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Canbus without ground.

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dietert1:
As far as i understand DC-DC converters always add noise and cost.
And as far as i know a canbus node must not add > 10 pF onto CANL and CANH, so over-voltage protection isn't as simple as a TVS limiter. Over-voltage protection should be considered part of the bus, not part of the bus node.
Power over the bus will always be limited and should first serve as a supply to the isolated bus interfaces, while the canbus controllers in the nodes should get their supply elsewhere. That will reduce the cost of isolation to two opto-couplers per node - no need to design in special single chip isolation interfaces nor DC-DC isolators.

Regards, Dieter

Sived:
I cannot use a cable to distribute the power to the nodes.

I prefer adopt a canbus driver with isolation (as rounin, Dave, T3sl4co1l, nctnico and David Hess suggestions).

I will try to see the ADM3053 driver.
If you have any other driver to prompt me, thanks a lot.

Regards.

Sived

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