Communication protocol conversion stamp and intelligent device

Abstract

The utility model relates to circuit technical field especially relates to a communication protocol conversion printing plate and intelligent equipment. A communication protocol conversion printing plate, include: microcontroller, microcontroller's VBAT pin connects a power management circuit, JTAG connector, microcontroller's USART0_TX pin and USART0_RX pin are connected microcontroller's JTMS pin, JTCK pin, JTDI pin, JTDO pin, nJTRST pin through JTAG connector, CAN transceiver, microcontroller's CAN0_RX pin and CAN0_TX pin are connected CAN connector through CAN transceiver, elevator direct transmission signal connector, microcontroller's USART2_RX pin and USART2_TX pin connect elevator direct transmission signal connector. Provide a kind of optimized communication protocol conversion printing plate, reduce signal interference, improve communication rate and stability.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and in particular to a communication protocol conversion circuit board. Background Technology

[0002] With the rapid development of the Internet of Things (IoT) and smart devices, the performance requirements for communication integrated circuits are increasing. Existing communication integrated circuits have some design shortcomings, such as high signal interference, high power consumption, and limited communication speed. In complex electromagnetic environments, the stability of communication and data integrity face challenges. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a communication protocol conversion board.

[0004] The purpose of this invention is also to provide an intelligent device.

[0005] A communication protocol conversion board, comprising:

[0006] A microcontroller, wherein the VBAT pin of the microcontroller is connected to a power management circuit;

[0007] The microcontroller's USART0_TX and USART0_RX pins are connected to the microcontroller's JTMS, JTCK, JTDI, JTDO, and nJTRST pins via the JTAG connector.

[0008] A CAN transceiver is provided, wherein the CAN0_RX pin and CAN0_TX pin of the microcontroller are connected to the CAN connector via the CAN transceiver.

[0009] An elevator direct-transmission signal connector is provided, wherein the USART2_RX pin and USART2_TX pin of the microcontroller are connected to the elevator direct-transmission signal connector.

[0010] The communication protocol conversion board of this utility model has the CANH pin of the CAN transceiver connected to the third pin of the CAN connector, the CANL pin of the CAN transceiver connected to the second pin of the CAN connector, and the SPLIT pin of the CAN transceiver connected to the CANH pin through a first resistor and a second resistor connected in parallel with the first resistor.

[0011] The STB pin of the CAN transceiver is connected to a CAN_C signal, and the STB pin is also connected to a third power supply voltage through a third resistor;

[0012] The SPLIT pin is also connected to the CANL pin via a fourth resistor and a fifth resistor connected in parallel with the fourth resistor.

[0013] The CANL pin is connected to the ground terminal via a first capacitor.

[0014] The CANL pin is connected to the K1 terminal of a CAN bus ESD diode, the CANH pin is connected to the K2 terminal of a CAN bus ESD diode, and the KC terminal of the CAN bus ESD diode is connected to the ground terminal.

[0015] The VCC terminal of the CAN transceiver is connected to a second power supply voltage, and the second power supply voltage is connected to the ground terminal through a second capacitor.

[0016] The TXD pin of the CAN transceiver is connected to the CAN0_RX pin of the microcontroller, and the RXD pin of the CAN transceiver is connected to the CAN0_TX pin of the microcontroller.

[0017] The communication protocol conversion board of this utility model has the VBAT pin, VDD pin, and VDDA pin of the microcontroller connected to a third power supply voltage, and the VBAT pin connected to the ground terminal through a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor connected in parallel.

[0018] The VSSA and VSS pins of the microcontroller are connected to the ground terminal;

[0019] The microcontroller TAMPER-RTC pin is connected to the ground terminal via a sixth resistor;

[0020] The microcontroller's OSC_IN pin receives the EXTAL signal and is connected to ground via a seventh capacitor. The OSC_OUT pin outputs the XTAL signal and is connected to ground via an eighth capacitor. The OSC_IN and OSC_OUT pins are connected to a crystal oscillator.

[0021] The NRST pin of the microcontroller is connected to the third power supply voltage through a seventh resistor, the NRST pin is connected to the ground terminal through switch S1, and the NRST pin is also connected to the ground terminal through a ninth capacitor.

[0022] The microcontroller's BOOT0 interface is connected to the IAP_HIGH signal;

[0023] The microcontroller's PA0 pin outputs an LED1 signal, which is connected to the ground terminal via an eighth resistor and a first light-emitting diode; the microcontroller's PA1 pin outputs an LED2 signal, which is connected to the ground terminal via a ninth resistor and a second light-emitting diode.

[0024] The communication protocol conversion board of this utility model has a first pin of the JTAG connector connected to a third power supply voltage and connected to the ground terminal through a tenth capacitor; the second pin of the JTAG connector is connected to the JTMS pin, and the JTMS pin is connected to the third power supply voltage through a tenth resistor.

[0025] The third and fifth pins of the JTAG connector are connected to the ground terminal;

[0026] The fourth pin of the JTAG connector is connected to the JTCK pin;

[0027] The fifth pin of the JTAG connector is connected to the JTDO pin;

[0028] The seventh pin of the JTAG connector is connected to the USART0_RX terminal of the microcontroller;

[0029] The ninth pin of the JTAG connector is connected to the USART0_TX terminal of the microcontroller.

[0030] The eighth pin of the JTAG connector is connected to the JTDI pin;

[0031] The tenth pin of the JTAG connector is connected to the nJTRST pin.

[0032] The communication protocol conversion board of this utility model includes a DIP switch. The NO_1 pin of the DIP switch is connected to the BOOT0 pin of the microcontroller, and the NO_2 pin of the DIP switch is connected to the PA4 pin of the microcontroller. The PA4 pin is connected to the MODE2 signal.

[0033] The NO_3 pin of the DIP switch is connected to the PA5 pin of the microcontroller, and the PA5 pin is connected to the MODE1 signal;

[0034] The NO_4 pin of the DIP switch is connected to the PA6 pin of the microcontroller, and the PA6 pin is connected to the MODE0 signal;

[0035] The COM_1 pin of the DIP switch is connected to the third power supply voltage, and the COM_2, COM_3, and COM_4 pins of the DIP switch are connected to the ground terminal.

[0036] The NO_1 pin of the DIP switch is connected to the ground terminal through the eighth pin of a fuse;

[0037] The NO_2 pin of the DIP switch is connected to the third power supply voltage through the seventh pin of the fuse;

[0038] The NO_3 pin of the DIP switch is connected to the third power supply voltage through the sixth pin of the fuse;

[0039] The NO_4 pin of the DIP switch is connected to the third power supply voltage through the fifth pin of the fuse;

[0040] The third power supply voltage is connected to the ground terminal through the eleventh capacitor.

[0041] The communication protocol conversion board of this utility model includes a dual-channel buffer driver, wherein the first input terminal and the second input terminal of the dual-channel buffer driver are connected to the BOOT0 interface of the microcontroller.

[0042] The first open-drain output of the dual-channel buffer driver is connected to the STB pin of the CAN transceiver.

[0043] The second open-drain output of the dual-channel buffer driver is connected to a MESE_C signal;

[0044] The VCC terminal of the dual-channel buffer driver is connected to a third power supply voltage;

[0045] The third power supply voltage is connected to the ground terminal through the twelfth capacitor.

[0046] The communication protocol conversion board of this utility model also includes a serial communication transceiver. The receiver output terminal of the serial communication transceiver is connected to the USART1_RX pin of the microcontroller, the driver input terminal of the serial communication transceiver is connected to the USART1_TX pin of the microcontroller, and the receive output enable terminal and the driver input enable terminal of the serial communication transceiver are connected to the PB6 pin of the microcontroller.

[0047] The non-inverting input of the serial communication transceiver is connected to the second pin of the RS485 connector.

[0048] The inverting input of the serial communication transceiver is connected to the third pin of the RS485 connector;

[0049] The first pin of the RS485 connector is connected to the ground terminal;

[0050] A first TVS protection device is connected between the non-inverting input terminal and the inverting input terminal;

[0051] The inverting input terminal is connected to the A1 terminal of a second TVS protection device, the non-inverting input terminal is connected to the A2 terminal of a second TVS protection device, and the AC terminal of the second TVS protection device is connected to the ground terminal.

[0052] The VCC terminal of the serial communication transceiver is connected to the third power supply voltage, and the VCC terminal of the serial communication transceiver is connected to the ground terminal through the thirteenth capacitor.

[0053] The communication protocol conversion circuit board of this utility model has a first end of the elevator direct transmission signal connector connected to a first power supply voltage through a first rectifier diode.

[0054] The first end of the elevator direct signal connector is also connected to the grounding end through the fourteenth capacitor and the fifteenth capacitor, respectively.

[0055] The first end of the elevator direct signal connector is also connected to the grounding terminal by sequentially connecting the eleventh resistor, the twelfth resistor, and the thirteenth resistor in series.

[0056] The point where the eleventh resistor and the twelfth resistor are connected is connected to the second end of the elevator direct-transmission signal connector; the point where the twelfth resistor and the thirteenth resistor are connected is connected to the first input terminal of the first NOR gate, the second input terminal of the first NOR gate is connected to the ground terminal, the first input terminal of the first NOR gate is also connected to the ground terminal through the sixteenth capacitor, the output terminal of the first NOR gate is connected to the first input terminal and the second input terminal of the second NOR gate, and the output terminal of the second NOR gate is connected to the USART2_RX pin of the microcontroller;

[0057] The first input terminal of a third NOR gate is connected to the MESE_C signal, and the second input terminal of the third NOR gate is connected to the USART2_TX pin of the microcontroller; the output terminal of the third NOR gate is connected to the base of a bipolar transistor through a fourteenth resistor, the emitter of the bipolar transistor is connected to the ground terminal, and the collector of the bipolar transistor is connected to the fourth terminal of the elevator direct transmission signal connector through a fifteenth resistor.

[0058] The base of the bipolar transistor is connected to the ground terminal through the sixteenth resistor;

[0059] The seventeenth resistor is connected between the fourth and first ends of the elevator direct signal connector.

[0060] The fourth end of the elevator direct signal connector is also connected to the ground end through a second rectifier diode;

[0061] The MESE_C signal is connected to the third power supply voltage through an eighteenth resistor;

[0062] The second input terminal of the third NOR gate is connected to the third power supply voltage through a nineteenth resistor;

[0063] The third power supply voltage is connected to the ground terminal through the seventeenth capacitor.

[0064] The communication protocol conversion board of this utility model includes a power management circuit.

[0065] The first power converter has an input terminal connected to a first power supply voltage, which is connected to the cathode of a first diode. The anode of the first diode is connected to the power input terminal of a power connector via a fuse. The output terminal of the first power converter outputs a second power supply voltage.

[0066] A second power converter, the input of which is connected to the output of the first power converter, and the output of which outputs a third power supply voltage;

[0067] The power input terminal is connected to the ground terminal through a metal oxide varistor.

[0068] The anode of the first diode is connected to the ground terminal through a transient voltage suppressor;

[0069] The cathode of the first diode is connected to the ground terminal through the eighteenth capacitor;

[0070] The input terminal of the first power converter is connected to the ground terminal through the nineteenth capacitor;

[0071] The output terminal of the first power converter is connected to the ground terminal through the twentieth capacitor;

[0072] The input terminal of the second power converter is connected to the ground terminal through the twenty-first capacitor;

[0073] The output terminal of the second power converter is connected to the ground terminal through the twenty-second capacitor and the twenty-third capacitor connected in parallel with the twenty-second capacitor.

[0074] A smart device includes the aforementioned communication protocol conversion board.

[0075] Beneficial effects: It provides an optimized communication protocol conversion board, reduces signal interference, and improves communication speed and stability. Attached Figure Description

[0076] Figure 1 This is a circuit diagram of the first part U1A of the microcontroller of this utility model;

[0077] Figure 2 This is a circuit diagram of the second part U1B of the microcontroller of this utility model;

[0078] Figure 3 This is a circuit connection diagram of the CAN transceiver and CAN connector of this utility model;

[0079] Figure 4This is a circuit connection diagram of the JTAG connector of this utility model;

[0080] Figure 5 This is a circuit connection diagram of the DIP switch of this utility model;

[0081] Figure 6 This is a circuit connection diagram of the dual-channel cache driver of this utility model;

[0082] Figure 7 This is a circuit connection diagram of the serial communication transceiver of this utility model;

[0083] Figure 8 This is a circuit connection diagram of the elevator direct transmission signal connector of this utility model;

[0084] Figure 9 This is a circuit connection diagram of the power management circuit of this utility model;

[0085] Figure 10 This is a schematic diagram of the hardware topology of this utility model. Detailed Implementation

[0086] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0087] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0088] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0089] Reference Figures 1 to 10 A communication protocol conversion board, comprising:

[0090] Microcontroller U1, the VBAT pin of microcontroller U1 is connected to a power management circuit P;

[0091] JTAG connector J1 connects the microcontroller's USART0_TX and USART0_RX pins to the microcontroller's JTMS, JTCK, JTDI, JTDO, and nJTRST pins.

[0092] The CAN transceiver U2 connects the microcontroller's CAN0_RX and CAN0_TX pins to the CAN connector J4.

[0093] The elevator direct signal connector J2 is connected to the USART2_RX and USART2_TX pins of the microcontroller.

[0094] This invention provides an optimized communication protocol conversion board. The JTAG connector serves as a microcontroller programming port, allowing the microcontroller program to be burned in. The elevator direct transmission signal connector is used to interact with the original elevator direct transmission protocol. The CAN protocol is the main communication protocol used by this communication protocol conversion board. The acquired elevator direct transmission signal protocol is encrypted and output to a third party for interfacing, reducing signal interference, improving communication speed and stability, and reducing power consumption.

[0095] In a preferred embodiment of this utility model, the CANH pin of the CAN transceiver U2 is connected to the third pin of the CAN connector J4, the CANL pin of the CAN transceiver U2 is connected to the second pin of the CAN connector J4, and the SPLIT pin of the CAN transceiver U2 is connected to the CANH pin through a first resistor R1 and a second resistor R2 connected in parallel with the first resistor R1.

[0096] The STB pin of the CAN transceiver U2 is connected to a CAN_C signal, and the STB pin is also connected to the third power supply voltage +3V3 through the third resistor R3.

[0097] The SPLIT pin is also connected to the CANL pin via a fourth resistor R6 and a fifth resistor R8 connected in parallel with the fourth resistor R6.

[0098] The CANL pin is connected to the ground terminal through the first capacitor C4;

[0099] The CANL pin is connected to the K1 terminal of the CAN bus ESD diode D4, the CANH pin is connected to the K2 terminal of the CAN bus ESD diode D4, and the KC terminal of the CAN bus ESD diode D4 is connected to the ground terminal.

[0100] The VCC terminal of the CAN transceiver U2 is connected to the second power supply voltage +5V, and the second power supply voltage +5V is connected to the ground terminal through the second capacitor C1.

[0101] The TXD pin of CAN transceiver U2 is connected to the CAN0_RX pin of the microcontroller, and the RXD pin of CAN transceiver U2 is connected to the CAN0_TX pin of the microcontroller.

[0102] This invention achieves signal integrity control through a differential impedance matching network and power ripple suppression, bus surge absorption, and electrostatic protection through a filtering network. Through multiple protection and signal optimization mechanisms, it significantly improves the reliability and anti-interference capability of CAN bus communication, realizes stable transmission of CAN communication in elevator environments, and reduces system power consumption.

[0103] In a preferred embodiment of this utility model, the VBAT pin, VDD pin, and VDDA pin of the microcontroller are connected to the third power supply voltage +3V3, and the VBAT pin is connected to the ground terminal through the third capacitor C17, the fourth capacitor C18, the fifth capacitor C19, and the sixth capacitor C20 connected in parallel.

[0104] The VSSA and VSS pins of the microcontroller are connected to the ground terminal;

[0105] The microcontroller TAMPER-RTC pin is connected to ground via the sixth resistor R17;

[0106] The microcontroller's OSC_IN pin receives the EXTAL signal and is connected to ground via the seventh capacitor C22. The OSC_OUT pin outputs the XTAL signal and is connected to ground via the eighth capacitor C2f. The OSC_IN and OSC_OUT pins are connected to a crystal oscillator YD1.

[0107] The microcontroller’s NRST pin is connected to the third power supply voltage +3V3 through the seventh resistor R18, the NRST pin is connected to the ground terminal through the switch S1, and the NRST pin is also connected to the ground terminal through a ninth capacitor C23.

[0108] The microcontroller's BOOT0 interface is connected to the IAP_HIGH signal;

[0109] The microcontroller's PA0 pin outputs the LED1 signal, which is connected to the ground terminal via the eighth resistor R27 and the first LED D8 in sequence; the microcontroller's PA1 pin outputs the LED2 signal, which is connected to the ground terminal via the ninth resistor R22 and the second LED D7 in sequence.

[0110] This invention significantly improves the reliability of the microcontroller through multi-dimensional optimization, including power supply optimization, anti-interference reset, and precise clock design, thereby enhancing the system's stable operation in complex electromagnetic environments (such as elevator control).

[0111] In a preferred embodiment of this utility model, the first pin of the JTAG connector J1 is connected to the third power supply voltage +3V3 and is connected to the ground terminal through the tenth capacitor C28; the second pin of the JTAG connector J1 is connected to the JTMS pin, and the JTMS pin is connected to the third power supply voltage +3V3 through the tenth resistor R20.

[0112] The third and fifth pins of the JTAG connector J1 are connected to the ground terminal;

[0113] The fourth pin of JTAG connector J1 is connected to the JTCK pin;

[0114] The fifth pin of JTAG connector J1 is connected to the JTDO pin;

[0115] The seventh pin of the JTAG connector J1 is connected to the USART0_RX terminal of the microcontroller;

[0116] The ninth pin of the JTAG connector J1 is connected to the USART0_TX terminal of the microcontroller.

[0117] The eighth pin of the JTAG connector J1 is connected to the JTDI pin;

[0118] The tenth pin of the JTAG connector J1 is connected to the nJTRST pin.

[0119] The JTAG interface of this invention ensures signal integrity, reduces noise interference, saves hardware resources, and improves development flexibility and efficiency.

[0120] A preferred embodiment of this utility model includes a DIP switch S2, wherein the NO_1 pin of the DIP switch S2 is connected to the BOOT0 pin of the microcontroller, the NO_2 pin of the DIP switch S2 is connected to the PA4 pin of the microcontroller, and the PA4 pin is connected to the MODE2 signal.

[0121] The NO_3 pin of the DIP switch S2 is connected to the PA5 pin of the microcontroller, and the PA5 pin is connected to the MODE1 signal;

[0122] The NO_4 pin of the DIP switch S2 is connected to the PA6 pin of the microcontroller, and the PA6 pin is connected to the MODE0 signal;

[0123] The COM_1 pin of the DIP switch S2 is connected to the third power supply voltage +3V3, and the COM_2, COM_3, and COM_4 pins of the DIP switch S2 are connected to the ground terminal.

[0124] The NO_1 pin of the DIP switch S2 is connected to the ground terminal through the eighth pin of a fuse RN2;

[0125] The NO_2 pin of the DIP switch S2 is connected to the third power supply voltage +3V3 through the seventh pin of the fuse RN2;

[0126] The NO_3 pin of the DIP switch S2 is connected to the third power supply voltage +3V3 through the sixth pin of the fuse RN2;

[0127] The NO_4 pin of the DIP switch S2 is connected to the third power supply voltage +3V3 through the fifth pin of the fuse RN2;

[0128] The third power supply voltage, +3V3, is connected to the ground terminal through the eleventh capacitor, C6.

[0129] This invention enables multi-mode configuration and parameter setting functions of the microcontroller through a DIP switch, meeting the needs of rapid switching and flexible configuration of the elevator control system.

[0130] A preferred embodiment of this utility model includes a dual-channel buffer driver U3, wherein the first input terminal (1A) and the second input terminal (2A) of the dual-channel buffer driver U3 are connected to the BOOT0 interface of the microcontroller.

[0131] The first open-drain output 1Y of the dual-channel buffer driver U3 is connected to the STB pin of the CAN transceiver.

[0132] The second open-drain output 2Y of the dual-channel buffer driver U3 is connected to a MESE_C signal;

[0133] The VCC terminal of the dual-channel buffer driver U3 is connected to a third power supply voltage of +3V3.

[0134] The third power supply voltage, +3V3, is connected to the ground terminal through the twelfth capacitor, C7.

[0135] The aforementioned removal features achieve signal isolation and drive enhancement, avoiding signal attenuation or infection, and adapting to the needs of complex systems.

[0136] In a preferred embodiment of this utility model, a serial communication transceiver U5 is further included. The receiver output terminal RO of the serial communication transceiver U5 is connected to the USART1_RX pin of the microcontroller, the driver input terminal DI of the serial communication transceiver U5 is connected to the USART1_TX pin of the microcontroller, and the receive output enable terminal of the serial communication transceiver U5 is also included. The drive input enable terminal DE is connected to the microcontroller's PB6 pin;

[0137] The non-inverting input A of the serial communication transceiver U5 is connected to the second pin of the RS485 connector J3;

[0138] The inverting input B of the serial communication transceiver U5 is connected to the third pin of the RS485 connector J3;

[0139] The first pin of RS485 connector J3 is connected to the ground terminal;

[0140] The first TVS protection device D5 is connected between the non-inverting input terminal A and the inverting input terminal B;

[0141] The inverting input terminal B is connected to the A1 terminal of a second TVS protection device D6, the non-inverting input terminal A is connected to the A2 terminal of a second TVS protection device D6, and the AC terminal of the second TVS protection device D6 is connected to the ground terminal.

[0142] The VCC terminal of the serial communication transceiver U5 is connected to the third power supply voltage +3V3, and the VCC terminal of the serial communication transceiver U5 is connected to the ground terminal through the thirteenth capacitor C14.

[0143] The RS485 interface serves as a backup interface, using the RS485 protocol for various low-voltage functions in elevator products. This reserved interface allows for hardware pre-installation for future functional expansion.

[0144] In a preferred embodiment of the present invention, the first end of the elevator direct signal connector J2 is connected to a first power supply voltage of +12V through a first rectifier diode D1;

[0145] The first end of the elevator direct signal connector J2 is also connected to the ground terminal through the fourteenth capacitor C2 and the fifteenth capacitor C8 respectively;

[0146] The first end of the elevator direct signal connector J2 is also connected to the ground terminal by sequentially connecting the eleventh resistor R4, the twelfth resistor R5, and the thirteenth resistor R7 in series.

[0147] The point where the eleventh resistor R4 and the twelfth resistor R5 are connected is connected to the second terminal of the elevator direct transmission signal connector J2; the point where the twelfth resistor R5 and the thirteenth resistor R7 are connected is connected to the first input terminal of the first NOR gate U4A, the second input terminal of the first NOR gate U4A is connected to the ground terminal, the first input terminal of the first NOR gate U4A is also connected to the ground terminal through the sixteenth capacitor C3, the output terminal of the first NOR gate U4A is connected to the first input terminal and the second input terminal of the second NOR gate U4D, and the output terminal of the second NOR gate U4D is connected to the USART2_RX pin of the microcontroller;

[0148] The first input of the third NOR gate U4B is connected to the MESE_C signal, and the second input of the third NOR gate U4B is connected to the USART2_TX pin of the microcontroller; the output of the third NOR gate U4B is connected to the base of a bipolar transistor Q1 through the fourteenth resistor R14, the emitter of the bipolar transistor Q1 is connected to the ground terminal, and the collector of the bipolar transistor Q1 is connected to the fourth terminal of the elevator direct transmission signal connector J2 through the fifteenth resistor R11.

[0149] The base of bipolar transistor Q1 is connected to the ground terminal through the sixteenth resistor R16;

[0150] The seventeenth resistor R10 is connected between the fourth and first terminals of the elevator direct signal connector J2;

[0151] The fourth terminal of the elevator direct signal connector J2 is also connected to the ground terminal through the second rectifier diode D2;

[0152] The MESE_C signal is connected to the third power supply voltage +3V3 through an eighteenth resistor R13;

[0153] The second input terminal of the third NOR gate U4B is connected to the third power supply voltage +3V3 through a nineteenth resistor R12.

[0154] The third power supply voltage, +3V3, is connected to the ground terminal through the seventeenth capacitor, C5.

[0155] In a preferred embodiment of this utility model, the power management circuit P includes,

[0156] The first power converter U6 has an input terminal connected to a first power supply voltage +12V. The first power supply voltage +12V is connected to the cathode of the first diode D9. The anode of the first diode D9 is connected to the power input terminal Vin1 of the power connector J5 through a fuse F1. The output terminal of the first power converter U6 outputs a second power supply voltage +5V.

[0157] The second power converter U7 has its input terminal connected to the output terminal of the first power converter U6, and its output terminal outputs a third power supply voltage of +3V3.

[0158] The power input terminal Vin1 is connected to the ground terminal through a metal oxide varistor RV1;

[0159] The anode of the first diode D9 is connected to the ground terminal through a transient voltage suppressor D10;

[0160] The cathode of the first diode D9 is connected to the ground terminal through the eighteenth capacitor C24;

[0161] The input terminal of the first power converter (U6) is connected to the ground terminal through the nineteenth capacitor (C25);

[0162] The output terminal of the first power converter U6 is connected to the ground terminal through the twentieth capacitor C26;

[0163] The input terminal of the second power converter U7 is connected to the ground terminal through the twenty-first capacitor C27;

[0164] The output of the second power converter U7 is connected to the ground terminal through the twenty-second capacitor C29 and the twenty-third capacitor C30 connected in parallel with the twenty-second capacitor C29.

[0165] This utility model's communication protocol conversion board embodies precision and efficiency, is suitable for use in various complex communication systems, ensures the reliability of data communication, uses low-power components to effectively reduce the power consumption of integrated circuits, and in addition, the circuit layout reduces electromagnetic interference and improves the signal's anti-interference capability.

[0166] This invention also provides a smart device, including a communication protocol conversion board. This communication protocol conversion board is suitable for use in various embedded systems and smart devices to improve the efficiency and reliability of data communication.

[0167] The description and accompanying drawings provide typical embodiments of specific structures for specific implementations. Other modifications are possible based on the spirit of this invention. Although the above-described preferred embodiments are presented, they are not intended to be limiting.

[0168] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be considered as covering all changes and modifications that encompass the true intent and scope of this utility model. Any and all equivalent scope and content within the scope of the claims should be considered as still falling within the intent and scope of this utility model.

Claims

1. A communication protocol conversion board, characterized in that, include: A microcontroller (U1) has its VBAT pin connected to a power management circuit. The USART0_TX and USART0_RX pins of the microcontroller (U1) are connected to the JTMS, JTCK, JTDI, JTDO, and nJTRST pins of the microcontroller via the JTAG connector (J1). The CAN transceiver (U2) connects the CAN0_RX and CAN0_TX pins of the microcontroller (U1) to the CAN connector (J4) via the CAN transceiver (U2). The elevator direct signal connector (J2) is connected to the USART2_RX and USART2_TX pins of the microcontroller (U1).

2. The communication protocol conversion board according to claim 1, characterized in that, The CANH pin of the CAN transceiver (U2) is connected to the third pin of the CAN connector (J4), the CANL pin of the CAN transceiver (U2) is connected to the second pin of the CAN connector (J4), and the SPLIT pin of the CAN transceiver (U2) is connected to the CANH pin through a first resistor (R1) and a second resistor (R2) connected in parallel with the first resistor (R1). The STB pin of the CAN transceiver (U2) is connected to a CAN_C signal, and the STB pin is also connected to a third power supply voltage through a third resistor (R3). The SPLIT pin is also connected to the CANL pin via a fourth resistor (R6) and a fifth resistor (R8) connected in parallel with the fourth resistor (R6); The CANL pin is connected to the ground terminal via the first capacitor (C4); The CANL pin is connected to the K1 terminal of a CAN bus ESD diode (D4), the CANH pin is connected to the K2 terminal of a CAN bus ESD diode (D4), and the KC terminal of the CAN bus ESD diode (D4) is connected to the ground terminal. The VCC terminal of the CAN transceiver (U2) is connected to a second power supply voltage, which is connected to the ground terminal through a second capacitor (C1). The TXD pin of the CAN transceiver (U2) is connected to the CAN0_RX pin of the microcontroller (U1), and the RXD pin of the CAN transceiver (U2) is connected to the CAN0_TX pin of the microcontroller (U1).

3. The communication protocol conversion board according to claim 1, characterized in that, The VBAT, VDD, and VDDA pins of the microcontroller (U1) are connected to a third power supply voltage. The VBAT pin is connected to the ground terminal through a third capacitor (C17), a fourth capacitor (C18), a fifth capacitor (C19), and a sixth capacitor (C20) connected in parallel. The VSSA and VSS pins of the microcontroller (U1) are connected to the ground terminal; The TAMPER-RTC pin of the microcontroller (U1) is connected to the ground terminal through the sixth resistor (R17); The microcontroller (U1) inputs an EXTAL signal to its OSC_IN pin, which is connected to the ground terminal through the seventh capacitor (C22). The OSC_OUT pin outputs an XTAL signal, which is connected to the ground terminal through the eighth capacitor (C2f). The OSC_IN pin and the OSC_OUT pin are connected to a crystal oscillator (YD1). The NRST pin of the microcontroller (U1) is connected to the third power supply voltage through the seventh resistor (R18), the NRST pin is connected to the ground terminal through the switch S1, and the NRST pin is also connected to the ground terminal through a ninth capacitor (C23). The BOOT0 interface of the microcontroller (U1) is connected to the IAP_HIGH signal; The microcontroller (U1) outputs an LED1 signal from its PA0 pin, which is connected to the ground terminal via the eighth resistor (R27) and the first light-emitting diode (D8) in sequence; the microcontroller (U1) outputs an LED2 signal from its PA1 pin, which is connected to the ground terminal via the ninth resistor (R22) and the second light-emitting diode (D7) in sequence.

4. The communication protocol conversion board according to claim 1, characterized in that, The first pin of the JTAG connector (J1) is connected to the third power supply voltage and to the ground terminal through the tenth capacitor (C28); the second pin of the JTAG connector (J1) is connected to the JTMS pin, and the JTMS pin is connected to the third power supply voltage through the tenth resistor (R20). The third and fifth pins of the JTAG connector (J1) are connected to the ground terminal; The fourth pin of the JTAG connector (J1) is connected to the JTCK pin; The fifth pin of the JTAG connector (J1) is connected to the JTDO pin; The seventh pin of the JTAG connector (J1) is connected to the USART0_RX terminal of the microcontroller (U1); The ninth pin of the JTAG connector (J1) is connected to the USART0_TX terminal of the microcontroller (U1); The eighth pin of the JTAG connector (J1) is connected to the JTDI pin; The tenth pin of the JTAG connector (J1) is connected to the nJTRST pin.

5. The communication protocol conversion board according to claim 1, characterized in that, Includes a DIP switch (S2), the NO_1 pin of the DIP switch (S2) is connected to the BOOT0 pin of the microcontroller (U1), the NO_2 pin of the DIP switch (S2) is connected to the PA4 pin of the microcontroller (U1), and the PA4 pin is connected to the MODE2 signal; The NO_3 pin of the DIP switch (S2) is connected to the PA5 pin of the microcontroller (U1), and the PA5 pin is connected to the MODE1 signal; The NO_4 pin of the DIP switch (S2) is connected to the PA6 pin of the microcontroller (U1), and the PA6 pin is connected to the MODE0 signal; The COM_1 pin of the DIP switch (S2) is connected to the third power supply voltage, and the COM_2, COM_3, and COM_4 pins of the DIP switch (S2) are connected to the ground terminal. The NO_1 pin of the DIP switch (S2) is connected to the ground terminal through the eighth pin of a fuse (RN2); The NO_2 pin of the DIP switch (S2) is connected to the third power supply voltage through the seventh pin of the fuse (RN2); The NO_3 pin of the DIP switch (S2) is connected to the third power supply voltage through the sixth pin of the fuse (RN2); The NO_4 pin of the DIP switch (S2) is connected to the third power supply voltage through the fifth pin of the fuse (RN2); The third power supply voltage is connected to the ground terminal through the eleventh capacitor (C6).

6. The communication protocol conversion board according to claim 1, characterized in that, Includes a dual-channel buffer driver (U3), the first input (1A) and the second input (2A) of the dual-channel buffer driver (U3) being connected to the BOOT0 interface of the microcontroller (U1); The first open-drain output (1Y) of the dual-channel buffer driver (U3) is connected to the STB pin of the CAN transceiver; The second open-drain output (2Y) of the dual-channel buffer driver (U3) is connected to a MESE_C signal; The VCC terminal of the dual-channel buffer driver (U3) is connected to a third power supply voltage; The third power supply voltage is connected to the ground terminal through the twelfth capacitor (C7).

7. The communication protocol conversion board according to claim 3, characterized in that, It also includes a serial communication transceiver (U5), the receiver output (RO) of which is connected to the USART1_RX pin of the microcontroller (U1), the driver input (DI) of which is connected to the USART1_TX pin of the microcontroller (U1), and the receive output enable pin of which is... The drive input enable terminal (DE) is connected to the PB6 pin of the microcontroller (U1); The non-inverting input (A) of the serial communication transceiver (U5) is connected to the second pin of the RS485 connector (J3); The inverting input (B) of the serial communication transceiver (U5) is connected to the third pin of the RS485 connector (J3); The first pin of the RS485 connector (J3) is connected to the ground terminal; A first TVS protection device (D5) is connected between the non-inverting input terminal (A) and the inverting input terminal (B). The inverting input terminal (B) is connected to the A1 terminal of a second TVS protection device (D6), the non-inverting input terminal (A) is connected to the A2 terminal of a second TVS protection device (D6), and the AC terminal of the second TVS protection device (D6) is connected to the ground terminal. The VCC terminal of the serial communication transceiver (U5) is connected to the third power supply voltage, and the VCC terminal of the serial communication transceiver (U5) is connected to the ground terminal through the thirteenth capacitor (C14).

8. The communication protocol conversion board according to claim 6, characterized in that, The first end of the elevator direct signal connector (J2) is connected to the first power supply voltage through the first rectifier diode (D1); The first end of the elevator direct signal connector (J2) is also connected to the grounding terminal through the fourteenth capacitor (C2) and the fifteenth capacitor (C8); The first end of the elevator direct signal connector (J2) is also connected to the ground terminal by sequentially connecting the eleventh resistor (R4), the twelfth resistor (R5), and the thirteenth resistor (R7). The point where the eleventh resistor (R4) and the twelfth resistor (R5) are connected is connected to the second end of the elevator direct signal connector (J2); the point where the twelfth resistor (R5) and the thirteenth resistor (R7) are connected is connected to the first input terminal of the first NOR gate (U4A), the second input terminal of the first NOR gate (U4A) is connected to the ground terminal, the first input terminal of the first NOR gate (U4A) is also connected to the ground terminal through the sixteenth capacitor (C3), the output terminal of the first NOR gate (U4A) is connected to the first input terminal and the second input terminal of the second NOR gate (U4D), and the output terminal of the second NOR gate (U4D) is connected to the USART2_RX pin of the microcontroller (U1); The first input terminal of a third NOR gate (U4B) is connected to the MESE_C signal, and the second input terminal of the third NOR gate (U4B) is connected to the USART2_TX pin of the microcontroller (U1); the output terminal of the third NOR gate (U4B) is connected to the base of a bipolar transistor (Q1) through a fourteenth resistor (R14), the emitter of the bipolar transistor (Q1) is connected to ground, and the collector of the bipolar transistor (Q1) is connected to the fourth terminal of the elevator direct-drive signal connector (J2) through a fifteenth resistor (R11); The base of the bipolar transistor (Q1) is connected to the ground terminal through the sixteenth resistor (R16); The elevator direct signal connector (J2) is connected between the fourth and first terminals by a seventeenth resistor (R10). The fourth terminal of the elevator direct signal connector (J2) is also connected to the ground terminal through the second rectifier diode (D2); The MESE_C signal is connected to the third power supply voltage through an eighteenth resistor (R13); The second input terminal of the third NOR gate (U4B) is connected to the third power supply voltage through a nineteenth resistor (R12); The third power supply voltage is connected to the ground terminal through the seventeenth capacitor (C5).

9. The communication protocol conversion board according to claim 1, characterized in that, The power management circuit includes, The first power converter (U6) has its input terminal connected to a first power supply voltage, which is connected to the cathode of a first diode (D9). The anode of the first diode (D9) is connected to the power input terminal (Vin1) of the power connector (J5) through a fuse (F1). The output terminal of the first power converter (U6) outputs a second power supply voltage. The second power converter (U7) has its input terminal connected to the output terminal of the first power converter (U6), and its output terminal outputs a third power supply voltage. The power input terminal (Vin1) is connected to the ground terminal through a metal oxide varistor (RV1); The anode of the first diode (D9) is connected to the ground terminal through a transient voltage suppressor (D10); The cathode of the first diode (D9) is connected to the ground terminal through the eighteenth capacitor (C24); The input terminal of the first power converter (U6) is connected to the ground terminal through the nineteenth capacitor (C25); The output terminal of the first power converter (U6) is connected to the ground terminal through the twentieth capacitor (C26); The input terminal of the second power converter (U7) is connected to the ground terminal through the twenty-first capacitor (C27); The output terminal of the second power converter (U7) is connected to the ground terminal through the twenty-second capacitor (C29) and the twenty-third capacitor (C30) connected in parallel with the twenty-second capacitor (C29).

10. A smart device, characterized in that, The communication protocol conversion board includes any one of claims 1 to 9.

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