GENERAL DESCRIPTION The AD7147A CapTouch™ controller is designed for use with capacitance sensors implementing functions such as buttons, scroll bars, and wheels. The sensors need only one PCB layer, enabling ultrathin applications.
FEATURES Programmable capacitance-to-digital converter (CDC) Femtofarad (fF) resolution 13 capacitance sensor inputs 9 ms update rate, all 13 sensor inputs No external RC components required Automatic conversion sequencer On-chip automatic calibration logic Automatic compensation for environmental changes Automatic adaptive threshold and sensitivity levels Register map is compatible with the AD714x On-chip RAM to store calibration data Serial peripheral interface (SPI) (AD7147A) I2C-compatible serial interface (AD7147A-1) Separate VDRIVE level for serial interface Interrupt output and general-purpose input/output (GPIO) 25-ball, 2.3 mm × 2.1 mm WLCSP 2.6 V to 3.6 V supply voltage Low operating current Full power mode: 1 mA Low power mode: 28.96 μA APPLICATIONS Cell phones Personal music and multimedia players Smart handheld devices Television, A/V, and remote controls Gaming consoles Digital still cameras
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