What is the solution for isolating differential CAN signals coming out of a non isolated CAN transceiver?
Typically isolation would be implemented on the logic side of a non-isolated CAN transceiver rather than the bus side. Is there a particular requirement to implement isolation on the bus side (CANH and CANL) in this case?
One option might be to connect some form of CAN physical layer repeater with isolation, i.e. two CAN transceivers (one with integrated isolation of the logic interface), with the logic I/O connected back to back.
How is the isolated power supply to be provided? We have three options at present for isolated CAN transceivers:
ADM3053 has an integrated DC/DC converter to power the bus side of the device from power supply on the logic side of the isolation barrier.
ADM3052 is suitable for applications where there is power on the bus, e.g. DeviceNet, as the part includes an integrated LDO to power the bus side of the part from a 24V supply input.
ADM3054 is suitable for applications where an isolated supply is generated on-board already, separate supplies are required on each side of the device.
Thanks for the solution. Yes we have a requirement to isolate the CAN on the bus side. We will implement the suggested solution & update you on the results.
Do we have an automotive grade part available in ADM3054?
We do not currently have an automotive grade part for the ADM3054.
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