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1 ultra-low lux, low power, integrated digital ambient light sensor with interrupt function ISL29033 the ISL29033 is an integrated ambient and infrared light to digital converter with i 2 c (smbus compatible) interface. its advanced, self-calibrated phot odiode array emulates human eye response with excellent ir rejection. the on-chip 16-bit adc is capable of rejecting 50hz and 60hz flicker caused by artificial light sources. the lu x range select feature allows users to program the lux range for optimized counts/lux. power consumption can be reduced to less than 0.3a when powered down. the ISL29033 supports a software and hardware interrupt that remains asserted until the host clears it through the i 2 c interface. the function of adc conversion continues without stopping after interrupt is asserted. designed to operate on supplies from 2.25v to 3.63v with an i 2 c supply from 1.7v to 3.63v, the ISL29033 is specified for operation over the -40c to +85c ambient temperature range. related literature ?see an1422 ?light sensor applications? features ? ambient light sensing ? simple output code direct ly proportional to lux ? variable conversion resolution up to 16 bits ? adjustable sensitivity up to 520 counts per lux ? measurement range: 0.0019 to 8,000lux with four selectable ranges ? program interrupt feature ? light sensor close to human eye response - excellent light sensor ir and uv rejection ?75 a max operating current -0.3 a max shutdown current ? 6 ld 2.0mmx2.1mmx0.7mm odfn package applications ? display and keypad dimming adjustment for: - mobile devices: smart phone, pda, gps - computing devices: notebook pc, webpad - consumer devices: lcd-tv, digital picture frame, digital camera ? industrial and medical light sensing vdd rext gnd sda scl command register integration adc data register photodiode light 3 2 5 6 1 f osc iref 4 int process array data i 2 c/smbus interrupt register figure 1. block diagram caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas llc 2011, 2013. all rights reserved intersil (and design) is a trademark owned by intersil corporation or one of its subsidiaries. i 2 c bus is a registered trademark owned by nxp semiconductors netherlands, b.v. all other trademarks mentioned are the property of their respective owners. february 25, 2013 fn7656.2
ISL29033 2 fn7656.2 february 25, 2013 pin configuration ISL29033 (6 ld odfn) top view 1 2 3 6 5 4 vdd gnd rext sda scl int *exposed pad can be connected to gnd or electrically isolated pd* pin descriptions pin number pin name description pd pd thermal pad (connect to gnd, or float) 1 vdd positive supply: 2.25v to 3.63v 2gndground 3 rext external resistor pin for adc reference; connect this pin to ground through a (nominal) 499 k ? resistor. 4 int interrupt pin; low for interrupt alarming. int pin is open drain. int remains asserted until the interrupt flag status bit is reset. 5scli 2 c serial clock 6sdai 2 c serial data ordering information part number (notes 1, 2, 3, 4) temp. range (c) package tape and reel (pb-free) pkg. dwg. # ISL29033iroz-t7 -40 to +85 6 ld odfn l6.2x2.1 ISL29033iroz-evalz evaluation board notes: 1. please refer to tb347 for details on reel specifications. 2. these intersil pb-free plastic packaged products employ specia l pb-free material sets; molding compounds/die attach materials and nipdau plate - e4 termination finish, which is rohs compliant and compatible with both snpb an d pb-free soldering operations. intersil p b-free products are msl classified at pb-free peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. 3. for moisture sensitivity level (msl), please see device information page for ISL29033 . for more information on msl please see tech brief tb477 . 4. the part marking is located on the bottom of the part.
ISL29033 3 fn7656.2 february 25, 2013 absolute maximum ratings (t a = +25 c) thermal information v dd supply voltage between v dd and gnd . . . . . . . . . . . . . . . . . . . . . .4.0v i 2 c bus pin voltage (scl, sda). . . . . . . . . . . . . . . . . . . . . . . . . -0.2v to 4.0v i 2 c bus pin current (scl, sda). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10ma r ext pin voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.2v to vdd + 0.5v int pin voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to vdd + 0.5v int pin current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10ma esd rating human body model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kv thermal resistance (typical) ja (c/w) 6 ld odfn (note 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 maximum die temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +90c storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40c to +100c operating temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40c to +85c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/ pbfree/pb-freereflow.asp recommended operating conditions temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40c to +85c supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.25v to 3.63v caution: do not operate at or near the maximum ratings listed for extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. note: 5. ja is measured in free air with the componen t mounted on a high effective thermal conduc tivity test board with ?direct attach? fe atures. see tech brief tb477 . important note: all parameters having min/max specifications are guaranteed. typical values are for information purposes only. u nless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: t j = t c = t a electrical specifications v dd = 3.0v, t a = +25c, r ext = 499k 1% tolerance, 16-bit adc operation, unless otherwise specified. parameter description condition min (note 6) typ max (note 6) unit v dd power supply range 2.25 3.63 v i dd supply current 65 75 a i dd1 supply current when powered down software disabled or auto power-down 0.01 0.3 a v i2c supply voltage range for i 2 c interface 1.7 3.63 v f osc internal oscillator frequency 600 670 740 khz t int adc integration/conversion time 16-bit adc data 100 ms f i2c i 2 c clock rate range 1 to 400 khz data_0 count output when dark e = 0 lux, range 1 (125 lux) 1 5 counts data_f full scale adc code 65535 counts data data count output variation over three light sources: fluorescent, incandescent and sunlight ambient light sensing 10 % data_1 light count output with lsb of 0.0019 lux/count e = 37.5 lux, fluorescent light (note 7), ambient light sensing, range 1 (125 lux) 16000 20000 24000 counts data_2 light count output with lsb of 0.0075 lux/count e = 37.5 lux, fluorescent light (note 7), ambient light sensing, range 2 (500 lux) 5000 counts data_3 light count output with lsb of 0.03 lux/count e = 37.5 lux, fluorescent light (note 7), ambient light sensing, range 3 (2k lux) 1250 counts data_4 light count output with lsb of 0.12 lux/count e = 37.5 lux, fluorescent light (note 7), ambient light sensing, range 4 (8k lux) 312 counts data_ir1 infrared count output e = 20 lux solar light (note 8), ambient light sensing, range 1 (125 lux) 16000 20000 24000 counts data_ir2 infrared count output e = 20 lux solar light (note 8), ambient light sensing, range 2 (500 lux) 5000 counts
ISL29033 4 fn7656.2 february 25, 2013 data_ir3 infrared count output e = 20 lux solar light (note 8), ambient light sensing, range 3 (2000 lux) 1250 counts data_ir4 infrared count output e = 20 lux solar light (note 8), ambient light sensing, range 4 (8000 lux) 312 counts v ref voltage of rext pin 0.52 v v il scl and sda input low voltage 0.55 v v ih scl and sda input high voltage 1.25 v i sda sda current sinking capability v ol = 0.4v 4 5 ma i int int current sinking capability v ol = 0.4v 4 5 ma electrical specifications v dd = 3.0v, t a = +25c, r ext = 499k 1% tolerance, 16-bit adc operation, unless otherwise specified. (continued) parameter description condition min (note 6) typ max (note 6) unit electrical specifications v dd = 3.0v, t a = +25c, r ext = 1m 1% tolerance, 16-bit adc operation, unless otherwise specified. parameter description condition min (note 6) typ max (note 6) unit v dd power supply range 2.25 3.63 v i dd supply current 42 50 a i dd1 supply current when powered down software disabled or auto power-down 0.01 0.3 a v i2c supply voltage range for i 2 c interface 1.7 3.63 v f osc internal oscillator frequency 305 340 385 khz t int adc integration/conversion time 16-bit adc data 200 ms f i2c i 2 c clock rate range 1 to 400 khz data_0 count output when dark e = 0 lux, range 1 (125 lux) 1 10 counts data_f full scale adc code 65535 counts data data count output variation over three light sources: fluorescent, incandescent and sunlight ambient light sensing 10 % data_1 light count output with lsb of 0.00095 lux/count e = 18.75 lux, fluorescent light (note 7), ambient light sensing, range 1 (62.5 lux) 15000 20000 25000 counts data_2 light count output with lsb of 0.000375 lux/count e = 18.75 lux, fluorescent light (note 7), ambient light sensing, range 2 (250 lux) 5000 counts data_3 light count output with lsb of 0.015 lux/count e = 18.75 lux, fluorescent light (note 7), ambient light sensing, range 3 (1k lux) 1250 counts data_4 light count output with lsb of 0.6 lux/count e = 18.75 lux, fluorescent light (note 7), ambient light sensing, range 4 (4k lux) 312 counts data_ir1 infrared count output e = 10 lux solar light (note 8), ambient light sensing, range 1 (62.5 lux) 15000 20000 25000 counts data_ir2 infrared count output e = 10 lux solar light (note 8), ambient light sensing, range 2 (250 lux) 5000 counts data_ir3 infrared count output e = 10 lux solar light (note 8), ambient light sensing, range 3 (1000 lux) 1250 counts data_ir4 infrared count output e = 10 lux solar light (note 8), ambient light sensing, range 4 (4000 lux) 312 counts v ref voltage of rext pin 0.52 v
ISL29033 5 fn7656.2 february 25, 2013 v il scl and sda input low voltage 0.55 v v ih scl and sda input high voltage 1.25 v i sda sda current sinking capability v ol = 0.4v 4 5 ma i int int current sinking capability v ol = 0.4v 4 5 ma notes: 6. compliance to datasheet limits is assu red by one or more methods: production test, characterization and/or design. 7. a 550nm green led is used in production test. the 550nm led irradi ance is calibrated to produce the same data count as a fluo rescent light with illuminance at the stated lux. 8. an 850nm ir led is used in production test. the 850nm led irradi ance is calibrated to produce the same data_ir count as solar light with illuminance at the stated lux. i 2 c electrical specifications for scl and sda (figure 2), unless otherwise noted, v dd = 3v, t a = +25c, r ext = 499k ? 1% and 1m ? 1% tolerance. parameter description condition min (note 6) typ max (note 6) unit v i2c supply voltage range for i 2 c interface 1.7 3.63 v f scl scl clock frequency 400 khz v il scl and sda input low voltage 0.55 v v ih scl and sda input high voltage 1.25 v v hys hysteresis of schmitt trigger input 0.05v dd v v ol low-level output voltage (open-drain) at 4ma sink current 0.4 v i i input leakage for each sda, scl pin -10 10 a t sp pulse width of spikes that must be suppressed by the input filter 50 ns t aa scl falling edge to sda output data valid 900 ns c i capacitance for each sda and scl pin 10 pf t hd:sta hold time (repeated) start condition after this period, the first clock pulse is generated. 600 ns t low low period of the scl clock measured at the 30% of v dd crossing 1300 ns t high high period of the scl clock 600 ns t su:sta set-up time for a repeated start condition 600 ns t hd:dat data hold time 30 ns t su:dat data set-up time 100 ns t r rise time of both sda and scl signals (note 9) 20 + 0.1xc b ns t f fall time of both sda and scl signals (note 9) 20 + 0.1xc b ns t su:sto set-up time for stop condition 600 ns t buf bus free time between a stop and start condition 1300 ns c b capacitive load for each bus line 400 pf r pull-up sda and scl system bus pull-up resistor maximum is determined by t r and t f 1k ? electrical specifications v dd = 3.0v, t a = +25c, r ext = 1m 1% tolerance, 16-bit adc operation, unless otherwise specified. (continued) parameter description condition min (note 6) typ max (note 6) unit
ISL29033 6 fn7656.2 february 25, 2013 principles of operation photodiodes and adc the ISL29033 contains two photodiode arrays that convert light into current. the spectral response for ambient light sensing and infrared (ir) sensing is shown in figure 8 in the ?typical performance curves? section on page 12. after light is converted to current during the light signal process, the current output is converted to digital by a built-in 16-bit analog-to-digital converter (adc). an i 2 c command reads the ambient light or ir intensity in counts. the converter is a charge-balancing integrating type 16-bit adc. the chosen method for conversion is best for converting small current signals in the presence of an ac periodic noise. a 100ms integration time, for instance, highly reject s 50hz and 60hz power line noise simultaneously. see ?integration and conversion time? on page 9. the built-in adc offers user flexibility in integration time or conversion time. there are two timing modes: internal timing mode and external timing mode. in internal timing mode, integration time is determined by an internal oscillator (f osc ) and the n-bit (n = 4, 8, 12, 16) counter inside the adc. in external timing mode, integration time is determined by the time between two consecutive i 2 c external timing mode commands. a good balance of integration time and resolution (depending on application) is required for optimal results. the adc has i 2 c programmable range select to dynamically accommodate various lighting conditions. for very dim conditions, the adc can be configured at its lowest range (range 1) in the ambient light sensing. low-power operation the ISL29033 initial operation is at the power-down mode after a supply voltage is provided. the data registers contain the default value of 0. when the ISL29033 receives an i 2 c command to do a one-time measurement from an i 2 c master, it starts adc conversion with light sensing. it goes to power-down mode automatically after one conversion is finished and keeps the conversion data available for the master to fetch anytime afterwards. the ISL29033 contin uously does adc conversion with light sensing if it receives an i 2 c command of continuous measurement. it continuously updates the data registers with the latest conversion data. it goes to power-down mode after it receives the i 2 c command of power-down. ambient light there are four operational modes in ISL29033: programmable als once with auto power-down, programmable ir sensing once with auto power-down, programmable continuous als sensing, and programmable continuous ir sensing. these four modes can be programmed in series to fulfill the application needs. the detailed program configuration is shown in ?block diagram? on page 1. when the part is programmed for ambient light sensing, the ambient light with wavelength within the ?ambient light sensing? spectral response curve in figure 8 is converted into current. with adc, the current is converted to an unsigned n-bit (up to 16 bits) digital output. when the part is programmed for infrared (ir) sensing, the ir light with wavelength within the ?ir sensing? spec tral response curve in figure 8 is converted into current. with adc, the current is converted to an unsigned n-bit (up to 16 bits) digital output. interrupt function the active low interrupt pin is an open drain pull-down configuration. the interrupt pin se rves as an alarm or monitoring function to determine whether the ambient light level exceeds the upper threshold or goes below the lower threshold. note that the function of adc conversion continues without stopping after interrupt is asserted. if the user needs to read the adc count that triggers the interrupt, reading should be done before the data registers are refreshed by subsequent conversions. the user can also configure the persistency of the interrupt pin. this reduces the possibility of false triggers, such as noise or sudden spikes in ambient light conditions. an unexpected camera flash, for example, can be ignored by setting the persistency to eight integration cycles. als ranges considerations when measuring als counts higher than 30000 counts on range 1 of the 16-bit adc, switch to range 2 (change [1 to 0] bits of register 1 from 00 to 01), and re-measure the als counts and other data to change to range 3 and range 4. this recommendation pertains only to applications in which light incident on the sensor is ir-heavy and is distorted by tinted glass that increases the ratio of infrared to visible light. v dd power-up and power supply considerations upon power-up, ensure a v dd slew rate of 0.5v/ms or greater. after power-up, or if the power supply temporarily deviates from t vd;dat data valid time 0.9 s t vd:ack data valid acknowledge time 0.9 s v nl noise margin at the low level 0.1v dd v v nh noise margin at the high level 0.2v dd v note: 9. c b is the capacitance of the bus in pf. i 2 c electrical specifications for scl and sda (figure 2), unless otherwise noted, v dd = 3v, t a = +25c, r ext = 499k ? 1% and 1m ? 1% tolerance. (continued) parameter description condition min (note 6) typ max (note 6) unit
ISL29033 7 fn7656.2 february 25, 2013 specification (2.25v to 3.63v), the following step is recommended: write 0x00 to regi ster 0x00. wait a few seconds, and then rewrite all registers to the desired values. a hardware reset method can be used, if preferred, instead of writing to the test registers. for this method, set v dd = 0v for 1 second or more, power backup at the required slew rate, and write the registers to the desired values. power-down to put the ISL29033 into a power-down state, the user can set [7 to 5] bits to 0 in register 0. or more simply, set all of register 0 to 0x00. i 2 c interface there are eight 8-bit registers av ailable inside the ISL29033. the two command registers define the operation of the device. the command registers do not change until the registers are overwritten. the two 8-bit data re ad-only registers are for the adc output. the data registers contain the adc's latest digital output, or the number of clock cycles in the previous integration period (figure 2). the ISL29033 i 2 c interface slave address is internally hard-wired as 1000100. when 1000100x, with x as r or w , is sent after the start condition, the device compares the first 7 bits of this byte to its address, and matches. figure 3 shows a sample one-byte read, and figure 4 shows a sample one-byte write. the i 2 c bus master always drives the scl (clock) line, while either the master or the slave can drive the sda (data) line. every i 2 c transaction begins with the master asserting a start condition (sda falling while scl remains high). the following byte is driven by the master and includes the slave address and th e read/write bit. the receiving device is responsible for pulling sda low during the acknowledgement period. every i 2 c transaction ends with the master asserting a stop condition (sda rising while scl remains high). for more information about the i 2 c standard, please consult the philips? i 2 c specification documents. figure 2. i 2 c timing diagram figure 3. i 2 c read timing diagram sample start w a a a6 a5 a4 a3 a2 a1 a0 w a r7 r6 r5 r4 r3 r2 r1 r0 a a6 a5 a4 a3 a2 a1 a0 w a a a ad7d6d5d4d3d2d1d0 1357 1357 123 45 6 9 2 4 6 stop start sda driven by master device address sda driven by ISL29033 data byte0 register address out device address i 2 c data sda driven by master sda driven by master 2468 924689 78135789 i 2 c sda i 2 c sda i 2 c clk in
ISL29033 8 fn7656.2 february 25, 2013 register set there are eight registers availa ble in the ISL29033. table 1 summarizes their functions. command register i 00 (hex) the first command register has the following functions: 1. operation mode: bits 7, 6, and 5. these three bits determine the operation mode of the device (table 2). interrupt flag: bit 2. this is the status bit of th e interrupt (table 3). the bit is set to logic high when the interrupt thresholds have been triggered (out of threshold wind ow), and to logic low when not yet triggered. when activated and the interrupt is triggered, the int pin goes low, and the interrupt status bit goes high until the status bit is polled through the i 2 c read command. both the int output and the interrupt status bit are automatically cleared at the end of the 8-bit (00h) command register transfer. figure 4. i 2 c write timing diagram sample start w a a a6 a5 a4 a3 a2 a1 a0 w a r7 r6 r5 r4 r3 r2 r1 r0 a b7 b6 b5 b4 b3 b2 b1 b0 a a 12615948 stop sda driven by master functions register address device address sda driven by master sda driven by master i 2 c data i 2 c sda in i 2 c sda out i 2 c clk in aa 345 7 89 234 678 12 3 5 67 9 a table 1. register set addr reg name bit 765 4 321 0default 00h commandi op2 op1 op0 0 0 flag prst1 prst0 00h 01h commandii 0 0 0 0 res1 res0 range1 range0 00h 02h data lsb d7 d6 d5 d4 d3 d2 d1 d0 00h 03h data msb d15 d14 d13 d12 d11 d10 d9 d8 00h 04h int_lt_lsb tl7 tl6 tl5 tl4 tl3 tl2 tl1 tl0 00h 05h int_lt_msb tl15 tl14 tl13 tl12 tl11 tl10 tl9 tl8 00h 06h int_ht_lsb th7 th6 th5 th4 th3 th2 th1 th0 ffh 07h int_ht_msb th15 th14 th13 th12 th11 th10 th9 th8 ffh table 2. operation mode bits 7 to 5 operation 000 power-down the device 001 reserved (do not use) 010 reserved (do not use) 100 reserved (do not use) 101 als continuous 110 ir continuous 111 reserved (do not use) table 3. interrupt flag bit 2 operation 0 interrupt is cleared or not triggered yet 1 interrupt is triggered
ISL29033 9 fn7656.2 february 25, 2013 2. interrupt persist: bits 1 and 0. the interrupt pin and the interrupt flag are triggered or set when the data sensor reading is out of the interrupt threshold window after m consecutive number of integration cycles (table 4). the interrupt persist bits determine m. command register ii 01 (hex) the second command register has the following functions: 1. resolution: bits 3 and 2. bits 3 and 2 determine the adc resolution and the number of clock cycles per conversion (table 5). changing the number of clock cycles does more than just change the resolution of the device; it also changes the integration time, which is the period during which the analog-to-digital (a/d) converter samples the photodiode current signal for a measurement. 2. range: bits 1 and 0. the full scale range (fsr) can be adjusted through the i 2 c by using bits 1 and 0. table 6 lists the possible values of fsr for the 499k ? r ext resistor. data registers (02 hex and 03 hex) the device has two 8-bit read-only registers to hold the data from lsb to msb for the adc (table 7) . the most significant bit (msb) is accessed at 03 hex, and the least significant bit (lsb) is accessed at 02 hex. for 16-bit resolution, the data is from d0 to d15; for 12-bit resolution, the data is from d0 to d11; for 8-bit resolution, the data is from d0 to d7. the registers are refreshed after every conversion cycle. interrupt registers (04, 05, 06 and 07 hex) registers 04 and 05 hex set the low (lo) threshold for the interrupt pin and the interrupt flag. register 04 hex is the lsb, and register 05 hex is the msb. by default, the interrupt threshold lo is 00 hex for both lsb and msb. registers 06 and 07 hex set the high (hi) threshold for the interrupt pin and the interrupt flag. register 06 hex is the lsb, and register 07 hex is the msb. by default, the interrupt threshold hi is ff hex for both lsb and msb. calculating lux the ISL29033 adc output codes, da ta, are directly proportional to lux in ambient light sensing, as shown in equation 1. in this equation, e cal is the calculated lux reading. the constant, a, is determined by the full scale range and the adc maximum output counts. the constant is independent of the light sources (fluorescent, incandescent and su nlight) because the light source ir component is removed during the light signal process. the constant can also be viewed as the sensitivity (the smallest lux measurement the device can measure), as shown in equation 2. in this equation, range(k) is as defined in table 6. count max is the maximum output counts from the adc. the transfer function used for n-bits adc is as shown in equation 3: in this equation, n = 4, 8, 12 or 16 and is the number of adc bits programmed in the command register. the number 2 n represents the maximum number of counts possible from the adc output. data is the adc output stored in data registers 02 hex and 03 hex. integration and conversion time adc resolution and f osc determine the integration time, t int , as shown in equation 4. in this equation, n is the number of bits of resolution, and n = 4, 8, 12 or 16. therefore, 2 n is the number of clock cycles. the value of n can be programmed at the command register, register 01 (hex), bits 3 and 2 (table 8). table 4. interrupt persist bit 1:0 number of integration cycles 00 1 01 4 10 8 11 16 table 5. adc resolution data width bits 3:2 number of clock cycles n-bit adc 00 2 16 = 65,536 16 01 2 12 = 4,096 12 10 2 8 = 256 8 11 2 4 = 16 4 table 6. range/fsr lux bits 1:0 k range(k) fsr (lux) @ als sensing 00 1 range1 125 01 2 range2 500 10 3 range3 2,000 11 4 range4 8,000 table 7. data registers address (hex) contents 02 d0 is lsb for 4-, 8-, 12- or 16-bit resolution; d3 is msb for 4-bit resolution; d7 is msb for 8-bit resolution 03 d15 is msb for 16-bit resolution; d11 is msb for 12-bit resolution e cal data = (eq. 1) range k () count max --------------------------- = (eq. 2) (eq. 3) e cal range k () 2 n -------------------------- data = t int 2 n 1 f osc ----------- - 2 n r ext 655khz 499k ---------------------------------------------- - == (eq. 4)
ISL29033 10 fn7656.2 february 25, 2013 external scaling resistor r ext for f osc and range the ISL29033 uses an external resistor, r ext , to fix its internal oscillator frequency, f osc , and the light sensing range, range. the f osc and range are inversely proportional to r ext . for ease of use, the proportionality co nstant is referenced to 499k ? . calculation for range is shown in equation 5 and for f osc in equation 6. noise rejection in general, integrating-type adcs have excellent noise rejection characteristics for periodic nois e sources for which frequency is an integer multiple of the conver sion rate. for example, a 60hz ac unwanted signal?s sum from 0ms to k*16.66ms (k = 1,2...k i ) is zero. similarly, setting the device?s integration time to be an integer multiple of the periodic noise signal greatly improves the light sensor output signal in the presence of noise. adc output in ir sensing the ISL29033 adc output codes, data, are directly proportional to the ir intensity received in ir sensing, as shown in equation 7. in this equation, e ir is the received ir intensity. the constant, b, changes with the spectrum of background ir noise, such as sunlight and incandescent light. the constant, b, also changes with adc range and resolution selections. suggested pcb footprint it is important that users check tech brief 477, ?surface mount assembly guidelines for optical dual flatpack no lead (odfn) package? before starting od fn product board mounting: http://www.intersil.com/data/tb/tb477.pdf layout considerations the ISL29033 is relatively insens itive to layout. like other i 2 c devices, it is intended to provide excellent performance even in significantly noisy environments. attention to a few considerations will en sure best performance. route the supply and i 2 c traces as far as possible from all sources of noise. use two power-supply decoupling capacitors, 1f and 0.1f, placed close to the device. typical circuit a typical application for the isl 29033 is shown in figure 5. the ISL29033 i 2 c address is internally hardwired as 1000100. the device can be tied onto a system?s i 2 c bus together with other i 2 c compliant devices. soldering considerations convection heating is recommended for reflow soldering; direct-infrared heating is not recommended. the plastic odfn package does not require a custom reflow soldering profile; it is qualified to +260c. a standard reflow soldering profile with a +260c maximum is recommended. als sensor window layout special care should be taken to ensure that the sensor, as shown in the sensor location outline (figure 6), is uniformly illuminated. shadows from off-angle window openings can affect uniform illumination, which in turn can affect measurement results. table 8. integration time of n-bit adc r ext (k ? ) n = 16-bit (ms) n = 12-bit (ms) n = 8-bit (s) n = 4-bit (s) 499 100 6.25 391 24 1000 200 12.5 782 48 (eq. 5) range 499k r ext ------------------ - range k () = (eq. 6) f osc 499k r ext ------------------ - 655 khz = data ir e ir = (eq. 7)
ISL29033 11 fn7656.2 february 25, 2013 figure 5. ISL29033 typical circuit vdd 1 gnd 2 rext 3 int 4 scl 5 sda 6 ISL29033 r1 10k r2 10k r ext 499k ? c2 0.1f c1 1f 2.25v to 3.63v microcontroller sda scl i 2 c slave_0 i 2 c slave_1 i 2 c slave_n i 2 c master scl sda scl sda 1.7v to 3.63v r3 res1 int figure 6. 6 ld odfn sensor location outline 1 3 4 6 2 5 sensor offset 0.54 0.37 0.40
ISL29033 12 fn7656.2 february 25, 2013 typical performance curves v dd = 3.0v, r ext = 499k ? figure 7. spectrum of four light sources normalized by luminous intensity (lux) figure 8. normalized spectral response for ambient light sensing figure 9. angular sensitivity figure 10. linearity over range 1 figure 11. low lux at green led (500k ? ) figure 12. light sources at range 1, 500k ? r ext 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 350 550 750 950 wavelength (nm) normalized intensity fluorescent sun incandescent halogen 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 300 400 500 600 700 800 900 1000 1100 wavelength (nm) normalized response als human eye ir sensing 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -90 -75 -60 -45 -30 -15 0 15 30 45 60 75 90 angular offset () normalized sensitivity 5 4 3 2 1 0 -1 -2 -3 -4 -5 error percent full scale (%) 0 20406080100120 lux meter (lux) max min 20 18 16 14 12 10 8 6 4 2 0 adc reading (counts) lux meter (lux) 0 0.005 0.01 0.015 0.02 500k ? 70000 60000 50000 40000 30000 20000 10000 0 0 102030405060708090100 lux reading (lux) adc reading (counts) fluorescent light incandescent light halogen
ISL29033 13 fn7656.2 february 25, 2013 figure 13. 500k ? als count, 30 lux normalized figure 14. low lux at green led (1m ? ) figure 15. light sources at range 1, 1m ? r ext figure 16. 1m ? als counts, 30 lux normalized figure 17. supply current vs v dd als sensing typical performance curves v dd = 3.0v, r ext = 499k ? (continued) als output change from +25c measurement (%) -60 0 60 100 temperature (c) -40 -20 20 80 40 10 6 2 -2 -6 -10 500k, 30lux normalized 8 4 0 -4 -8 45 40 35 30 25 20 15 10 5 0 adc reading (counts) lux meter (lux) 0 0.005 0.010 0.015 0.020 1m ? 70000 60000 50000 40000 30000 20000 10000 0 0 1020304050 lux reading (lux) adc reading (counts) incandescent light halogen fluorescent light als output change from +25c measurement (%) temperature (c) 1m, 20 lux normalized -60 0 60 100 -40 -20 20 80 40 10 6 2 -2 -6 -10 8 4 0 -4 -8 90 80 70 60 50 40 30 20 10 0 i dd (a) v dd (v) 2.25 2.75 3.25 3.75 1m ? 500k ?
ISL29033 14 intersil products are manufactured, assembled and tested utilizing iso9001 quality systems as noted in the quality certifications found at www.intersil.com/design/quality intersil products are sold by description only. intersil corporat ion reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnished by intersil is believed to be accurate and reliable. however, no responsi bility is assumed by intersil or its subsid iaries for its use; nor for any infringem ents of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of i ntersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com fn7656.2 february 25, 2013 for additional products, see www.intersil.com/product_tree about intersil intersil corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management semiconductors. the company's products addr ess some of the largest markets within th e industrial and infr astructure, personal computing and high-end consumer markets. for more information about intersil, visit our website at www.intersil.com . for the most updated datasheet, application notes, related documentatio n and related parts, please see the respective product information page found at www.intersil.com . you may report errors or suggestions fo r improving this datasheet by visiting www.intersil.com/en/support/ask-an-expert.html . reliability reports are also available from our website at http://www.intersil.com/en/support/q ualandreliability.html#reliability revision history the revision history provided is for informational purposes only and is believed to be accurate, but not warranted. please go t o web to make sure you have the latest rev. date revision change september 26, 2012 fn7656.2 corrected horizont al axis in figure 9, ?angular sensitivit y,? on page 12 from 0 to 40 to -90 to 90. september 21, 2011 fn7656.1 changed title on page 1 from ?integrate d digital ambient light sensor with interrupt function? to ?ul tra-low lux, low power, integrated digital ambien t light sensor with interrupt function? august 25, 2011 fn7656.0 initial release
ISL29033 15 fn7656.2 february 25, 2013 package outline drawing l6.2x2.1 6 lead optical dual flat no-lead plastic package (odfn) rev 3, 5/11 located within the zone indicated. the pin #1 identifier may be unless otherwise specified, tolerance : decimal 0.05 tiebar shown (if present) is a non-functional feature. the configuration of the pin #1 id entifier is optional, but must be between 0.15mm and 0.30mm from the terminal tip. dimension applies to the metallized terminal and is measured dimensions in ( ) for reference only. dimensioning and tolerancing conform to asme y14.5m-1994. 6. either a mold or mark feature. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: bottom view detail "x" side view typical recommended land pattern top view (4x) 0.10 index area pin 1 a b pin #1 b 0.10 ma c c seating plane base plane 0.08 0.10 see detail "x" c c 0 . 00 min. 0 . 05 max. 0 . 2 ref c 5 1 6 6 2.10 2.00 2.10 2.50 (1.35) (6x0.30) 0.65 (6x0.55) (6x0.20) (4x0.65) 1.30 ref 1.35 0.65 0.65 6x0.35 0.05 package 6x 0.300.05 index area outline 4 max 0.75

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