Circuit capable of reusing universal serial bus (USB)/ universal asynchronous receiver/ transmitter (UART) interfaces and electronic device using same

A technology of interface multiplexing and USB data lines, which is applied in the field of electronic terminals, can solve problems such as the influence of the appearance of electronic equipment and the inability to meet the thinning requirements of electronic equipment, so as to achieve the effect of beautifying the appearance, meeting the thinning requirements, and reducing the number of interfaces

Active Publication Date: 2012-10-24
HUIZHOU TCL MOBILE COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If both a USB interface and a UART interface are installed on the electronic device, two interfaces need to be provided on the e...

Method used

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  • Circuit capable of reusing universal serial bus (USB)/ universal asynchronous receiver/ transmitter (UART) interfaces and electronic device using same
  • Circuit capable of reusing universal serial bus (USB)/ universal asynchronous receiver/ transmitter (UART) interfaces and electronic device using same
  • Circuit capable of reusing universal serial bus (USB)/ universal asynchronous receiver/ transmitter (UART) interfaces and electronic device using same

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Embodiment Construction

[0022] Please see first Figure 1 to Figure 3 ,in, figure 1 It is a schematic circuit diagram of a USB / UART interface multiplexing circuit according to an embodiment of the present invention, figure 2 It is a schematic circuit diagram of a USB / UART interface multiplexing circuit docked with a USB standard interface connected to a USB data line according to an embodiment of the present invention, image 3 It is a schematic circuit diagram of a USB / UART interface multiplexing circuit docked with a USB standard interface connected to a UART data line according to an embodiment of the present invention.

[0023] Such as figure 1 As shown, the USB / UART interface multiplexing circuit of the present invention includes an external interface 11 , a processing chip 12 , a first analog switch 13 , a second analog switch 14 and a voltage dividing circuit 15 .

[0024] Such as figure 2 As shown, the external interface 11 includes a first port 1, a second port 2 and a third port 3. Th...

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Abstract

An embodiment of the invention discloses a circuit capable of reusing universal serial bus (USB)/ universal asynchronous receiver/ transmitter (UART) interfaces an electronic device using the same. The circuit comprises an external interface, a processing chip, a first simulation switch, a second simulation switch and a voltage division circuit. The state of a first port of the external interface is utilized to judge whether a USB standard interface connected with a USB data line or a USB standard interface connected with a UART data line is plugged in. If the USB standard interface connected with the USB data line is judged to be plugged in, the first simulation switch and the second simulation switch are utilized to switch a path, a USB_DM pin for processing a chip is connected with a D+ line of the USB data line, a USB_DP pin is connected with a D- line of the USB data line, and transmission of USB data is achieved. If the USB standard interface connected with the UART data line is judged to be plugged in, the first simulation switch and the second simulation switch are utilized to switch the path, a URXT/ general purpose input/ output (GPIO) reuse pin for processing a chip is connected with an RXT line of the UART data line, a UTXD/ GPIO reuse pin is connected with a TXD line of the UART data line, and transmission of UART data is achieved. The circuit can reuse the USB interfaces and the UART interfaces, meets the requirement of the electronic device for thinness, reduces interface quantity, and is attractive in appearance.

Description

technical field [0001] The invention relates to the field of electronic terminals, in particular to a USB / UART interface multiplexing circuit and electronic equipment using the circuit. Background technique [0002] In electronic equipment, the USB (Universal Serial BUS, Universal Serial Bus) protocol, as a widely used data transmission method, is set in various electronic devices such as mobile phones, PDAs (Personal Digital Assistants, personal digital assistants), tablet computers, and notebooks. Among the devices, the electronic device is often provided with a USB interface for connecting a USB data line, so as to realize data transmission between the electronic device and the USB data line. The USB data line includes VBUS line, D+ line, D- line and GND port. In some improved USB data lines, an ID port is even provided. Among them, the VBUS line can provide a DC voltage of 5V, the D+ line and D- line are used to transmit differential data, the GND port is grounded, and ...

Claims

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Application Information

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IPC IPC(8): G06F13/40
Inventor 杨金华陈群
Owner HUIZHOU TCL MOBILE COMM CO LTD
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