Device and method for communicating through universal serial bus (USB) interface and charging external device

Abstract

The invention provides a device and a method for communicating through a universal serial bus (USB) interface and charging an external device. By the aid of the device and the method, the problem that in an existing technology, the USB interface cannot be used for communicating is solved, and the quick charging is achieved. A current detecting circuit is respectively connected with a management module, a current source and the USB interface. According to current output of the current source, a first detection signal is output, the management module outputs a second control signal, a first control signal is delayed to output in accordance with the first detection signal, and a shift switch which is connected with the management module is used for short-circuiting two USB data lines of the USB interface in accordance with the second control signal and for disconnecting two short-circuited USB data lines of the USB interface in accordance with the first control signal. After being inserted, a device to be charged is controlled by the management module, two short-circuited USB data lines are disconnected in delay, the device to be charged selects an adaptor of a large current mode to be charged quickly, and the communication is achieved through the USB data lines.

Description

technical field [0001] The invention relates to the technical field of USB, in particular to a device and method for communicating and charging external equipment through a USB interface. Background technique [0002] As a standard protocol interface, USB has become the standard interface adopted by various peripherals because of its features such as supporting mass data transmission and hot plugging. At present, with the rapid development of the wireless communication field, a variety of communication devices, such as personal handheld phones, business communication, tablet products, etc., are also more and more widely used by users. The USB interface has also become the preferred interface for these devices because of its standardization and ease of implementation. [0003] At the same time, most mobile communication devices are powered by batteries, so the batteries need to be charged. In some mobile communication devices, USB ports are usually used for charging. The int...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a device and method for communicating through a USB interface and charging an external device to solve the problem in the prior art that the USB interface cannot be used for communication and fast charging at the same time. The device includes: The USB interface provides the current source of the adapter mode current, and its current output port is directly connected with the current input port of the current detection circuit;

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