Configurable analog front-end for mutual capacitance sensing and self capacitance sensing
US8976151B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 18, 2012 |
| Grant date | Mar 10, 2015 |
| Priority date | — |
| Expiry date | Jan 29, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04104
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Capacitance sensing circuits and methods are provided. A dual mode capacitance sensing circuit includes a capacitance-to-voltage converter having an amplifier and an integration capacitance coupled between an output and an inverting input of the amplifier, and a dual mode switching circuit responsive to mutual mode control signals for a controlling signal supplied from a capacitive touch matrix to the capacitance-to-voltage converter in a mutual capacitance sensing mode and responsive to self mode control signals for controlling signals supplied from the capacitive touch matrix to the capacitance-to-voltage converter in a self capacitance sensing mode, wherein the capacitance sensing circuit is configurable for operation in the mutual capacitance sensing mode or the self capacitance sensing mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.