Controller communication detection circuit and apparatus

Abstract

The utility model relates to test circuit technical field discloses a kind of controller communication detection circuit and device, comprising: CAN communication module, LIN communication module, ethernet communication module and main control module;Main control module is connected with CAN communication module, LIN communication module and ethernet communication module respectively, and main control module is used to respectively control CAN communication module, LIN communication module and ethernet communication module to send test CAN communication message, test LIN communication message and test ethernet communication message to measured controller, and the response CAN communication message, response LIN communication message and response ethernet communication message sent by measured controller response test CAN communication message, test LIN communication message and test ethernet communication message are respectively received by CAN communication module, LIN communication module and ethernet communication module, the utility model can realize multiple communication function test, improve test efficiency.

Description

Technical Field

[0001] This utility model relates to the field of test circuit technology, and in particular to a controller communication detection circuit and device. Background Technology

[0002] Controller communication testing refers to the technical process of systematically testing and verifying the communication network of control units. Its core objective is to ensure that data transmitted between controllers via buses (such as Controller Area Network (CAN), Local Interconnect Network (LIN), Ethernet, etc.) meets the requirements of real-time performance, reliability, security, and protocol compliance.

[0003] Currently, most controller testing devices use a circuit structure of CAN module + control chip or LIN module + control chip. Each testing device can only test one communication method. When it is necessary to test different communication functions of the controller, additional testing devices of the corresponding type are required, making the testing process cumbersome and inefficient.

[0004] With the trend of intelligent and connected electronic products, conventional controller communication testing devices are far from meeting the testing needs of many vehicle controllers in terms of testing methods and costs. Therefore, there is an urgent need for a testing solution that can perform functional testing on multiple communication methods in controllers, especially vehicle controllers. Utility Model Content

[0005] In view of this, the present invention provides a controller communication detection circuit and device to solve or partially solve the technical problem that the detection device of the controller in the prior art can only detect one communication method and has a single function.

[0006] The technical solution proposed by this utility model is as follows: In a first aspect, this utility model provides a controller communication detection circuit, comprising: a CAN communication module, a LIN communication module, an Ethernet communication module, and a main control module; the LIN communication module is connected to the main control module and is used to realize LIN communication between the main control module and the controller under test; the CAN communication module is connected to the main control module and is used to realize CAN communication between the main control module and the controller under test; the Ethernet communication module is connected to the main control module and is used to realize Ethernet communication between the main control module and the controller under test; the main control module is used to control the CAN communication module, the LIN communication module, and the Ethernet communication module to send test CAN communication messages, test LIN communication messages, and test Ethernet communication messages to the controller under test, and to receive response CAN communication messages, response LIN communication messages, and response Ethernet communication messages sent by the controller under test in response to the test CAN communication messages, test LIN communication messages, and test Ethernet communication messages, respectively, through the CAN communication module, the LIN communication module, and the Ethernet communication module.

[0007] Optionally, the controller communication detection circuit further includes a power supply module, which includes a step-down circuit, a first linear regulator, and a second linear regulator. The input of the step-down circuit is connected to the power supply, and the output of the step-down circuit is connected to the inputs of the first and second linear regulators, respectively. The output of the first linear regulator is connected to the main control module, the CAN communication module, the LIN communication module, and the Ethernet communication module, respectively. The output of the second linear regulator is connected to the main control module, the CAN communication module, the LIN communication module, and the Ethernet communication module, respectively. The step-down circuit is used to convert the power supply voltage to a first voltage output, the first linear regulator is used to convert the first voltage to a third voltage output, and the second linear regulator is used to convert the first voltage to a second voltage output, wherein the first voltage is greater than the second voltage, and the second voltage is greater than the third voltage.

[0008] Optionally, the main control module includes a microcontroller and a CAN control chip. The microcontroller is connected to the CAN control chip, the CAN communication module, the LIN communication module, and the Ethernet communication module, respectively. The CAN control chip is connected to the CAN communication module. The microcontroller is used to control the CAN communication module to send test CAN communication messages to the controller under test through the CAN control chip, and to receive response CAN communication messages sent by the controller under test. It also sends test LIN communication messages and test Ethernet communication messages to the controller under test through the LIN communication module and the Ethernet communication module, respectively, and receives response LIN communication messages and response Ethernet communication messages sent by the controller under test.

[0009] Optionally, the main control module further includes a first inductor, a second inductor, a first diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a parallel capacitor bank. The first end of the first inductor is connected to the power supply. The second end of the first inductor is connected to the positive terminal of the first diode, the BSTD1 pin of the CAN control chip, and the BSTD2 pin of the CAN control chip. The negative terminal of the first diode is connected to the first end of the first capacitor, the first end of the second capacitor, the first end of the third capacitor, and the first end of the second inductor. The second end of the second inductor is connected to the first end of the fourth capacitor, the first end of the parallel capacitor bank, the VS1 pin of the CAN control chip, and the VS2 pin of the CAN control chip. The second end of the first capacitor is connected to the second end of the second capacitor, the second end of the third capacitor, the second end of the fourth capacitor, and the second end of the parallel capacitor bank and grounded.

[0010] Optionally, the main control module further includes a first resistor, a first transistor, a fifth capacitor, a sixth capacitor, and a seventh capacitor. The first end of the first resistor is connected to the cathode of the first diode, the first end of the fifth capacitor, and the VEXTIN pin of the CAN control chip. The second end of the fifth capacitor is grounded. The second end of the first resistor is connected to the emitter of the first transistor and the VEXTSH pin of the CAN control chip. The base of the first transistor is connected to the VEXTB pin of the CAN control chip. The collector of the first transistor is connected to the VEXTREF pin of the CAN control chip, the output of the first linear regulator, the first end of the sixth capacitor, and the first end of the seventh capacitor. The second ends of the sixth capacitor and the second ends of the seventh capacitor are connected and grounded.

[0011] Optionally, the CAN communication module includes a CAN transceiver, a signal isolation module, a second resistor, and an eighth capacitor. The CAN transceiver includes a first signal transmission pin, a CAN channel pin, a first sleep feedback pin, an enable pin, and a first wake-up pin. The first signal transmission pin, CAN channel pin, and first sleep feedback pin of the CAN transceiver are respectively connected to the CAN control chip. The CAN channel pin of the CAN transceiver is connected to the CAN bus of the controller under test through the signal isolation module. The first wake-up pin of the CAN transceiver is connected to the first end of the eighth capacitor and the first end of the second resistor, respectively. The second end of the second resistor is connected to the power supply, and the second end of the eighth capacitor is grounded.

[0012] Optionally, the CAN transceiver also includes a power supply voltage pin and a reference voltage pin. The CAN communication module also includes a ninth capacitor and a tenth capacitor. The power supply voltage pin is connected to the output of the second linear regulator and the first terminal of the ninth capacitor, respectively. The reference voltage pin is connected to the output of the first linear regulator and the first terminal of the tenth capacitor, respectively. The second terminals of the ninth capacitor and the tenth capacitor are both grounded.

[0013] Optionally, the LIN communication module includes a LIN communication chip, a third resistor, and an eleventh capacitor. The LIN communication chip includes a second signal transmission pin, a LIN channel pin, a second sleep feedback pin, a first sleep control pin, and a second wake-up pin. The second signal transmission pin, the second sleep feedback pin, and the first sleep control pin of the LIN communication chip are respectively connected to the microcontroller. The LIN channel pin is connected to the LIN bus of the controller under test. The second wake-up pin is connected to the first end of the eleventh capacitor and the first end of the third resistor. The second end of the third resistor is connected to the power supply. The second end of the eleventh capacitor is grounded.

[0014] Optionally, the Ethernet communication module includes an Ethernet communication chip, which includes an Ethernet signal transmission pin, a cable connection pin, a third sleep feedback pin, and a third wake-up pin. The Ethernet signal transmission pin, the third sleep feedback pin, and the third wake-up pin of the Ethernet communication chip are respectively connected to the microcontroller, and the cable connection pin of the Ethernet communication chip is connected to an Ethernet cable interface.

[0015] The second aspect of this utility model provides a controller communication detection device, including a controller communication detection circuit as described in any of the first aspects of this utility model.

[0016] This utility model has the following beneficial effects: The controller communication detection circuit of this utility model, by setting up a CAN communication module, a LIN communication module, an Ethernet communication module and a main control module, can simulate other devices to send test communication messages to the controller under test when testing the communication function of the controller under test. The CAN communication module, LIN communication module and Ethernet communication module can also receive the response communication messages returned by the controller under test, thereby determining whether the CAN communication, LIN communication and Ethernet communication functions of the controller under test are normal, realizing multiple communication function tests and improving testing efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a circuit block diagram of a controller communication detection circuit in one embodiment of the present invention; Figure 2 This is a circuit block diagram of another controller communication detection circuit in this embodiment of the present invention; Figure 3This is a circuit block diagram of the communication detection circuit of another controller in an embodiment of this utility model; Figure 4 This is a circuit diagram of the main control module in an embodiment of this utility model; Figure 5 for Figure 4 Enlarged schematic diagram of section 4A; Figure 6 for Figure 4 Enlarged schematic diagram of section 4B; Figure 7 This is a circuit diagram of the CAN communication module in an embodiment of this utility model; Figure 8 This is a circuit diagram of the LIN communication module in an embodiment of this utility model; Figure 9 This is a circuit diagram of the Ethernet communication module in an embodiment of this utility model; Figure 10 for Figure 9 Enlarged diagram of section A in the middle; Figure 11 for Figure 9 Enlarged diagram of section B; Figure 12 This is a flowchart illustrating the operation of the controller communication detection circuit in this embodiment of the present invention. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] In view of this, the present invention provides a controller communication detection circuit and device, which is applicable to the communication function detection of various electronic controllers, and is particularly applicable to the communication detection of vehicle controllers.

[0024] like Figure 1 As shown, the controller communication detection circuit of this utility model embodiment includes: CAN communication module, LIN communication module, Ethernet communication module, and main control module; The LIN communication module, connected to the main control module, is used to enable LIN communication between the main control module and the controller under test (DUT). The CAN communication module, also connected to the main control module, is used to enable CAN communication between the main control module and the DUT. The Ethernet communication module, connected to the main control module, is used to enable Ethernet communication between the main control module and the DUT. The main control module controls the CAN, LIN, and Ethernet communication modules to send test CAN, LIN, and Ethernet communication messages to the DUT, respectively, and receives the response CAN, LIN, and Ethernet communication messages from the DUT via these modules.

[0025] Specifically, the controller under test can be an in-vehicle controller, an industrial controller, etc.

[0026] The CAN communication module supports both CAN communication and CAN FD communication, and supports sleep / wake-up tests for each channel. It can not only verify the messages sent by the controller, but also send corresponding messages to the controller to verify the controller's message receiving function.

[0027] The LIN communication module is responsible for LIN communication detection, which is divided into master node and slave node detection.

[0028] The Ethernet communication module supports 100 Mbps Ethernet communication testing, as well as fault code and packet loss rate testing.

[0029] The main control module is primarily responsible for receiving and executing control commands and diagnosing and transmitting real-time operating data of the device. The CAN communication module, LIN communication module, and Ethernet communication module work together under the control of the main control module to complete the signal transmission and testing process, ensuring the communication signal quality of the controller under test.

[0030] Furthermore, the CAN communication module, LIN communication module, and Ethernet communication module all have multiple detection channels.

[0031] The CAN communication module supports 8-channel CAN / CAN FD communication, the LIN communication module supports 8-channel LIN communication, and the Ethernet communication module supports 6-channel Ethernet communication.

[0032] The main control module connects to the CAN, LIN, and Ethernet communication modules via a Serial Peripheral Interface (SPI). It receives CAN or Ethernet messages from the host computer and, based on these messages, controls the CAN, LIN, and Ethernet modules to simulate other devices sending test communication messages to the controller under test (DUT). The main control module also receives response communication messages from the DUT and forwards them to the host computer. The host computer verifies the received communication messages according to pre-defined verification rules to determine if the communication is normal. All modules work collaboratively under the control of the main control module to complete signal transmission and testing, ensuring the communication signal quality of the DUT.

[0033] The controller communication detection circuit of this utility model, by setting up a CAN communication module, a LIN communication module, an Ethernet communication module and a main control module, can simulate other devices to send test communication messages to the controller under test when testing the communication function of the controller under test. The CAN communication module, LIN communication module and Ethernet communication module can also receive the response communication messages returned by the controller under test, thereby determining whether the CAN communication, LIN communication and Ethernet communication functions of the controller under test are normal, realizing multiple communication function tests and improving testing efficiency.

[0034] The controller communication detection circuit of this utility model has independent communication modules of each type that do not affect each other. It can perform corresponding tests according to the characteristics of each communication node of the controller under test, thereby adopting independent test methods and test logic to ensure that each node of the communication network of the controller under test is fully tested. It can realize the detection of multiple communication methods such as CAN, CAN FD, LIN and Ethernet.

[0035] Combination Figure 2 and Figure 3As shown, in some embodiments, the controller communication detection circuit further includes a power supply module, which includes a step-down circuit, a first linear regulator, and a second linear regulator. The input terminal of the step-down circuit is connected to the power supply UB, and the output terminal of the step-down circuit is connected to the input terminals of the first linear regulator LDO1 and the second linear regulator LDO2, respectively. The output terminal of the first linear regulator LDO1 is connected to the main control module, the CAN communication module, the LIN communication module, and the Ethernet communication module, respectively. The output terminal of the second linear regulator LDO2 is connected to the main control module, the CAN communication module, the LIN communication module, and the Ethernet communication module, respectively. The step-down circuit is used to convert the power supply voltage of the power supply UB into a first voltage output, the first linear regulator LDO1 is used to convert the first voltage into a third voltage output, and the second linear regulator LDO2 is used to convert the first voltage into a second voltage output, wherein the first voltage is greater than the second voltage, and the second voltage is greater than the third voltage.

[0036] Specifically, the step-down circuit can be a BUCK step-down circuit or a linear step-down circuit.

[0037] Both the first linear regulator LDO1 and the second linear regulator LDO2 use the LM1117 chip to implement voltage reduction.

[0038] In one example, the first voltage is 5.8V, the second voltage is 5V, and the third voltage is 3.3V. The power supply UB supplies power to the power supply module and the main control module, converting the voltages to the required operating voltages for each module. After supplying power to the power supply module, the power supply UB first uses a step-down circuit to convert the voltage to a first voltage of 5.8V to power the first linear regulator LDO1 and the second linear regulator LDO2. The second linear regulator LDO2 then converts the input voltage to a second voltage of 5V to power each module. The first linear regulator LDO1 converts the input voltage to a third voltage of 3.3V to power each module.

[0039] Through multiple voltage conversions, more efficient power management can be achieved. The most suitable voltage conversion range can be selected for each conversion module, improving the energy conversion efficiency of the entire circuit. Electrical isolation can be achieved to enhance the system's safety and anti-interference capabilities. At the same time, electronic equipment can be protected from the effects of power fluctuations.

[0040] In some embodiments, the main control module includes a microcontroller unit (MCU) and a CAN control chip U301. The microcontroller is connected to the CAN control chip U301, a CAN communication module, a LIN communication module, and an Ethernet communication module. The CAN control chip U301 is connected to the CAN communication module. The microcontroller is used to control the CAN communication module to send test CAN communication messages to the controller under test through the CAN control chip U301, and to receive response CAN communication messages sent by the controller under test. It also sends test LIN communication messages and test Ethernet communication messages to the controller under test through the LIN communication module and the Ethernet communication module, and receives response LIN communication messages and response Ethernet communication messages sent by the controller under test.

[0041] Through the collaborative work of the microcontroller and the CAN control chip U301, precise control of the CAN communication module is achieved, enabling more flexible sending of test CAN communication messages and accurate reception of response messages, thereby improving the accuracy and reliability of CAN communication detection.

[0042] As the core control unit, the microcontroller can coordinate the work of various communication modules, realize the comprehensive detection and management of multiple communication methods, improve the overall performance of the controller's communication detection circuit, and send and receive messages through CAN messages and Ethernet commands. It is compatible with the communication methods of the vehicle controller, which facilitates overall control. At the same time, it can seamlessly connect with the automotive automated testing system, improve testing efficiency and data processing response, and has the advantages of high speed and high efficiency.

[0043] Furthermore, the main control module incorporates various protection circuits, such as filtering circuits, overvoltage protection circuits, undervoltage protection circuits, overcurrent protection circuits, signal isolation circuits, and terminating resistors, to protect the main control module from power fluctuations, signal interference, electrostatic discharge, and other adverse effects, thereby improving the circuit's safety and reliability. The main control module may also include a voltage conversion module as a backup power supply to other modules, further enhancing the reliability of the detection device.

[0044] like Figure 4 , Figure 5 and Figure 6As shown, the main control module uses a 3.3V third voltage and a 5V second voltage converted by the power supply module, as well as the power supply UB, for power supply. The CAN control chip U301 contains 4 CAN sub-modules, which are connected to the VCAN pin using the 5V second voltage as power supply. CAN0 serves as the communication CAN, mainly responsible for receiving control command messages and sending detection status commands. CAN1, CAN3, and CAN4 serve as function detection CANs, and theoretically, any CAN can be configured as a function detection node through software.

[0045] The VCAN pin of the CAN control chip U301 is connected to an LC filter circuit composed of inductor L304 and capacitor C313, which can more effectively suppress high-frequency ripple, reduce the extra power consumption caused by ripple, and improve the stability and reliability of power supply.

[0046] The WK pin of the CAN control chip U301 is connected to the microcontroller (not shown in the figure) through a series resistor R306. The main function of resistor R306 is current limiting. When the voltage state of the WK pin of the CAN control chip U301 changes, that is, from low level to high level or from high level to low level, the CAN control chip U301 will be woken up and enter the normal operation mode from the sleep mode.

[0047] In some embodiments, the main control module further includes a first inductor L301, a second inductor L303, a first diode D302, a first capacitor C303, a second capacitor C324, a third capacitor C347, a fourth capacitor C348, and a parallel capacitor bank. The first terminal of the first inductor L301 is connected to the power supply UB, and the second terminal of the first inductor L301 is connected to the positive terminal of the first diode D302, the BSTD1 pin of the CAN control chip U301, and the BSTD2 pin of the CAN control chip U301, respectively. The negative terminal of the first diode D302 is connected to the first inductor L303, the second inductor L303, the first diode D302, the second capacitor C303, the third capacitor C347, the fourth capacitor C348, and a parallel capacitor bank. The first terminal of capacitor C303, the first terminal of the second capacitor C324, the first terminal of the third capacitor C347, and the first terminal of the second inductor L303 are connected. The second terminal of the second inductor L303 is connected to the first terminal of the fourth capacitor C348, the first terminal of the parallel capacitor group, the VS1 pin of the CAN control chip U301, and the VS2 pin of the CAN control chip U301, respectively. The second terminal of the first capacitor C303 is connected to the second terminals of the second capacitor C324, the second terminal of the third capacitor C347, the second terminal of the fourth capacitor C348, and the second terminal of the parallel capacitor group and grounded.

[0048] Specifically, by controlling the switching states of the BSTD1 and BSTD2 pins of the CAN control chip U301, the Boost converter inside the CAN control chip U301 can store the energy of the input voltage in the first inductor L301 and release it in the next switching cycle, thereby achieving voltage boost.

[0049] The first inductor L301 serves as an energy storage inductor, and the first diode D302 serves as a reverse protection diode. The BSTD1 and BSTD2 pins of the CAN control chip U301 are connected between the first inductor L301 and the first diode D302, and are responsible for controlling the direction of energy transmission.

[0050] The primary function of the first capacitor C303 is ESD protection, while the primary function of the second capacitor C324 is filtering. The third capacitor C347 and the fourth capacitor C348, together with the second inductor L303, form a π-filter circuit to prevent high-frequency interference signals from entering the circuit, reduce ripple, and provide a stable power supply input.

[0051] The parallel capacitor bank includes capacitors C323, C322, C321, C304, C302, C305, and C318. Using a parallel capacitor bank can improve the filtering effect of the circuit.

[0052] Furthermore, the main control module also includes a first resistor R302, a first transistor Q302, a fifth capacitor C326, a sixth capacitor C329, and a seventh capacitor C310. The first end of the first resistor is connected to the cathode of the first diode D302, the first end of the fifth capacitor, and the VEXTIN pin of the CAN control chip U301. The second end of the fifth capacitor is grounded. The second end of the first resistor is connected to the emitter of the first transistor and the VEXTSH pin of the CAN control chip U301. The base of the first transistor is connected to the VEXTB pin of the CAN control chip U301. The collector of the first transistor is connected to the VEXTREF pin of the CAN control chip U301, the output of the first linear regulator LDO1, the first end of the sixth capacitor, and the first end of the seventh capacitor. The second ends of the sixth capacitor and the second ends of the seventh capacitor are connected and grounded.

[0053] The VEXTSH pin of the CAN control chip U301 is connected between the VEXTIN and VEXTB pins of the same chip via a first resistor R302, forming a current detection loop. By detecting voltage changes on the VEXTSH pin, an overcurrent protection mechanism is triggered, protecting the circuit from overcurrent damage. The VEXTREF pin provides the collector reference voltage for the first transistor Q302. When the voltage on the VEXTREF pin falls below a set threshold, the CAN control chip U301 stops operating and enters a safe mode.

[0054] The fifth, sixth, and seventh capacitors can filter and stabilize the power supply voltage, and at the same time, they can play a certain buffering role when the circuit malfunctions, thus enhancing the circuit's protection function.

[0055] Furthermore, the VBSENSE pin of the CAN control chip U301 is used to monitor the power supply voltage. The CAN control chip U301 can convert the input analog signal into a digital signal and perform voltage monitoring and overvoltage protection. Resistor R301 and capacitor C308 form an RC filter circuit to remove high-frequency noise in the power supply signal, ensuring stable power input and preventing false diagnoses.

[0056] The BCKSW pin of the CAN control chip U301 is used to step down the input voltage to a 3.3V output voltage, with an output current of up to 750mA. The VCC1 pin of the CAN control chip U301 is connected to the BCKSW pin, using the converted 3.3V voltage as the supply voltage. The main function of the inductor L302 is energy storage. The VIO pin of the CAN control chip U301 is connected to the VCC1 pin, providing a reference voltage for overvoltage and undervoltage monitoring. When the VIO pin voltage is lower than the set threshold, an undervoltage reset signal is generated to restart the main control module. When the VIO pin voltage is higher than the set threshold, a safety mode is triggered to protect the safe and stable operation of the entire detection device.

[0057] Capacitors C346, C311, C312, C316, C317, C314, and C319 are connected in parallel to improve the filtering effect of the power supply circuit. The INTN pin of the CAN control chip U301 is an active-low interrupt output used to report various interrupt events to the microcontroller. When the CAN control chip U301 wakes up from sleep mode or safe mode, the INTN pin of the CAN control chip U301 will send an interrupt signal to notify the microcontroller that it has been woken up. Under normal circumstances, the INTN pin of the CAN control chip U301 is connected to the VCC1 pin of the CAN control chip U301 through a current-limiting resistor R303 and remains in a weak pull-up state. When the voltage of the VIO pin of the CAN control chip U301 is higher or lower than the set reset threshold voltage range, it will trigger a soft reset of the main control module and simultaneously set the RSTN pin low, resetting the microcontroller. The PCFG pin of the CAN control chip U301 can be connected to ground (GND) or kept open to select different hardware configurations.

[0058] The CSN pin of the CAN control chip U301 is the chip select pin. The microcontroller selects the appropriate chip for communication by setting the CSN pin low. The CSN pin must be kept low for communication to occur; otherwise, the output of the SDO pin will be in a high-impedance state, and data cannot be received. The microcontroller sends commands and data through the SDI pin, receives commands and data through the SDO pin, and provides a clock signal through the CLK pin.

[0059] The main function of resistors R342, R343, R344, and R345 is current limiting. In debug mode, the FO3 / TEST pin can be connected to the ground terminal GND for easy software debugging.

[0060] The TXDCAN0, RXDCAN0, TXDCAN1, RXDCAN1, TXDCAN2, RXDCAN2, TXDCAN3 and RXDCAN3 pins of the CAN control chip U301 are mainly used for communication with the microcontroller.

[0061] The main function of resistors R307, R308, R309 and R310 is to ensure the matching and stability of data transmission.

[0062] like Figure 7 As shown, in some embodiments, the CAN communication module includes a CAN transceiver U704, a signal isolation module L706, a second resistor R725, and an eighth capacitor C719. The CAN transceiver U704 includes a first signal transmission pin, a CAN channel pin, a first sleep feedback pin, an enable pin, and a first wake-up pin. The first signal transmission pin, the CAN channel pin, and the first sleep feedback pin of the CAN transceiver U704 are respectively connected to the CAN control chip U301. The CAN channel pin of the CAN transceiver U704 is connected to the CAN bus of the controller under test through the signal isolation module L706. The first wake-up pin of the CAN transceiver U704 is connected to the first end of the eighth capacitor C719 and the first end of the second resistor R725. The second end of the second resistor R725 is connected to the power supply UB, and the second end of the eighth capacitor C719 is grounded.

[0063] The circuit design of the CAN communication module incorporates improvements such as signal isolation, terminating resistors, electrostatic discharge protection, sleep / wake-up control, and fault indication to enhance the CAN communication module's anti-interference capability, signal transmission quality, power consumption control, and fault diagnosis capability.

[0064] Specifically, the first signal transmission pins of the CAN transceiver U704 include the RXD pin and the TXD pin, the CAN channel pins include the CANL pin and the CANH pin, the first sleep feedback pin is the INH pin, the enable pin is the EN pin, and the first wake-up pin is the WAKE pin.

[0065] Furthermore, the CAN transceiver U704 also includes a power supply voltage pin and a reference voltage pin. The CAN communication module also includes a ninth capacitor C718 and a tenth capacitor C722. The power supply voltage pin is connected to the output of the second linear regulator LDO2 and the first terminal of the ninth capacitor C718, respectively. The reference voltage pin is connected to the output of the first linear regulator LDO1 and the first terminal of the tenth capacitor C722, respectively. The second terminals of both the ninth capacitor C718 and the tenth capacitor C722 are grounded. The power supply voltage pin and the reference voltage pin of the CAN transceiver are the VCC pin and the VIO pin, respectively. The CAN transceiver U704 uses the 5V second voltage converted by the second linear regulator LDO2 as the power supply voltage, connected to the VCC pin, and uses the 3.3V third voltage converted by the first linear regulator LDO1 as the power supply voltage, connected to the VIO pin. The ninth capacitor C718 and the tenth capacitor C722 mainly serve a filtering function.

[0066] The CAN transceiver U704 controls the power management devices in the circuit via the INH pin. In sleep mode, the INH pin of the CAN transceiver U704 is in a high-impedance state to reduce power consumption. When a wake-up mode is detected or a local wake-up request is input via the WAKE pin, the CAN transceiver U704 initiates a node start command by driving the INH pin high. The INH pin sends a signal to the master control module, instructing the power management device to enable power. Resistors R726 and R728 primarily limit current. When the EN pin is high, the CAN transceiver U704 enters normal operating mode, with both the driver and receiver enabled, allowing bidirectional CAN communication. When the EN pin is low, the device enters standby mode, disabling both the CAN driver and receiver, thus reducing power consumption. In standby mode, the INH pin remains in a high-impedance state, allowing other system components to continue operating.

[0067] The VIO pin of the CAN transceiver U704 provides power to the wake-up circuit, used to detect wake-up mode or remote wake-up requests. The TXD pin of the CAN transceiver U704 converts digital signals from the CAN controller into differential signals on the CAN bus. The RXD pin of the CAN transceiver U704 converts differential signals from the CAN bus into digital signals. The ERR pin of the CAN transceiver U704 indicates CAN communication and various fault states on the CAN bus. The VBAT pin of the CAN transceiver U704 is the power supply pin.

[0068] The main function of the second resistor R725 is current limiting, while the main functions of the eighth capacitors C719 and C723 are filtering.

[0069] The Split pin of the CAN transceiver U704 is used to implement CAN bus splitting connections, reducing signal reflection and distortion on the bus. The STB pin of the CAN transceiver U704 is mainly used for switching between standby and sleep modes. The CANH and CANL pins of the CAN transceiver U704 are used for the transmission of differential CAN message signals.

[0070] The L706 signal isolation module uses a common-mode choke, which is mainly used to suppress common-mode interference and improve signal integrity.

[0071] Resistors R732 and R733 are connected in series to form a terminating resistor, used to match the characteristic impedance of the transmission line to reduce signal reflection and transmission loss, ensuring effective signal transmission. Capacitors C720 and C721, and diode D706 primarily provide classic protection against damage caused by electrostatic discharge and other transient phenomena.

[0072] In this embodiment of the utility model, the CAN transceiver U704 supports sleep-wake-up tests for each channel, which can not only verify the messages sent by the controller under test, but also send corresponding messages to the controller under test to verify the controller under test's message receiving function.

[0073] like Figure 8As shown, in some embodiments, the LIN communication module includes a LIN communication chip U1201, a third resistor R1207, and an eleventh capacitor C1205. The LIN communication chip U1201 includes a second signal transmission pin, a LIN channel pin, a second sleep feedback pin, a first sleep control pin, and a second wake-up pin. The second signal transmission pin, the second sleep feedback pin, and the first sleep control pin of the LIN communication chip U1201 are respectively connected to the microcontroller. The LIN channel pin is connected to the LIN bus of the controller under test. The second wake-up pin is connected to the first end of the eleventh capacitor C1205 and the first end of the third resistor R1207. The second end of the third resistor R1207 is connected to the power supply UB. The second end of the eleventh capacitor C1205 is grounded.

[0074] The circuit design of the LIN communication module incorporates improvements such as sleep / wake-up control, fault indication, electrostatic protection, reverse connection protection, and terminating resistors to enhance the LIN communication module's anti-interference capability, power consumption control, fault diagnosis capability, and signal transmission quality.

[0075] Specifically, the second signal transmission pins of the LIN communication chip U1201 include the RXD pin and the TXD pin, the LIN channel pin is the LIN pin, the second sleep feedback pin is the INH pin, the first sleep control pin is the NSLP pin, and the second wake-up pin is the NWAKE pin.

[0076] The LIN communication detection module uses the power supply UB from the power module as its power supply voltage, which is connected to the BAT pin of the LIN communication chip U1201. Simultaneously, the BAT pin of the LIN communication chip U1201 also participates in the wake-up control process and has over-temperature and under-voltage protection functions to ensure the reliability and stability of the LIN communication chip U1201. The main function of capacitors C1203 and C1204 is filtering.

[0077] The RXD pin of the LIN communication chip U1201 is used to receive data, and the TXD pin is used to transmit data. When a message is received on the LIN bus, the RXD pin outputs a corresponding level signal. In normal mode, the RXD pin outputs a low level when a message is received on the LIN bus, and a high level when the LIN bus is in recessive mode. The microcontroller sends the message data to be transmitted to the LIN communication chip U1201 through the TXD pin. In normal mode, when the TXD pin is low, the LIN communication module sends message signals to the LIN bus through the LIN pin; when the TXD pin is high, the LIN pin stops sending message signals to the LIN bus.

[0078] The NWAKE pin of the LIN communication chip U1201 is its local wake-up input, used to wake up the LIN communication chip U1201 from sleep mode. The NWAKE pin is connected to the power supply UB through the third resistor R1207 and grounded through the eleventh capacitor C1205. When the NWAKE pin transitions from high to low and remains low for a period of time, the LIN communication chip U1201 will be woken up and enter standby mode. At this time, the RXD pin will output a low level, indicating a wake-up interrupt.

[0079] The NSLP pin of the LIN communication chip U1201 is its sleep control input, used to control the switching between sleep mode and normal mode. When the NSLP pin is set low and held for a period of time, the LIN communication chip U1201 enters sleep mode, where power consumption is extremely low, the TXD and RXD pins switch to a high impedance state, and the LIN bus is in a floating state. When the NSLP pin changes from low to high and holds for a period of time, the LIN communication chip U1201 exits sleep mode and enters normal mode, at which point message transmission via the LIN bus can proceed normally. The INH pin is the output of the power supply control command for the LIN communication chip U1201, used to control the power supply module to provide power output. When the LIN communication chip U1201 is remotely or locally woken up, the INH pin outputs a high level, instructing the power supply module to start supplying power to the LIN communication chip. When the LIN communication chip U1201 enters sleep mode, the INH pin outputs a low level, controlling the power supply module to stop supplying power to the LIN communication chip U1201, thereby reducing power consumption. The output current of the INH pin is limited, so resistor R1211 is added to limit the current. The eleventh capacitor C1205 primarily functions as a filter. Resistors R1206 and R1207 primarily function as current limiters. The LIN pin is responsible for transmitting and receiving message data between the LIN communication module and the LIN bus. A terminating resistor R1210 needs to be connected to the LIN bus to match the line impedance, reduce reflections, and improve signal transmission quality. Diode D1203 primarily functions as an electrostatic discharge protector, and diode D1202 primarily functions as a reverse polarity protector. Resistors R1208 and R1209 primarily function as current limiters.

[0080] Combination Figure 9 , Figure 10 and Figure 11As shown, in some embodiments, the Ethernet communication module includes an Ethernet communication chip U801B. The Ethernet communication chip U801B includes an Ethernet signal transmission pin, a cable connection pin, a third sleep feedback pin, and a third wake-up pin. The Ethernet signal transmission pin, the third sleep feedback pin, and the third wake-up pin of the Ethernet communication chip U801B are respectively connected to the microcontroller, and the cable connection pin of the Ethernet communication chip U801B is connected to the Ethernet cable interface.

[0081] Specifically, the Ethernet communication chip supports 100 Mbps Ethernet communication testing and fault code and packet loss rate testing. The main control module is primarily responsible for receiving and executing control commands and diagnosing and transmitting real-time operating data of the device. The corresponding Ethernet signal transmission pins include GPIOA_0, GPIOA_1, GPIOA_2, GPIOA_3, and GPIOB_0. The cable connection pins are MDIP and MDIN. The third sleep feedback pin is INH, and the third wake-up pin is WAKE.

[0082] By connecting the Ethernet communication chip U801B to the Ethernet cable interface via the cable connection pins, a stable connection to an external Ethernet network can be achieved, improving the compatibility and reliability of Ethernet communication.

[0083] The Ethernet signal transmission pin, the third sleep feedback pin, and the third wake-up pin of the Ethernet communication chip U801B are connected to the microcontroller. The microcontroller can put the Ethernet communication module into sleep mode and wake it up, thereby realizing the status control of Ethernet communication and reducing power consumption.

[0084] The Ethernet communication module adopts independent power supply circuits, filtering circuits, electrostatic protection, clock circuits, test / debugging interfaces, fault indicators, and other improvements to enhance its anti-interference capability, power consumption control, clock accuracy, test / debugging convenience, and fault diagnosis capability.

[0085] Specifically, the Ethernet communication chip U801B uses the main control module's power supply as its operating voltage, connected to the VBAT pin. Resistor R960 primarily functions as a current limiter. The GPIO_VDDIO1, GPIO_VDDIO2, GPIO_VDDIO3, and GPIO_VDDIO4 pins of the Ethernet communication chip U801B use a 3.3V third voltage converted by the power module as their power supply, providing power to the GPIO power pins and enabling digital signal input / output operations. The π-filter circuit composed of capacitors C903 and C901, and inductor L901, along with the parallel capacitors C902, C904, and C905, primarily function to filter and ensure a stable input from the power supply UB.

[0086] The U801B Ethernet communication chip includes 4 GPIOA, 2 GPIOB, and 5 GPIOC channels. It can be used as an input to receive external signals or as an output to send signals to the outside. The GPIOA_0, GPIOA_1, GPIOA_2, GPIOA_3, and GPIOB_0 pins are communication pins for communication with the microcontroller. Pulling GPIOA_3 and GPIOB_0 pins down to ground via resistors R939 and R938 can eliminate noise signals on the pins, thereby improving signal stability. Pins GPIOB_1, GPIOC_0, GPIOC_1, GPIOC_2, GPIOC_3, and GPIOC_4 are connected to the 3.3V third voltage converted by the power module via pull-up resistors R907, R908, R909, R910, R911, and R912. This ensures that the signal has a defined level, prevents signal fluctuation, enhances IO drive capability, ensures level matching, and also serves as a current limiter.

[0087] The U801B Ethernet communication chip allows setting the communication frequency via the SPISPD pin. Pulling it up to 3.3V via current-limiting resistor R906 ensures the pin remains high when not configured, preventing signal fluctuation. The BRDWUP pin is used to disconnect power-on and maintain this state until the next power-on, typically for hardware self-tests or clearing the chip's internal state. When the BRDWUP pin is connected to ground via current-limiting resistor R930, the disconnect-on function is active, placing the module in a disconnect-on state and maintaining it until the next power-on. The TAPSL0 and TAPSL1 pins are control pins for the Ethernet communication module's test access port, used to select the module's operating mode or access interface. Grounding the TAPSL0 and TAPSL1 pins via current-limiting resistors R928 and R929 indicates normal function mode. The RTT pin controls the output of a specific test mode, facilitating testing and debugging. The DISB pin is pulled up to 3.3V via current-limiting resistor R902, indicating normal data transmission.

[0088] The RESETB pin is the reset input pin of the Ethernet communication chip U801B. During normal operation, it is pulled up to 3.3V through a current-limiting resistor, maintaining a high level. When the RESETB pin is pulled low, the Ethernet communication module will perform a forced reset operation, restoring all circuits to their initial state. Capacitor C909 primarily filters and ensures voltage clamping. A 24KΩ (1%) pull-down resistor R942 is connected in series between RSET and ground to provide an accurate reference value for the internal bandgap reference voltage of the Ethernet communication chip U801B, ensuring the accuracy of the internal voltage. When the Ethernet communication module enters sleep mode, the INH pin is set low, thereby shutting down the output of the external voltage switching regulator and reducing the chip's power consumption. Resistor R925 primarily limits current. When the Ethernet enters sleep mode, a wake-up pulse signal can be sent to the WAKE pin to wake up the Ethernet communication module and enable it to send and receive message data. Resistor R926 primarily limits current. The SPI_VDDIO pin provides power to the digital I / O signals of the SPI master interface, including the chip select pin SPI_CSB, the clock signal pin SPI_SCK, the data input pin SPI_SI, and the data output pin SPI_SO. The π-filter circuit, composed of inductor L903, capacitors C931 and C932, prevents high-frequency interference signals from entering the circuit, reduces ripple, and provides a stable power supply input. The CKXTAL1 and CKXTAL2 pins are the clock input and feedback pins for the 25MHz crystal oscillator Y901, used to generate the internal clock signal. Resistors R927, capacitors C906 and C907 improve oscillation stability, reduce startup time, reduce noise, and improve circuit matching characteristics. The TESTA pin is connected to ground via current-limiting resistor R962 for debugging the Ethernet communication module. The seven MDIP and MDIN pins are used to connect the Ethernet cable for data transmission. The seven LED pins are used to indicate network connection status and communication status. When LEDs D901, D902, D903, D904, D905, D906, and D912 are lit, it indicates that the port is sending or receiving data. The main function of resistors R919, R920, R921, R922, R923, R924, and R961 is current limiting.

[0089] The CAN transceiver U704, LIN communication chip U1201, and Ethernet communication chip U801B of this invention are all equipped with corresponding sleep feedback pins and wake-up pins. Therefore, the microcontroller can control the corresponding communication chip to enter sleep mode and wake up according to the host computer's instructions. When the microcontroller receives a sleep command, it will enter sleep mode to reduce power consumption. Figure 12As shown, when a wake-up message is detected internally, the microcontroller controls the corresponding communication chip to wake up from sleep mode, and then reconfigures the corresponding communication module through the SPI pin to enter the communication test mode to perform testing. This enables independent testing of multiple communication methods, and by controlling the corresponding communication module to enter sleep mode when testing is not required, circuit power consumption can be reduced.

[0090] In one example, the communication test mode includes: control parameters → enter normal communication mode → message detection and verification → verification result feedback. Communication testing is achieved by controlling the communication of each communication module.

[0091] This utility model embodiment also provides a controller communication testing device, including the controller communication testing circuit as described in any of the above embodiments. The controller communication testing device can be used to test the communication function of an on-board controller.

[0092] The controller communication detection device includes a fixed panel and a circuit board for mounting and securing the circuit board. The circuit board is fixed in the middle of the entire fixture for easy heat dissipation. The controller communication detection circuit is mounted on the circuit board. The top and bottom sides of the fixed panel have communication interfaces, communication detection interfaces, and power supply interfaces. Fixing components are mounted on the left and right sides. The communication interfaces serve as the interface for receiving control commands and transmitting detection status data. The communication detection interfaces primarily handle message sending and receiving. The power supply interfaces are used to connect to an external power supply (UB) to power the device.

[0093] The device communication testing device of this utility model has a separate testing fixture, which can be used in conjunction with other testing modules or as a standalone testing system.

[0094] Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art can make various changes, substitutions and modifications to these embodiments without departing from the spirit and scope of protection of this utility model, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A controller communication detection circuit, characterized in that, include: CAN communication module, LIN communication module, Ethernet communication module, and main control module; The LIN communication module is connected to the main control module and is used to realize LIN communication between the main control module and the controller under test. The CAN communication module is connected to the main control module and is used to realize CAN communication between the main control module and the controller under test. The Ethernet communication module is connected to the main control module and is used to realize Ethernet communication between the main control module and the controller under test. The main control module is used to control the CAN communication module, the LIN communication module, and the Ethernet communication module to send test CAN communication messages, test LIN communication messages, and test Ethernet communication messages to the controller under test, respectively, and to receive response CAN communication messages, response LIN communication messages, and response Ethernet communication messages sent by the controller under test in response to the test CAN communication messages, the test LIN communication messages, and the test Ethernet communication messages, respectively, through the CAN communication module, the LIN communication module, and the Ethernet communication module.

2. The controller communication detection circuit according to claim 1, characterized in that, It also includes a power supply module, which comprises a step-down circuit, a first linear regulator, and a second linear regulator; The input terminal of the step-down circuit is connected to the power supply, and the output terminal of the step-down circuit is connected to the input terminals of the first linear regulator and the second linear regulator, respectively. The output terminal of the first linear regulator is connected to the main control module, the CAN communication module, the LIN communication module and the Ethernet communication module, respectively. The output terminal of the second linear regulator is connected to the main control module, the CAN communication module, the LIN communication module and the Ethernet communication module, respectively. The step-down circuit is used to convert the supply voltage of the power supply into a first voltage output; The first linear regulator is used to convert the first voltage into a third voltage output; The second linear regulator is used to convert the first voltage into a second voltage output, wherein the first voltage is greater than the second voltage, and the second voltage is greater than the third voltage.

3. The controller communication detection circuit according to claim 2, characterized in that, The main control module includes a microcontroller and a CAN control chip. The microcontroller is connected to the CAN control chip, the CAN communication module, the LIN communication module, and the Ethernet communication module, respectively. The CAN control chip is connected to the CAN communication module. The microcontroller is used to control the CAN communication module to send test CAN communication messages to the controller under test via the CAN control chip, and to receive response CAN communication messages sent by the controller under test. It also sends test LIN communication messages and test Ethernet communication messages to the controller under test via the LIN communication module and the Ethernet communication module, respectively, and receives response LIN communication messages and response Ethernet communication messages sent by the controller under test.

4. The controller communication detection circuit according to claim 3, characterized in that, The main control module further includes a first inductor, a second inductor, a first diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a parallel capacitor bank. The first end of the first inductor is connected to the power supply. The second end of the first inductor is connected to the positive terminal of the first diode, the BSTD1 pin of the CAN control chip, and the BSTD2 pin of the CAN control chip. The negative terminal of the first diode is connected to the first end of the first capacitor, the first end of the second capacitor, the first end of the third capacitor, and the first end of the second inductor. The second end of the second inductor is connected to the first end of the fourth capacitor, the first end of the parallel capacitor bank, the VS1 pin of the CAN control chip, and the VS2 pin of the CAN control chip. The second end of the first capacitor is connected to and grounded to the second end of the second capacitor, the second end of the third capacitor, the second end of the fourth capacitor, and the second end of the parallel capacitor bank.

5. The controller communication detection circuit according to claim 4, characterized in that, The main control module further includes a first resistor, a first transistor, a fifth capacitor, a sixth capacitor, and a seventh capacitor. The first end of the first resistor is connected to the cathode of the first diode, the first end of the fifth capacitor, and the VEXTIN pin of the CAN control chip. The second end of the fifth capacitor is grounded. The second end of the first resistor is connected to the emitter of the first transistor and the VEXTSH pin of the CAN control chip. The base of the first transistor is connected to the VEXTB pin of the CAN control chip. The collector of the first transistor is connected to the VEXTREF pin of the CAN control chip, the output of the first linear regulator, the first end of the sixth capacitor, and the first end of the seventh capacitor. The second ends of the sixth capacitor and the second ends of the seventh capacitor are connected and grounded.

6. The controller communication detection circuit according to claim 3, characterized in that, The CAN communication module includes a CAN transceiver, a signal isolation module, a second resistor, and an eighth capacitor. The CAN transceiver includes a first signal transmission pin, a CAN channel pin, a first sleep feedback pin, an enable pin, and a first wake-up pin. The first signal transmission pin, CAN channel pin, and first sleep feedback pin of the CAN transceiver are respectively connected to the CAN control chip. The CAN channel pin of the CAN transceiver is connected to the CAN bus of the controller under test through the signal isolation module. The first wake-up pin of the CAN transceiver is connected to the first end of the eighth capacitor and the first end of the second resistor. The second end of the second resistor is connected to the power supply. The second end of the eighth capacitor is grounded.

7. The controller communication detection circuit according to claim 6, characterized in that, The CAN transceiver also includes a power supply voltage pin and a reference voltage pin. The CAN communication module also includes a ninth capacitor and a tenth capacitor. The power supply voltage pin is connected to the output terminal of the second linear regulator and the first terminal of the ninth capacitor, respectively. The reference voltage pin is connected to the output terminal of the first linear regulator and the first terminal of the tenth capacitor, respectively. The second terminals of the ninth capacitor and the tenth capacitor are both grounded.

8. The controller communication detection circuit according to claim 3, characterized in that, The LIN communication module includes a LIN communication chip, a third resistor, and an eleventh capacitor. The LIN communication chip includes a second signal transmission pin, a LIN channel pin, a second sleep feedback pin, a first sleep control pin, and a second wake-up pin. The second signal transmission pin, the second sleep feedback pin, and the first sleep control pin of the LIN communication chip are respectively connected to the microcontroller. The LIN channel pin is connected to the LIN bus of the controller under test. The second wake-up pin is connected to the first end of the eleventh capacitor and the first end of the third resistor. The second end of the third resistor is connected to the power supply. The second end of the eleventh capacitor is grounded.

9. The controller communication detection circuit according to claim 3, characterized in that, The Ethernet communication module includes an Ethernet communication chip, which includes an Ethernet signal transmission pin, a cable connection pin, a third sleep feedback pin, and a third wake-up pin. The Ethernet signal transmission pin, the third sleep feedback pin, and the third wake-up pin of the Ethernet communication chip are respectively connected to the microcontroller, and the cable connection pin of the Ethernet communication chip is connected to an Ethernet cable interface.

10. A controller communication detection device, characterized in that, Includes the controller communication detection circuit as described in any one of claims 1 to 9.

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