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Smart scanning for a capacitive sensing array

  • US 9,013,441 B2
  • Filed: 02/25/2011
  • Issued: 04/21/2015
  • Est. Priority Date: 08/24/2010
  • Status: Active Grant
First Claim
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1. A method comprising:

  • simultaneously driving a plurality of transmit electrodes in each of a plurality of scan groups in a capacitive sense array to generate a group receive signal for each of the plurality of scan groups corresponding to a mutual capacitance at sense elements of the capacitive sense array that form the scan group, wherein each of the plurality of scan groups comprises a plurality of sense elements;

    determining, based on the group receive signals from the plurality of scan groups, a scan group where the generated receive signal is affected by a presence of a conductive object in proximity to the capacitive sense array, wherein each of a number of receive electrodes that form one of the plurality of scan groups share a single receive processing channel of a plurality of receive processing channels;

    sequentially driving one or more of the plurality of transmit electrodes in an identified scan group with a transmit signal, where the generated receive signal corresponding to the identified scan group is affected by the presence of the conductive object in proximity to the capacitive sense array; and

    determining, based on individual receive signals on each of the receive electrodes that form the identified scan group resulting from the sequential driving, a location of the conductive object, wherein each of the receive electrodes that form the identified scan group are coupled to a separate receive processing channel of the plurality of receive processing channels.

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