FREQUENCY HOPPING FOR A CAPACITIVE TOUCH SCREEN CONTROLLER
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Accused Products
Abstract
A circuit includes a force driver configured to apply a force signal to a force node associated with a mutual capacitance to be sensed. A sensing circuit receives a sense signal from a sense node associated with said mutual capacitance to be sensed. The sensing circuit operates to generate an output signal indicative of the sensed mutual capacitance. A control circuit controls generation of the force signal to alternate between at least two different frequencies and generate said output signal for each half cycle of the force signal.
24 Citations
36 Claims
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1-19. -19. (canceled)
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20. A circuit, comprising:
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a force driver configured to apply a force signal to a force node associated with a mutual capacitance to be sensed; a sensing circuit having an input coupled to receive a sense signal from a sense node associated with said mutual capacitance to be sensed, said sensing circuit configured to generate an output signal indicative of the sensed mutual capacitance; and a control circuit configured to control generation of the force signal to alternate between at least two different frequencies and generate said output signal for each half cycle of the force signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification