1 low power ambient light and proximity sensor with internal ir-led and digital output ISL29044A the ISL29044A is an integrated ambient and infrared light-to-digital converter with a built-in ir led and i 2 c interface (smbus compatible). this device uses two independent adcs for concurrently measuring ambient light and proximity in parallel. the flexible interrupt scheme is designed for minimal micro-controller utilization. for ambient light sensor (als) data conversions, an adc converts photodiode current (with a light sensitivity range up to 3200lux) in 100ms per sample. the adc rejects 50hz/60hz flicker noise caused by artificial light sources. for proximity sensor (prox) data conversions, the built-in driver turns on an internal infrared led and the proximity sensor adc converts the reflected ir intensit y to digital. this adc rejects ambient ir noise (such as sunlight) and has a 547 s conversion time. the ISL29044A provides low power operation of als and proximity sensing with a typical 133 a normal operation current (108 a for sensors and internal circuitry, ~25 a for led) with 220ma current pulses for a net 100 s, repeating every 800ms (or under). the ISL29044A 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 may al so require that both als/prox interrupts occur at once, up to 16 times in a row before activating the interrupt pin. the ISL29044A is designed to operate from 2.25v to 3.63v over the -40c to +85c ambient temperature range. it is packaged in a clear, le ad-free 8 ld odfn package. features ? internal led + sensor = complete solution ? works under all light sources including sunlight ? dual adcs measure als/prox concurrently ?<1.0 a supply current when powered down ? temperature compensated ? pb-free (rohs compliant) intelligent and flexible interrupts ? independent als/prox interrupt thresholds ? adjustable interrupt persistency - 1/4/8/16 consecutive triggers required before interrupt applications ? display and keypad dimmin g adjustment and proximity sensing for: - mobile devices: smart phone, pda, gps - computing devices: laptop pc, netbook, tablet pc - consumer devices: lcd-tv, digital picture frame, digital camera - industrial and medical light and proximity sensing related literature ? see an1436 , ?proximity sensors? figure 1. typical application led- 5 irdr 6 led+ 4 vdd 1 int 7 sda 8 gnd 3 scl 2 i 2 c slave 0 ISL29044A scl sda i 2 c slave 1 i 2 c-diagram scl sda i 2 c slave_n i 2 c-diagram int scl sda i 2 c master controller r1 res1 r2 res1 r3 res1 c1 0.1f c2 1f c3 0.1f v_led v_pullup vdd april 19, 2013 fn8419.1 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 2013. 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.
ISL29044A 2 intersil products are manufactured, assembled and tested utilizing iso9000 quality systems as noted in the quality certifications found at www.intersil.com/en/suppor t/qualandreliability.html 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 fn8419.1 april 19, 2013 for additional products, see www.intersil.com/en/products.html
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