Calibration apparatus and method for capacitive sensing devices
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United States of America Patent
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Aug 14, 2012
Grant Date -
May 5, 2011
app pub date -
Dec 22, 2009
filing date -
Nov 4, 2009
priority date (Note) -
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Abstract
A calibration apparatus and method for a capacitive sensing device, in which a calibration capacitor device connects to the capacitive sensing device which is connected to an integration circuit that generates a voltage output and a latch output, a transforming circuit transforms a sensitivity calibration parameter into a pair of corresponding analog signal outputs, and an offset calibration parameter into a corresponding analog signal output, at least two first switches between the pair of corresponding analog signal outputs and a fixed potential according to system clock's levels, and at least a third switch switches between the corresponding analog signal output and another fixed potential according to the system clock's levels. The apparatus determines the switch between the pair of signal outputs according to the latch output.
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