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Group scanning circuit and method for a capacitive touch sensor

  • US 8,988,362 B2
  • Filed: 02/05/2010
  • Issued: 03/24/2015
  • Est. Priority Date: 02/11/2009
  • Status: Active Grant
First Claim
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1. A circuit for a capacitive touch sensor, wherein the capacitive touch sensor includes a plurality of traces, the circuit comprising:

  • n number channels;

    a multiplexer connected to the n number of channels, for selecting n number of adjacent traces from the plurality of traces to connect to the n number of channels; and

    a front-end circuit connected to the n number of channels, for simultaneously detecting the n number of adjacent traces to extract analog-to-digital conversion values therefrom,wherein the front-end circuit selects a target trace having a maximum analog-to-digital conversion value corresponding to a touch point from the plurality of traces after all of the plurality of traces are scanned, and then p number of adjacent traces including the target trace, anda noise equalizer connected to the front-end circuit, for performing noise equalization over the analog-to-digital conversion values of the p number of adjacent traces after the p number of adjacent traces are scanned;

    wherein n and p are integers, and n≧

    2, p≧

    2; and

    wherein p is less than a number of the plurality of traces.

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