Detection circuit and detecting method thereof
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United States of America Patent
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Apr 24, 2018
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app pub date -
Mar 17, 2015
filing date -
Mar 17, 2015
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Abstract
A detection circuit is used to detect a connection state between a first signal port of an electronic device and a first external device. The detection circuit includes a signal generator, a switch module, a signal detector, and a processing unit. The signal generator generates a test signal. During a test process, the signal generator is electrically connected to the first signal port by the switch module, such that the test signal is sent to the first signal port to test the connection state of the first signal port. The signal detector produces a detection signal according to the connection state of the first signal port. The processing unit determines the state of connection between the first signal port and the first external device by comparing the voltage of the detection signal with a threshold value.
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