Patent ID: 8648834

Claim:
A capacitive touchscreen or touch panel system, comprising: a touchscreen comprising a first plurality of electrically conductive drive electrodes arranged in rows or columns, and a second plurality of electrically conductive sense electrodes arranged in rows or columns arranged at an angle with respect to the rows or columns of the first plurality of electrodes, mutual capacitances existing between the first and second pluralities of electrodes at locations where the first and second pluralities of electrodes intersect, the mutual capacitances changing in the presence of one or more fingers of a user or touch devices brought into proximity thereto; drive circuitry operably connected to the first plurality of drive electrodes; sense circuitry operably connected to the second plurality of sense electrodes and configured to sense input signals therefrom, and a controller operably connected to the first plurality of drive electrodes and the second plurality of sense electrodes, the controller comprising an analog-to-digital converter (ADC) configured to operate in a first mode characterized by a first resolution having a first number of ADC bits and a first level of power consumption associated therewith, and to operate in a second mode characterized by a second resolution having a second number of bits and a second level of power consumption associated therewith, the ADC operating under control of the controller and being configured such that the first number of bits is greater than the second number of bits and the first power level is greater than the second power level, the controller being configured to cause the ADC to switch from operating in the first mode to operating in the second mode according to a value of coarse gain used by a coarse gain and filter control element when low radio frequency (RF) noise conditions are detected by one of the sense circuitry, the ADC and the controller.