DATASHEET
ISL29028A
Low Power Ambient Light and Proximity Sensor with Intelligent Interrupt and
Sleep Modes
The ISL29028A is an integrated ambient and infrared light-todigital converter with a built-in IR LED driver and I2C 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
microcontroller utilization.
For ambient light sensor (ALS) data conversions, an ADC
converts photodiode current (with a light sensitivity range up to
2000 Lux) 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 external infrared LED and the proximity sensor
ADC converts the reflected IR intensity to digital. This ADC
rejects ambient IR noise (such as sunlight) and has a 540Ојs
conversion time.
The ISL29028A provides low power operation of ALS and
proximity sensing with a typical 138ОјA normal operation current
(110ОјA for sensors and internal circuitry, ~28ОјA for external LED)
with 220mA current pulses for a net 100Ојs, repeating every
800ms (or under). …
