INDUCTIVE TOUCH SENSING CIRCUIT PROVIDING SENSITIVITY COMPENSATION
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United States of America Patent
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Issued Date -
Sep 27, 2012
app pub date -
Mar 24, 2011
filing date -
Mar 24, 2011
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An inductive touch sensing circuit having sensitivity compensation is provided. A digital processor controls a variable amplifier signal source that is synchronized to the key selection. This configuration provides closed loop control of the strength of each key's excitation signal for each of a plurality of inductive touch sensors or key switch assembly, so that the system can adaptively provide different strength excitation signals to each of the different key switch assemblies. In this way, the inductive touch sensing circuit can compensate for the effects of age, temperature, environment and varying key geometries and tolerances, using the excitation signal delivered by the drive circuit.
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