Low Power Ambient Light and Proximity Sensor with Intelligent Interrupt and Sleep Modes

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

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

• IR LED Driver with I2C Programmable Sink Currents

- 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)

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Easy to Use

• Set Registers; Wait for Interrupt

• I2C (SMBus Compatible) Output

• Temperature Compensated

• Tiny ODFN8 2.0x2.1x0.7 (mm) Package

Additional Features

• 1.7V to 3.63V Supply for I2C Interface

• 2.25V to 3.63V Sensor Power Supply

• Pb-Free (RoHS compliant)

• I2C Address Selection Pin

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