Keypad
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 22, 2010
Grant Date -
Feb 22, 2007
app pub date -
Sep 25, 2006
filing date -
Apr 6, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A keypad is disclosed which has a plurality of keys (12) for the input of information. Each key has a first switch (80) and a second switch (90). The first switches (80) are all connected to a common electrical interconnection (120) and the second switches (90) are connected into a matrix electrical interconnection (62, 100). The microprocessor (66) detects a global signal on the common interconnection (120) and supplies scan signals to the matrix interconnection (62, 100) to enable detection of a particular key. The processor (66) may also selectively change the state of lines (62, 100) of the matrix and also maintain particular lines in a predetermined state by open drain ports of the processor to which the lines of the matrix are connected.
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