Configurable analog front-end for mutual capacitance sensing and self capacitance sensing
US9523725B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 2, 2014 |
| Grant date | Dec 20, 2016 |
| Priority date | — |
| Expiry date | Mar 24, 2035 |
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 switching circuit responsive to mutual mode control signals for a controlling signal supplied from a capacitive touch matrix to the capacitive 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.