Earphone plugging-unplugging detecting device of mobile terminal

The utility model discloses an earphone plugging-unplugging detecting device of a mobile terminal. The earphone plugging-unplugging detecting device comprises a tail plug, a voltage detection module, an interruption processing module and an earphone microphone bias voltage module, wherein an earphone is connected to the mobile terminal through the tail plug, an input pin of the voltage detection module is connected with a bias voltage resistance output end of the earphone microphone bias voltage module and an earphone microphone pin of the tail plug so as to detect the voltage of the earphone microphone pin, if the inputted voltage is higher than a threshold voltage, a high electric level is outputted, if the inputted voltage is lower than the threshold voltage, a low electric level is outputted, the interruption processing module triggers the plug-in interruption of the earphone after receiving the low electric level of the voltage detection module, and the earphone is judged not to plug in if the high electric level of the voltage detection module is received. The earphone plugging-unplugging detection device is free from utilizing an earphone plug of 3.5mm or 2.5mm and from occupying external interface pin resource, so that the cost and the resource are saved, the system structure is simplified and the layout difficulty is reduced.