GENERAL DESCRIPTION
The AD7142 and AD7142-1 are integrated capacitance-to-digital converters (CDCs) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7142 and AD7142-1 can interface to external capacitance sensors implementing functions such as capacitive buttons, scroll bars, or wheels.

FEATURES
   Programmable capacitance-to-digital converter
      36 ms update rate (at maximum sequence length)
      Better than 1 fF resolution
      14 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
   SPI-compatible serial interface (AD7142)
   I2C-compatible serial interface (AD7142-1)
   Separate VDRIVE level for serial interface
   Interrupt output and GPIO
   32-lead, 5 mm x 5 mm LFCSP
   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