ISL29044A

Low Power Ambient Light and Proximity Sensor with Internal IR-LED and Digital Output

Product Status: Mass Production

OVERVIEW

The ISL29044A is an integrated ambient and infrared light-to-digital converter with a built-in IR LED and I2 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 intensity to digital. This ADC rejects ambient IR noise (such as sunlight) and has a 547μs conversion time.

The ISL29044A provides low power operation of ALS and proximity sensing with a typical 133μA normal operation current (108μA for sensors and internal circuitry, ~25μA for LED) with 220mA current pulses for a net 100μs, repeating every 800ms (or under).

The ISL29044A uses both a hardware 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 also 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 -40°C to +85°C ambient temperature range. It is packaged in a clear, lead-free 8 Ld ODFN package.

KEY FEATURES

  • Internal LED + Sensor = complete solution
  • Works under all light sources including sunlight
  • Dual ADCs measure ALS/Prox concurrently
  • <1.0μA 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

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL29044A
Basic Information
Production Status
Mass Production
Peak Spectral Sensitivity
550 nm
VS (min)
2.25 V
VS (max)
3.63 V
ICC
94 µA
Resolution Bits
12
Lux Range (min) (lux)
0
Lux Range (max) (lux)
2000
Counts/Lux (max) (Counts)
2.048
Dark ADC Code @ Ev=0Lux (max) (Counts)
3
Gain Selection?
No
Qualification Level
Standard
Bus/Output Interface
I2C
Address Selection Pins?
No
Package Dimensions (mm)
2.36x3.94x1.35
Features
Internal LED + Sensor
Enable Pin?
Software Enabled
Temperature Range
-40 to +85

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