The function of the can transceiver is to convert the data supplied by the can regulator into an electrical signal, and then send it out through the data bus. At the same time, it also receives the bus data and transmits the data to the can regulator. The function of the vehicle CAN transceiver is to convert the data supplied by the CAN regulator into an electrical signal, and then send it out through the data bus. The function of the CAN transceiver in the vehicle network is to convert the data provided by the CAN regulator into an electrical signal and then send it out through the data bus. At the same time, it also receives bus data and transmits the data to the CAN regulator. Vehicle Network CAN transceiver is a monolithic integrated circuit that integrates a CAN data transmitter and a data receiver. The types of CAN transceivers for automotive in-vehicle networks also include independent and combined CAN transceivers. The CAN transceiver has the function of "listening while talking (sending and receiving at the same time)" and "signal conversion (conversion of digital signal to bus voltage signal)". The CAN transceiver is used to receive data from the CAN controller and send it to the CAN data transfer bus, while the CAN transceiver also receives data from the CAN data bus and passes it to the CA0,CANH and CANL output waveform is consistent with... '>STM32 MCU CAN communication,CAN controller using TJA1050,CANH and CANL output waveform is consistent. The CAN bus is connected to the physical bus through the two output terminals CANH and CANL on the CAN controller interface chip can transceiver chip , while the CANH terminal can only be in a high level or suspended state CAN transceiver chip , CANL end can onlyIs low or suspended state. If the pen is OK, it should be pin-to-ground or the capacitance between pins is too large. TJA1050 Vref is the output reference voltage, and the voltage value is 5V. The specification suggests that this pin is suspended, and the reference circuit this pin is also suspended. CAN bus communication hardware schematic (using TJA1050T CAN bus driver) F040 built-in CAN bus protocol controller, as long as the external bus driver chip and appropriate anti-interference circuit CAN be easily establishedBus intelligent measurement and control node. TJA1050T CAN bus driver of PHILIP company is used in this design. The hardware principle diagram of CAN bus communication is shown in Figure 3. Seamless bus connection innovation In the past, CAN controllers were connected to the CAN bus via discrete circuits, but modern CAN transceivers have taken over this task, providing a more convenient interface to the can transceiver chip. The heart of the CAN transceiver lies in its two key pins, CANH and CANL, which correspond to the high and low levels of the bus respectivelyFlat signal. 1, the complete CAN circuit is composed of a CAN controller and a CAN transceiver, and the two are generally connected by TTL level transceiver signals (CANRX, CANTX). The CANTX TTL signal is converted to CAN-standardized differential signal output (CANH, CANL) by the CAN transceiver, and the actual signal on the differential line is received and converted into TTL signal output to CANRX pin on. 2, the CAN controller receives data from the microprocessor in the control unit, processes the data and passes it to the CAN transceiver. CAN transceiver data is sent to the bus or received from the bus to the controller. A transceiver can also be called a driver. 2, more importantly, the CAN controller is the protocol base layer and data link layer that implements the CAN bus, generates a complete CAN frame and sends it to the CAN transceiver in binary stream. 3, CAN transceiver is a key component in the vehicle network, the main task is to perform data conversion and transmission. It is responsible forThe information provided by the CAN controller is converted into an electrical signal and sent through the data bus. At the same time, the data from the bus is received and processed for transmission to the CAN controller. It CAN be said that the CAN transceiver is the bridge connecting the CAN controller and the bus communication, and is the core component to realize the data transmission of the vehicle network. Receiving pin (CANRX). CAN control the components of the chip. CAN, Controller Local Area network (Controller Area Network, CAN) for short, is developed by the research and development and production of automotive electronic products known as the German BOSCH company, and eventually became the international standard (ISO11898). CANTX and CANRX are the transmit pins (CANTX) and receive pins (CANRX) of the CAN control chip. The complete CAN circuit is composed of a CAN controller and a CAN transceiver, which are generally connected through TTL level transceiver signals (CANRX, CANTX). CAN is a serial bus, dataCommunication only requires two lines. CAN communication module is integrated in the chip. The system uses CAN bus to achieve the transmission of display information, sharing the information processed by other modules on the car, making the car simple wiring, reliable transmission and display information, small size of the instrument, strong system expansion ability, good real-time, high accuracy, comprehensive and intuitive display information. Key words: CAN bus; Appearance; At present, automotive instruments are undergoing a transition period from the third generation to the fourth generation. Obviously, we generally use an external CAN bus driver 82C250. Its input TX, the output RX, is unipolar. At this time, the TX0/TX1 or RX0/RX1 pins of the SJA1000 should be the same, but because the internal circuit design of TX1 and RX1 gives other functions, only TX0 and RX0 are connected to the 82C250 driver. What is the difference between a CAN controller and a CAN transceiver?
What is the use of a car CAN pin?