Capacitive sensing
US10511305B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 2016 |
| Grant date | Dec 17, 2019 |
| Priority date | — |
| Expiry date | Jun 26, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960725
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In one embodiment, a device includes a multi-channel capacitive sensor and a control circuit. The control circuit is configured to ground a first sense capacitor and a second sense capacitor of the multi-channel capacitive sensor. The first sense capacitor and the second sense capacitor are adapted to be connected to a drive line. The control circuit is configured to charge, by a first voltage provided on a pin of the controller, an in-series combination of a sample capacitor and the first sense capacitor while not charging the second sense capacitor by the first voltage provided on the pin of the controller. The control circuit is further configured to measure a second voltage on the pin of the controller resulting at least in part from charging the in-series combination, the second voltage providing an indication of a capacitance of the first sense capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.