GENERAL DESCRIPTION
The AD7148 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
      8 capacitance sensor inputs
      25 ms update rate, all 8 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 compatible with AD7143
   On-chip RAM to store calibration data
   I2C-compatible serial interface
   Separate VDRIVE level for serial interface
   Interrupt output
   16-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