Press on power-up detection for a touch-sensor device
First Claim
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1. A method comprising:
- powering up an electronic system;
measuring a first capacitance value of a target sensing device within a certain time period during the powering up of the electronic system, wherein a baseline value for the target sensing device is not established prior to the measuring the first capacitance value;
measuring a second capacitance value of a secondary sensing device within the certain time period;
determining that a conductive object was present at the target sensing device within at least the certain time period prior to establishing the baseline value for the target sensing device, wherein the determining comprises calculating a difference between the first capacitance value of the target sensing device and the second capacitance value of the secondary sensing devices exceeds a button threshold.
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Abstract
A method and apparatus to determine during a power-up of an electronic system whether a conductive object is present at a sensing device at the power-up.
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Citations
18 Claims
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1. A method comprising:
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powering up an electronic system; measuring a first capacitance value of a target sensing device within a certain time period during the powering up of the electronic system, wherein a baseline value for the target sensing device is not established prior to the measuring the first capacitance value; measuring a second capacitance value of a secondary sensing device within the certain time period; determining that a conductive object was present at the target sensing device within at least the certain time period prior to establishing the baseline value for the target sensing device, wherein the determining comprises calculating a difference between the first capacitance value of the target sensing device and the second capacitance value of the secondary sensing devices exceeds a button threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electronic system comprising:
A processing device configured to receive signals from a target sensing device and one or more secondary sensing devices, the processing device to determine at power-up of the electronic system that a conductive object is present at the target sensing device within a certain time period during the power-up by determining that a difference between a first capacitance value of the target sensing device and a second capacitance value of one or more secondary sensing devices exceeds a button threshold prior to establishing a baseline value for the target sensing device. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An electronic system comprising:
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means for powering up the electronic system during a first time period; means for measuring a first capacitance value of a target sensing device within the first time period, wherein a baseline value for the target sensing device is not established prior to the measuring the first capacitance value; means for measuring a second capacitance value of a secondary sensing device within the first time period; means for determining that a conductive object was present at the target sensing device within at least the certain time period prior to establishing the baseline value for the target sensing device, wherein the means for determining comprises calculating that a difference between the first capacitance value of the target sensing device and the second capacitance value of the secondary sensing devices exceeds a button threshold. - View Dependent Claims (18)
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Specification