Apparatus and scanning method for key input apparatus
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United States of America Patent
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Feb 24, 2015
Grant Date -
Mar 28, 2013
app pub date -
Dec 30, 2011
filing date -
Sep 27, 2011
priority date (Note) -
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Abstract
A key input includes a keypad device and a micro controller unit. The keypad device has a matrix consisted of first signals lines, second signal lines, and switches located in corners which are formed by the first and the second signal lines, and a plurality of keys corresponding to the switches. The micro controller unit connects the first signal lines and the second lines and provides a pulse to the first signal line. When the switch is turned on by the key, the pulse is translated from the first signal line to the second signal line. Thus, the pulse is directly detected, so as to achieve the fast scanning and low sensitive impedance of carbon membrane efficient.
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