Maxim Announces MAX44000 Optical Sensor

Published:2012/1/4 1:22:00 Author:Amy From:SeekIC

Maxim Integrated Products introduces the MAX44000, a digital ambient-light and infrared proximity sensor that detects light. Using the proprietary BiCMOS technology, this IC adopts three optical sensors, two ADCs, and digital functionality into a tiny 2mm x 2mm x 0.6mm package. This integration saves valuable board space while delivering optical fusion and unparalleled light-sensing performance.

The MAX44000 consumes only 5µA when the ambient sensor is activated and only 7µA when both the proximity sensor and ambient light sensor are activated. The MAX44000 is ideal for touch-screen applications, including smartphones, portable devices, industrial sensors, and presence detection.

When a smartphone is brought up to a user’s face, the touch screen must be shut off to prevent inadvertent touches that may disrupt the call. Thus a proximity sensor is crucial, so the phone can “sense” an object is within a certain distance during a call or any other preset event. Once a sensed signal is received, it is run through a DC ambient, infrared (IR) rejection front-end circuit and sent to an ADC. This process allows the MAX44000 to operate in the presence of large amounts of DC IR radiation. With a single-pulse technique for pulsing the external IR LED, the sensor is immune to fixed-frequency external IR radiation.

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