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AssigneeSemtech Corporation
InventorsChaouki ROUAISSIA, Sébastien GRISOT, Jerald G. OTT, III
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The present invention relates to a capacitive sensor device comprising a capacitance-measuring circuit, a main sense input and a reference sense input, wherein the capacitive sensor device is configured to measure, using the capacitance-measuring circuit, a current main value of capacitance seen by the main sense input and a current reference value of capacitance seen by the reference sense input, wherein the capacitive sensor device is configured to at least temporarily store at least one previously measured reference value, and wherein the capacitive sensor device is configured to use 1) the current main value, 2) the current reference value and the at least one previously measured reference value, and 3) at least one current correction coefficient, with the capacitive sensor device being configured to adaptively determine the at least one current correction coefficient based on at least the current reference value and the at least one previously measured reference value, for determining a corrected current main value of capacitance. The present invention further relates to a portable electronic device comprising the capacitive sensor device.
A capacitive sensor device comprising a capacitance-measuring circuit, a main sense input connectable to a capacitive sense electrode and a reference input, the capacitive sensor device being configured to sample repeatedly a sense capacitance seen by the main sense input and a reference capacitance seen by the reference input, and to compensate a drift component in samples of the sense capacitance by subtracting corresponding samples of the reference capacitance multiplied by a variable correction coefficient.
Dependencies are inferred from the claim text.