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LIN bus fundamentals

LIN bus fundamentals: LIN is a low-cost single-wire master-scheduled network and LIN 2.x has a maximum data rate of 20 kbit/s. The page also includes a worked example and measurement sequence.

6 concrete technical facts1 worked example3 sources

Technical frame

LIN bus fundamentals: LIN is a low-cost single-wire master-scheduled network and LIN 2.x has a maximum data rate of 20 kbit/s. The page also includes a worked example and measurement sequence.

The technical values here expose the standard, protocol or physical relationship directly; model-specific service values are linked through the matching model/variant dossier.

The goal is not only to define the term but to let the reader calculate and interpret what the data means in a scan, scope or physical test.

Concrete technical facts

  • LIN is a low-cost single-wire master-scheduled network and LIN 2.x has a maximum data rate of 20 kbit/s.
  • The master sends the header and the addressed slave sends the response field.
  • A frame includes a Protected Identifier (PID), data and checksum.
  • Enhanced checksum includes the PID while classic checksum remains defined for certain frame types.
  • LIN dominant/recessive levels are referenced to vehicle supply and should not be interpreted like differential CAN.
  • If a slave does not respond, power/ground, wake-up, schedule table and PID matching are separate checks.

Worked example

  • Timing example: at 20 kbit/s one bit is about 50 µs, which gives a practical oscilloscope time-base starting point for edge and delay checks.

Measurement and verification sequence

  • Observe idle and dominant levels with a scope.
  • Confirm that the master header is present.
  • Check whether the slave response follows the PID.
  • Verify supply, ground and wake-up conditions.

Fault-separation logic

  • Is a valid command present and are power/ground/network healthy?
  • Does feedback follow the command?
  • Does an independent physical measurement confirm the output?
  • Is the fault limited to a specific temperature/load/speed condition?
  • Does the result remain stable when the original condition is repeated after repair?

Technical sources

  1. CAN in Automation technical knowledge
  2. Otodünyam teknik editoryal bilgi mimarisi
  3. ISO standards catalogue · road vehicles

Continue investigating

Model-specific real technical data · Measurement references · Technical diagnostic atlas