Promising to extend the battery lifetime and reduce circuit complexity and component count in advanced portable devices, the CM3612 from Capella Microsystems combines proximity and ambient light sensor functions in a single chip. The proximity detector in the chip is topped with a microscopic 830- to 880-nm IR filter and the ambient light sensor diode has a filter that passes only the green light band (450 to 650 nm) to better match the brightness sensing mechanism of the human eye. The 2.35 x 1.8 x 1-mm OPLGA package also contains a digital low-pass filter to remove florescent light flicker, a 12-bit A/D converter, a DSP, a temperature compensation circuit, an I²C interface, an oscillator, and a driver for an IR emitter. The sensor accepts from 2.6 to 3.7 volts with a typical current consumption of130 µA. The CM3612 version provides the ambient light value via a 12-bit I2C interface and the CM3601 version uses a DAC to output the ambient light value as an analog output signal. From $1.20 each in 10,000-unit quantities.