Mobile phone interface multiplexing circuit based on standard micro USB interface

Abstract

The invention provides a mobile phone interface multiplexing circuit based on a standard micro USB interface. The mobile phone interface multiplexing circuit comprises an interface device and an analog switch, wherein the second and the third pins of the interface device are respectively connected with the eighth and the seventh pins on the common end of the analog switch; the fourth pin of the interface device is connected with the MIC input terminal of an earphone of a baseband processor through a first magnetic bead; the fifth pin of the interface device is connected with the signal ground through a second magnetic bead; the first pin of the analog switch is connected with a positive signal terminal of the baseband processor, the twelfth pin of the analog switch is connected with the negative signal terminal of the baseband processor; the second and the third pins of the analog switch are respectively connected with the stereo output terminal of the earphone of the baseband processor through a third magnetic bead and a fourth magnetic bead; the fourth and the fifth pins of the analog switch are respectively connected with a serial transceiving terminal of the baseband processor through a first diode and a second diode; the sixth pin of the analog switch is connected with the signal ground; the ninth and the tenth pins of the analog switch are connected with an analog switch control circuit; and the eleventh pin of the analog switch is connected with a power source.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a mobile phone interface multiplexing circuit based on a standard Micro USB interface. Background technique [0002] Existing mobile phones, portable media players (PMP), mobile Internet devices (MID) and other portable products require a variety of interfaces to provide data connections, audio and video outputs, internal programming and firmware upgrades, and lithium battery charging. In addition to the USB data interface and the standard 3.5mm or 2.5mm headphone audio interface, various companies use a variety of interface mechanisms and their own specific interface pin definitions. As a result, a large number of various incompatible chargers, data cables and other accessories have been produced. [0003] For example: a typical interface solution for existing mobile phones is that the USB and serial ports are multiplexed with an 8-pin or 10-pin flat head connector, and ...

AI Technical Summary

Problems solved by technology

[0003] For example: a typical interface solution for existing mobile phones is that the USB and serial ports are multiplexed with an 8-pin or 10-pin flat head connector, and the earphone uses a single four-segment socket. Some mobile phones can also see a 20-pin connector. Connectors to realize various functional interfaces, so it is a waste of space and cost

Another problem is that the definitions of these complicated interfaces are not uniform, which leads to the inability to use common accessories and wastes resources.

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