Earphone detecting circuit and portable electronic device using the same
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United States of America Patent
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May 31, 2016
Grant Date -
Jan 30, 2014
app pub date -
Jun 21, 2013
filing date -
Jul 26, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
An exemplary earphone detecting circuit includes a signal input terminal, a voltage dividing circuit, a detecting circuit, and a signal output terminal connected electronically in that order. The signal input terminal is connected to an earphone jack of a portable electronic device. The signal output terminal is connected to a microcontroller of the portable electronic device. When the portable electronic device receives a call, the signal input terminal receives a signal and transmits the received signal to the detecting circuit through the voltage dividing circuit, the detecting circuit processes the signal transmitted to the signal output terminal to be constant.
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