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Associate
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.

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

TDK
Super User
October 15, 2025

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

 

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Associate
October 15, 2025

Thank you so much.

FGUIT
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.

 

Associate
October 15, 2025

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

mƎALLEm
mƎALLEmBest answer
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.

 

"To give better visibility on the answered topics, please click on ""Accept as Solution"" on the reply which solved your issue or answered your question."
Associate
October 15, 2025

Thank you so much.

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

mƎALLEm
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.
 

"To give better visibility on the answered topics, please click on ""Accept as Solution"" on the reply which solved your issue or answered your question."