App Note: mTouch CVD capacitive sensing method
Here’s an app note from Microchip describing the implementation of the mTouch capacitive voltage divider (CVD) capacitive sensing. CVD is a capacitive sensing technique designed to only require a single ADC pin to function. CVD measures capacitance connected to this pin by comparing it to the internal capacitance of the ADC sample and hold circuit.
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This application note will describe how the mTouch CVD capacitive sensing method is implemented, analyze how its signal behaves in relation to changes in the environment, and define several optional performance enhancements to increase sensitivity and decrease noise on the output.