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Graduate
October 15, 2025
Solved

What is the 0R in front of the resistors

  • October 15, 2025
  • 3 replies
  • 816 views

CAN transceiver Hardware.png

Can someone please help me find the value of 0R, as I am trying to use the CAN FD, but I am not able to figure out the values of the resistor.

    This topic has been closed for replies.
    Best answer by mƎALLEm

    Hello @Nimai_Singhal and welcome to the community,

    1- This is not a ST product. You need to ask NXP for that. 0R = 0ohm. It's just a solder bridge.

    2- TJA1050 is not intended to be used in CAN-FD mode i.e. > 1Mb/s. From the datasheet:

    mALLEm_0-1760515324756.png

    If you are using STM32 having FDCAN interface, you can use it only in Classic mode.

     

    3 replies

    Super User
    October 15, 2025

    0R means 0 Ohms. It's just a jumper--no resistance.

     

    Graduate
    October 15, 2025

    Thank you so much.

    ST Employee
    October 15, 2025

    Hello,

    To protect this CAN transceiver against ESD and EOS, you can add ESDCAN04-2BLY or ESDCAN04-2BWY on CANH and CANL, as close as possible to P2 connector. Layout is important for ESD protection devices, you can find layout tips on AN5686.

    Best regards.

    Fabrice.

     

    Graduate
    October 15, 2025

    Thank you so much,
    I will definitely keep this in mind while creating my CAN-FD.

    mƎALLEmAnswer
    Technical Moderator
    October 15, 2025

    Hello @Nimai_Singhal and welcome to the community,

    1- This is not a ST product. You need to ask NXP for that. 0R = 0ohm. It's just a solder bridge.

    2- TJA1050 is not intended to be used in CAN-FD mode i.e. > 1Mb/s. From the datasheet:

    mALLEm_0-1760515324756.png

    If you are using STM32 having FDCAN interface, you can use it only in Classic mode.

     

    Graduate
    October 15, 2025

    Thank you so much.

    Can you recommend some chips that may be good for CAN-FD purposes?

    Technical Moderator
    October 15, 2025

    @Nimai_Singhal 

    No need to post several posts. You can Tag everyone here using @ and say what you want in the same post.


    @Nimai_Singhal wrote:

    Thank you so much.

    Can you recommend some chips that may be good for CAN-FD purposes?


    That depends on the bitrate you will be using in the data phase.

    MCP2562FD could reach 8Mb/s. It's already used on STM32H743I-EVAL board:

    mALLEm_0-1760529066458.png

     

    You can refer to this article: STM32 FDCAN running at 8 Mb/s on NUCLEO boards

    Hope that helps.