Bluetooth earphone with multiplexing of USB (Universal Serial Bus) interface

Abstract

The invention provides a Bluetooth earphone with multiplexing of an USB (Universal Serial Bus) interface. The Bluetooth earphone comprises the USB interface, a charging management circuit, a microphone circuit, an pull-up resistor, a logical judgment circuit and an analog selecting switch, wherein the microphone circuit is electrically connected with a fourth pin and capable of inputting audio signals, and can serve as a divider resistor when external equipment is audio equipment; the fourth pin is connected to a bias power supply of a microphone through the pull-up resistor and synchronously and electrically connected with the input end of the logical judgment circuit for providing a voltage value belonging to the type of the external equipment to the logical judgment circuit; the control output end of the logical judgment circuit is electrically connected with the control input end of an analog switch, and the logical judgment circuit is used for controlling the selection output of the analog switch according to the received voltage value belonging to the type of the external equipment; and the analog selecting switch is used for selecting data transmission or audio output under the control of the logical judgment circuit. The Bluetooth earphone can realize the audio input / output function and the charging function by virtue of the audio interface, so that the quantity of outside interfaces is reduced, the product is nicer, the interface devices are saved, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of interface multiplexing, in particular to a bluetooth earphone with USB interface multiplexing data transmission, audio input and output and charging functions. Background technique [0002] Electronic products generally require one or more external interfaces that implement different functions, such as data transmission interfaces, audio (input and output) interfaces, charging interfaces, and other interfaces. Existing electronic products are getting smaller and smaller, and more and more functions are implemented, so electronic products need more and more interfaces to meet their functional requirements. [0003] Take Bluetooth headsets as an example, such as the usual mono or multi-channel ear-hook Bluetooth headsets, due to their small size, the battery is built into the Bluetooth headset, so it needs at least one charging interface, and this charging interface can have multiple There are two forms, s...

AI Technical Summary

Problems solved by technology

However, due to the volume and appearance requirements of the product itself, it is usually not and should not be installed with too many external interfaces on the earphones, and generally multiple interfaces will not be installed at the same time; while earphones with multiple interfaces at the same time, their appearance and structure It will also appear to have multiple external physical interfaces, which is not conducive to the aesthetics of the appearance of the headset

[0004] In today's pursuit of smaller and smaller electronic products, because the product itself is limited in size, in the case of tight structural space, more physical interfaces will inevitably waste the structural space of the product to a large extent, thereby hindering the product volume. Further shrinking; at the same time, too many interface devices will increase the cost of electronic products, and multiple external interfaces will also affect the appearance of the product

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