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Capacitive switch reference method

  • US 8,456,180 B2
  • Filed: 08/10/2010
  • Issued: 06/04/2013
  • Est. Priority Date: 08/10/2010
  • Status: Active Grant
First Claim
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1. An apparatus, the apparatus being a capacitive switch operated by sensing the presence of a finger:

  • said apparatus comprising;

    a capacitive switch sensor, providing a capacitive switch signal indicating the presence of the finger;

    a capacitive reference sensor, sensing a capacitive reference signal; and

    an electronic circuit, receiving the capacitive switch signal and the capacitive reference signal,the electronic circuit detecting switch activation by comparing the capacitive switch signal to a threshold signal level,the threshold signal level being adjusted as a function of the capacitive reference signal,the capacitive reference sensor sensing the capacitive reference signal only when the finger is in proximity to the capacitive reference sensor.

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