公开(公告)号：US20140139046A1

公开(公告)日：2014-05-22

申请号：US13995365

申请日：2012-02-09

Applicant: ST-ERICSSON SA

Inventor： Gajendranath Chowdary ,  Ravpreet Singh ,  Shyam Somayajula

IPC: H04R3/00 ,  H02J7/00

CPC classification number: H04R3/00 ,  H02J7/0042 ,  H02J7/0055 ,  H04R2410/00 ,  Y10T307/858

Abstract: An electrical interface circuit is disclosed. The circuit comprises a microphone circuit (100); a battery charger circuit (200); and an electrical connector (300) for connecting said electrical interface circuit to an external device. The electrical connector has a pin (302) on which signals are multiplexed for connecting either the battery charger circuit to an external supply voltage or the microphone circuit to an external microphone. The battery charger circuit comprises an amplifying circuit (202) for controlling voltage or current to a battery (400) at battery charging and a p-type power transistor. The pin is connected to the microphone circuit and to a source of the p-type power transistor, and when a voltage applied to the pin exceeds the battery voltage, the p-type power transistor will provide current from the pin to the charger circuit, and otherwise the charger circuit and battery is disconnected from the pin. A method of multiplexing signals on the electrical interface circuit is also disclosed.

Abstract translation: 公开了一种电接口电路。 该电路包括麦克风电路（100）; 电池充电器电路（200）; 以及用于将所述电接口电路连接到外部设备的电连接器（300）。 电连接器具有引脚（302），信号被多路复用以将电池充电器电路连接到外部电源电压或麦克风电路连接到外部麦克风。 电池充电器电路包括用于在电池充电期间控制电池（400）的电压或电流的放大电路（202）和p型功率晶体管。 引脚连接到麦克风电路和p型功率晶体管的源极，并且当施加到引脚的电压超过电池电压时，p型功率晶体管将从引脚向充电器电路提供电流， 否则充电器电路和电池与引脚断开连接。 还公开了一种在电接口电路上复用信号的方法。