CHARGE SHARE FOR CAPACITIVE SENSING DEVICES
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United States of America Patent
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Issued Date -
Nov 2, 2017
app pub date -
Jun 30, 2016
filing date -
May 2, 2016
priority date (Note) -
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Abstract
An input device and associated processing system and method are disclosed for operating a plurality of sensor electrodes. The method comprises driving, during a first period, a first portion of a plurality of sensor electrodes to a first voltage. The first portion corresponds to a first number of sensor electrodes. The method further comprises driving, during the first period, a second portion of the plurality of sensor electrodes to a second voltage less than the first voltage. The second portion corresponds to a second number of sensor electrodes. The first number and second number are based on a plurality of digital codes used to drive the first and second portions. The method further comprises transferring charge between the first portion and second portion to drive the second portion to an intermediate voltage, and driving, during a second period, the second portion from the intermediate voltage to the first voltage.
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