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CAPACITIVE TOUCH SENSING SYSTEM WITH INTERFERENCE REJECTION

  • US 20140176482A1
  • Filed: 01/30/2013
  • Published: 06/26/2014
  • Est. Priority Date: 12/20/2012
  • Status: Active Grant
First Claim
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1. A method of sensing capacitance of a capacitive touch sensor and rejecting interference coupled-in through the touch sensor during a conversion cycle, the method comprising:

  • generating a driving signal, the driving signal driving the capacitive touch sensor during the conversion cycle;

    alternately storing charge transferred from the capacitive touch sensor to a switched-capacitor integrator during the conversion cycle; and

    recording total charge accumulated in the switched-capacitor integrator during the conversion cycle.

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