Low power capacitive sensor button

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...

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Bibliographic Details
Main Authors MAHARYTA ANDRIY, LIEPOLD CARL FERDINAND, KLEIN HANS
Format Patent
LanguageEnglish
Published 03.11.2015
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary: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.
Bibliography:Application Number: US201514667434