Reducing sleep current in a capacitance sensing system
US8144126B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 2007 |
| Grant date | Mar 27, 2012 |
| Priority date | — |
| Expiry date | Oct 12, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/022
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for reducing power consumption of capacitance sensing device in a reduce power mode. In one embodiment, the method includes individually measuring a capacitance on each of a plurality of sensor elements of a device, coupling a group of sensor elements of the plurality of sensor elements together when a presence of a conductive object is not detected on the plurality of sensor elements while individually measuring the capacitance on each of the plurality of sensor elements, and collectively measuring a capacitance on the group of sensor elements. In one embodiment, the apparatus includes a processing device, and a plurality of sensor elements that are individually coupled in a first mode and collectively coupled in a second mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.