The invention provides an earphone key detecting device, which comprises a microphone, a vocal tract, a signal line, a field effect tube and a detection signal line. Channel signal line of the microphone can jump from high level to low level; the gate of the NMOS transistor is connected to the microphone signal line, the NMOS FET grounded source; the drain with a resistor NMOS FET pull-up branch is connected, on the other hand connected with the detection signal line; detecting the signal line in the low level jump to high level, generating an interrupt signal. The invention also provides an earphone key detecting method and a mobile terminal applying the earphone key detection device. The invention saves CPU resources and reduces detection cost, development cost and detection time.
【技术实现步骤摘要】
【技术保护点】
１．一种耳机按键检测装置，其包括麦克风声道信号线，其特征在于，该装置还包括ＮＭＯＳ场效应管和检测信号线；所述麦克风声道信号线可从高电平跳变到低电平；所述ＮＭＯＳ场效应管的栅极连接至麦克风声道信号线，所述ＮＭＯＳ场效应管的源极接地；所述ＮＭＯＳ场效应管的漏极一方面与电阻上拉支路相连，另一方面连接所述检测信号线；所述检测信号线在从低电平跳到高电平时，产生中断信号。
【技术特征摘要】
【专利技术属性】
技术研发人员：王亚辉，
申请(专利权)人：惠州TCL移动通信有限公司，
类型：发明
国别省市：44
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