GENERAL DESCRIPTION
The AD7147 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 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 AD7142
   On-chip RAM to store calibration data
   SPI-compatible (serial-peripheral-interface-compatible)
      serial interface (AD7147)
   I2C-compatible serial interface (AD7147-1)
   Separate VDRIVE level for serial interface
   Interrupt output and general-purpose input/output (GPIO)
   24-lead, 4 mm × 4 mm LFCSP
   2.6 V to 3.3 V supply voltage
   Low operating current
      Full power mode: 1 mA
      Low power mode: 21.5 μA
   Qualified for automotive applications
  
APPLICATIONS
   Cell phones
   Personal music and multimedia players
   Smart handheld devices
   Television, A/V, and remote controls
   Gaming consoles
   Digital still cameras