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Input device transmitter path error diagnosis

  • US 8,692,794 B2
  • Filed: 01/25/2011
  • Issued: 04/08/2014
  • Est. Priority Date: 01/25/2011
  • Status: Active Grant
First Claim
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1. A processing system configured for capacitive sensing, said processing system comprising:

  • transmitter circuitry configured to transmit during a first time period with a first transmitter path of a plurality of transmitter paths in an input device, wherein each transmitter path of said plurality of transmitter paths is configured for capacitive sensing;

    a first internal diagnostic mechanism comprising;

    a selectable leakage path,a buffered output coupled with said selectable leakage path and said first transmitter path, anda selectable diagnostic node coupled as an input select of said selectable leakage path, wherein said selectable leakage path is configured to be coupled with said transmitter circuitry to intentionally discharge a charged portion of said transmitter circuitry with which said selectable leakage path is coupled; and

    a determination module configured to determine when a discontinuity exists within said first transmitter path based on a discharge rate for said first transmitter path, wherein said discharge rate is acquired during a second time period via said selectable leakage path of said first internal diagnostic mechanism, wherein said second time period occurs after said first time period.

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