Title:
KEYPAD SCANNER
Document Type and Number:
WIPO Patent Application WO2003030375
Kind Code:
A3
Abstract:
A keypad arrangement is disclosed comprising a scanning unit (30) having a certain number of port line terminals (1 to 11) and a number of sensor cells (21) arranged in half-matrix structure having rows (23) and columns (22) whereby the number of columns (22) and the number of rows (23) each are less than the number of port line terminals. In comparison to normal detection systems, the given detection system allows a significant reduction of the port line terminals required to scan a given number of sensor cells. The device described is preferably applicable in communication devices.
Inventors:
ERDMANN MARTIN
NAIR VINOD NAIR GOPIKUTTAN
SHALIGRAM AMIT SADASHIV
NAIR VINOD NAIR GOPIKUTTAN
SHALIGRAM AMIT SADASHIV
Application Number:
PCT/EP2002/010597
Publication Date:
December 04, 2003
Filing Date:
September 20, 2002
Export Citation:
Assignee:
INFINEON TECHNOLOGIES AG (DE)
International Classes:
H03M11/20; (IPC1-7): H03M11/20
Foreign References:
| US5856794A | 1999-01-05 | |||
| EP0497049A1 | 1992-08-05 | |||
| US5805085A | 1998-09-08 |
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