Introduction to the physical layer (transceiver) of the LIN bus protocol

The LIN bus protocol specifies the function of its physical layer transceiver, which is to convert the TTL/CMOS level signals of TX and RX output by the MCU SCI serial communication module into the dominant and recessive levels of the LIN bus. This design improves the anti-interference threshold of signal transmission during communication and ensures that the LIN bus can still work normally in a strong interference automotive electronic environment. In addition, the LIN bus protocol also specifies the terminal circuit design requirements of the LIN Master and Slave nodes, including pull-up resistors, anti-reverse diodes and load capacitors.