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GENERAL DESCRIPTION

The AD7147A 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 (fF) 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 AD714x

On-chip RAM to store calibration data

Serial peripheral interface (SPI) (AD7147A)

I2C-compatible serial interface (AD7147A-1)

Separate VDRIVE level for serial interface

Interrupt output and general-purpose input/output (GPIO)

25-ball, 2.3 mm × 2.1 mm WLCSP

2.6 V to 3.6 V supply voltage

Low operating current

Full power mode: 1 mA

Low power mode: 28.96 μA

APPLICATIONS

Cell phones

Personal music and multimedia players

Smart handheld devices

Television, A/V, and remote controls

Gaming consoles

Digital still cameras