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Multiple channel capacitive voltage divider scanning method and apparatus

  • US 9,857,394 B2
  • Filed: 10/01/2014
  • Issued: 01/02/2018
  • Est. Priority Date: 10/04/2013
  • Status: Active Grant
First Claim
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1. A method for determining change in capacitance of at least one capacitive sensor of a plurality of capacitive sensors, said method comprising steps of:

  • coupling by first switches the plurality of capacitive sensors with a first voltage;

    coupling by second switches a sample and hold capacitor with a second voltage;

    coupling by the first and second switches the plurality of capacitive sensors with the sample and hold capacitor, wherein electron charge from the plurality of capacitive sensors is transferred to the sample and hold capacitor;

    measuring by a processor a resulting voltage on the sample and hold capacitor; and

    comparing by the processor the resulting voltage to a previously measured resulting voltage, wherein if the resulting voltage is different than the previously measured resulting voltage then the at least one capacitive sensor of the plurality of capacitive sensors has changed capacitance value.

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