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Multi-mode capacitive sensing device and method with current conveyor

  • US 9,442,146 B2
  • Filed: 10/14/2014
  • Issued: 09/13/2016
  • Est. Priority Date: 03/26/2009
  • Status: Active Grant
First Claim
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1. A capacitance sensing device, comprising:

  • a first plurality of sensor elements;

    a second plurality of sensor elements;

    a capacitance sensing circuit coupled to the first and second pluralities of sensor elements, the capacitance sensing circuit configured to generate a first current representative of a self capacitance of at least one of the first plurality of sensor elements and configured to generate a second current representative of a mutual capacitance of at least one of the second plurality of sensor elements; and

    a conversion circuit configured to convert the first current to a first digital value and the second current to a second digital value,wherein the capacitance sensing circuit is configured to generate the first current and the second current in response to a signal from a mode selection circuit.

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