APDS-9801 is a module that integrates functions of an Analog ambient light sensor (ALS) and a proximity sensor (PS). The sensor has four chips in one small package: an ambient light sensor IC, proximity sensor signal conditioning circuitry and a proximity sensor that includes both an emitter and detector. The Analog ambient light sensor has current output, with spectral response close to the CIE standard Photopic observer. The proximity sensor IC has a LED driver and receiver circuit with digital count output, featuring excellent ambient light cancellation capability. With the built-in LED, the proximity sensor is able to sense the proximity of an object, such as finger or head to a portable device.