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Low power capacitive touch detector

  • US 8,797,049 B2
  • Filed: 03/22/2012
  • Issued: 08/05/2014
  • Est. Priority Date: 09/15/2011
  • Status: Active Grant
First Claim
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1. A capacitive touch detection system of a microcontroller, the capacitive touch detection system comprising:

  • a counter module configured to detect an input signal, count a number of first occurrences that the input signal has a first value during a first time period and a number of second occurrences that the input signal has a second, different value during a second time period successive to the first time period, and generate a raw count signal having a raw count value based on the number of first occurrences and the number of second occurrences;

    a filtering system coupled to the counter module, the filtering system configured to remove noise from the raw count signal and to generate a processed count signal having a processed count value; and

    a first state detector coupled to the filtering system, the first state detector configured to perform a first comparison of the processed count value against a first threshold value and generate a first output signal based on the first comparison.

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