SINGLE-WIRE KEYPAD MODULAR STRUCTURE
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United States of America Patent
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Issued Date -
Jan 23, 2014
app pub date -
Jul 15, 2013
filing date -
Jul 19, 2012
priority date (Note) -
Abandoned
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Abstract
A single-wire keypad modular structure provided with keys used in electronics device and comprising: a keypad module and a data signal transformation module; and said keypad module further comprising a number of resistances electrically connected to each other in series and a number of keys electrically connected to each other in parallel wherein (1) each of the keys links a live end and a ground end and is situated between two resistances for forming a voltage change between distinct keys and (2) the live ends are electrically connected to each other; a data signal transformation module which is based on single-wire input circuits for electrically connecting the keypad module's ground end and transform the changed input voltages to digital data signals and output to a control module for execution of corresponding functions when any of the keys is pressed down.
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