SLLA383A February   2018  – August 2022 SN65HVDA100-Q1 , SN65HVDA195-Q1 , TLIN1022-Q1 , TLIN1029-Q1 , TLIN2022-Q1 , TLIN2029-Q1 , TMS320F28P550SJ , TMS320F28P559SJ-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 LIN Specification Progression
    2. 1.2 Workflow Concept
  4. 2Network Architecture
    1. 2.1 General Layout of the LIN Bus
    2. 2.2 Serial Communication Principles
    3. 2.3 Commander-Responder Principle
    4. 2.4 Message Frame Format
  5. 3Physical Layer Requirements
    1. 3.1 Bus Signaling Fundamentals
    2. 3.2 Pullup Values
    3. 3.3 Threshold Values
    4. 3.4 Bit-Rate Tolerance and Timing Requirements
    5. 3.5 Synchronization and Bit Sampling
    6. 3.6 Duty Cycle
  6. 4Filtering, Distance Limitations, Nodes on Bus
    1. 4.1 EMI and Signal Conditioning
    2. 4.2 ESD and Transients
    3. 4.3 Distance and Node Limitations
  7. 5LIN Transceiver Special Functions
    1. 5.1 Low-Power Modes
      1. 5.1.1 Sleep Mode
      2. 5.1.2 Standby Mode
    2. 5.2 Wakeup
      1. 5.2.1 Pin Wakeup
      2. 5.2.2 LIN Wakeup
      3. 5.2.3 Dominant Timeout
  8. 6Advantages and Disadvantages
  9. 7Conclusion
  10. 8Revision History

2.2 Serial Communication Principles

The SCI is the dominant interface used between LIN transceivers and the microcontrollers that communicate with them. Originally UART was used, but fault-free interface through UART is known to be difficult to achieve.

The microcontroller transmits bit frames, starting with the dominant start bit. This synchronizes all receivers on the bus, followed by the least significant bit to most significant bit, then a stop bit. This constitutes one SCI frame, and a LIN message is composed of multiple SCI frames.