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Low Power Ambient Light and Proximity Sensor with

Intelligent Interrupt and Sleep Modes

ISL29029

The ISL29029 is an integrated ambient and infrared light-to-digital

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 540μs conversion

time.

The ISL29029 provides low power operation of ALS and PROX

sensing with a typical 138μA normal operation current (110μA for

sensors and internal circuitry, ~28μA for external LED) with 220mA

current pulses for a net 100μs, repeating every 800ms (or under).

The ISL29029 uses both a hardware pin and software bits to

indicate an interrupt event has occurred. An ALS or PROX

interrupt is defined as a measurement which is outside a set

window. 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 ISL29029 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 lead ODFN package.

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

Features

• Works Under All Light Sources Including Sunlight

• Dual ADCs Measure ALS/Prox Concurrently

• Intelligent Interrupt Scheme Simplifies μC Code

•0.5% Typical Nonlinearity

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

Proximity Sensing

• Proximity Sensor with Broad IR Spectrum

- Can Use 850nm and 950nm External IR LEDs

-Net 100μs Pulse with 110mA or 220mA Amplitudes

- Periodic Sleep Time up to 800ms Between Pulses

• Ambient IR Noise Cancellation (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

•138μA DC Typical Supply Current for ALS/Prox Sensing

-110μA for Sensors and Internal Circuitry

-28μA Typical Current for External IR LED (Assuming 220mA

for 100μs Every 800ms)

•<1.0μA Supply Current When Powered Down

Easy to Use

• Set Registers; Wait for Interrupt

• Temperature Compensated

• Tiny ODFN8 2.0x2.1x0.7 (mm) Package

Additional Features

• 2.25V to 3.63V Sensor Power Supply

• Pb-Free (RoHS compliant)

November 23, 2010

FN7682.0

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

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