ams TSL2671 Digital Proximity Detectors
ams TSL2671 Digital Proximity Detectors each provides a complete proximity detection system and digital interface logic in a single 6-pin package. ams TSL2671 Digital Proximity Detectors each includes a digital proximity sensor with integrated LED driver for the required external IR LED. The proximity function offers a wide range of performance, with four programmable LED drive currents and a pulse repetition range of 1 to 32 pulses. The proximity detection circuitry compensates for ambient light, allowing it to operate in environments ranging from bright sunlight to dark rooms. This wide dynamic range also allows operation in short-distance detection applications behind dark glass, such as cell phones. An internal state machine provides the ability to put the device into a low-power mode for very low average power consumption.
The proximity function specifically targets near-field proximity applications. In cell phones, for example, the proximity detection function can detect when the user positions the phone close to their ear. The device is fast enough to provide proximity information at the high repetition rate needed when answering a phone call. This provides both improved green power saving capability and the added security to lock the screen when the user may accidentally deploy a touch.