This document describes the features and characteristics of the AD7142 Rev. A programmable controller for capacitance touch sensors. These include a 36ms update rate, better than 1 fF resolution, 14 capacitance sensor input channels, automatic conversion sequencer, on-chip automatic calibration logic, automatic compensation for environmental changes, and automatic adaptive threshold and sensitivity levels.
The AD7142 and AD7142‑1 are integrated capacitance‑to‑digital converters (CDCs) that provide up to 14 sensor input channels and on‑chip environmental calibration. They feature a 16‑bit sigma‑delta converter, automatic conversion sequencing, and both SPI‑compatible and I²C‑compatible serial interfaces.
The device operates from 2.6 V to 3.6 V, consumes less than 1 mA in full‑power mode and as low as 50 µA in low‑power mode, and includes an interrupt output and GPIO for flexible system integration.
| Supply Voltage (AVcc, DVcc) | 2.6 V to 3.6 V |
|---|---|
| Update Rate | ≈36 ms |
| Resolution | 16 Bit |
| Number of Sensor Input Channels | 14 |
| Full Power Mode Current | < 1 mA |
The AD7142 operates from 2.6 V to 3.6 V.
It provides 14 capacitance sensor input channels.
The AD7142 has an SPI‑compatible serial interface, while the AD7142‑1 uses an I²C‑compatible interface.
The device updates approximately every 36 ms.