Abstract: A battery charging device using an ear-microphone jack of a mobile apparatus. The battery charging device comprises a battery; an ear-microphone socket having a microphone contact, an earphone contact, and a common ground contact; a modem chip having a microphone input port connected to the microphone contact or an internal microphone and an earphone output port connected to the earphone contact or an internal speaker; and a cutting-off element connected between a power supply contact and the battery, for providing a charging voltage provided via the power supply contact to the battery and preventing a current from flowing backward from the battery to the modem chip. A power supply device comprises a plug having terminals connectable to contacts of the ear-microphone socket; and a power source connector for connecting a power supply source to the plug.

Abstract: A circuit for reducing leakage current in a processor of an electronic apparatus, the processor having a joint test action group (JTAG) test terminal, is disclosed, which includes an initialization test pin included in the JTAG test terminal; a reset pin of the processor; and a semiconductor device connected between the initialization test pin and the reset pin, wherein the initialization test pin, the reset pin, and the semiconductor device are arranged to enable forward current to flow from the initialization test pin to the reset pin through the semiconductor device.

Abstract: A battery charging device using an ear-microphone jack of a mobile apparatus. The battery charging device comprises a battery; an ear-microphone socket having a microphone contact, an earphone contact, and a common ground contact; a modem chip having a microphone input port connected to the microphone contact or an internal microphone and an earphone output port connected to the earphone contact or an internal speaker; and a cutting-off element connected between a power supply contact and the battery, for providing a charging voltage provided via the power supply contact to the battery and preventing a current from flowing backward from the battery to the modem chip. A power supply device comprises a plug having terminals connectable to contacts of the ear-microphone socket; and a power source connector for connecting a power supply source to the plug.

Abstract: A circuit for reducing leakage current in a processor of an electronic apparatus, the processor having a joint test action group (JTAG) test terminal, is disclosed, which includes an initialization test pin included in the JTAG test terminal; a reset pin of the processor; and a semiconductor device connected between the initialization test pin and the reset pin, wherein the initialization test pin, the reset pin, and the semiconductor device are arranged to enable forward current to flow from the initialization test pin to the reset pin through the semiconductor device.