This document is the AD7147/AD7147-1 data sheet, which introduces the functions and features of AD7147/AD7147-1, including 13 capacitance sensor inputs, 9 ms update rate, automatic conversion sequence, automatic calibration logic, automatic compensation for environmental changes, automatic adaptive threshold and sensitivity levels, SPI compatible serial interface, I2C compatible serial interface, independent VDRIVE level, interrupt output and general-purpose input/output (GPIO)
The AD7147 is a CapTouch programmable controller designed for single‑electrode capacitance sensors such as buttons, scroll bars, and wheels. It integrates a 16‑bit CDC with on‑chip environmental calibration, supports up to 13 sensor inputs, and operates from a 2.6 V to 3.6 V supply.
The document provides a functional block diagram, detailed specifications, average current data, SPI and PC‑compatible serial interface timing, absolute maximum ratings, and pin configuration tables, enabling designers to implement the device in ultrathin applications.
| Supply Voltage (Vcc) | 2.6 V to 3.6 V |
|---|---|
| Resolution | 16 Bits |
| Capacitance Sensor Inputs | 13 |
| CINx Input Range | +8 pF |
| CINx Input Leakage | 25 nA |
| Operating Temperature Range | -40°C to +85°C |
| Low Power Mode Current (typical) | 26 µA (13 sensors) |
| Maximum Output Load (CINx) | 20 pF |
| SPI Max Clock Frequency | 5 MHz |
| PC‑compatible Max Clock Frequency | 400 kHz |
The AD7147 operates from 2.6 V to 3.6 V supply voltage.
The device provides 13 capacitance sensor inputs.
In low‑power mode the AD7147 draws about 26 µA for 13 sensors.