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