GENERAL DESCRIPTION
The AD7143 is an integrated capacitance-to-digital converter (CDC) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7143 interfaces to external capacitance sensors implementing functions, such as capacitive buttons, scroll bars, and scroll wheels.

FEATURES
   Programmable capacitance-to-digital converter
      25 ms update rate (@ maximum sequence length)
      Better than 1 fF resolution
      8 capacitance sensor input channels
      No external RC tuning components required
      Automatic conversion sequencer
   On-chip automatic calibration logic
      Automatic compensation for environmental changes
      Automatic adaptive threshold and sensitivity levels
   On-chip RAM to store calibration data
   I2C®-compatible serial interface
   Separate VDRIVE level for serial interface
   Interrupt output for host controller
   16-lead, 4 mm x 4 mm LFCSP-VQ
   2.6 V to 3.6 V supply voltage
   Low operating current
      Full power mode: less than 1 mA
      Low power mode: 50 μA

APPLICATIONS
   Personal music and multimedia players
   Cell phones
   Digital still cameras
   Smart hand-held devices
   Television, A/V, and remote controls
   Gaming consoles