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Waterproof baseline tracking in capacitive touch controllers

  • US 8,823,678 B2
  • Filed: 03/02/2012
  • Issued: 09/02/2014
  • Est. Priority Date: 01/09/2012
  • Status: Active Grant
First Claim
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1. A method for a touch panel control circuit, the method comprising:

  • stimulating a touch panel;

    receiving signals from the touch panel responsive to the stimulating;

    based on the received signals, determining a contaminant to be present on the touch panel, includingcomparing a minimum capacitance value for the touch panel with a threshold value, andif the minimum capacitance value exceeds the threshold value,determining the contaminant is present; and

    switching to a wet baseline mode of operation while the contaminant is present on the touch panel.

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