Universal serial bus keyboard control circuitry
US7102619B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 2003 |
| Grant date | Sep 5, 2006 |
| Priority date | — |
| Expiry date | Feb 15, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M11/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A keyboard control apparatus with a USB interface for use in a notebook computer having a number of keys. In one embodiment, a mapping unit is employed to store a number of key matrix codes corresponding to the keys. In accordance with a clock signal and a start signal, a shift register is capable of generating a reference signal and a number of scan output signals. A key matrix circuit then receives the scan output signals to provide a number of scan input signals. An address generator is used to generate an address signal based on the reference signal and a triggered scan input signal. Thus, a selector can select one key matrix code designated to the address signal from the mapping unit. Additionally, an interface converter further converts the selected key matrix code into a pair of differential signals compliant with the USB specification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.