Small-size programmable timing signal generation board

Abstract

The utility model discloses a small-size programmable timing signal generation board, which comprises a pulse generation module and a differential sending module, and is characterized in that the pulse generation module generates a pulse signal of a TTL (Transistor-Transistor Logic) level by using an internal timer and sends the pulse signal to the differential sending module; and the differential sending module converts the pulse signal of the TTL level into a differential signal meeting the RS422 level to serve as a timing signal, and the timing signal is sent by using a differential output interface. According to the utility model, timing system signal output with different pulse widths and different periods can be realized, timing system output can be controlled through keys, and the timing system signal output circuit has the characteristics of simple circuit design, extremely low manufacturing cost, small size, convenience in carrying and operation, simplicity and practicability.

Description

Technical Field

[0001] This utility model belongs to the field of communication control technology for industrial equipment, and in particular to a small-sized programmable timing signal generator board. Background Technology

[0002] Timing signals, serving as a synchronization reference for information communication between devices, are widely used in communication systems of various electrical components in industrial control. Timing signal generators provide a unified time reference for all device systems; therefore, they are crucial for enabling devices on the bus to work collaboratively and avoiding data transmission conflicts.

[0003] Currently, timing devices all employ powerful, dedicated timing boards. These boards can modify the control program according to customer needs, receiving or generating timing signals of different frequencies and duty cycles to meet the timing signal requirements of different systems. However, existing timing devices suffer from drawbacks such as large size, high cost, and inconvenience in portability. Especially when individual devices require separate external timing input signals for debugging and verification, equipping each device with a separate timing device is not only expensive but also difficult to carry. Summary of the Invention

[0004] The purpose of this invention is to provide a small-sized programmable timing signal generator board, which can further reduce the cost and size of the timing signal generator and facilitate the individual debugging of various communication devices.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A small-volume programmable timing signal generator board includes a pulse generation module and a differential transmission module, wherein:

[0007] The pulse generation module uses an internal timer to generate TTL level pulse signals and sends them to the differential transmission module; the differential transmission module converts the TTL level pulse signals into differential signals that meet RS422 level requirements as timing signals, and transmits them using the differential output interface.

[0008] Furthermore, the generator board also includes a power module; the power module includes a power interface, a power conversion circuit, and a power indicator circuit, wherein the power interface is used to provide an external power supply of 4.5V to 5.5V; the power conversion circuit converts the external power supply into a 3.3V power supply to provide to the pulse generator module and the differential transmission module; and the power indicator circuit is used to indicate the operating status of the power module.

[0009] Furthermore, the pulse generation module includes a microcontroller chip U1, resistors R2, R4, and R5; capacitors C1 and C2; and a light-emitting diode D1. The chip U1 is model STC15W104-35I-SOP8, wherein:

[0010] Pin 1 of chip U1 is connected to one end of resistor R2; pin 2 of chip U1 is connected to the power conversion circuit of the power module; pin 4 of chip U1 is connected to power ground; pin 5 of chip U1 is connected to one end of resistor R5; pin 6 of chip U1 is connected to one end of resistor R4; the other end of resistor R2 is connected to the negative terminal of LED D1; the other end of resistor R4 is connected to the programming interface; the other end of resistor R5 is connected to the programming interface; the positive terminal of LED D1 is connected to pin 2 of chip U1; one end of capacitor C1 is connected to pin 2 of chip U1, and the other end is connected to pin 4 of chip U1; one end of capacitor C2 is connected to pin 2 of chip U1, and the other end is connected to pin 4 of chip U1; D1 serves as a status indicator light, flashing when there is a system signal output and turning off when there is no output.

[0011] Furthermore, an output switch circuit is also connected to the pulse generation module; the output switch circuit includes a button S1, a resistor R1, and a capacitor C7, wherein one end of the button S1 is connected to the power conversion circuit, and the other end is connected to one end of the capacitor C7 and the resistor R1, and is also connected to pin 3 of the chip U1; the other end of the resistor R1 is connected to the power conversion circuit, and the other end of the capacitor C7 is connected to the power ground; C7 is a debouncing capacitor.

[0012] Furthermore, button S1 is a time synchronization output switch. When a time synchronization signal is being output, pressing the button once will stop the output of the time synchronization signal; when no time synchronization signal is being output, pressing the button once will start the output of the time synchronization signal.

[0013] Furthermore, the microcontroller is connected to a programming interface; the programming interface is used for serial programming to change the timing signal period and pulse width;

[0014] The programming interface is a microcontroller serial port, including a three-pin connector; pins 5 and 6 of U1 are connected to the RX and TX terminals of the three-pin connector via resistors R4 and R5, respectively, and the other port of the three-pin connector is the ground terminal.

[0015] Further, the differential transmission module includes an RS422 transceiver chip U3, TVS devices D4 and D5; resistors R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, and R17; and a capacitor C8, wherein:

[0016] The TVS devices D4 and D5 are model PESD1CAN, and chip U3 is model SIT3490. Pin 1 of chip U3 is connected to the 3.3V power output pin VCC3V3 of the power conversion circuit; pin 2 of chip U3 is connected to one end of resistor R10; pin 3 of chip U3 is connected to one end of resistor R13; the other end of resistor R10 is connected to pin 7 of chip U1; the other end of resistor R13 is connected to one end of resistor R16 and also to resistor R4; the other end of resistor R16 is connected to pin 1 of chip U3; pin 4 of chip U3 is connected to power ground; pin 5 of chip U3 is connected to one end of resistor R17 and also to one end of resistor R15. Pin 6 is connected to one end of resistor R14 and the other end of resistor R15. Pin 7 of chip U3 is connected to one end of resistor R11. Pin 8 of chip U3 is connected to one end of resistor R7. The other end of resistor R7 is connected to one end of resistor R8 and one end of resistor R9. The other end of resistor R11 is connected to one end of resistor R12 and the other end of resistor R9. Pin 1 of TVS device D4 is connected to pin 5 of chip U3. Pin 2 is connected to pin 6 of chip U3. Pin 3 is connected to pin 4 of chip U3. Pin 1 of TVS device D5 is connected to one end of resistor R12. Pin 2 is connected to one end of resistor R8. Pin 3 is connected to pin 4 of chip U3.

[0017] Furthermore, the power conversion circuit in the power module includes an LDO chip; the power interface adopts a MicroMSB female connector or a Type-C female connector.

[0018] Compared with the prior art, this utility model has the following technical features:

[0019] This invention can output timing signals with different pulse widths and periods through a programming interface, and the timing output can be controlled by buttons. It features simple circuit design, extremely low manufacturing cost, very small size, easy portability, convenient operation, and simple practicality. Attached Figure Description

[0020] Figure 1 This is the circuit block diagram of this utility model;

[0021] Figure 2 This is a circuit diagram of the pulse generation module, output switch circuit, and programming interface of this utility model;

[0022] Figure 3 This is the differential transmission module circuit of this utility model;

[0023] Figure 4 This is the power module circuit of this utility model;

[0024] Figure 5 These are physical images of embodiments of this utility model;

[0025] Figure 6 This is a waveform diagram of the output timing signal test in an embodiment of this utility model. Detailed Implementation

[0026] Referring to the accompanying drawings, this utility model provides a small-volume programmable timing signal generator board, including a pulse generation module and a differential transmission module, wherein:

[0027] The pulse generation module uses an internal timer to generate TTL level pulse signals and sends them to the differential transmission module; the differential transmission module converts the TTL level pulse signals into differential signals that meet RS422 level requirements as timing signals, and transmits them using the differential output interface.

[0028] like Figure 1 As shown, the generator board also includes a power module; the power module includes a power interface, a power conversion circuit, and a power indicator circuit, wherein the power interface is used to provide an external power supply of 4.5V to 5.5V; the power conversion circuit converts the external power supply into a 3.3V power supply to provide to the pulse generator module and the differential transmission module; and the power indicator circuit is used to indicate the working status of the power module.

[0029] 1. Pulse Generator Module

[0030] like Figure 2 As shown, the pulse generation module includes a microcontroller chip U1, resistors R2, R4, and R5; capacitors C1 and C2; and a light-emitting diode D1. Chip U1 is model STC15W104-35I-SOP8. Pin 1 of chip U1 is connected to one end of resistor R2; pin 2 of chip U1 is connected to the 3.3V power output pin VCC3V3 of the power conversion circuit of the power module; pin 4 of chip U1 is connected to ground; pin 5 of chip U1 is connected to one end of resistor R5; and pin 6 of chip U1 is connected to… One end of resistor R4 is connected to the programming interface; the other end of resistor R2 is connected to the negative terminal of LED D1; the other end of resistor R4 is connected to the programming interface; the other end of resistor R5 is connected to the programming interface; the positive terminal of LED D1 is connected to pin 2 of chip U1; one end of capacitor C1 is connected to pin 2 of chip U1, and the other end is connected to pin 4 of chip U1; one end of capacitor C2 is connected to pin 2 of chip U1, and the other end is connected to pin 4 of chip U1; D1 is a status indicator light, which flashes when there is a system signal output and turns off when there is no output.

[0031] Among them, the model of chip U1 can also be STC15F104W-35I-SOP8, or STC15L104W-35I-SOP8, or other microcontrollers that can be replaced in situ with these models of microcontrollers.

[0032] The pulse generation module is also connected to an output switch circuit and a programming interface; the programming interface is used for serial programming to change the timing signal period and pulse width.

[0033] The output switch circuit includes a button S1, a resistor R1, and a capacitor C7. One end of button S1 is connected to the 3.3V power output pin VCC3V3 of the power conversion circuit, and the other end is connected to one end of capacitor C7 and resistor R1, as well as pin 3 of chip U1. The other end of resistor R1 is connected to the 3.3V power output pin VCC3V3 of the power conversion circuit, and the other end of capacitor C7 is connected to ground. To prevent button jitter and bounce and improve the reliability of detection, C7 is a debouncing capacitor. S1 is a time synchronization output switch. When a time synchronization signal is output, pressing the button once stops the output of the time synchronization signal; when no time synchronization signal is output, pressing the button once starts the output of the time synchronization signal.

[0034] The programming interface is a microcontroller serial port, including a three-pin connector; see appendix. Figure 2 The leads are respectively introduced from pins 5 and 6 of U1 through resistors R4 and R5 to the RX and TX terminals of the three-pin connector. The other terminal of the three-pin connector is the ground terminal.

[0035] 2. Differential Transmission Module

[0036] The differential transmission module includes an RS422 transceiver chip U3, TVS devices D4 and D5; resistors R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, and R17; and a capacitor C8, wherein:

[0037] The TVS devices D4 and D5 are model PESD1CAN, with a maximum reverse standby voltage of 12V to 24V and ESD protection of not less than 15KV; chip U3 is model SIT3490; pin 1 of chip U3 is connected to the 3.3V power output pin VCC3V3 of the power conversion circuit; pin 2 of chip U3 is connected to one end of resistor R10; pin 3 of chip U3 is connected to one end of resistor R13; the other end of resistor R10 is connected to pin 7 of chip U1; the other end of resistor R13 is connected to one end of resistor R16 and also to resistor R4; the other end of resistor R16 is connected to pin 1 of chip U3; pin 4 of chip U3 is connected to power ground; pin 5 of chip U3 is connected to one end of resistor R17 and also to... One end of resistor R15 is connected; pin 6 of chip U3 is connected to one end of resistor R14 and the other end of resistor R15; pin 7 of chip U3 is connected to one end of resistor R11; pin 8 of chip U3 is connected to one end of resistor R7; the other end of resistor R7 is connected to one end of resistor R8 and one end of resistor R9; the other end of resistor R11 is connected to one end of resistor R12 and the other end of resistor R9; pin 1 of TVS device D4 is connected to pin 5 of chip U3; pin 2 is connected to pin 6 of chip U3; pin 3 is connected to pin 4 of chip U3; pin 1 of TVS device D5 is connected to one end of resistor R12; pin 2 is connected to one end of resistor R8; pin 3 is connected to pin 4 of chip U3. The timing signal is finally output through the differential output interface formed by pins 5 and 6 of chip U3; the transmission rate of chip U3 is not less than 2Mbps. The output timing signal meets the RS422 differential level standard. Its output signal type is a pulse signal. The pulse width and period can be changed by programming. The minimum pulse width is no more than 10μs. When there is no output load, the maximum edge rise and fall time is no more than 0.5μs.

[0038] 3. Power Module

[0039] The power module includes a linear low-voltage regulator chip U2, resistor R3, capacitors C3, C4, C5, C6, and C23; diodes D3 and D2; and a MicroMSB female connector MSB1; the chip U2 is model AMS1117-3.3, the diode D3 is model 1N5819, and the diode D2 is a light-emitting diode.

[0040] In this circuit, pin 1 of chip U2 is connected to capacitors C3, C4, C5, C6, C23, and the negative terminal of diode D2, serving as the power ground signal for the timing board. Pins 2 and 4 of chip U2 are connected to the other ends of capacitors C4 and C5, and also to one end of resistor R3, forming a power conversion circuit that provides a 3.3V power output pin VCC3V3. The other end of resistor R3 is connected to the positive terminal of diode D2, and pin 3 of chip U2 is connected to the other ends of capacitors C3 and C6, and also to the negative terminal of diode D3. Diode D2 serves as a power indicator circuit.

[0041] Pin 1 of the MicroMSB female connector MSB1 is connected to the positive terminal of diode D3, pin 5 is connected to pin 1 of chip U2, and is also connected to one end of capacitor C23. The other end of capacitor C23 is connected to pins 6, 7, 8, and 9 of the MicroMSB female connector MSB1, forming a power interface. The power interface can also be any other type of MicroMSB female connector or any type of Type-C female connector, and can be powered by a general mobile phone charger.

[0042] A physical diagram of an embodiment of this utility model is shown below. Figure 5 As shown, its dimensions are 2.2 × 5 × 3 cm. The output timing signal waveform was tested using an oscilloscope, as shown below. Figure 6 As shown, its pulse width is 10 μs, and both the rise time and fall time are less than 0.5 μs.

[0043] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A small-volume programmable timing signal generator board, characterized in that, It includes a pulse generation module and a differential transmission module, wherein: The pulse generation module uses an internal timer to generate TTL level pulse signals and sends them to the differential transmission module; the differential transmission module converts the TTL level pulse signals into differential signals that meet RS422 level requirements as timing signals, and transmits them using the differential output interface; The pulse generation module includes a microcontroller chip U1, resistors R2, R4, and R5; capacitors C1 and C2; and a light-emitting diode D1. The chip U1 is model STC15W104-35I-SOP8, wherein: Pin 1 of chip U1 is connected to one end of resistor R2; pin 2 of chip U1 is connected to the power conversion circuit of the power module; pin 4 of chip U1 is connected to power ground; pin 5 of chip U1 is connected to one end of resistor R5; pin 6 of chip U1 is connected to one end of resistor R4; the other end of resistor R2 is connected to the negative terminal of LED D1; the other end of resistor R4 is connected to the programming interface; the other end of resistor R5 is connected to the programming interface; the positive terminal of LED D1 is connected to pin 2 of chip U1; one end of capacitor C1 is connected to pin 2 of chip U1, and the other end is connected to pin 4 of chip U1; one end of capacitor C2 is connected to pin 2 of chip U1, and the other end is connected to pin 4 of chip U1; D1 serves as a status indicator light, flashing when there is a system signal output and turning off when there is no output.

2. The small-volume programmable timing signal generator board according to claim 1, characterized in that, The generator board also includes a power module; the power module includes a power interface, a power conversion circuit and a power indicator circuit, wherein the power interface is used to provide an external power supply of 4.5V~5.5V; the power conversion circuit converts the external power supply into a 3.3V power supply to provide to the pulse generator module and the differential transmission module; The power indicator circuit is used to indicate the operating status of the power module.

3. The small-volume programmable timing signal generator board according to claim 1, characterized in that, An output switch circuit is also connected to the pulse generation module; the output switch circuit includes a button S1, a resistor R1, and a capacitor C7. One end of the button S1 is connected to the power conversion circuit, and the other end is connected to one end of the capacitor C7 and the resistor R1, and is also connected to pin 3 of the chip U1. The other end of the resistor R1 is connected to the power conversion circuit, and the other end of the capacitor C7 is connected to the power ground; C7 is a debouncing capacitor.

4. The small-volume programmable timing signal generator board according to claim 3, characterized in that, Button S1 is the time signal output switch. When a time signal is being output, pressing the button once will stop the time signal output; when no time signal is being output, pressing the button once will start the time signal output.

5. The small-volume programmable timing signal generator board according to claim 1, characterized in that, The microcontroller chip U1 is connected to a programming interface; The programming interface is used for serial port programming to change the timing signal period and pulse width; The programming interface is a microcontroller serial port, including a three-pin connector; pins 5 and 6 of U1 are connected to the RX and TX terminals of the three-pin connector via resistors R4 and R5, respectively, and the other port of the three-pin connector is the ground terminal.

6. The small-volume programmable timing signal generator board according to claim 1, characterized in that, The differential transmission module includes an RS422 transceiver chip U3, TVS devices D4 and D5; resistors R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, and R17; and a capacitor C8, wherein: The TVS devices D4 and D5 are model PESD1CAN, and chip U3 is model SIT3490. Pin 1 of chip U3 is connected to the 3.3V power output pin VCC3V3 of the power conversion circuit; pin 2 of chip U3 is connected to one end of resistor R10; pin 3 of chip U3 is connected to one end of resistor R13; the other end of resistor R10 is connected to pin 7 of chip U1; the other end of resistor R13 is connected to one end of resistor R16 and also to resistor R4; the other end of resistor R16 is connected to pin 1 of chip U3; pin 4 of chip U3 is connected to power ground; pin 5 of chip U3 is connected to one end of resistor R17 and also to one end of resistor R15. Pin 6 is connected to one end of resistor R14 and the other end of resistor R15. Pin 7 of chip U3 is connected to one end of resistor R11. Pin 8 of chip U3 is connected to one end of resistor R7. The other end of resistor R7 is connected to one end of resistor R8 and one end of resistor R9. The other end of resistor R11 is connected to one end of resistor R12 and the other end of resistor R9. Pin 1 of TVS device D4 is connected to pin 5 of chip U3. Pin 2 is connected to pin 6 of chip U3. Pin 3 is connected to pin 4 of chip U3. Pin 1 of TVS device D5 is connected to one end of resistor R12. Pin 2 is connected to one end of resistor R8. Pin 3 is connected to pin 4 of chip U3.

7. The small-volume programmable timing signal generator board according to claim 2, characterized in that, The power conversion circuit in the power module includes an LDO chip; the power interface uses a MicroMSB female connector or a Type-C female connector.

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