CN212112459U - Circuit for multiplexing USB connector with USB and UART - Google Patents
Circuit for multiplexing USB connector with USB and UART Download PDFInfo
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- CN212112459U CN212112459U CN202021226744.2U CN202021226744U CN212112459U CN 212112459 U CN212112459 U CN 212112459U CN 202021226744 U CN202021226744 U CN 202021226744U CN 212112459 U CN212112459 U CN 212112459U
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Abstract
The utility model discloses a circuit of USB and the multiplexing USB connector of UART, including analog switch U1 and USB connector J802, analog switch U1's 9 feet connect 2 feet and diode T10 of USB connector J802, analog switch U1's 3 feet connect 3 feet and diode T6 of USB connector J802, diode T7 and power VBUS are connected to USB connector J802's 1 foot, analog switch U1's 4 feet are connected 8 feet of analog switch U1, resistance R20 and resistance R19, power VBUS is connected to resistance R20's the other end, the utility model discloses the circuit of USB and the multiplexing USB connector of UART effectively utilizes simple analog switch to utilize the VBUS drive of USB, the automatic switching of USB and UART on the connector that realizes of hardware, the circuit is simple, low cost. The requirement of the UART function of the functional mobile phone is well met.
Description
Technical Field
The utility model relates to a cell-phone technical field specifically is a circuit of multiplexing USB connector of USB and UART.
Background
In the existing scheme, a connector with more PINs is generally adopted to realize that the USB and the UART use the same connector, and the greatest defect of the connector with more PINs is that a user cannot use a universal USB data line.
The current functional mobile phone, if needing external UART equipment, must introduce the signal to the connector for use. But at present, all function machines use standard MICRO USB connectors, and there are no more PINs to access UART signals.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a circuit of the multiplexing USB connector of USB and UART to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a circuit for multiplexing USB connectors of USB and UART comprises an analog switch U1 and a USB connector J802, wherein a pin 9 of the analog switch U1 is connected with a pin 2 of the USB connector J802 and a diode T10, a pin 3 of the analog switch U1 is connected with a pin 3 of the USB connector J802 and a diode T6, a pin 1 of the USB connector J802 is connected with a diode T7 and a power supply VBUS, a pin 4 of the analog switch U1 is connected with a pin 8 of the analog switch U1, a resistor R20 and a resistor R19, and the other end of the resistor R20 is connected with the power supply VBUS.
As a further technical solution of the present invention: the model of the analog switch U3 is SGM4717 EP.
As a further technical solution of the present invention: the diode T6 is a TVS diode.
As a further technical solution of the present invention: the diode T7 is a TVS diode.
As a further technical solution of the present invention: the diode T10 is a TVS diode.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses the circuit of the multiplexing USB connector of USB and UART effectively utilizes simple analog switch to utilize USB's VBUS drive, the switching of USB and UART on the connector is realized automatically to the hardware, and the circuit is simple, low cost. The requirement of the UART function of the functional mobile phone is well met.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, embodiment 1, a circuit for multiplexing USB and UART connectors includes an analog switch U1 and a USB connector J802, where pin 9 of the analog switch U1 is connected to pin 2 of the USB connector J802 and a diode T10, pin 3 of the analog switch U1 is connected to pin 3 of the USB connector J802 and a diode T6, pin 1 of the USB connector J802 is connected to a diode T7 and a power source VBUS, pin 4 of the analog switch U1 is connected to pin 8 of the analog switch U1, a resistor R20 and a resistor R19, and the other end of the resistor R20 is connected to the power source VBUS.
As shown in FIG. 1, the common terminal of the analog switch U1 is connected to the USB connector J802, the normally open terminal is connected to the USB DP/DM, and the normally closed terminal is connected to the TX/RX of the UART. The USB connector is connected with UART by default. The control interface of the analog switch is connected with the voltage division of the VBUS, when the USB line is inserted, the VBUS of the power supply is connected to cause the analog switch to act, and the public end is connected to the DP/DM to achieve the purpose of using the USB interface. When the serial port line is inserted, the analog switch does not act, and a UART interface is used at the moment. Thus, the purpose of multiplexing the connector is achieved.
Example 2: on the basis of embodiment 1, the model number of the analog switch U3 is SGM4717 EP. The diode T6 is a TVS diode. The diode T7 is a TVS diode. The diode T10 is a TVS diode.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A circuit for multiplexing USB connectors of USB and UART comprises an analog switch U1 and a USB connector J802, and is characterized in that a pin 9 of the analog switch U1 is connected with a pin 2 of the USB connector J802 and a diode T10, a pin 3 of the analog switch U1 is connected with a pin 3 of the USB connector J802 and a diode T6, a pin 1 of the USB connector J802 is connected with a diode T7 and a power supply VBUS, a pin 4 of the analog switch U1 is connected with a pin 8 of the analog switch U1, a resistor R20 and a resistor R19, and the other end of the resistor R20 is connected with the power supply VBUS.
2. The circuit of claim 1, wherein the analog switch U3 is model SGM4717 EP.
3. The circuit of claim 1, wherein the diode T6 is a TVS diode.
4. The circuit of claim 1, wherein the diode T7 is a TVS diode.
5. The circuit of claim 4, wherein the diode T10 is a TVS diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021226744.2U CN212112459U (en) | 2020-06-29 | 2020-06-29 | Circuit for multiplexing USB connector with USB and UART |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021226744.2U CN212112459U (en) | 2020-06-29 | 2020-06-29 | Circuit for multiplexing USB connector with USB and UART |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212112459U true CN212112459U (en) | 2020-12-08 |
Family
ID=73628021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021226744.2U Active CN212112459U (en) | 2020-06-29 | 2020-06-29 | Circuit for multiplexing USB connector with USB and UART |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212112459U (en) |
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2020
- 2020-06-29 CN CN202021226744.2U patent/CN212112459U/en active Active
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