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I can see there is 50 mΩ in LIN bus with LIN ICs. But I don't understand why it is there.

Does anyone have an idea why I see 50 mΩ in the bus line?

Velvel
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sangraemelb
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1 Answers1

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This is almost certainly used as a current sensing resistor for LIN's Bus Shunt Method (BSM) of node position detection (NPD), also known as autoaddressing. This method allows a device to detect if it is the last device on the bus, even if it doesn't have an address assigned to it already.

Polynomial
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  • Thank, it is definitely for Bus Shunt Method (BSM) even if I cannot check all circuits. I can simply check why there is a shunt from this link as well. https://en.wikipedia.org/wiki/Local_Interconnect_Network – sangraemelb Feb 07 '23 at 22:14