Patent ID: 9332350
Filing Date: 2016-05-03
CPC Classification: H01R,H04R

Claim Text:
1. An earphone plugging and unplugging detection circuit, the circuit comprising: a left sound channel (L) pin, a first pin which can be connected and disconnected with the L pin, a right sound channel (R) pin and a second pin which can be connected and disconnected with the R pin, wherein the first pin forms a first normally closed connection with the L pin and the second pin forms a second normally closed connection with the R pin, and wherein: the circuit also comprises a left detection signal line connected with said first pin and a right detection signal line connected with the second pin, the left detection signal line and the right detection signal line are connected or configured with one of a pull-up resistor and a pull-down resistor respectively, and the L pin and the R pin are connected with the other of the pull-up resistor and the pull-down resistor respectively; wherein the left detection signal line is not electrically connected with the right detection signal line, such that when one of the first normally closed connection and the second normally closed connection fails, the circuit still correctly detects plugging and unplugging of an earphone, thereby effectively improving the reliability of the plugging and unplugging of the earphone.