The TSL2771 family of devices provides both ambient light sensing (ALS) and proximity detection (when coupled with an external IR LED). The ALS approximates human eye response to light intensity under a variety of lighting conditions and through a variety of attenuation materials. The proximity detection feature allows a large dynamic range of operation for use in short distance detection behind dark glass such as in a cell phone or for longer distance measurements for applications such as presence detection for monitors or laptops. The programmable proximity detection enables continuous measurements across the entire range. In addition, an internal state machine provides the ability to put the device a low power mode in between ALS and proximity measurements providing very low average power consumption.
Product Features:
Ambient Light Sensing and Proximity Detection in Single Device
Programmable Analog Gain & Integration Time
Programmable Interrupt Function with Upper and Lower Threshold
Very High Sensitivity — Operates Well Behind Darkened Glass
Up to 1000000:1 Dynamic Range
Proximity Detection - Programmable Number of IR Pulses and Interrupt Function with Upper and Lower Threshold
Programmable Wait Timer - 2.72 ms to > 8 Seconds
I2C Interface Compatible - Up to 400 kHz (I2C Fast Mode) with Dedicated Interrupt Pin