package outline drawing.......... ................................................... ........................................ 20 8.2. mlpd-w6-ep2 land pattern drawing............. ................................................... ........................................... 21 8.3. package outline drawing: msop-8.............. ................................................... .............................................. 22 8.4. land pattern drawing: msop-8 ................. ................................................... ................................................ 23
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 3 digital temperature sensor advanced communications & sensing datasheet 1. electrical characteristics 1.1. sensor temperature definition 1.2. absolute maximum ratings stresses above the values listed below may cause pe rmanent device failure. exposure to absolute maximu m ratings for extended periods may affect device reliability. ope ration outside the parameters specified in the elec trical characteristics section is not implied. parameter symbol local sensor diode temperature (chip junction tempe rature) t j external diode temperature (remote diode junction t emperature) t d parameter symbol conditions min max unit power supply to vss v dd,absmax -0.5 5.75 v storage temperature t j,store -50 150 c ambient operating temperature t j,absmax -40 140 c input voltage on programmable pin v pin,absmax p1, p2, p3, p4 -0.5 v dd + 0.25 v input voltage on smbus pin v pin,smbus smbclk, smbdat -0.5 5.75 v input current on any pin i pin,absmax -10 10 ma peak reflow temperature t pkg 260 c latchup i lup -100 100 ma esd hbm human body model 2 kv mm machine model 200 v cdm charged device model 500 v
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 4 digital temperature sensor advanced communications & sensing datasheet 1.3. electrical specification all values valid within the operating conditions un less otherwise specified. parameter symbol conditions min typ max unit operating conditions power supply v dd 2.7 3.3 5.5 v operating temperature t j operating temperature = junction temperature -40 125 c current consumption active current i vdd,active 10 hz sampling rate no track cancellation mode 250 400 ua current in standby mode i vdd,stdby 10 40 ua temperature to digital converter temperature resolution t resol 0.125 c remote temperature error 1 1. specification with vdd=3.0v to 3.6v and track res istance cancellation disabled. t d,err1 t j = 25c to 85c t d = 25c to 100c -1.5 0.5 1.5 c t d,err2 t j = 25c to 85c t d = - 40c to 125c -3 1.5 3 c local temperature error 1 t j,err1 t j = 25c to 85c -2 0.75 2 c t j,err2 t j = - 40c to 125c 1.5 c conversion time t conv 10hz sampling rate 100 ms remote-diode source current i 2 high level 100 ua i 1 low level 10 ua alarm output low voltage v ol,al i ol < 4ma 0.4 v leakage current i d,leak standby mode -1 1 ua smbus - compatible interface smbclk & smbdat input logic high v ih 2.1 v input logic low v il 0.8 v output logic low v ol i ol < 4ma 0.4 v current leakage on smbclk/ smbdat i leak,smb -1 1 ua capacitive load on smbclk/ smbdat c bus 5 pf
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 5 digital temperature sensor advanced communications & sensing datasheet 1.4. smbus timing characteristics 1.5. smbus timing waveforms figure 1. smbus timing parameter symbol conditions min typ max unit smbus clock frequency f smb 10 400 khz smbus clock low time t low 1.3 us smbus clock high time t high 0.6 us smbus rise time t r,smb 300 ns smbus fall time t f,smb 300 ns smbdat and smbclk time low for reset of serial interface t timeout 25 35 ms data setup time t su,dat 100 ns data hold time 1 1. the device provides a hold time of at least 300ns for the smbdat signal to bridge the undefined regi on of the falling edge of smbclk. t hd,dat 0 ns start condition hold time (smbdat low to smbclk low) t hd,sta 0.6 us stop condition hold time (smbclk high to smbdat high) t su,sto 0.6 us repeated start-condition setup time (smbclk high to smbdat low) t su,sta 0.6 us smbus free time between stop and start conditions t buf 1.3 us smbdat smbclk t low t high t hd,dat t su,dat start stop t buf t su,sta t hd,sta t su,sto
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 6 digital temperature sensor advanced communications & sensing datasheet 2. pin configuration 2.1. pinout table 1 pinout 2.2. pin description table 2 power and smbus pin description table 3 programmable pin description pin # sx8733 1 1. mlpd exposed pad is not connected internally. it is connected to ground plane for thermal dissipation sx8743 sx8744 1 p1 vdd vdd 2 vss p3 p1 3 smbdat p2 p2 4 smbclk p1 nc 5 vdd vss vss 6 p2 p4 p4 7 - smbdat smbdat 8 - smbclk smbclk pin type description smbclk digital smbus serial clock input, open drain smbdat digital smbus serial data input/output, open d rain vdd power positive power supply vss power negative power supply pin type description mode 01 2 3 45 67 89 10 11 12 13 14 15 16 17 18 20 p1 analog ext. diode current source d1+ d1+ d1+ d1+ d1+ d1+ d 1+ d1+ d1+ d1+ d1+ d1+ digital alarm output, pseudo-open drain al1 p2 analog ext. diode current source d2+ d2+ d2+ d2+ analog ext. diode return current sink d1- d1- d1- d1- d1 - d1- digital alarm output, pseudo-open drain al2 al1 p3 analog ext. diode current source d2+ d2+ d3+ d3+ d1+ analog ext. diode return current sink d1- d2- digital alarm output, pseudo-open drain al1 al1 p4 analog ext. diode return current sink d2- d1- digital alarm output, pseudo-open drain al2 al2 al1 al1 d1- d2- d3- vss power ext. diode return current sink d1- d1- d2- d1- d1- d1- d2- d1- d2- d1- d2- d3- d1- d2- d3-
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 7 digital temperature sensor advanced communications & sensing datasheet 3. configuration 3.1. general presentation sx8733 / sx8743 / sx8744 include an on- chip pn junction to measure local tempera- ture t j . the device has a 2-level current source and an adc to measure each diodes forward voltage to compute the temperature. the input multiplexer allows 3 external and 1 internal sensors to be connected to the adc. two alarms can provide to the system the information that a sensor temperature has reached the programmable threshold. the chip is configured with a 2-wire smbus serial line. the functional diagram is shown in figure 2. figure 2. functional diagram 3.2. modes the mode set in regconfig allows numerous circuit configurations described in figure 3 and figure 4. up to 3 external sensors can be connected. theses a re configured with differential or single-ended con nections. some modes provide a track resistance cancellation feature to decrease temperature inaccuracy linked t o long pcb traces connecting the external sensor to the chip. this is set in regcontrol (bits point3 or algo ). table 4 presents the mode for the sx8743. table 4 features available with sx8743 due to their limited number of ports, sx8733 and sx 8744 do not offer all theses features. sx8733 does not provide ports p3 and p4 so modes 8 to 20 should not be used. also port p3 is not available on sx8744 and this typica lly reduces the number of alarm or the number of external sensors. mode 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 external sensor 1 1 1 0 2 2 1 1 1 1 1 2 2 2 2 2 3 3 3 1 differential x x x x x x x single-ended x x x x x x x x x x x x algorithmic track resistance cancellation x x x x x x x 3-point track resistance cancellation x x x x kelvin (4-wire) track resistance cancellation x alarm # 0 0 0 2 0 0 1 1 2 2 2 0 0 2 2 1 1 1 0 0 alarm smbus + + + - - - - adc d1+ mux + d1- d2+ d2- d3+ d3- al2 decoder p1 p2 p3 p4 al1 smbclk smbdat vdd vss 1 6 4 3 5 2 6 3 2 2 3 4 6 8 7 1 5 sx8733 sx8744 sx8743
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 8 digital temperature sensor advanced communications & sensing datasheet figure 3. mode connection diagrams (modes 0 to 12 ) p1 p2 mode 0, mode 1 p1 p2 mode 2 p1 p2 alarm1 alarm2 mode 3 p1 p2 vss mode 4, mode 5 p1 p2 vss alarm1 mode 6, mode 7 p1 p2 p3 p4 alarm1 alarm2 mode 8, mode 9 p1 p2 p3 p4 alarm1 alarm2 mode 10 p1 p2 p3 p4 mode 11, mode 12 vdd vdd vdd vdd t d1 t d1 t d1 t d1 t d1 t d1 t d1 t d2 t d2
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 9 digital temperature sensor advanced communications & sensing datasheet figure 4. mode connection diagrams (modes 13 to 1 8 and 20) p1 p2 p3 p4 vss mode 13, mode 14 alarm1 p1 p2 p3 p4 mode 15 p1 p2 p3 p4 vss mode 16, mode 17 p1 p2 p3 p4 mode 18 vdd alarm2 alarm1 vdd vdd alarm1 mode 20 p1 p2 p3 p4 t d1 t d2 t d3 t d1 t d2 t d1 t d1 t d2 t d1 t d2 t d3
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 10 digital temperature sensor advanced communications & sensing datasheet 3.3. differential and single-ended external sensor table 4 indicates whether the external sensors are c onnected differentially or in single-ended configur ation with grounded cathode. differential modes have better common-mode rejectio n of external noise pickup. the external noise pick up is present equally on the anode and the cathode therefore diff erential noise is minimized. single-ended modes allow more sensors to be connect ed to the chip but they are more prone to noise pic kup since the cathode is connected to a common vss and, therefore , any external noise pickup tends to be developed m ainly across the anode which will be measured as temperature noise. a filtering capacitor is recommended to decrease me asurement noise especially if the external sensor i s connected to the chip by a long trace. a capacitor with a value of 1 00 pf should be placed as close as possible to the chip pins. 3.4. measurement principle the circuit uses the intrinsic thermal property of a diode to measure temperature. temperature is calc ulated by measuring the base-emitter voltage of a transistor. two diffe rent currents are sourced to the diodes. the base-e mitter voltage is measured in each case. with a fixed current ratio, temperature is accurately calculated by measuring t he difference in the base-emitter voltage at the two currents. the excitation current i 2 of 100ua is passed through the diode first. the ba se-emitter voltage of the transistor is measured by the adc. the measurement is then repeated using the excitation current divided by a fixed value. th is current i 1 has a value of 10ua. the following equation relates the v be difference voltage with current and temperature t where: k is the boltzmanns constant (1.381 x 10 -23 j/k) q is the charge on the electron (1.602 x 10 -19 cb). t abs is the absolute temperature in kelvins. (t abs =273.15 + t where t is the temperature in celsius). n is the pn junction ideality factor (1.00 for an i deal diode) for a current ratio i 2 /i 1 =10 and an ideality factor n=1.010, this gives a fixed relationship between d v be and temperature of 200uv/oc. the voltage is then converted to digital with an adc. 3.5. parasitic track resistance cancellation the temperature measurement method described previo usly assumes a very low series impedance in the sensor path.with a typical d v be around 200uv/oc and the d i=i 2 -i 1 =90ua, 1 ohm of parasitic resistance in the sensor path gives approximately 0.45oc of te mperature error. this may result in a significant error if the exter nal sensor is located some distance away from the chip. track resistance cancellation schemes decrease temperature error due to high resi stance in the tracks from the device to the sensors. 3.5.1. algorithmic track resistance cancellation the use of the algorithmic track resistance cancell ation allows automatic cancellation of resistances in series with the temperature diode by using current modulation to bi as the external diode. this is done transparently t o the user. this method may cancel up to 1 kohm of series resistance . the best accuracy is in the t d range 20oc to 70oc. 3.5.2. 3-point track resistance cancellation the 3-point track resistance cancellation requires one additional connection to the external pn juncti on so that an additional current source can be used to cancel out the error voltage due to the track resistance. d v be v be 2 v be 1 C n kt abs q ------------- i 2 i 1 ---- ? ? ? ? ln = = d t rtrack r track i 2 i 1 C 200 uv c ------------------------ =
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 11 digital temperature sensor advanced communications & sensing datasheet track resistances up to 1 kohm may be cancelled. it is important that the track resistance values in t he cathode or anode path of the external sensor are made equal. care mu st be taken during pcb layout to match track resist ances between the device and the sensor. any resistance difference wi ll lead to cancellation errors. in this mode, vss is used for the current return pa th from the cathode. this connection must be placed close to the diodes cathode. one port supply the current modulation to the anode and another port supply the cancellation current to the cathode. the resulting junction voltage modulation is measured between the 2 used ports. figure 5 expla ins the method: assume sensor q1 is being measured in mode 2 with 3-point track resistance cancellation enabled. the pcb trac e linking the device to the external sensor must be matched which means the pcb track resistance are the same. the same current is forced out of p1 and p2. the voltages developed on p1 and p2 traces are the same therefore the differential voltage seen on p1-p2 is not impacted by the track resistance. figure 5. 3-point track resistance cancellation 3.5.3. the kelvin (4-wire) track resistance cancel lation the sensor is connected to the chip via 4 wires. tw o comes from the current source (force : p3, p4) and two are use d for the voltage measurement (sense : p1, p2). the kelvin connection avoids the measurement error caused by the voltage drop in the force path. sense leads are attached directly accross the exter nal sensor. the p1 and p2 connections must be as close as possi ble to sensor anode and cathode respectively. figure 6. kelvin (4-wire) track resistance cancel lation 3.6. temperature acquisition sequence the sx8743 monitors up to 4 sensors (3 remote and 1 internal). theses can be scanned in sequence to ma ke an automatic reading of the sensors one after the othe r. the result of each conversion is stored in the t emperature registers (see table 6). the register regsensor defines which sensors are scanned in the sequence. when all the sensors are selected, the sequence is the following: int ? ext1 ? ext2 ? ext3 ? int ? etc. p1 p2 vss v1 v2 i i 2i v1 p1 p2 p3 p4 i force (+) force (-) sense (-) i sense (+)
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 12 digital temperature sensor advanced communications & sensing datasheet 3.7. alarm alarm threshold registers ( regalarm1 and regalarm2 ) contain the value the user wishes the alarms to trip on. the alarm data format is the same as the temperature data format which is set in regcontrol (bit tempoffsetmode ). in other words, in binary mode alarm value is set in degree; in offset binary mode alarm is set in with an offset of 64. the alarm calculation is performed at the end of th e temperature sensing cycle. therefore, if tempoffsetmode bit or alarm values are changed, a temperature sen sor measurement must be run to update the alarm outputs . depending on the selected mode, the chip can have t wo alarm outputs: alarm1 and alarm2. if the external or internal temperature exc eeds or goes under a programmed temperature threshold, the alarm is activated. any remote or local sensor may be selected to trigger alarm1 and alarm2. figure 7. alarm output internal simplified schema tics the pseudo-open drain output shown in figure 7 requi res a pull-up resistor connected to vdd. it allows connection to a gpio, a system shutdown or other thermal management circuitry. the alarm polarity can be set active low or high and, the over or under temperature can also be set with regalarmset register. to prevent alarm outputs to trig constantly when the limit temperature is reached, the regalarmhyst register holds a hysteresis value. the alarm remains active while the temperature is superior to the alarm threshold minus the value programmed in the regalarmhyst register (for a trig on over-temperature) as described on figure 8. figure 8. alarm output 3.8. temperature data format temperature output code from the internal and exter nal sensors are made of 2 bytes. the temperature hi gh byte has an lsb representing 1oc and contains the integer part of the temperature while the low byte contains the fractional value with a resolution of 0.125oc. the sx8733 has 2 temperature data formats. by defau lt, the format is binary and the measurement range is from 0oc to 127oc. to extend the measurement range to -40oc to +140oc, an offset of 64oc is added to the binary co de. when a conversion is complete, the main temperature register and the extended temperature register are updated simultaneously. ensure that no conversions are comp leted between reading the main register and the ext ended register, so that both registers contain the result of the sa me conversion. vdd vss alarm alarm threshold hysteresis remote or local temperature temperature alarm(1 or 2) time over-temperature
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 13 digital temperature sensor advanced communications & sensing datasheet 3.9. continuous time vs. single shot the chip can be operated in 2 distinct modes: conti nuous time or one-shot. the one-shot mode performs one temperature measurem ent of all sensors selected in regsensor . after completion, it returns to standby. in continuous temperature sampling, temperature mea surements are taken at regular intervals and the re sult held in internal registers accessible by smbus. the regadcrate register controls the sampling time period. 4. application note 4.1. typical temperature sensing system with a sx8 743 figure 9. sx8743 performs remote temperature meas urement in mode 8 when the remote-sensing diode is a discrete transis tor, its collector and base should be connected tog ether. an external capacitor of 100pf across the pn junction smoothes out external noise interference. the capacitor must be located very close to the pins. the ideality factor is a measure of the deviation o f the thermal diode from ideal behavior. the chips are trimmed for the pnp device described in table 5. temperature high byte temperature low byte temperature (oc) binary offset binary 1 1. offset binary scale temperature values are offset by 64oc temperature (oc) binary or offset binary -40 or less 0000 0000 2 2. binary scale returns 0oc for all temperatures <0o c 0001 1000 0 0000 0000 0100 0000 x.000 0000 0000 1 0000 0001 0100 0001 x.125 0000 0001 50 0011 0010 0111 0010 x.250 0000 0010 64 0100 0000 0000 0000 x.375 0000 0011 100 0110 0100 1010 0100 x.500 0000 0100 127 0111 1111 1011 1111 x.625 0000 0101 140 or more 0111 1111 3 3. binary scale returns 127oc for all temperatures > 127oc 1100 1100 x.750 0000 0110 diode fault 1111 1111 4 4. a diode fault is detected when the temperature ad c hard limits at 0% or 100% pulse density 1111 1111 4 x.875 0000 0111 smbus interface host 10k 10k 3.3v p1 p2 p3 p4 vss smbclk smbdat sx8743 100pf alarm1 vdd gpio vss 10k 10k 100nf alarm2 vbus 1 78 2 6 3 4 5 mmbt3906
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 14 digital temperature sensor advanced communications & sensing datasheet a different ideality factor causes a change in the slope of the linear equation d v be =f(t). gain and offset can be adjusted with the registers regextgain and regextoffset to compensate for small variations in n. large power transistors must not be used. table 5 recommended device 5. power-up sequence and standby mode at power-up, the device is in one-shot mode waiting for an smbus command to start conversion. the meas urement interval and the alarm thresholds will default to a set value at power-up but may be reconfigured to d ifferent values with smbus command. between temperature measurements, to decrease power consumption, the chip will shut down into its low- power standby state with most functions disabled. 6. serial interface 6.1. register write - combined format 6.2. register write - direct format part number manufacturer package mmbt3906 fairchild sot23-3 d t nfact n nom n actual --------------- 1 C ? ? ? ? t d 273.15 + ( ) = slave address 0x4c r/ w ra 7 ra 6 ra 5 ra 4 ra 3 ra 2 ra 1 ra 0 slave ack driven by sx8733 register address start by master restart by master slave ack driven by sx8733 r/ w slave ack driven by sx8733 wd 7 wd 6 wd 5 wd 4 wd 3 wd 2 wd 1 wd 0 slave ack driven by sx8733 write data stop by master write to single register (combined format) sa 6 sa 5 sa 4 sa 3 sa 2 sa 1 sa 0 slave address 0x4c sa 6 sa 5 sa 4 sa 3 sa 2 sa 1 sa 0 r/w ra7 ra6 ra5 ra4 ra3 ra2 ra1 ra0 slave ack driven by sx8733 register address start by master slave ack driven by sx8733 wd7 wd6 wd5 wd4 wd3 wd2 wd1 wd0 slave ack driven by sx8733 write data stop by master write to single register (direct format) sa6 sa5 sa4 sa3 sa2 sa1 sa0 slave address 0x4c
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 15 digital temperature sensor advanced communications & sensing datasheet 6.3. register read - combined format 6.4. register read - direct format 6.5. soft reset the user may reset the circuit via smbus by sending a general call address at slave address 0x00 follo wed by the reset command 0x06. in other words, as illustrated in the figure below, a soft reset can be generated by sen ding a command at slave address 0x00 (rather than the regular 0x4c sl ave address) to ic register address 0x06 with any d ata (0xxx). the soft reset command sets the circuit and registe rs in the same state as after a power-up. read from single register (combined format) r/ w ra 7 ra 6 ra 5 ra 4 ra 3 ra 2 ra 1 ra 0 slave ack driven by sx8733 register address start by master restart by master slave ack driven by sx8733 r/ w slave ack driven by sx8733 rd 7 rd 6 rd 5 rd 4 rd 3 rd 2 rd 1 rd 0 nack driven by master read data driven by sx8733 stop by master sa 6 sa 5 sa 4 sa 3 sa 2 sa 1 sa 0 sa 6 sa 5 sa 4 sa 3 sa 2 sa 1 sa 0 slave address 0x4c slave address 0x4c read from single register (short format) r/ w start by master r/ w slave ack driven by sx8733 rd 7 rd 6 rd 5 rd 4 rd 3 rd 2 rd 1 rd 0 nack driven by master read data driven by sx8733 stop by master sa 6 sa 5 sa 4 sa 3 sa 2 sa 1 sa 0 slave address 0x4c r/w ra7 ra6 ra5 ra4 ra3 ra2 ra1 ra0 slave ack driven by sx8733 register address 0x06 start by master slave ack driven by sx8733 wd7 wd6 wd5 wd4 wd3 wd2 wd1 wd0 slave ack driven by sx8733 write data 0xxx stop by master reset sa6 sa5 sa4 sa3 sa2 sa1 sa0 slave address 0x00
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 16 digital temperature sensor advanced communications & sensing datasheet 7. register / memory map each register is described in the following registe r memory map. these are identified by a register na me and corresponding hexadecimal register address. 7.1. memory map table 6 memory map 7.2. registers description identification registers 0x00 regconfig determines the chip variant and the co mmunication interface (i2c or smbus) 0x06 regextgain sets the calibration gain for remote temperature measurement 0x07 regextoffset sets the calibration offset for rem ote temperature measurement 0x20 regdeviceid read-only id = 0x33 0x21 regdeviceversion read-only circuit revision configuration registers 0x22 regsensor defines which sensors are scanned in s equence 0x23 regalarm1 alarm1 threshold 0x24 regalarm2 alarm2 threshold 0x25 regalarmset defines which sensors control alarms 1 and 2, and w hether over-/under- temperature triggers for each alarm 0x26 regalarmhyst alarm hysteresis 0x27 regadcrate temperature conversion rate temperature registers 0x28 reginttempmsb t j temperature reading for internal sensor, integer pa rt, lsb = 1oc 0x29 reginttemplsb t j temperature reading for internal sensor, fractional part, lsb = 0.125oc 0x2a regexttemp1msb t d1 temperature reading for external sensor 1, integer part, lsb = 1oc 0x2b regexttemp1lsb t d1 temperature reading for external sensor 1, fraction al part, lsb = 0.125oc 0x2c regexttemp2msb t d2 temperature reading for external sensor 2, integer part, lsb = 1oc 0x2d regexttemp2lsb t d2 temperature reading for external sensor 2, fraction al part, lsb = 0.125oc 0x2e regexttemp3msb t d3 temperature reading for external sensor 3, integer part, lsb = 1oc 0x2f regexttemp3lsb t d3 temperature reading for external sensor 3, fraction al part, lsb = 0.125oc general registers 0x30 regcontrol general control register 0x31 regstatus general status register addr: 0x00 regconfig bits name mode reset description 7:6 reserved rw 00 write to 00 5 setinterface rw 1 select between i2c or smbus interface 0: i2c (time out disabled) 1: smbus 4:0 mode rw 00000 select the configuration mode 00000: mode 0 00001: mode 1 ... 10010: mode 18 10100: mode 20
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 17 digital temperature sensor advanced communications & sensing datasheet addr: 0x06 regextgain bits name mode reset description 7:6 reserved rw 00 write to 00 5:0 extgain rw xxxxxx gain adjustement for external temperature measureme nt do not write to avoid production calibration alteri ng addr: 0x07 regextoffset bits name mode reset description 7:0 extoffset rw xxxxxxxx offset adjustement for external temperature measure ment. do not write to avoid production calibration alteri ng addr: 0x22 regsensor bits name mode reset description 7:4 reserved rw 0000 write to 0000 3 selext3 rw 0 0: external sensor 3 not in temp. scan sequence 1: enable external sensor 3 to be in temp. scan seq uence 2 selext2 rw 0 0: external sensor 2 not in temp. scan sequence 1: enable external sensor 2 to be in temp. scan seq uence 1 selext1 rw 0 0: external sensor 1 not in temp. scan sequence 1: enable external sensor 1 to be in temp. scan seq uence 0 selint rw 1 0: internal sensor not in temp. scan sequence 1: enable internal sensor to be in temp. scan seque nce addr: 0x23 regalarm1 bits name mode reset description 7:0 threshold1 rw 01000000 alarm1 temperature threshold. the data is coherent with the binary and offset format. 1lsb=1 oc addr: 0x24 regalarm2 bits name mode reset description 7:0 threshold2 rw 01000000 alarm2 temperature threshold. the data is coherent with the binary and offset format. 1lsb=1 oc addr: 0x25 regalarmset bits name mode reset description 7 reserved rw 0 write to 0 6 alarmpolarity rw 0 0: alarm1, alarm2 outputs active high 1: alarm1, alarm2 outputs active low 5 direction2 rw 0 0: trigger on over-temperature for alarm2 1: trigger on under-temperature for alarm2 4 direction1 rw 0 0: trigger on over-temperature for alarm1 1: trigger on under-temperature for alarm1 3:2 select2 rw 00 00: external 1 sensor controls alarm2 01: external 2 sensor controls alarm2 10: external 3 sensor controls alarm2 11: internal sensor controls alarm2 1:0 select1 rw 11 00: external 1 sensor controls alarm1 01: external 2 sensor controls alarm1 10: external 3 sensor controls alarm1 11: internal sensor controls alarm1 addr: 0x26 regalarmhyst bits name mode reset description 7:4 hysteresis2 rw 0100 defines alarm2 hysteresis with 1oc resolution. (0 to 15oc) 3:0 hysteresis1 rw 0100 defines alarm1 hysteresis with 1oc resolution. (0 to 15oc)
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 18 digital temperature sensor advanced communications & sensing datasheet addr: 0x27 regadcrate bits name mode reset description 7:5 reserved rw 000 write to 000 4 oneshot rw 0 0: standby 1: perform one temperature measurement 3 regular rw 0 0: disable continuous temperature sampling 1: enable continuous temperature sampling 2:0 rate rw 000 temperature sampling rate 000: 0.1 second (continuous sampling) 001: 0.25 second 010: 0.50 second 011: 1 second 100: 2 seconds 101: 4 seconds 110: 8 seconds 111: 16 seconds addr: 0x28 reginttempmsb bits name mode reset description 7:0 inttempmsb r 00000000 msb of internal temperature t j . lsb=1oc addr: 0x29 reginttemplsb bits name mode reset description 7:3 reserved r 00000 2:0 inttemplsb r 000 lsb of internal temperature t j . lsb=0.125oc addr: 0x2a regexttemp1msb bits name mode reset description 7:0 exttemp1msb r 00000000 msb of external temperature t d1 . lsb=1oc addr: 0x2b regexttemp1lsb bits name mode reset description 7:3 reserved r 00000 2:0 exttemp1lsb r 000 lsb of external temperature t d1 . lsb=0.125oc addr: 0x2c regexttemp2msb bits name mode reset description 7:0 exttemp2msb r 00000000 msb of external temperature t d2 . lsb=1oc addr: 0x2d regexttemp2lsb bits name mode reset description 7:3 reserved r 00000 2:0 exttemp2lsb r 000 lsb of external temperature t d2 . lsb=0.125oc addr: 0x2e regexttemp3msb bits name mode reset description 7:0 exttemp3msb r 00000000 msb of external temperature t d3 . lsb=1oc addr: 0x2f regexttemp3lsb bits name mode reset description 7:3 reserved r 00000 2:0 exttemp3lsb r 000 lsb of external temperature t d3 . lsb=0.125oc
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 19 digital temperature sensor advanced communications & sensing datasheet addr: 0x30 regcontrol bits name mode reset description 7:5 reserved rw 000 write to 000 4 clockstretching rw 1 0: no clock stretching 1: enable clock stretching 3 tempoffsetmode rw 0 0: binary mode 1: offset binary mode 2 point3 rw 0 0: disable 3-point track resistance cancellation 1: enable 3-point track resistance cancellation 1 algo rw 0 0: disable algorithmic track cancellation 1: enable algorithmic track cancellation 0 bit0 rw 1 this bit must be set to 1 addr: 0x31 regstatus bits name mode reset description 7:4 reserved w 0000 write to 0000 3 exttemp3end w 1 0 1: external temperature 3 conversion complete 2 exttemp2end w 1 0 1: external temperature 2 conversion complete 1 exttemp1end w 1 0 1: external temperature 1 conversion complete 0 inttempend w 1 0 1: internal temperature conversion complete 1. write logic 1 to register bit to clear
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 20 digital temperature sensor advanced communications & sensing datasheet 8. packaging information 8.1. mlpd-w6-ep2 package outline drawing notes: 0.08 0.40 6 0.30 2.90 0.00 0.70 3.10 0.45 3.00 0.05 0.80 (0.20) 0.10 0.95 bsc 0.30 0.40 0.50 aaa c seating plane a bbb c a b b e c 0.75 (laser mark) indicator pin 1 1 n 2 aaa bbb be l n d e a1 a2 a millimeters nom dimensions min max 2.90 3.00 3.10 bxn coplanarity applies to the exposed pad as well as t erminals. controlling dimensions are in millimeters (angles i n degrees). 1. 2. d e e/2 d/2 a1 a 0.02 d1 2.23 2.38 2.48 e1 1.50 1.65 1.75 a2 dim d1 e1 lxn
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 21 digital temperature sensor advanced communications & sensing datasheet 8.2. mlpd-w6-ep2 land pattern drawing 3.70 0.45 0.75 0.95 2.20 (2.95) this land pattern is for reference purposes only. consult your manufacturing group to ensure your company's manufacturing guidelines are met. notes: 2. thermal vias in the land pattern of the exposed pad shall be connected to a system ground plane. functional performance of the device. failure to do so may compromise the thermal and/or 3. 1. controlling dimensions are in millimeters (angles i n degrees). dimensions g xy p z c dim millimeters r 0.225 x y g z p (c) k 2.38 h 1.65 h k r
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 22 digital temperature sensor advanced communications & sensing datasheet 8.3. package outline drawing: msop-8 0 .010 .004 - .016 .003 .024 (.037) - .000 .030 - - -- 0.25 0.10 8 0 - 8 0.60 (.95) .032 .009 0.40 0.08 .043 .006 .037 0.75 0.00 - 0.80 0.23 - 0.95 1.10 0.15 - -- 3. dimensions "e1" and "d" do not include mold flash, protrusions or gate burrs. -b- controlling dimensions are in millimeters (angles i n degrees). datums and to be determined at datum plane notes: 1. 2. -a- -h- side view a b c e h e/2 d plane detail .193 bsc .026 bsc aaa c seating ccc c 2x n/2 tips indicator e/2 pin 1 2x 8 bbb c a-b d see detail a1 a a2 bxn d 0.25 a plane gage .005 e1 1 2 n .114 .114 .118 .118 .009 - 8 01 c (l1) l a 0.13 3.00 3.00 4.90 bsc 0.65 bsc .122 .122 2.90 2.90 .015 0.22 3.10 3.10 0.38 - reference jedec std mo-187, variation aa. 4. dim ccc a1 e bbb aaa 01 l1 n l d e1 e a2 b c a millimeters nom dimensions inches min nom max min max e
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 23 digital temperature sensor advanced communications & sensing datasheet 8.4. land pattern drawing: msop-8 this land pattern is for reference purposes only. consult your manufacturing group to ensure your company's manufacturing guidelines are met. notes: 1. p x (c) y z g .224 .063 .016 .026 (.161) .098 (4.10) 5.70 1.60 0.40 0.65 2.50 millimeters dimensions dim inches x z y c p g
acs revision 2.91/february 2010 ?2010 semtech corp. sx8733/sx8743/sx8744 www.semtech.com page 24 semtech corporation advanced communications & sensi ng products contact information taiwan korea shanghai japan tel: 886-2-2748-3380 fax: 886-2-2748-3390 tel: 82-2-527-4377 fax: 82-2-527-4376 tel: 86-21-6391-0830 fax: 86-21-6391-0831 tel: 81-3-6408-0950 fax:81-3-6408-0951 switzerland united kingdom france germany tel: 41-32-729-4000 fax: 41-32-729-4001 tel: 44-1794-527-600 fax: 44-1794-527-601 tel: 33-(0)169-28-22-00 fax: 33-(0)169-28-12-98 tel: 49-(0)8161-140-123 fax:49-(0)8161-140-124 iso9001 certified advanced communications & sensing datasheet ? semtech 2009* all rights reserved. reproduction in whole or in pa rt is prohibited without the prior written consent of the copyright owner. the information presented in this document does not for m part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. no liability wil l be accepted by the publisher for any consequence of its use. publication thereof does not convey nor imply any license under patent or other industrial or intellectual propert y rights. semtech assumes no responsibility or liability whatsoever for any f ailure or unexpected operation resulting from misus e, neglect improper installation, repair or improper handling or unusua l physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. semtech products are not designed, intended, author ized or warranted to be suitable for use in life-support applications, devices or systems or ot her critical applications. inclusion of semtech products in such applications is understood to be undertaken solely at the customers own risk. should a customer purchase or use semtech products for any such unauthorized application, th e customer shall indemnify and hold semtech and its officers, employ ees, subsidiaries, affiliates, and distributors har mless against all claims, costs damages and attorney fees which could arise.

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