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Sensor electrode path error diagnosis

  • US 9,552,121 B2
  • Filed: 06/30/2015
  • Issued: 01/24/2017
  • Est. Priority Date: 01/25/2011
  • Status: Expired due to Fees
First Claim
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1. A processing system for a capacitive sensing input device, said processing system comprising:

  • a sensing module configured to couple with a first sensor electrode path of a plurality of sensor electrode paths, wherein the sensing module is configured to drive said first sensor electrode path with a first signal;

    a first internal diagnostic mechanism configured to couple with a second sensor electrode path and configured to acquire a test signal output while said sensing module drives said first sensor electrode path with said first signal, wherein said first internal diagnostic mechanism comprises a selectable current source configured to couple with said second sensor electrode path, and wherein said selectable current source is enabled during acquisition of said test signal output; and

    a determination module configured to determine whether said first and second sensor electrode paths are ohmically coupled together based on said test signal output.

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