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Method and apparatus to improve noise immunity of a touch sense array

  • US 9,645,690 B1
  • Filed: 07/28/2015
  • Issued: 05/09/2017
  • Est. Priority Date: 04/19/2011
  • Status: Active Grant
First Claim
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1. A method, performed at a capacitive sensing circuit for a touch sense array, comprising:

  • scanning the touch sense array using a first sensing frequency passband;

    during a noise detection state in which transmit TX signals are absent on TX electrodes;

    receiving a response signal on an RX channel;

    measuring a noise component of the response signal; and

    when a level of noise of the noise component within the first sensing frequency passband is greater than a threshold, selecting a second sensing frequency passband having a lower level of noise from among a plurality of alternative sensing frequency passbands; and

    scanning the touch sense array using the second sensing frequency passband.

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