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Capacitance measurement of a capacitive sensor using a microcontroller with an analog output to drive a guard ring
Capacitance measurement of a capacitive sensor using a microcontroller with an analog output to drive a guard ring
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机译：使用带模拟输出的微控制器驱动保护环的电容式传感器的电容测量
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摘要
A microcontroller measures capacitance of capacitive sensors having guard rings associated therewith. A guard ring is provided around each capacitive sensor plate and is charged to substantially the same voltage as a voltage on the associated capacitive sensor plate. The guard ring reduces parasitic capacitances of the capacitive sensor plate caused by differences in voltage potentials between the capacitive sensor plate, and adjacent circuit conductors, ground planes and power planes. An analog output is buffered and coupled to an analog input coupled to the capacitive sensor plate, and is used to drive the guard ring voltage to substantially the same voltage as the voltage on the capacitive sensor plate.
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