Electrical matrix keyboard scanning circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 31, 1995
Grant Date -
N/A
app pub date -
Mar 11, 1994
filing date -
Mar 11, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Disclosed is a scanning circuit for an electrical matrix keyboard. The keyboard has extended keys on a voltage line and a ground line. Two extended line detector are incorporated into the circuit for detecting the extended keys without increasing input and output ports of the circuit, so that the circuit can be integrated into a chip at a lower cost.
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