| 摘要 |
PURPOSE: A system for realizing an ear jack combined with a charging jack is provided to commonly use an earphone connection terminal of an ear jack with a charging DC input terminal, thereby realizing two functions in one jack as reducing a mounting size and realizing an easy design property. CONSTITUTION: A combined jack(210) has plural terminals, passes a microphone signal through the first terminal, passes an earphone signal and a DC voltage through the second terminal, and outputs an earphone/microphone sensing signal to an MSM(240). A CODEC unit(220) processes the microphone signal, outputs a voice signal as the earphone signal to the combined jack(210), and is cut off from the combined jack(210) when the DC voltage is applied through the second terminal. A charging unit(230) is applied with the DC voltage through the second terminal to perform a charging function, outputs a charging sense signal to the MSM(240), and stops when an AC signal is inputted through the second terminal. The MSM(240) decides that an earphone/microphone module is inserted if the earphone/microphone sensing signal is inputted, and decides that a charging module is inserted if the charging sense signal is inputted.
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