Method for expanding USB (Universal Serial Bus) interface of mobile terminal into earphone interface

A USB interface and mobile terminal technology, applied to the structure of telephones, etc., can solve the problems of not being able to use the USB earphone cable, listen to music, etc., and achieve the effect of convenient debugging and testing and saving design costs

Inactive Publication Date: 2011-08-17
SHENZHEN SANG FEI CONSUMER COMM CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, when we use Micro USB, we will not be able to use the USB headphone cable to listen to music, but need to add an additional headphone port

Method used

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  • Method for expanding USB (Universal Serial Bus) interface of mobile terminal into earphone interface
  • Method for expanding USB (Universal Serial Bus) interface of mobile terminal into earphone interface
  • Method for expanding USB (Universal Serial Bus) interface of mobile terminal into earphone interface

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Embodiment Construction

[0021] Such as figure 2 As shown, in an embodiment of the method for expanding the USB interface of the mobile terminal into an earphone interface in the present invention, the Micro USB interface of the mobile terminal has five pins, which are successively charging (VBUS), data lines (D-, D+ ), ID and GND. The general standard headphone cable is composed of four wires: microphone (M), right channel (R), left channel (L), and ground wire. Generally, the mobile terminal USB and the earphone line rarely work at the same time, which provides the possibility for the two lines to share an interface in the mobile terminal.

[0022] At the USB interface of the mobile terminal, the R and D+ of the headset are multiplexed, the L and D- of the headset are multiplexed, and the M and ID of the headset are multiplexed. Use three single-pole double-throw analog switches to switch. Usually, the analog switch is in the earphone channel state by default. When the USB is detected, it will sw...

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Abstract

The invention relates to a method for expanding the USB (Universal Serial Bus) interface of a mobile terminal into an earphone interface, which comprises the following steps: at the USB interface of the mobile terminal, multiplexing the R and D+ of earphones, multiplexing the L and D- of the earphones, and multiplexing the M and ID of the earphones f; and arranging an analog switch on the mainboard of a mobile phone, wherein the analog switch is used for switching the earphone interface and the USB interface. According to the method, the USB interface is multiplexed into the earphone interface through the analog switch, the baseband platform of the mobile phone is not needed to provide interrupt or ADC (Analog Digital Converter) detection, therefore the method is suitable for different mobile terminal platforms, the design cost is reduced, and great convenience is provided for the debugging test of a design company and the normal use of a user.

Description

technical field [0001] The invention relates to the field of mobile communication, more specifically, to a method for extending a USB interface of a mobile terminal into an earphone interface. Background technique [0002] In the current Chinese mobile terminal market, the most common USB interface is the Mini 10pinUSB interface, such as figure 1 As shown, these 10 pins include charging line (VBUS), data transmission line (D-, D+), OTG function detection pin (ID / ACC), serial port download line (TX, RX) and audio interface (MIC , Speaker). [0003] In order to protect the environment and ensure the convenience of consumers, the European Commission of the European Union stated that from January 1, 2010, the European mobile phone charger standard will uniformly adopt the standard Micro5pin USB. Micro USB is a portable version of the USB 2.0 standard. The Mini USB interface used by some mobile terminals is even smaller. Micro USB is the next-generation specification of Mini-US...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M1/02H04M1/03
Inventor 熊年登郭云鹏李松穗
Owner SHENZHEN SANG FEI CONSUMER COMM CO LTD
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