LIN bus analyzer

Abstract

The utility model relates to an LIN (Local Interconnect Network) bus analyzer which comprises a main control module, the main control module is connected with a voltage conversion module, a first voltage stabilization module, a second voltage stabilization module, a program downloading module, an electrostatic absorption module, an IO (Input / Output) isolation module and an LIN transceiving module, the first voltage stabilization module is used for providing 3.3 V power for the main control module, and the second voltage stabilization module is used for providing 3.3 V power for the main control module; the second voltage stabilizing module is used for providing a 5V power supply for the main control module, the program downloading module is used for enabling the main control module to be connected with external control equipment for program interaction, the static absorption module is used for absorbing static electricity, the voltage conversion module is used for converting voltage, the IO isolation module is used for isolating a 3.3 V power supply and a 5V power supply, and the LIN receiving and transmitting module is used for connecting external data. According to the LIN bus analyzer, the input voltage is more stable through the first voltage stabilization module and the second voltage stabilization module, static electricity is eliminated through the static electricity absorption module, it is guaranteed that current is not interfered by the static electricity, and therefore the safety and reliability of the LIN bus analyzer are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to LIN bus technical field more specifically, it relates to a LIN bus analyzer. BACKGROUND

[0002] LIN (Local Interconnect Network) bus is a kind of low-cost serial communication network for internal communication of automobile, mainly used to connect intelligent sensor and actuator.LIN bus analyzer is a tool specially used to monitor, record, analyze data flow on LIN bus, it helps engineer to diagnose problem, verify design and optimize system performance.The LIN bus analyzer of prior art has the problems of instability and easy failure. SUMMARY

[0003] In view of the deficiencies of prior art, the utility model provides a LIN bus analyzer, which makes input voltage more stable through first voltage stabilizing module and second voltage stabilizing module, and eliminates static electricity through static electricity absorbing module, to ensure that current is not disturbed by static electricity, thereby improving the safety and reliability of LIN bus analyzer.

[0004] The utility model provides a LIN bus analyzer, technical scheme is as follows:

[0005] A kind of LIN bus analyzer, it includes main control module, main control module is connected with voltage conversion module, first voltage stabilizing module, second voltage stabilizing module, program download module, static electricity absorbing module, IO isolation module and LIN transceiver module, first voltage stabilizing module is used to provide 3.3V power supply for main control module, second voltage stabilizing module is used to provide 5V power supply for main control module, program download module is used to supply main control module to connect external control device and carry out program interaction, static electricity absorbing module is used to absorb static electricity, voltage conversion module is used to convert voltage, IO isolation module is used to isolate 3.3V power supply and 5V power supply, LIN transceiver module is used to connect external data.

[0006] As described above, the above technical scheme has the following beneficial effects: the LIN bus analyzer of the application makes input voltage more stable through first voltage stabilizing module and second voltage stabilizing module, and eliminates static electricity through static electricity absorbing module, to ensure that current is not disturbed by static electricity, thereby improving the safety and reliability of LIN bus analyzer. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 It is a kind of module connection schematic diagram of LIN bus analyzer;

[0008] Figure 2 It is main control module schematic diagram of a kind of LIN bus analyzer;

[0009] Figure 3 A schematic diagram of a voltage conversion module of a LIN bus analyzer;

[0010] Figure 4 A schematic diagram of a first voltage stabilizing module of a LIN bus analyzer;

[0011] Figure 5 A schematic diagram of a second voltage stabilizing module of a LIN bus analyzer;

[0012] Figure 6 A schematic diagram of a program downloading module of a LIN bus analyzer;

[0013] Figure 7 A schematic diagram of an electrostatic absorption module of a LIN bus analyzer;

[0014] Figure 8 A schematic diagram of an IO isolation module of a LIN bus analyzer;

[0015] Figure 9 A schematic diagram of a LIN transceiver module of a LIN bus analyzer.

[0016] Reference signs: 10, master control module; 20, voltage conversion module; 30, first voltage stabilizing module; 40, second voltage stabilizing module; 50, program downloading module; 60, electrostatic absorption module; 70, IO isolation module; 80, LIN transceiver module. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0018] As Figures 1-9As shown, a LIN bus analyzer includes a master module 10, the master module 10 is connected with a voltage conversion module 20, a first voltage stabilizing module 30, a second voltage stabilizing module 40, a program downloading module 50, an electrostatic absorption module 60, an IO isolation module 70 and a LIN transceiver module 80, the first voltage stabilizing module 30 is used to provide 3.3V power supply for the master module 10, the second voltage stabilizing module 40 is used to provide 5V power supply for the master module 10, the program downloading module 50 is used to connect external control equipment for program interaction for the master module 10, the electrostatic absorption module 60 is used to absorb static electricity, the voltage conversion module 20 is used to convert voltage, the IO isolation module 70 is used to isolate 3.3V power supply and 5V power supply, and the LIN transceiver module 80 is used to connect external data. The LIN bus analyzer of the application makes the input voltage more stable through the first voltage stabilizing module 30 and the second voltage stabilizing module 40, and eliminates static electricity through the electrostatic absorption module 60, so as to ensure that the current is not disturbed by static electricity, thereby improving the safety and reliability of the LIN bus analyzer.

[0019] The master module 10 includes a master chip U1, the twenty-second pin of the master chip U1 is connected to one end of a resistor R1, the twenty-fifth pin is connected to one end of a resistor R2, the other end of the resistor R1 is connected to the positive electrode of an LED lamp D1, the other end of the resistor R2 is connected to the positive electrode of an LED lamp D2, and the negative electrode of the LED lamp D1 and the negative electrode of the LED lamp D2 are commonly grounded; the fifth pin of the master chip U1 is connected to a crystal oscillator Y1 and one end of a capacitor C2 respectively, and the sixth pin is connected to the other end of the crystal oscillator Y1 and one end of a capacitor C1 respectively, and the other ends of the capacitor C1 and the capacitor C2 are commonly grounded.

[0020] The model of the master chip U1 is STM32F103C, and of course other chips with the same function can also be used. The eighth pin, the twenty-third pin, the thirty-fifth pin, the forty-fourth pin and the forty-seventh pin of the master chip U1 are grounded. The LIN (Local Interconnect Network) bus analyzer is a tool for monitoring and analyzing LIN bus data transmission, which optimizes the communication protocol of the LIN bus by analyzing the accuracy and efficiency of the transmission content such as information header, data byte and check area, to ensure that the data can be accurately and quickly transmitted between different control units, sensors and execution elements

[0021] The voltage conversion module 20 includes a direct current converter P1, the first pin of the direct current converter P1 is connected to the ground and one end of a capacitor C3 respectively; the second pin is connected to the other end of the capacitor C3 and provides 5V power supply; the third pin is connected to the ground and the first end of a capacitor C4 respectively; the fourth pin is connected to the other end of the capacitor C4 and provides 12V power supply. The model of the direct current converter P1 is BS0512, and of course other chips with the same function can also be used.

[0022] The first voltage stabilizing module 30 comprises a voltage stabilizing chip IC1, the first pin of which is connected to a 5V power supply as an input, the second pin is grounded, the third pin is connected to a 5V power supply and one end of a capacitor C5, the fifth pin is connected to the first pin, the ninth pin, the twenty-fourth pin, the thirty-sixth pin and the forty-eighth pin of the main control chip U1 for providing a 3.3V power supply, and the other end of the capacitor C5 is grounded. The model of the voltage stabilizing chip IC1 is SPX3819M5-3.3, and of course other chips with the same function can also be used. The fourth pin of the voltage stabilizing chip IC1 is not connected.

[0023] The second voltage stabilizing module 40 comprises a voltage stabilizing chip IC2, the first pin of which is connected to one end of a capacitor C8 and the fourth pin of a DC converter P1 for inputting a 12V power supply, the second pin is grounded, the third pin is connected to the fourth pin of the DC converter P1 for connecting a 12V power supply, the fifth pin is connected to one end of a resistor R9 and one end of a capacitor C9 for outputting a 5V power supply, and the other ends of the capacitor C8, the resistor R9 and the capacitor C9 are grounded. The model of the voltage stabilizing chip IC2 is TP22.2-5.0, and of course other chips with the same function can also be used.

[0024] The program downloading module 50 comprises an external interface P2, the first pin of which is connected to the thirty-fourth pin of the main control chip U1 and one end of a resistor R3, the second pin is connected to the thirty-seventh pin of the main control chip U1 and one end of a resistor R5, the third pin is grounded, the fourth pin is connected to the fifth pin of the voltage stabilizing chip IC1 for connecting a 3.3V power supply, the fifth pin is connected to the seventh pin of the main control chip U1, one end of the resistor R4 and one end of a capacitor C6, the other ends of the resistor R3 and the resistor R4 are connected to the fifth pin of the voltage stabilizing chip IC1 for connecting a 3.3V power supply, and the other ends of the resistor R5 and the capacitor C6 are grounded. The program downloading module 50 is used for writing programs to the main control module 10.

[0025] The static electricity absorption module 60 comprises a static electricity discharge protector TVS1, the first pin of the static electricity discharge protector TVS1 is grounded; the second pin is connected to the thirty-third pin of the main control chip U1 and one end of the resistor R6 respectively, the other end of the resistor R6 is used for providing 3.3V power supply; the third pin is connected to the thirty-second pin of the main control chip U1 and the third pin of the external interface P3 respectively; the fourth pin is connected to 5V power supply and the first pin of the external interface P3 respectively, the other end of the resistor R6 is connected to the fifth pin of the voltage stabilizing chip IC1; the second pin of the external interface P3 is connected to the thirty-third pin of the main control chip U1, and the fourth pin is grounded. The model of the static electricity discharge protector is ESD05V14T, of course, other chips with the same function can also be used. After the external interface P3 is connected to the external power supply, the static electricity of the LIN bus analyzer can be taken out.

[0026] The IO isolation module 70 comprises a load point controller U2, the first pin of the load point controller U2 is connected to the fifth pin of the voltage stabilizing chip IC1, and is used for connecting 3.3V power supply; the second pin is connected to the twelfth pin of the main control chip U1; the third pin is connected to the thirteenth pin of the main control chip U1 and one end of the resistor R10 respectively; the fourth pin and the fifth pin are grounded respectively; the sixth pin and the seventh pin are used for being connected to the LIN transceiver module 80; the eighth pin is used for being connected to the fifth pin of the voltage stabilizing chip IC2, and is used for connecting 5V power supply; the other end of the resistor R10 is connected to the positive electrode of the LED lamp D3, and the negative electrode of the LED lamp D3 is grounded. The model of the load point controller U2 is PI121, of course, other chips with the same function can also be used.

[0027] The LIN transceiver module 80 comprises a transceiver chip U3, the first pin of the transceiver chip U3 is connected to the sixth pin of the load point controller U2 and one end of the resistor R7 respectively; the second pin is connected to the fifth pin of the voltage stabilizing chip IC2, and is used for connecting 5V power supply; the fourth pin is connected to the seventh pin of the load point controller U2; the fifth pin is connected to the ground and one end of the capacitor C7 respectively; the sixth pin is connected to the other end of the capacitor C7 and the third pin of the photoelectric coupler J1 respectively; the seventh pin is connected to the first pin of the voltage stabilizing chip IC2 and the positive electrode of the diode D1 respectively; the other end of the resistor R7 is connected to the fifth pin of the voltage stabilizing chip IC2, and is used for connecting 5V power supply; the negative electrode of the diode D1 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the fourth pin of the photoelectric coupler J1, the first pin of the photoelectric coupler is connected to the twenty-ninth pin of the main control chip U1, and the second pin of the photoelectric coupler is grounded. The model of the transceiver chip is TJA1021, the model of the photoelectric coupler is TLP281, of course, other chips with the same function can also be used.

[0028] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical scheme falling within the concept of the present application belongs to the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application are also considered to be within the protection scope of the present application.

Claims

1. A LIN bus analyzer, characterized in that, The utility model provides a kind of LIN bus module, including main control module (10), the voltage conversion module (20) is connected with the first voltage stabilizing module (30), the second voltage stabilizing module (40), program download module (50), static electricity absorption module (60), IO isolation module (70) and LIN transceiver module (80) are connected to the main control module (10), the first voltage stabilizing module (30) is used to provide 3.3V power supply for main control module (10), the second voltage stabilizing module (40) is used to provide 5V power supply for main control module (10), program download module (50) is used to connect external control device for program interaction for main control module (10), static electricity absorption module (60) is used to absorb static electricity, voltage conversion module (20) is used to convert voltage, IO isolation module (70) is used to isolate 3.3V power supply and 5V power supply, and LIN transceiver module (80) is used to connect external data.

2. The LIN bus analyzer according to claim 1, characterized in that, The main control module (10) includes a main control chip U1, the second twenty-two pin of the main control chip U1 is connected to one end of the resistor R1, the twenty-fifth pin is connected to one end of the resistor R2, the other end of the resistor R1 is connected to the positive electrode of the LED lamp D1, the other end of the resistor R2 is connected to the positive electrode of the LED lamp D2, and the negative electrode of the LED lamp D1 and the negative electrode of the LED lamp D2 are commonly grounded. The fifth pin of the main control chip U1 is connected to the crystal oscillator Y1 and one end of the capacitor C2 respectively, the sixth pin is connected to the other end of the crystal oscillator Y1 and one end of the capacitor C1 respectively, and the other ends of the capacitor C1 and the capacitor C2 are commonly grounded.

3. The LIN bus analyzer according to claim 2, characterized in that, The voltage conversion module (20) includes a DC converter P1, the first pin of the DC converter P1 is connected to the ground and one end of the capacitor C3 respectively; The second pin is connected to the other end of the capacitor C3, and 5V power supply is provided; The third pin is connected to the ground and the first end of the capacitor C4 respectively; The fourth pin is connected to the other end of the capacitor C4, and 12V power supply is provided.

4. The LIN bus analyzer according to claim 3, characterized in that, The first voltage stabilizing module (30) includes a voltage stabilizing chip IC1, the first pin of the voltage stabilizing chip IC1 and the 5V power supply are used as input; The second pin is grounded; The third pin is connected to the 5V power supply and one end of the capacitor C5; The fifth pin is connected to the first pin, the ninth pin, the twenty-fourth pin, the thirty-sixth pin and the forty-eighth pin of the main control chip U1 for providing 3.3V power supply, and the other end of the capacitor C5 is grounded.

5. The LIN bus analyzer according to claim 4, characterized in that, The second voltage stabilizing module (40) includes a voltage stabilizing chip IC2, the first pin of the voltage stabilizing chip IC2 is connected to one end of the capacitor C8 and the fourth pin of the DC converter P1 respectively, for inputting 12V power supply; The second pin is grounded; The third pin is connected to the fourth pin of the DC converter P1 for connecting 12V power supply; The fifth pin is connected to one end of the resistor R9 and one end of the capacitor C9 respectively for outputting 5V power supply; The other ends of the capacitor C8, the resistor R9 and the capacitor C9 are grounded respectively.

6. The LIN bus analyzer according to claim 5, characterized in that The program download module (50) includes an external interface P2, the first pin of the external interface P2 is connected to the thirty-fourth pin of the main control chip U1 and one end of the resistor R3 respectively; The second pin is connected to the thirty-seventh pin of the main control chip U1 and one end of the resistor R5 respectively; The third pin is grounded; The fourth pin is connected to the fifth pin of the voltage stabilizing chip IC1 for connecting 3.3V power supply; The fifth pin is connected to the seventh pin of the main control chip U1, one end of the resistor R4 and one end of the capacitor C6 respectively; The other ends of the resistor R3 and the resistor R4 are connected to the fifth pin of the voltage stabilizing chip IC1 for connecting 3.3V power supply respectively; The other ends of the resistor R5 and the capacitor C6 are grounded together.

7. The LIN bus analyzer according to claim 6, characterized in that, The electrostatic absorption module (60) comprises an electrostatic discharge protector TVS1, and a first pin of the electrostatic discharge protector TVS1 is grounded; The second pin is connected to the thirty-third pin of the main control chip U1 and one end of the resistor R6 respectively, and the other end of the resistor R6 is used for providing 3.3V power supply; The third pin is connected to the thirty-second pin of the main control chip U1 and the third pin of the external interface P3 respectively; The fourth pin is connected to 5V power supply and the first pin of the external interface P3 respectively, and the other end of the resistor R6 is connected to the fifth pin of the voltage stabilizing chip IC1; The second pin of the external interface P3 is connected to the thirty-third pin of the main control chip U1, and the fourth pin is grounded.

8. The LIN bus analyzer according to claim 7, characterized in that, The IO isolation module (70) comprises a load point controller U2, and a first pin of the load point controller U2 is connected to the fifth pin of the voltage stabilizing chip IC1 for connecting 3.3V power supply; The second pin is connected to the twelfth pin of the main control chip U1; The third pin is connected to the thirteenth pin of the main control chip U1 and one end of the resistor R10 respectively; The fourth pin and the fifth pin are grounded respectively; The sixth pin and the seventh pin are used for being connected to the LIN transceiver module (80); The eighth pin is used for being connected to the fifth pin of the voltage stabilizing chip IC2 for connecting 5V power supply; The other end of the resistor R10 is connected to the positive electrode of the LED lamp D3, and the negative electrode of the LED lamp D3 is grounded.

9. The LIN bus analyzer according to claim 8, characterized in that, The LIN transceiver module (80) comprises a transceiver chip U3, and a first pin of the transceiver chip U3 is connected to the sixth pin of the load point controller U2 and one end of the resistor R7 respectively; The second pin is connected to the fifth pin of the voltage stabilizing chip IC2 for connecting 5V power supply; The fourth pin is connected to the seventh pin of the load point controller U2; The fifth pin is connected to the ground and one end of the capacitor C7 respectively; The sixth pin is connected to the other end of the capacitor C7 and the third pin of the photoelectric coupler J1 respectively; The seventh pin is connected to the first pin of the voltage stabilizing chip IC2 and the positive electrode of the diode D1 respectively; The other end of the resistor R7 is connected to the fifth pin of the voltage stabilizing chip IC2 for connecting 5V power supply; The negative electrode of the diode D1 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the fourth pin of the photoelectric coupler J1, the first pin of the photoelectric coupler is connected to the twenty-ninth pin of the main control chip U1, and the second pin of the photoelectric coupler is grounded.

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