TJA1050, CAN loss

Carl_5 — Thu, 02 Jul 2026 02:08:55 GMT

Hello,

We have a product used TJA1050 used TJA1050, the schematic is as below.

We found there is a high-frequency CAN loss during the test. Lost one or two frames in operation.

The busload is around 16%.

I attached the HW schematic and CAN loss data below.

Question

1. What's the possibly root cause of the CAN loss?

2. Is there any issue about the HW schematic?

3. What action I can do in the next step

I can try more test or provide more information if necessary. Thank you for your support.

Re: TJA1050, CAN loss

guoweisun — Thu, 02 Jul 2026 06:23:06 GMT

1:If this board of yours is not at the end of the bus, it is recommended to disconnect DR6/DR7 first or change it to an optional jumper

2: For test purpose please remove DR8/DR9/DD1/DD2

3:Whether the data rate and propagation delay of the isolator SI8421 satisfy the CAN bit timing margin