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Isolated CAN ground connection

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Jeroen3:
I'm a bit rusty on the bit-timings of CAN bus and I never gave it much thought, but does the delay in the isolator reduce the maximum bus length?

Dave:

--- Quote from: Jeroen3 on September 06, 2019, 05:43:49 am ---I'm a bit rusty on the bit-timings of CAN bus and I never gave it much thought, but does the delay in the isolator reduce the maximum bus length?

--- End quote ---
CiA 301 (page 23) states that bus lengths are based on an estimate of 5ns/m propagation delay. So yes, the response time of the isolator should reduce the maximum usable bus length.

The isolators supposedly have a 9ns delay in one direction (Si841x/2x - the ones I used in my design), so that should reduce the maximum bus length by just over 7m (communication between two isolated devices).

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