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Time multiplexed touch detection and power charging

  • US 9,811,204 B2
  • Filed: 06/23/2014
  • Issued: 11/07/2017
  • Est. Priority Date: 06/23/2014
  • Status: Active Grant
First Claim
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1. A method of scanning a touch sensor panel, comprising:

  • acquiring touch data from a plurality of touch sensors during at least one of charge and charge-free periods, the charge and charge-free periods occurring while the touch sensor panel is coupled to a charger;

    determining whether the touch data was acquired during at least one of the charge periods, wherein the at least one of the charge periods includes noise received from the charger;

    discarding the touch data when the touch data was acquired during the at least one of the charge periods;

    in accordance with the touch data including an indication of a touch on the touch sensor panel;

    generating and transmitting a first notification to the charger to operate with charge periods having a first duty cycle; and

    in accordance with the touch data including an indication of an absence of a touch on the touch sensor panel;

    generating and transmitting a second notification to the charger to operate with charge periods having a second duty cycle, the second duty cycle greater than the first duty cycle.

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