Proximity Sensor with Intelligent Interrupt and Sleep Modes

The ISL29027 is an integrated infrared light-to-digital converter with a built-in IR LED driver and I2C Interface (SMBus Compatible). The flexible interrupt scheme is designed for minimal microcontroller utilization.

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.

Features

• Works Under All Light Sources Including Sunlight

• Intelligent Interrupt Scheme Simplifies μC Code

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

• Proximity Interrupt Thresholds

• Adjustable Interrupt Persistency

- 1/4/8/16 Consecutive Triggers Required Before Interrupt

Ultra Low Power

• 138μA DC Typical Supply Current for 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

- Mobile Devices: Smart Phone, PDA, GPS

- Computing Devices: Laptop PC, Netbook

- Consumer Devices: LCD-TV, Digital Picture Frame, Digital Camera