GENERAL DESCRIPTION
The AD7147 is designed for use with capacitance sensors implementing functions such as buttons, scroll bars, and wheels. The sensors need only one PCB layer, enabling ultra thin 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
  
APPLICATIONS
   Cell phones
   Personal music and multimedia players
   Smart handheld devices
   Television, A/V, and remote controls
   Gaming consoles
   Digital still cameras