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Periodic sensor autocalibration and emulation by varying stimulus level

  • US 7,920,134 B2
  • Filed: 06/13/2007
  • Issued: 04/05/2011
  • Est. Priority Date: 06/13/2007
  • Status: Active Grant
First Claim
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1. A method for determining a stimulus voltage for a capacitive touch sensor that simulates a touch on the sensor for use in calibrating the sensor, comprising:

  • during pre-delivery calibration,applying a predetermined touch to the sensor;

    determining a touch calibration output value from an analog channel coupled to the sensor; and

    with no touch applied, determining a stimulus voltage at which the output value from the analog channel is approximately equivalent to the touch calibration output value.

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