Reducing sleep current in a capacitance sensing system
First Claim
1. A method, comprising:
- individually measuring a capacitance on each of a plurality of sensor elements of a device;
coupling a group of sensor elements of the plurality of sensor elements together when a presence of a conductive object is not detected on the plurality of sensor elements while individually measuring the capacitance on each of the plurality of sensor elements; and
collectively measuring a capacitance on the group of sensor elements.
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Accused Products
Abstract
An apparatus and method for reducing power consumption of capacitance sensing device in a reduce power mode. In one embodiment, the method includes individually measuring a capacitance on each of a plurality of sensor elements of a device, coupling a group of sensor elements of the plurality of sensor elements together when a presence of a conductive object is not detected on the plurality of sensor elements while individually measuring the capacitance on each of the plurality of sensor elements, and collectively measuring a capacitance on the group of sensor elements. In one embodiment, the apparatus includes a processing device, and a plurality of sensor elements that are individually coupled in a first mode and collectively coupled in a second mode.
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Citations
32 Claims
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1. A method, comprising:
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individually measuring a capacitance on each of a plurality of sensor elements of a device; coupling a group of sensor elements of the plurality of sensor elements together when a presence of a conductive object is not detected on the plurality of sensor elements while individually measuring the capacitance on each of the plurality of sensor elements; and collectively measuring a capacitance on the group of sensor elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus, comprising:
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a processing device; and a plurality of sensor elements, wherein the plurality of sensor elements are individually coupled to the processing device in a first mode, and wherein a group of sensor elements of the plurality of sensor elements are collectively coupled to the processing device in a second mode when a presence of a conductive object is not detected on the plurality of sensor elements in the first mode. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus, comprising
means for individually measuring a capacitance on a plurality of sensor elements in a first mode; -
means for collectively measuring a capacitance on a group of sensor elements of the plurality of sensor elements in a second mode; and means for transitioning to the second mode from the first mode when a presence of a conductive object has not been detected in the first mode. - View Dependent Claims (30, 31, 32)
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Specification