Device for detecting a capacitance variation and capacitive sensor for detecting the presence of a user using such a device
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United States of America Patent
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Oct 29, 2013
Grant Date -
Sep 16, 2010
app pub date -
May 30, 2006
filing date -
Jun 1, 2005
priority date (Note) -
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Abstract
A device for detecting a variation in the capacitance of a variable capacitive structure, wherein the device generates voltage pulses, charges the variable capacitive structure using the voltage pulses, discharges the variable capacitive structure toward a reference capacitor, detects a voltage threshold across the terminals of the reference capacitor, determines a number of charges and/or discharges of the variable capacitive structure corresponding to the voltage threshold, and detects a variation in the number of charges and/or discharges with respect to a number of charges and/or discharges previously obtained.
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