Low power capacitive sensor button
First Claim
1. An apparatus, comprising:
- a timer circuit configured to generate a repetitive trigger signal;
a low power oscillator block configured to generate a clock signal having a higher frequency than the repetitive trigger signal;
a sensing block coupled with the timer circuit and the oscillator block and configured to, in response to the repetitive trigger signal, detect a presence of a conductive object at a capacitive sensor button by applying an excitation signal based on the clock signal to the capacitive sensor button during a measurement period; and
a wake logic block coupled with the sensing block and configured to transition a processing unit from a low power consumption state to a high power consumption state in response to the sensing block detecting the presence of the conductive object at the capacitive sensor button.
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Abstract
A capacitance sensing module includes a timer circuit configured to generate a repetitive trigger signal, a low power oscillator block configured to generate a clock signal having a higher frequency than the repetitive trigger signal, a sensing block coupled with the timer circuit and the oscillator block and configured to, in response to the repetitive trigger signal, detect a presence of a conductive object at a capacitive sensor button by applying an excitation signal based on the clock signal to the capacitive sensor button, and a wake logic block coupled with the sensing block and configured to transition a processing unit from a low power consumption state to a high power consumption state in response to the sensing block detecting the presence of the conductive object at the capacitive sensor button.
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Citations
20 Claims
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1. An apparatus, comprising:
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a timer circuit configured to generate a repetitive trigger signal; a low power oscillator block configured to generate a clock signal having a higher frequency than the repetitive trigger signal; a sensing block coupled with the timer circuit and the oscillator block and configured to, in response to the repetitive trigger signal, detect a presence of a conductive object at a capacitive sensor button by applying an excitation signal based on the clock signal to the capacitive sensor button during a measurement period; and a wake logic block coupled with the sensing block and configured to transition a processing unit from a low power consumption state to a high power consumption state in response to the sensing block detecting the presence of the conductive object at the capacitive sensor button. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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generating a repetitive trigger signal; generating an excitation signal having a higher frequency than the repetitive trigger signal; in response to the repetitive trigger signal, detecting a presence of a conductive object at a capacitive sensor button by applying the excitation signal to the capacitive sensor button during a measurement period; and in response to detecting the presence of the conductive object at the capacitive sensor button, transitioning a processing unit from a low power consumption state to a high power consumption state. - View Dependent Claims (12, 13, 14, 15)
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16. A system, comprising:
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a processing unit; a capacitive sensor button; a timer circuit configured to generate a repetitive trigger signal; a low power oscillator block configured to generate an clock signal having a higher frequency than the repetitive trigger signal; a sensing block coupled with the timer circuit and the oscillator block and configured to, in response to the repetitive trigger signal, detect a presence of a conductive object at the capacitive sensor button by applying an excitation signal based on the clock signal to the capacitive sensor button during a measurement period; and a wake logic block coupled with the sensing block and configured to transition the processing unit from a low power consumption state to a high power consumption state in response to the sensing block detecting the presence of the conductive object at the capacitive sensor button. - View Dependent Claims (17, 18, 19, 20)
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Specification