Patent ID: 9098155
Filing Date: 2015-08-04
Classification: G06F

Abstract:
1. A method comprising: configuring a compensation capacitor relative to a measurement capacitance based at least in part on a value of a calibration voltage relative to a reference value, wherein configuring the compensation capacitor comprises coupling the compensation capacitor in parallel with the measurement capacitance in response to the calibration voltage being lower than the reference value; dividing an amount of charge between the measurement capacitance, a sampling capacitor, and the compensation capacitor resulting in a voltage at the measurement capacitance being a measurement voltage, the division of the amount of charge being based at least in part on the configuration of the compensation capacitor relative to the measurement capacitance; determining a measurement difference between the measurement voltage at the measurement capacitance and a reference value; and determining whether a touch input to a touch sensor has occurred based at least in part on the measurement difference.