| CPC G06F 3/0412 (2013.01) [G06F 3/0416 (2013.01); G06F 3/044 (2013.01); G06F 3/04886 (2013.01)] | 16 Claims |
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1. A touch screen sensor controller comprises:
a plurality of row drive sense circuits for coupling to a plurality of row electrodes of a touch screen, wherein the row electrode of the plurality of row electrodes has a self-capacitance with respect to a ground reference of the touch sense circuit;
a plurality of column drive sense circuits for coupling to a plurality of column electrodes of the touch screen, wherein the column electrode of the plurality of column electrodes has a self-capacitance to the ground reference, and wherein a mutual capacitance is between the row electrode and the column electrode;
a processing module operably coupled to the plurality of row drive sense circuits and to the plurality of column drive sense circuits, wherein the processing module is operable to, when the plurality of row drive sense circuits is coupled to the plurality of row electrodes and the plurality of column drive sense circuits is coupled to the plurality of column electrodes:
substantially concurrently enable a common self-capacitance reference signal to be provided to a set of row drive sense circuits of the plurality of row drive sense circuits and a set of column drive sense circuits of the plurality of drive sense circuits, wherein the set of row drive sense circuits detects self-capacitances of a set of row electrodes coupled to the set of row drive sense circuits, wherein the set of column drive sense circuits detects self-capacitances of a set of column electrodes coupled to the set of column drive sense circuits;
substantially concurrently enable a set of mutual capacitance reference signals to be provided to one of the set of row drive sense circuits and to the set of column sense circuits, wherein the other one of the set of row drive sense circuits and the set of column sense circuits senses mutual capacitances of the set of row electrodes and the set of column electrodes, and wherein an oscillating component of the common self-capacitance reference signal is at a different frequency than the oscillating components of the set of mutual capacitance reference signals; and
generate a capacitive image based on the self-capacitances of the set of row electrodes, the self-capacitances of the set of column electrodes, and the mutual capacitances of the set of row electrodes and the set of column electrodes.
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