Voltage Driven Self-Capacitance Measurement
AssigneeAtmel Corporation
InventorRichard Collins
Life of this patent
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Abstract
In one embodiment, a method includes substantially simultaneously applying a pre-determined voltage to a sense electrode and a corresponding drive electrode of a touch sensor. The application of the pre-determined voltage providing a measurement current at a capacitance including the sense electrode. The method also includes determining a difference between the measurement current at the capacitance and a reference value; and determining whether a proximity input to the touch sensor has occurred based at least in part on the difference.
Claims20
A method comprising:
- substantially simultaneously applying a pre-determined voltage to a sense electrode and a corresponding drive electrode of a touch sensor, the application of the pre-determined voltage providing a measurement current at a capacitance comprising the sense electrode;
- determining a difference between the measurement current at the capacitance and a reference value;
- and
- determining whether a proximity input to the touch sensor has occurred based at least in part on the difference.
A computer-readable non-transitory storage medium embodying logic configured when executed to:
- substantially simultaneously apply a pre-determined voltage to a sense electrode and a corresponding drive electrode of a touch sensor, the application of the pre-determined voltage providing a measurement current at a capacitance comprising the sense electrode;
- determine a difference between the measurement current at the capacitance and a reference value;
- and
- determine whether a touch input to the touch sensor has occurred based at least in part on the difference.
A device comprising:
- a measurement circuit;
- and
- a computer-readable non-transitory storage medium coupled to the measurement circuit and embodying logic configured when executed to:
- substantially simultaneously apply a pre-determined voltage to a sense electrode and a corresponding drive electrode of a touch sensor, the application of the pre-determined voltage providing a measurement current at a capacitance comprising the sense electrode;
- determine a difference between the measurement current at the capacitance and a reference value;
- and
- determine whether a touch input to the touch sensor has occurred based at least in part on the difference.
Dependencies are inferred from the claim text.