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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