Capacitance measuring circuit and method
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United States of America Patent
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Jun 26, 2012
Grant Date -
Jun 19, 2008
app pub date -
Dec 19, 2006
filing date -
Dec 19, 2006
priority date (Note) -
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Abstract
Disclosed are systems and methods of measuring a plate capacitance, which include accumulating a first signal representative of charge over a plurality of switch-controlled plate charging cycles and accumulating a second signal representative of charge over another plurality of switch-controlled plate discharging cycles. The accumulated first and second signals can then be used to determine the capacitance on the plate. Such systems and methods can be useful in capacitive touch sensing devices such as capacitive buttons and capacitive touch panels.
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