AD7147A is a programmable single-electrode capacitance sensor controller that supports 13 channels of capacitance sensor input, and can achieve a 9ms update rate. It has automatic calibration logic and automatic compensation for environmental changes.
The AD7147A CapTouch™ controller is a programmable capacitance‑to‑digital converter designed for single‑electrode sensors such as buttons, scroll bars and wheels. It offers femtofarad resolution, 13 sensor inputs and supports both SPI and I²C‑compatible serial interfaces.
The document provides a functional block diagram, electrical specifications, timing diagrams, absolute maximum ratings, pin descriptions, PCB design guidelines and register maps to help engineers integrate the device into handheld, multimedia and other thin‑profile applications.
| Supply Voltage (VCC) | 2.6 V to 3.6 V |
|---|---|
| Resolution | 16 Bits |
| Capacitance Sensor Inputs | 13 |
| Low Power Mode Current | 28.96 µA |
The device operates from 2.6 V up to 3.6 V.
It supports 13 capacitance sensor inputs.
In low‑power mode the controller draws about 28.96 µA.
The part provides an SPI‑compatible serial interface and an I²C‑compatible serial interface (AD7147A‑1).