AD7142 is a programmable 14-channel capacitive touch sensor controller that supports SPI® and I2C® interfaces, with a 36 ms update rate and 1 fF resolution.
The AD7142 and AD7142‑1 are programmable capacitance‑to‑digital converters designed for touch‑sensor applications such as buttons, scroll bars, and wheels. The device offers 14 sensor input channels, on‑chip calibration, and both SPI‑compatible and I²C‑compatible serial interfaces.
The handbook provides full specifications, timing diagrams, pin descriptions, and typical application circuits, along with revision history and absolute maximum ratings for reliable integration into consumer electronics and handheld devices.
| Supply Voltage (AVcc, DVcc) | 2.6 V to 3.6 V |
|---|---|
| Update Rate | ≈36 ms |
| Resolution | 16 Bit |
| Capacitance Sensor Input Channels | 14 |
| CIN Input Leakage | 25 nA |
| Total Unadjusted Error | +20 % |
| Output Noise (Peak‑to‑Peak, Decimation 128) | 7 Codes |
| Maximum Output Load | 250 pF |
| Low Power Mode Current | 50 µA (typical) |
The AD7142 operates from a supply voltage of 2.6 V to 3.6 V.
The device provides 14 capacitance sensor input channels.
The AD7142 updates approximately every 36 ms at the maximum sequence length.
It includes an SPI‑compatible serial interface and an I²C‑compatible (PC) interface.