ISO1042: Isolating CAN BUS signals

Wong Zi Hao

Part Number: ISO1042

Tool/software:

Hi,

I need to isolate the CANH and CANL signals from my MCU. Below is a simple block diagram of the solution,

I have CANH and CANL coming in from my MCU, which then goes to the standard transceiver (CANH and CANL pins). Then, the Txd and Rxd pins of the transceiver will feed into the Txd and Rxd pins of the Isolated Can Transceiver. The output of the isolated CAN transceiver will be my isolated CAN Bus.

(RXD (Standard CAN Transceiver) → TXD (Isolated CAN Transceiver)
(TXD (Isolated CAN Transceiver) → RXD (Standard CAN Transceiver)

https://drive.google.com/file/d/1iug58vklvo6SRNAIleluG6XP4JGyevRT/view?usp=drive_link

Please refer to the image of the block diagram in the google drive file for clearer image. My question is will this work?

Regards,
Zi Hao.

5 months ago

0 Andrew J 5 months ago

TI__Mastermind 22835 points

Hello Zi Hao,

Thank you for reaching out and the clear problem description. Yes, this solution should work. Let me know if you have any further questions.

Best,
Andrew

0 Wong Zi Hao 5 months ago in reply to Andrew J

Prodigy 10 points

Hi Andrew,

From the TIDA Isolated CAN FD Repeater datasheet, it looks I need to have the bus arbitration logic circuit.

Do I need it in my case, between the CAN transceiver and the isolated CAN transeiver?

Best Regards,
Zi Hao.

0 Clemens Ladisch 5 months ago in reply to Wong Zi Hao

Guru 288030 points

Yes; to connect multiple CAN buses, you would need arbitration logic.

I am not aware of any MCU that has CANH/L I/Os. Is there another CAN transceiver in the box labelled "MCU"?

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ISO1042: Isolating CAN BUS signals