Introduction

Microchip’s Analog-to-Digital Converter with Computation (ADC²) allows users to quickly and easily capture relative capacitance measurements on an analog pin by implementing the Capacitive Voltage Divider (CVD) feature. The internal sample and hold capacitor is utilized as a reference to an external conductive sensor during an ADC² acquisition. This feature of the ADC² can be used to simplify applications that implement capacitive touch or proximity sensing by reducing the amount of software needed, as well as lowering CPU overhead required for this functionality. The purpose of this technical brief is to give an overview of how to implement the CVD hardware included on the ADC² module and describe the basic operation and configuration of the CVD feature.