Method and apparatus for detecting a change in capacitance of a capacitive proximity sensor
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United States of America Patent
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Aug 17, 2004
Grant Date -
Apr 17, 2003
app pub date -
May 10, 2002
filing date -
Oct 17, 2001
priority date (Note) -
Expired
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Abstract
A method for detecting a change in capacitance of a capacitive sensing element having a nominal capacitance value is disclosed. In an exemplary embodiment, the method includes coupling the sensing element to a first oscillator, the first oscillator generating a first frequency dependent upon the capacitance value of the sensing element. The first frequency is compared to a reference frequency generated by a second oscillator. The change in capacitance from the nominal capacitance value is detected if the first frequency differs from said reference frequency by a determined frequency value.
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