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AD7143 Datasheet integrated capacitance-to-digital converter

Manufacturer: Analog Devices

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General Description

The AD7143 is an integrated capacitance-to-digital converter (CDC) with on-chip environmental calibration for use in systems requiring a novel user input method.

The AD7143 interfaces to external capacitance sensors implementing functions, such as capacitive buttons, scroll bars, and scroll wheels.

The CDC has eight inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (∑-Δ) capacitance-to-digital converter.

Overview

www.DataSheet4U.com Programmable Controller for Capacitance Touch Sensors.

Key Features

  • Programmable capacitance-to-digital converter 25 ms update rate (@ maximum sequence length) Better than 1 fF resolution 8 capacitance sensor input channels No external RC tuning components required Automatic conversion sequencer On-chip automatic calibration logic Automatic compensation for environmental changes Automatic adaptive threshold and sensitivity levels On-chip RAM to store calibration data I2C®-compatible serial interface Separate VDRIVE level for serial interface Interrupt output for.

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