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1 low power ambient light and proximity sensor with intelligent interrupt and sleep modes - analog and digital out ISL29030A the ISL29030A is an integrated ambient and infrared light-to-digital converter with a built-in ir led driver and i 2 c interface (smbus compatible). this device uses two independent adcs for concurre ntly measuring ambient light and proximity in parallel. the flexible interrupt scheme is designed for minimal microcontroller utilization. for ambient light sensor (als) data conversions, an adc converts photodiode current (wit h a light sensitivity range of 2000 lux) in 100ms per sample. the adc rejects 50hz/60hz flicker noise caused by artificial light sources. the i als pin provides an analog output current proportional to the measured light (420 a fsr). for proximity sensor (prox) data conversions, the built-in driver turns on an external infrared led, and the proximity sensor adc converts the reflected ir intensity to digital. this adc rejects ambient ir noise (suc h as sunlight) and has a 540 s conversion time. the ISL29030A provides low-power operation of the als and proximity sensing, with a typical 138 a normal operation current (110 a for sensors and internal circuitry; ~28 a for external led, with 220ma current pulses for a net 100 s, repeating every 800ms or under). the ISL29030A uses both a hardwa re pin and software bits to indicate an interrupt event has occurred. an als interrupt is defined as a measurement that is outside a set window. a proximity interrupt is defined as a measurement over a threshold limit. the user can co nfigure the device so that als and proximity interrupts occur simultaneously, up to 16 times in a row, before the interrupt pin is activated. the ISL29030A is designed to oper ate at 2.25v to 3.63v over the -40c to +85c ambient temperature range. it is packaged in a clear, lead-free 8 lead odfn package. pin configuration ISL29030A 8 ld odfn (2.0x2.1x0.7mm) top view features ? works under all light sources including sunlight ? dual adcs measure als/prox concurrently ? intelligent interrupt scheme simplifies microcontroller code ambient light sensing ? simple output code directly proportional to lux ? 50hz/60hz flicker noise and ir rejection ? light sensor close to human eye response ? selectable 125/2000 lux range ?analog 420 a output pin i als proportional to lux proximity sensing ? proximity sensor with broad ir spectrum - can use 850nm and 950nm external ir leds ? ir led driver with i 2 c programmable sink currents -net 100 s pulse with 110ma or 220ma amplitudes - periodic sleep time up to 800ms between pulses ? ambient ir noise cancelation (including sunlight) intelligent and flexible interrupts ? independent als/prox interrupt thresholds ? adjustable interrupt persistency - 1/4/8/16 consecutive triggers required before interrupt ultra low power ?138 a dc typical supply current for als/prox sensing -110 a for sensors and internal circuitry -28 a typical current for extern al ir led (assuming 220ma for 100 s every 800ms) ?<1.0 a supply current when powered down easy to use ? set registers; wait for interrupt ?i 2 c (smbus compatible) output ? temperature compensated ? tiny odfn8 2.0x2.1x0.7 (mm) package additional features ? 1.7v to 3.63v supply for i 2 c interface ? 2.25v to 3.63v sensor power supply ? pb-free (rohs compliant) applications ? display and keypad dimming adjustment and proximity sensing for: - mobile devices: smart phone, pda, gps - computing devices: laptop pc, netbook - consumer devices: lcd-tv, digital picture frame, digital camera ? industrial and medical light and proximity sensing 1 2 3 8 7 6 i als vdd gnd irdr int sda 4 5 rext scl thermal pad *thermal pad can be connected to gnd or electrically isolated caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas inc. 2010, 2011. all rights reserved intersil (and design) is a trademark owned by intersil corporation or one of its subsidiaries. all other trademarks mentioned are the property of their respective owners. march 31, 2011 fn7722.1
ISL29030A 2 fn7722.1 march 31, 2011 block diagram pin descriptions pin number pin name description 0 t.pad thermal pad (connect to gnd or float) 1i als analog current output (proportiona l to als/ir data count: 420a fsr) 2 vdd positive supply: 2.25v to 3.63v 3gndground 4 rext external resistor (499 k ; 1%) connects this pin to ground 5scli 2 c clock line the i 2 c bus lines can be pulled from 1.7v to above v dd ; 3.63v max 6sdai 2 c data line 7int interrupt pin; logic output (open-drain) for interrupt 8 irdr ir led driver pin; current flows into ISL29030A from led cathode vdd rext gnd scl ir photodiode light data 4 3 5 2 fosc iref irdr array als photodiode process als and ir array dual channel adcs 8 int 7 command register data register i 2 c ir driver interrupt sda 6 1 i als dac ordering information part number (notes 1, 2, 3) temp. range (c) package tape and reel (pb-free) pkg. dwg. # ISL29030Airoz-t7 -40 to +85 8 ld odfn l8.2.1x2.0 ISL29030Airoz-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, whic h is rohs compliant and compatible with bo th snpb and pb-free soldering operations. intersil pb-free products are msl classified at pb-free peak reflow temperatures th at 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 ISL29030A . for more information on msl please see techbrief tb477 .
ISL29030A 3 fn7722.1 march 31, 2011 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). . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to 4.0v i 2 c bus pin current (scl, sda). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10ma r ext pin voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5v to vdd + 0.5v irdr pin voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.5v i als pin voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5v to vdd + 0.5v int pin voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to 4.0v int pin current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10ma esd rating human body model (note 5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kv thermal resistance (typical, note 4) ja (c/w) 8 ld odfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 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. notes: 4. 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 tb379 . 5. esd on all pins is 2kv, except for irdr, which is 1.5kv. electrical specifications v dd = 3.0v, t a = +25c, r ext = 499k ? 1% tolerance. boldface limits apply over the operating temperature range, -40c to +85c. parameter description condition min (note 6) typ max (note 6) unit v dd power supply range 2.25 3.0 3.63 v sr_v dd input power-up slew rate v dd rising edge between 0.4v and 2.25v 0.5 v/ms i dd_off supply current when powered down als_en = 0; prox_en = 0 0.1 0.8 a i dd_norm supply current for als+prox in sleep time als_en = 1; prox_en = 1 116 135 a i dd_prx_slp supply current for prox in sleep time als_en = 0; prox_en = 1 85 a i dd_als supply current for als als_en = 1; prox_en = 0 102 a f osc internal oscillator frequency 5.25 mhz t intgr_als 12-bit als integration/conversion time 88 100 112 ms t intgr_prox 8-bit prox integration/conversion time 0.54 ms i als_off i als output current when als = disabled als_en = 0; v i_als = 0v 3 100 na i als_0 i als output current when dark als_en = 1; als_range = 1; e = 0 lux 0.1 0.6 a i als_1 current output under specified conditions e = 53 lux, fluorescent (note 7), als_range = 0 161 a i als_2 current output under specified conditions e = 320 lux, fluorescent (note 7) als_range = 1 40 60 80 a i als_f i als output current at full scale als_en = 1; als code = 4095 380 420 460 a v i_als compliance voltage on i als w/ 5% variation in output current als_en = 1; als code = 4095 0 vdd-0.8 v data als_0 als result when dark e ambient = 0 lux, 2k range 1 3 counts data als_f full scale als adc code e ambient > selected range maximum lux (note 10) 4095 counts data data count output variation over three light sources: fluorescent, incandescent and sunlight ambient light sensing 10 % data als_1 light count output with lsb of 0.0326 lux/count e = 53 lux, fluorescent (notes 7, 10), als_range = 0 1638 counts data als_2 light count output with lsb of 0.522 lux/count e = 320 lux, fluorescent (note 7) als_range = 1 460 614 768 counts
ISL29030A 4 fn7722.1 march 31, 2011 data prox_0 prox measurement w/o object in path 1 2 counts data prox_f full scale prox adc code 255 counts data prox_1 prox measurement result (note 8) 35 46 57 counts t r rise time for ir dr sink current r load = 15 at irdr pin, 20% to 80% 500 ns t f fall time for ir dr sink current r load = 15 at irdr pin, 80% to 20% 500 ns i irdr_0 irdr sink current prox_dr = 0; v irdr = 0.5v 98 110 120 ma i irdr_1 irdr sink current prox_dr = 1; v irdr = 0.5v 220 ma i irdr_leak irdr leakage current prox_en = 0; v dd = 3.63v (note 9) -1 0.001 1 a v irdr acceptable voltage range on irdr pin register bit prox_dr = 0 0.5 4.3 v t pulse net i irdr on time per prox reading 100 s v ref voltage of r ext pin 0.51 v f i 2 c i 2 c clock rate range 400 khz v i 2 c supply voltage range for i 2 c interface 1.7 3.63 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 3 5ma i int int current sinking capability v ol = 0.4v 3 5ma psrr irdr ( i irdr )/( v irdr ) prox_dr = 0; v irdr = 0.5v to 4.3v 4 ma/v notes: 6. compliance to datasheet limits is assu red by one or more methods: production test, characterization and/or design. 7. an led is used in production test. the led irradiance is calibrated to produce the same data count against a fluorescent ligh t source of the same lux level. 8. an 850nm infrared led is used to test pr ox/ir sensitivity in an internal test mode. 9. ability to guarantee i irdr leakage of ~1na is limited by test hardware. 10. for als applications under light-distorting glass, please see ?als range 1 considerations? on page 10. electrical specifications v dd = 3.0v, t a = +25c, r ext = 499k ? 1% tolerance. boldface limits apply over the operating temperature range, -40c to +85c. (continued) parameter description condition min (note 6) typ max (note 6) unit i 2 c electrical specifications for scl and sda unless otherwise noted, v dd = 3v, t a = +25c, r ext = 499k ? 1% tolerance (note 11 ). boldface limits apply over the operating temperature range, -40c to +85c. parameter description condition min typ max unit v i 2 c 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
ISL29030A 5 fn7722.1 march 31, 2011 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 vdd crossing 1300 ns t high high period of the scl clock 600 ns t su:sta set-up time for a repe ated 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 12) 20 + 0.1xc b ns t f fall time of both sda and scl signals (note 12) 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 1 k 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 notes: 11. i 2 c limits are based on design/simulat ion and are not production tested. 12. c b is the capacitance of the bus in pf. i 2 c electrical specifications for scl and sda unless otherwise noted, v dd = 3v, t a = +25c, r ext = 499k ? 1% tolerance (note 11 ). boldface limits apply over the operating temperature range, -40c to +85c. (continued) parameter description condition min typ max unit figure 1. i 2 c timing diagram
ISL29030A 6 fn7722.1 march 31, 2011 register map there are ten 8-bit regi sters accessible via i 2 c. registers 0x1 and 0x2 define the operation mode of the device. registers 0x3 through 0x7 store the various als/ir/prox thresholds which trigger interrupt events. registers 0x8 through 0xa store the results of als/ir/ prox adc conversions. register descriptions table 1. ISL29030A registers and register bits addr reg name bit 7654321 0default 0x00 (n/a) (reserved) (n/a) 0x01 configure prox_en prox_slp[2:0] prox_dr als_en als_range alsir_mode 0x00 0x02 interrupt prox_flag prox_prst[1:0] (wri te 0) als_flag als_prst[1:0] int_ctrl 0x00 0x03 prox_lt prox_lt[7:0] 0x00 0x04 prox_ht prox_ht[7:0] 0xff 0x05 alsir_th1 alsir_lt[7:0] 0x00 0x06 alsir_th2 alsir_ht[3:0] alsir_lt[11:8] 0xf0 0x07 alsir_th3 alsir_ht[11:4] 0xff 0x08 prox_data prox_data[7:0] 0x00 0x09 alsir_dt1 alsir_data[7:0] 0x00 0x0a alsir_dt2 (unused) alsir_data[11:8] 0x00 0x0e test1 (write as 0x00) 0x00 0x0f test2 (write as 0x00) 0x00 table 2. register 0x00 (reserved) bit # access default name function/operation 7:0 (n/a) (n/a) (n/a) reserved - no need to read or write table 3. register 0x01 (configure) - prox/als configuration bit # access default name function/operation 7rw 0x00 prox_en (prox enable) when = 0, proximity sensing is disabled when = 1, continuous proximity sensing is enabled. prox data will be ready 0.54ms after this bit is set high 6:4 rw 0x00 prox_slp (prox sleep) for bits 6:4 = (see the following) 111; sleep time between prox ir led pulses is 0.0ms (run continuously) 110; sleep time between prox ir led pulses is 12.5ms 101; sleep time between prox ir led pulses is 50ms 100; sleep time between prox ir led pulses is 75ms 011; sleep time between prox ir led pulses is 100ms 010; sleep time between prox ir led pulses is 200ms 001; sleep time between prox ir led pulses is 400ms 000; sleep time between prox ir led pulses is 800ms 3rw 0x00prox_dr (prox drive) when = 0, irdr behaves as a pulsed 110ma current sink when = 1, irdr behaves as a pulsed 220ma current sink 2rw 0x00 als_en (als enable) when = 0, als/ir sensing is disabled when = 1, continuous als/ir sensing is enabled with new data ready every 100ms 1rw 0x00als_range (als range) when = 0, als is in low-lux range when = 1, als is in high-lux range 0rw 0x00alsir_mode (alsir mode) when = 0, als/ir data register contains visible als sensing data when = 1, als/ir data register contains ir spectrum sensing data
ISL29030A 7 fn7722.1 march 31, 2011 table 4. register 0x02 (interrupt ) - prox/als interrupt control bit # access default bit name function/operation 7flag 0x00 prox_flag (prox flag) when = 0, no prox interrupt event has occurred since power-on or last ?clear? when = 1, a prox interrupt event occurred. clearable by writing ?0? 6:5 rw 0x00 prox_prst (prox persist) for bits 6:5 = (see the following) 00; set prox_flag if 1 conversion result trips the threshold value 01; set prox_flag if 4 conversion results trip the threshold value 10; set prox_flag if 8 conversion results trip the threshold value 11; set prox_flag if 16 conversion results trip the threshold value 4rw 0x00 unused (write 0) unused register bit - write 0 3 flag 0x00 als_flag (als flag) when = 0, no als interrupt event has occurred since power-on or last ?clear? when = 1, an als interrupt event occurred. clearable by writing ?0? 2:1 rw 0x00 als_prst (als persist) for bits 2:1 = (see the following) 00; set als_flag if 1 conversi on is outside the set window 01; set als_flag if 4 conversions are outside the set window 10; set als_flag if 8 conversions are outside the set window 11; set als_flag if 16 conversions are outside the set window 0rw 0x00 int_ctrl (interrupt control) when = 0, set int pin low if prox_flag or als_flag high (logical or) when = 1, set int pin low if prox_flag and als_flag high (logical and) table 5. register 0x03 (prox_lt) - interrupt low threshold for proximity sensor bit # access default bit name function/operation 7:0 rw 0x00 prox_lt (prox threshold) 8-bit interrupt low threshold for proximity sensing table 6. register 0x04 (prox_ht) - interrupt high threshold for proximity sensor bit # access default bit name function/operation 7:0 rw 0xff prox_ht (prox threshold) 8-bit interrupt high threshold for proximity sensing table 7. register 0x05 (alsir_th1) - interrupt low threshold for als/ir bit # access default bit name function/operation 7:0 rw 0x00 alsir_lt[7:0] (als/ir low thr.) lower 8 bits (of 12 bits) for als/ir low interrupt threshold table 8. register 0x06 (alsir_th2) - interrupt low/high thresholds for als/ir bit # access default bit name function/operation 7:4 rw 0x0f alsir_ht[3:0] (als/ir high thr.) lower 4 bits (of 12 bits) for al s/ir high interrupt threshold 3:0 rw 0x00 alsir_lt[11:8] (als/ir low thr.) upper 4 bits (of 12 bits) for als/ir low interrupt threshold table 9. register 0x07 (alsir_th3) - interrupt high threshold for als/ir bit # access default bit name function/operation 7:0 rw 0xff alsir_ht[11:4] (als/ir high thr.) upper 8 bits (of 12 bits) for al s/ir high interrupt threshold
ISL29030A 8 fn7722.1 march 31, 2011 table 10. register 0x08 (prox_data) - proximity sensor data bit # access default bit name function/operation 7:0 ro 0x00 prox_data (proximity data) results of 8-bit proximity sensor adc conversion table 11. register 0x09 (alsir_dt1) - als/ir sensor data (lower 8 bits) bit # access default bit name function/operation 7:0 ro 0x00 alsir_data (als/ir data) lower 8 bits (of 12 bits) from result of als/ir sensor conversion table 12. register 0x0a (alsir_dt2) - als/ir sensor data (upper 4 bits) bit # access default bit name function/operation 7:4 ro 0x00 ( unused )unused bits. 3:0 ro 0x00 alsir_data (als/ir data) upper 4 bits (of 12 bits) from result of als/ir sensor conversion table 13. register 0x0e (test1) - test mode bit # access default bit name function/operation 7:0 rw 0x00 (write as 0x00) test mode regi ster. when 0x00, in normal operation. table 14. register 0x0f (test2) - test mode 2 bit # access default bit name function/operation 7:0 rw 0x00 (write as 0x00) test mode regi ster. when 0x00, in normal operation. figure 2. i 2 c driver timing diagram for master and slave connected to common bus 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 a d7 d6d5d4 d3d2 d1d0 1357 1357 123456 9246 stop start sda driven by master device address sda driven by ISL29030A data byte0 register address slave 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 master (ISL29030A)
ISL29030A 9 fn7722.1 march 31, 2011 principles of operation i 2 c interface the ISL29030A i 2 c interface slave address is internally hardwired as 0b1000100. figure 2 shows a sample one-byte read. 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 first transmitted byte is initiated by the master and includes seven address bits and a r/w bit. the slave is responsible for pulling sda low during the ack bit after every transmitted byte. each i 2 c transaction ends with the master asserting a stop condition (sda rising wh ile scl remains high). for more information about the i 2 c standard, please consult the philips ? i 2 c specification documents. photodiodes and adcs the ISL29030A contains two phot odiode arrays that convert photons (light) into current. the als photodiodes are constructed to mimic the human eye wavelength response curve to visible light (see figure 7). the als photodiode current output is digitized by a 12-bit adc in 100ms. these 12 bits can be accessed by reading from i 2 c registers 0x9 and 0xa when the adc conversion is completed. the als converter is a charge-balan cing, integrating, 12-bit adc. charge-balancing is best for conver ting small current signals in the presence of periodic ac noise. in tegrating over 100ms highly rejects both 50hz and 60hz light flicker by picking the lowest-integer number of cycles for both 50hz/60hz frequencies. the proximity sensor is an 8-bit adc that operates in a similar fashion. when proximity sensing is enabled, the irdr pin drives a user-supplied infrared led, the emitted ir reflects off an object (i.e., a human head) back into the ISL29030A, and a sensor converts the reflected ir wave to a current signal in 0.54ms. the adc subtracts the ir reading before and after the led is driven (to remove ambient ir such as sunlight) and converts this value to a digital count stored in register 0x8. the ISL29030A is designed to ru n two conversions concurrently: a proximity conversion, and an als (or ir) conversion. please note that because of the conversion times, the user must let the adcs perform one full conversion first before reading from i 2 c registers prox_data (wait 0.54ms) or alsir_dt1/2 (wait 100ms). the timing between als and prox conversions is arbitrary, as shown in figure 3. the als runs continuously, with new data available every 100ms. the proximity sensor runs continuously, with a time between conversions decided by prox_slp (register 1 bits [6:4]). ambient light and ir sensing the ISL29030A is set for ambient light sensing when register bit alsir_mode = 0 and alr_en = 1. th e light-wavelength response of the als appears as shown in figu re 6. als measuring mode (as opposed to ir measuring mode) is set by default. when the part is programmed for infrared (ir) sensing (alsir_mode = 1; als_en = 1), infr ared light is converted into a current and is digitized by the same als adc. the result of an ir conversion is strongly related to the amount of ir energy incident on the sensor, but it is unitless and is referred to in digital counts. proximity sensing when proximity sensing is enabled (prox_en = 1), the external ir led is driven through the irdr pin for 0.1ms by the built-in ir led driver. the amplitude of the ir led current depends on register 1 bit 3: prox_dr. if this bit is low, the load sees a fixed als active 100ms 100ms 100ms prox sensor active irdr (current driver) als conversion time = 100ms (fixed) 0.54ms for prox conversion series of current pulses totaling 0.1ms sleep time (prox_slp) 100ms 100ms several s between conversions time time time figure 3. timing diagram for prox/als events - not to scale
ISL29030A 10 fn7722.1 march 31, 2011 110ma current pulse. if this bit is high, the load on irdr sees a fixed 220ma current pulse, as shown in figure 4. when the ir from the led reache s an object and gets reflected back into the ISL29030A, the reflected ir light is converted into current, as shown by the ir spectr al response in figure 7. one entire proximity measurement takes 0.54ms for one conversion (which includes 0.1ms spent dr iving the led), and the period between proximity measurements is decided by prox_slp (sleep time) in register 1 bits 6:4. average led driving current consumption is given by equation 1. a typical irdr scheme is 220m a amplitude pulses every 800ms, which yields 28 a dc. total current consumption total current consumption is the sum of i dd and i irdr . the irdr pin sinks current (as shown in fi gure 4), and the average irdr current can be calculated using equation 1. i dd depends on voltage and the mode of operat ion, as shown in figure 11. interrupt function the ISL29030A has an intelligent interrupt scheme designed to shift some logic processing away from intensive microcontroller i 2 c polling routines (which consume power) and toward a more independent light sensor that can instruct a system to ?wake up? or ?go to sleep.? an als interrupt event (als_flag) is governed by registers 5 through 7. the user writes high and low threshold values to these registers, and the ISL29030A issues an als interrupt flag if the actual counts stored in registers 0x9 and 0xa are outside the user-programmed window. the user must write 0 to clear the als_flag. a proximity interrupt event (prox_flag) is governed by the high and low thresholds in registers 3 and 4 (prox_lt and prox_ht). prox_flag is set when the measured proximity data is greater than the high threshold a user-specified consecutive number of times (x; set by the user; see next paragraph). the proximity interrupt flag is cleared when the proximity data is lower than the low proximity thre shold x consecutive times, or when the user writes ?0? to prox_flag. interrupt persistency is another useful option available for both als and proximity measurements. persistency requires a user- specified number (x) of consecutive interrupt flags before the int pin is driven low. both als and prox have their own independent interrupt persistency options. see als_prst and prox_prst bits in register 2. the final interrupt option is the ability to and or or the two interrupt flags using register 2 bit 0 (int_ctrl). if the user wants simultaneous als and prox interrupts to happen before changing the state of the interrupt pin, the user sets this bit high. if the user wants the interrupt pin to change state when either the als or the proximity interrupt flag goes high, the user leaves this bit at its default value of 0. analog-out i als pin when als_en = 1, the analog i als output pin sources a current directly proportional to the digita l count stored in register bits alsirdata[11:0]. when als_en = 0, this pin is in a high impedance state. see figure 15 fo r the effects of the compliance voltage (v i_als ) on i als . als range 1 considerations when measuring als counts higher than 1800 on range 1 (alsir_mode = 0, als_range = 0, als_data > 1800), the user must switch to range 2 (change the als_range bit from 0 to 1) and re-measure als counts. this recommendation pertains only to applications where the light incident upon 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 at 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 the factory specification (2.25v to 3.63v), intersil recommends the user write the following: 0x00 to register 0x01, 0x29 to register 0x0f, 0x00 to register 0x0e, and 0x00 to register 0x0f. the user should then wait ~1ms or more and then rewrite all registers to the desired values. if the user prefers a hardware reset method instead of writing to test registers, then set v dd =0v for 1 second or more, power up again at the required slew rate, and write the desired values to the registers. power-down the user can set power-down in two ways. the first is to set both prox_en and als_en bits to 0 in register 1. the second and more simple way is to set all bits in register 1 to 0 (0x00). calculating lux when in als mode, the ISL29030A adc output codes are directly proportional to lux (see alsir_mode bit). in equation 2, e calc is the calculated lux reading, and out represents the adc code. the constant, , which is to plug in, is determined by the range bit, als_range (register 0x1 bit 1) and is independent of the light source type. figure 4. current drive mode options pin 8 - irdr 220ma (prox_dr = 1) (irdr is hi-z when not driving) 110ma (prox_dr = 0) i lrdr avg () i lrdr peak () 100 s t sleep 540 s + -------------------------------------------------------- = (eq. 1) e calc range out adc = (eq. 2)
ISL29030A 11 fn7722.1 march 31, 2011 table 15 shows two different scale factors: one for the low range (als_range = 0) and the other for the high range (als_range = 1). noise rejection charge balancing adcs have excellent noise-rejection characteristics for periodic noise sources for which frequency is an integer multiple of the conversion rate. for instance, 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. since wall sockets may output at 60hz or 50hz, the factory-set integration time is 100ms, which is the lowest common integer number of cycles for both frequencies. proximity detection of various objects proximity sensing relies on the amount of ir reflected back from objects. a perfectly black object absorbs all light and reflects no photons. the ISL29030A is sensit ive enough to detect black esd foam, which reflects only 1% of ir . for biological objects, blonde hair reflects more than brown hair, and customers may notice that skin tissue is much more reflective than hair. ir penetrates into the skin and is reflected or scattered back from within. as a result, the proximity count peaks at cont act and monotonically decreases as skin moves away. the reflective characteristics of skin are very different from that of paper. typical circuit a typical application for the isl 29030a is shown in figure 5. the ISL29030A i 2 c address is internally hardwired as 0b1000100. the device can be tied onto a system 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 recommen ded. the plastic odfn package does not require a custom reflow soldering profile, and is qualified to +260c. a standard reflow soldering profile with a +260c maximum is recommended. suggested pcb footprint it is important that users see tb477 , ?surface mount assembly guidelines for optical dual flat pack no lead (odfn) package? before starting odfn product board mounting. layout considerations the ISL29030A is relatively insensitive to layout. like other i 2 c devices, it is intended to provide excellent performance, even in significantly noisy environments. to ensure best performance, route the supply and i 2 c traces as far as possible from all sources of noise, and place a 0.1f and 1f power supply decoupling capacitor close to the device. als sensor window layout special care should be taken to ensure that the sensor is uniformly illuminated, as shown in figure 16, ?8 ld odfn sensor location outline - dimensions in mm?. shadows from window openings that affect uniform illumination can distort measurement results. table 15. als sensitivity at different ranges als_range range (lux/count) 0 0.0326 1 0.522 i als 1 gnd 3 rext 4 sda int 7 irdr 8 ISL29030A r1 10k ? r2 10k ? rext 499k ? v dd microcontroller int sda slave_0 slave_1 i 2 c slave_n i 2 c master scl sda scl sda v i2c_pull-up 6 r3 10k ? scl 2 vdd 5 c2 0.1f figure 5. ISL29030A typical circuit scl c1 1f v ir-led v 3.5k ?
ISL29030A 12 fn7722.1 march 31, 2011 typical performance curves v dd = 3.0v, r ext = 499k figure 6. spectrum of four light sources normalized by luminous intensity (lux) figure 7. ISL29030A sensitivity to different wavelengths figure 8. angular sensitivity figure 9. als linearity over 3 light sources (2000 lux range) figure 10. prox counts vs distance with 10cm x 10cm reflector (using ISL29030A evaluation board) figure 11. v dd vs i dd for various modes of operation (i als pin floating) 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 incand. 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/prox 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -90 -60 -30 0 30 60 90 angular offset () normalized sensitivity 0 500 1000 1500 2000 2500 0 1000 2000 3000 4000 5000 als code (12-bit) fluorescent incandescent lux meter reading (lx) halogen 0 50 100 150 200 250 300 0 20 40 60 80 100 120 140 160 180 200 distance (mm) prox counts (8-bit) white copy paper 220ma mode 18% gray card 110ma mode 40 60 80 100 120 140 160 2.25 2.40 2.55 2.85 3.00 3.15 3.45 input v dd (v) measured i dd (a) als+prox (during prox sleep) als-only 3.60 3.30 2.70 prox (during prox sleep)
ISL29030A 13 fn7722.1 march 31, 2011 figure 12. irdr pulse amplitude vs v irdr figure 13. stability of als count over-temperature (at 300 lux) figure 14. stability of als count over-temperature (at 0.00 lux) figure 15. compliance voltage (v i_als ) effects on i als (referenced to v i_als = 0v) typical performance curves v dd = 3.0v, r ext = 499k (continued) 100 120 140 160 180 200 220 240 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 220ma-mode (prox_dr = 1) 110ma-mode (prox_dr = 0) v irdr (v) i irdr (ma) temperature (c) als count change -50 -30 -10 10 30 50 -40 -20 0 20 40 60 80 from +25c (%) 40 20 0 -20 -40 0 1 2 3 4 5 6 7 8 9 -40 10 60 temperature (c) als code (12-bit) 10 0 20 40 60 80 100 0 0.5 1.0 1.5 2.0 2.5 3.0 v i_als (v) i als (%) i als (%)
ISL29030A 14 fn7722.1 march 31, 2011 figure 16. 8 ld odfn sensor location outline - dimensions in mm 2.00 sensor offset 0.43 0.50 2.10 1 2 3 4 8 7 6 5 0.42
ISL29030A 15 intersil products are manufactured, assembled and tested utilizing iso9000 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 fn7722.1 march 31, 2011 for additional products, see www.intersil.com/product_tree products intersil corporation is a leader in the design and manufacture of high-performance analog semico nductors. the company's product s address some of the industry's fastest growing markets, such as , flat panel displays, cell phones, handheld products, and noteb ooks. intersil's product families address power management and analog signal processing functions. go to www.intersil.com/products for a complete list of intersil product families. *for a complete listing of applications, related documentation an d related parts, please see the respective device information page on intersil.com: ISL29030A to report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff fits are available from our website at: http://rel.intersil.com/reports/sear revision history the revision history provided is for inform ational 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 3/18/2011 fn7722.1 page 7, table 2, changed access from ro to (n/a) page 10, eq. 1, added ?+ 540 s? to the divisor, t sleep . changed i irdr(ave) to i irdr(avg) . page 10, in ?als range 1 considerations?sectio n, removed reference to document of that title. page 11, added section, ?als sensor window layout? page 16, replaced package outline drawing rev 1, dated 12/09 with rev 3, dated 1/11. converted to latest intersil datasheet template 11/18/10 fn7722.0 initial release
ISL29030A 16 fn7722.1 march 31, 2011 package outline drawing l8.2.1x2.0 8 lead optical dual flat no-lead plastic package (odfn) rev 3, 1/11 8x 0 . 35 0 . 05 b 0.10 a c 0.200.05 0.75 0.50 1.50 1.50 m 0.25 0.15 located within the zone indicated. the pin #1 indentifier 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 0.25mm and 0.35mm 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: detail "x" side view typical recommended land pattern top view (2x) 0.10 index area pin 1 a b c seating plane base plane 0.08 0.10 see detail "x" c c 6 0 . 00 min. 0 . 05 max. 0 . 2 ref c 5 0.700.05 2.10 2.00 (6x0.50) (8x0.20) (8x0.55) (0.75) (1.50) 2.10 2.50 (8x0.20) bottom view index area pin 1 6 4

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