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Multiplexer for a TX/RX capacitance sensing panel

  • US 9,377,905 B1
  • Filed: 01/27/2012
  • Issued: 06/28/2016
  • Est. Priority Date: 05/31/2011
  • Status: Active Grant
First Claim
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1. A multiplexer circuit, comprising:

  • a plurality of PTOTAL receive (RX) channel outputs coupled with a plurality of mutual capacitance sensing channels, wherein PTOTAL is a total number of the RX channel outputs;

    a plurality of switches coupled to the plurality of RX channel outputs; and

    a plurality of QTOTAL pins, wherein QTOTAL is a total number of the pins, each of the plurality of pins is coupled to a respective one of a plurality of sensor electrodes at a first end and a respective one of the plurality of switches at a second end, and QTOTAL is greater than PTOTAL, wherein each of a first subset and a third subset of the plurality of QTOTAL pins is switchably coupled to at least a respective one of the plurality of RX channel outputs, and wherein for each possible subset of PTOTAL contiguous pins from the plurality of QTOTAL pins, each pin in the respective possible subset is switchably coupled to a respective different RX channel output of the plurality of RX channel outputs.

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