Low power capacitive sensor button
US9176636B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2015 |
| Grant date | Nov 3, 2015 |
| Priority date | — |
| Expiry date | Mar 24, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960775
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.