Multiplexing circuit for converting serial interface into USB-HID protocol interface

Abstract

The utility model provides a multiplex circuit for converting a serial interface into a USB-HID protocol interface. The multiplex circuit comprises integrated circuits U2 to U3, capacitors C1 to C5, resistors R1 to R13, light emitting diodes D1 to D3, a resettable fuse F1, a female header connector U1, a pin connector CN1 and USB connectors USB1-USB2. The model of the integrated circuit U2 is CH9329; the model number of the integrated circuit U3 is AMS1117-3. 3; a contact 1 of the female header connector U1 is respectively connected with a 3.3 V power supply network and a resistor R1, and a contact 2 of the female header connector U1 is simultaneously connected with an integrated circuit U2, a resistor R9 and a resistor R10; a contact 3 of the female header connector U1 is connected with the integrated circuit U2, the resistor R8 and the resistor R11 at the same time. The circuit can be widely applied to wired and wireless access of devices such as serial port keyboards, mice, code scanning guns and the like to computer devices, and the adaptability of various products is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of control circuits, and in particular relates to a serial interface to USB-HID protocol interface multiplexing circuit. Background Art

[0002] As a common data transmission interface, the serial communication interface is widely used in various circuits to realize data communication between electronic components or circuit modules due to its simple protocol and easy implementation. Although it has many advantages, most computer devices have cancelled the separate serial communication interface due to the slow transmission rate. Therefore, when it is necessary to connect the computer device through the serial interface, a peripheral circuit is often required to convert the serial port protocol and connect it through the computer USB interface. At the same time, based on different technical solutions, the computer device is sometimes required to install related driver software. In this case, the versatility and generality of serial communication are poor, and the same hardware circuit cannot meet the communication between computer devices on different platforms. Summary of the invention

[0003] In view of this, the utility model aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a serial interface to USB-HID protocol interface multiplexing circuit, which converts the serial communication protocol into the HID (Human Interface Devices) communication protocol in the USB protocol family and realizes driver-free access to computer devices on different platforms through wired and wireless access, thereby effectively improving the application scope of serial communication.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A serial interface to USB-HID protocol interface multiplexing circuit, including integrated circuits U2-U3, capacitors C1-C5, resistors R1-R13, light-emitting diodes D1-D3, a resettable fuse F1, a female connector U1, a pin connector CN1, and USB connectors USB1-USB2; the model of the integrated circuit U2 is CH9329; the model of the integrated circuit U3 is AMS1117-3.3;

[0006] The contact 1 of the female connector U1 is respectively connected to the 3.3V power supply network +3V3 and the first end of the resistor R1, and the second end of the resistor R1 is connected to the contact 4 of the female connector U1; the contact 2 of the female connector U1 is simultaneously connected to the pin 7 of the integrated circuit U2, the first end of the resistor R9 and the first end of the resistor R10; the contact 3 of the female connector U1 is simultaneously connected to the pin 8 of the integrated circuit U2, the first end of the resistor R8 and the first end of the resistor R11; the contacts 5 and 6 of the female connector U1 are simultaneously connected to the ground network GND;

[0007] Pin 1 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D2, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; Pin 2 of the integrated circuit U2 is connected to the first end of the resistor R12; Pin 3 of the integrated circuit U2 is connected to the first end of the resistor R3; Pin 4 of the integrated circuit U2 is connected to the first end of the resistor R4; Pin 5 of the integrated circuit U2 is connected to the first end of the resistor R13; Pin 6 of the integrated circuit U2 is connected to contact 2 of the pin connector CN1; Pin 9 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; Pin 1 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; Pin 2 of the integrated circuit U2 is connected to the first end of the resistor R12; Pin 3 of the integrated circuit U2 is connected to the first end of the resistor R3; Pin 4 of the integrated circuit U2 is connected to the first end of the resistor R4; Pin 5 of the integrated circuit U2 is connected to the first end of the resistor R13; Pin 6 of the integrated circuit U2 is connected to contact 2 of the pin connector CN1; Pin 7 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; The positive electrode of D1 is connected to the first end of the resistor R2; the pin 10 of the integrated circuit U2 is connected to the contact 3 of the pin connector CN1; the pin 11 of the integrated circuit U2 is connected to the contact 1 of the pin connector CN1; the pin 12 of the integrated circuit U2 is connected to the contact 3 of the USB connector USB2; the pin 13 of the integrated circuit U2 is connected to the contact 2 of the USB connector USB2; the pin 15 of the integrated circuit U2 is connected to the 5V power supply network +5VA; the pin 16 of the integrated circuit U2 is simultaneously connected to the second end of the resistor R2, the second end of the resistor R5 and the first end of the capacitor C1;

[0008] Pin 2 of the integrated circuit U3 is simultaneously connected to the positive electrode of the polarity capacitor C4, the first end of the capacitor C5 and connected to the 3.3V power supply network +3V3; Pin 3 of the integrated circuit U3 is connected to the first end of the resistor R7, and the second end of the resistor R7 is connected to the 5V power supply network +5VA; Pin 1 of the integrated circuit U3 is connected to the ground network GND;

[0009] Contact 1 of the USB connector USB1 is connected to the 3.3V power network +3V3; Contact 2 of the USB connector USB1 is connected to the second end of resistor R8 and the second end of resistor R10 at the same time; Contact 3 of the USB connector USB1 is connected to the second end of resistor R9 and the second end of resistor R11 at the same time. Contact 1 of the USB connector USB2 is connected to the 5V power network +5V; Contacts 4 and 5 of the USB connector USB1 are connected to the ground network GND at the same time. Contacts 4 and 5 of the USB connector USB2 are connected to the ground network GND at the same time;

[0010] The first end of the resettable fuse F1 is connected to the 5V power supply network +5V, and the second end of the resettable fuse F1 is simultaneously connected to the positive electrode of the polarity capacitor C2, the first end of the capacitor C3, the first end of the resistor R6 and connected to the 5V power supply network +5VA; the second end of the resistor R6 is connected to the positive electrode of the light-emitting diode D3;

[0011] The contact 4 of the pin connector CN1 is connected to the ground network GND; the second end of the resistor R3, the second end of the resistor R4, the second end of the resistor R12 and the second end of the resistor R13 are simultaneously connected to the ground network GND. The negative electrode of the polar capacitor C2, the negative electrode of the polar capacitor C4, the second end of the capacitor C3 and the second end of the capacitor C5 are simultaneously connected to the ground network GND. The negative electrode of the light emitting diode D3 is connected to the ground network GND.

[0012] Furthermore, the pin spacing of the female connector U1 is 2.0 mm.

[0013] Furthermore, the capacitance of the capacitor C1 is 10uF, the capacitance of the capacitors C3 and C5 is 0.1uF, and the polar capacitors C2 and C4 are electrolytic capacitors with a capacitance of 10uF.

[0014] Furthermore, the resistance values ​​of the resistors R1, R3, R4, R7, R8, R9, R10, R11, R12, and R13 are 0Ω, the resistance values ​​of the resistors R2 and R5 are 3.3KΩ, and the resistance value of the resistor R6 is 4.7KΩ.

[0015] Furthermore, the light emitting diodes D1 and D2 are green light emitting diodes, and the light emitting diode D3 is a red light emitting diode.

[0016] Furthermore, the maximum input voltage of the resettable fuse F1 is 13.2V and the maximum allowable current is 500mA.

[0017] Furthermore, the USB connectors USB1 and USB2 are type-A male connectors.

[0018] Furthermore, the model of the pin connector CN1 is SH1.0-4P female socket.

[0019] Compared with the prior art, the serial interface to USB-HID protocol interface multiplexing circuit described in the utility model has the following advantages:

[0020] Through the circuit of the utility model, under the same circuit design, through simple component configuration, the wired and wireless conversion of the serial interface to the USB-HID protocol interface can be realized, which can be widely used for the wired and wireless access of serial port keyboards, mice, barcode scanners and other devices to computer devices, thereby improving the adaptability of various products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0022] Figure 1 The utility model is a circuit schematic diagram of a serial interface to USB-HID protocol interface multiplexing circuit. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0024] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0027] like Figure 1 As shown, the utility model provides a serial interface to USB-HID protocol interface multiplexing circuit, including integrated circuits U2-U3, capacitors C1-C5, resistors R1-R13, light-emitting diodes D1-D3, a resettable fuse F1, a female connector U1, a pin connector CN1, and USB connectors USB1-USB2. The model of the integrated circuit U2 is CH9329, and the model of the integrated circuit U3 is AMS1117-3.3.

[0028] Specifically, contact 1 of the female connector U1 is respectively connected to the 3.3V power supply network +3V3 and the first end of the resistor R1, and the second end of the resistor R1 is connected to contact 4 of the female connector U1; contact 2 of the female connector U1 is simultaneously connected to pin 7 of the integrated circuit U2, the first end of the resistor R9, and the first end of the resistor R10; contact 3 of the female connector U1 is simultaneously connected to pin 8 of the integrated circuit U2, the first end of the resistor R8, and the first end of the resistor R11. Pin 1 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D2, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; Pin 2 of the integrated circuit U2 is connected to the first end of the resistor R12; Pin 3 of the integrated circuit U2 is connected to the first end of the resistor R3; Pin 4 of the integrated circuit U2 is connected to the first end of the resistor R4; Pin 5 of the integrated circuit U2 is connected to the first end of the resistor R13; Pin 6 of the integrated circuit U2 is connected to contact 2 of the pin connector CN1; Pin 9 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; Pin 1 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; Pin 2 of the integrated circuit U2 is connected to the first end of the resistor R12; Pin 3 of the integrated circuit U2 is connected to the first end of the resistor R3; Pin 4 of the integrated circuit U2 is connected to the first end of the resistor R4; Pin 5 of the integrated circuit U2 is connected to the first end of the resistor R13; Pin 6 of the integrated circuit U2 is connected to contact 2 of the pin connector CN1; Pin 7 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; The positive electrode of D1 is connected to the first end of the resistor R2; the pin 10 of the integrated circuit U2 is connected to the contact 3 of the pin connector CN1; the pin 11 of the integrated circuit U2 is connected to the contact 1 of the pin connector CN1; the pin 12 of the integrated circuit U2 is connected to the contact 3 of the USB connector USB2; the pin 13 of the integrated circuit U2 is connected to the contact 2 of the USB connector USB2; the pin 15 of the integrated circuit U2 is connected to the 5V power supply network +5VA; the pin 16 of the integrated circuit U2 is simultaneously connected to the second end of the resistor R2, the second end of the resistor R5 and the first end of the capacitor C1. The pin 2 of the integrated circuit U3 is simultaneously connected to the positive electrode of the polar capacitor C4, the first end of the capacitor C5 and connected to the 3.3V power supply network +3V3; the pin 3 of the integrated circuit U3 is connected to the first end of the resistor R7, and the second end of the resistor R7 is connected to the 5V power supply network +5VA. Contact 1 of the USB connector USB1 is connected to the 3.3V power network +3V3; Contact 2 of the USB connector USB1 is connected to the second end of resistor R8 and the second end of resistor R10 at the same time; Contact 3 of the USB connector USB1 is connected to the second end of resistor R9 and the second end of resistor R11 at the same time. Contact 1 of the USB connector USB2 is connected to the 5V power network +5V. The first end of the resettable fuse F1 is connected to the 5V power network +5V, and the second end of the resettable fuse F1 is connected to the positive electrode of the polarity capacitor C2, the first end of the capacitor C3, the first end of the resistor R6 and connected to the 5V power network +5VA; the second end of the resistor R6 is connected to the positive electrode of the light-emitting diode D3. Contacts 5 and 6 of the female connector U1 are connected to the ground network GND at the same time. Pin 1 of the integrated circuit U3 is connected to the ground network GND. Contact 4 of the pin connector CN1 is connected to the ground network GND.The contact 4 and the contact 5 of the USB connector USB1 are simultaneously connected to the ground network GND. The contact 4 and the contact 5 of the USB connector USB2 are simultaneously connected to the ground network GND. The second end of the resistor R3, the second end of the resistor R4, the second end of the resistor R12 and the second end of the resistor R13 are simultaneously connected to the ground network GND. The negative electrode of the polar capacitor C2, the negative electrode of the polar capacitor C4, the second end of the capacitor C3 and the second end of the capacitor C5 are simultaneously connected to the ground network GND. The negative electrode of the light emitting diode D3 is connected to the ground network GND.

[0029] Specifically, the pin spacing of the female connector U1 is 2.0 mm.

[0030] Specifically, the capacitance of the capacitor C1 is 10uF, the capacitance of the capacitors C3 and C5 is 0.1uF, and the polar capacitors C2 and C4 are electrolytic capacitors with a capacitance of 10uF.

[0031] Specifically, the resistance values ​​of the resistors R1, R3, R4, R7, R8, R9, R10, R11, R12, and R13 are 0Ω, the resistance values ​​of the resistors R2 and R5 are 3.3KΩ, and the resistance value of the resistor R6 is 4.7KΩ.

[0032] Specifically, the light emitting diodes D1 and D2 are green light emitting diodes, and the light emitting diode D3 is a red light emitting diode.

[0033] Specifically, the maximum input voltage of the resettable fuse F1 is 13.2V, and the maximum allowable current is 500mA.

[0034] Specifically, the USB connectors USB1 and USB2 are type-A male connectors.

[0035] Specifically, the model of the pin connector CN1 is SH1.0-4P female socket.

[0036] When the circuit of the utility model is used to realize the wired conversion of the serial interface to the USB-HID protocol interface, the resistor R7, the resistor R10, the resistor R11, the female header U1, the integrated circuit U3, the polar capacitor C4, and the capacitor C5 in the circuit do not need to be connected to the circuit (the above components do not need to be soldered in the circuit board). At this time, the serial port signal line is connected through the USB connector USB1 (wherein, the contact 2 is connected to the RX line, and the contact 3 is connected to the TX line), and the USB connector USB2 is connected to the USB host device and can be identified as a USB-HID slave device.

[0037] When the circuit of the utility model is used to realize the wireless conversion of the serial interface to the USB-HID protocol interface, this circuit needs to be used in pairs. At one end, the integrated circuit U2-U3, capacitors C1-C5, resistors R1-R9, resistors R12-R13, light-emitting diodes D1-D3, self-recovery fuse F1, pin connector CN1, and USB connector USB2 do not need to be connected to the circuit (the above components do not need to be soldered in the circuit board), and the USB connector USB1 connects to the serial port signal line (wherein, contact 2 connects to the TX line, and contact 3 connects to the RX line); at the other end, the USB connector USB1 and resistors R8-R11 do not need to be connected to the circuit (the above components do not need to be soldered in the circuit board), and the USB connector USB2 connects to the USB host device. At this time, when the common commercially available serial wireless transmission modules (for example: JDY-41, Hummingbird Wireless TR2, etc.) are connected to the female headers at both ends, the wireless conversion of the serial interface to the USB-HID protocol interface can be realized.

[0038] In the above two uses, by changing the placement of resistors R3, R4, R13, and R12, the USB-HID slave device type and serial port communication protocol can be changed to meet the needs of most application scenarios.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A serial interface to USB-HID protocol interface multiplexing circuit, characterized in that: It includes integrated circuits U2-U3, capacitors C1-C5, resistors R1-R13, light-emitting diodes D1-D3, a resettable fuse F1, a female connector U1, a pin connector CN1, and USB connectors USB1-USB2; the model of the integrated circuit U2 is CH9329; the model of the integrated circuit U3 is AMS1117-3.3; The contact 1 of the female connector U1 is respectively connected to the 3.3V power supply network +3V3 and the first end of the resistor R1, and the second end of the resistor R1 is connected to the contact 4 of the female connector U1; the contact 2 of the female connector U1 is simultaneously connected to the pin 7 of the integrated circuit U2, the first end of the resistor R9 and the first end of the resistor R10; the contact 3 of the female connector U1 is simultaneously connected to the pin 8 of the integrated circuit U2, the first end of the resistor R8 and the first end of the resistor R11; the contacts 5 and 6 of the female connector U1 are simultaneously connected to the ground network GND; Pin 1 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D2, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; Pin 2 of the integrated circuit U2 is connected to the first end of the resistor R12; Pin 3 of the integrated circuit U2 is connected to the first end of the resistor R3; Pin 4 of the integrated circuit U2 is connected to the first end of the resistor R4; Pin 5 of the integrated circuit U2 is connected to the first end of the resistor R13; Pin 6 of the integrated circuit U2 is connected to contact 2 of the pin connector CN1; Pin 9 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; Pin 1 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; Pin 2 of the integrated circuit U2 is connected to the first end of the resistor R12; Pin 3 of the integrated circuit U2 is connected to the first end of the resistor R3; Pin 4 of the integrated circuit U2 is connected to the first end of the resistor R4; Pin 5 of the integrated circuit U2 is connected to the first end of the resistor R13; Pin 6 of the integrated circuit U2 is connected to contact 2 of the pin connector CN1; Pin 7 of the integrated circuit U2 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D2 is connected to the first end of the resistor R5; The positive electrode of D1 is connected to the first end of the resistor R2; the pin 10 of the integrated circuit U2 is connected to the contact 3 of the pin connector CN1; the pin 11 of the integrated circuit U2 is connected to the contact 1 of the pin connector CN1; the pin 12 of the integrated circuit U2 is connected to the contact 3 of the USB connector USB2; the pin 13 of the integrated circuit U2 is connected to the contact 2 of the USB connector USB2; the pin 15 of the integrated circuit U2 is connected to the 5V power supply network +5VA; the pin 16 of the integrated circuit U2 is simultaneously connected to the second end of the resistor R2, the second end of the resistor R5 and the first end of the capacitor C1; Pin 2 of the integrated circuit U3 is simultaneously connected to the positive electrode of the polarity capacitor C4, the first end of the capacitor C5 and connected to the 3.3V power supply network +3V3; Pin 3 of the integrated circuit U3 is connected to the first end of the resistor R7, and the second end of the resistor R7 is connected to the 5V power supply network +5VA; Pin 1 of the integrated circuit U3 is connected to the ground network GND; Contact 1 of the USB connector USB1 is connected to a 3.3V power supply network +3V3; Contact 2 of the USB connector USB1 is simultaneously connected to the second end of resistor R8 and the second end of resistor R10; Contact 3 of the USB connector USB1 is simultaneously connected to the second end of resistor R9 and the second end of resistor R11, and Contact 1 of the USB connector USB2 is connected to a 5V power supply network +5V; Contacts 4 and 5 of the USB connector USB1 are simultaneously connected to a ground network GND, and Contacts 4 and 5 of the USB connector USB2 are simultaneously connected to a ground network GND; The first end of the resettable fuse F1 is connected to the 5V power supply network +5V, and the second end of the resettable fuse F1 is simultaneously connected to the positive electrode of the polarity capacitor C2, the first end of the capacitor C3, the first end of the resistor R6 and connected to the 5V power supply network +5VA; the second end of the resistor R6 is connected to the positive electrode of the light-emitting diode D3; The contact 4 of the pin connector CN1 is connected to the ground network GND; the second end of the resistor R3, the second end of the resistor R4, the second end of the resistor R12 and the second end of the resistor R13 are simultaneously connected to the ground network GND, the negative electrode of the polarity capacitor C2, the negative electrode of the polarity capacitor C4, the second end of the capacitor C3 and the second end of the capacitor C5 are simultaneously connected to the ground network GND, and the negative electrode of the light-emitting diode D3 is connected to the ground network GND.

2. A serial interface to USB-HID protocol interface multiplexing circuit according to claim 1, characterized in that: The pin spacing of the female connector U1 is 2.0 mm.

3. A serial interface to USB-HID protocol interface multiplexing circuit according to claim 1, characterized in that: The capacitance of the capacitor C1 is 10uF, the capacitance of the capacitors C3 and C5 is 0.1uF, and the polar capacitors C2 and C4 are electrolytic capacitors with a capacitance of 10uF.

4. The serial interface to USB-HID protocol interface multiplexing circuit according to claim 1, characterized in that: The resistance values ​​of the resistors R1, R3, R4, R7, R8, R9, R10, R11, R12, and R13 are 0Ω, the resistance values ​​of the resistors R2 and R5 are 3.3KΩ, and the resistance value of the resistor R6 is 4.7KΩ.

5. The serial interface to USB-HID protocol interface multiplexing circuit according to claim 1, characterized in that: The light emitting diodes D1 and D2 are green light emitting diodes, and the light emitting diode D3 is a red light emitting diode.

6. A serial interface to USB-HID protocol interface multiplexing circuit according to claim 1, characterized in that: The maximum input voltage of the resettable fuse F1 is 13.2V, and the maximum allowable current is 500mA.

7. The serial interface to USB-HID protocol interface multiplexing circuit according to claim 1, characterized in that: The USB connectors USB1 and USB2 are type-A male connectors.

8. The serial interface to USB-HID protocol interface multiplexing circuit according to claim 1, characterized in that: The model of the pin connector CN1 is SH1.0-4P female socket.

Images