Bus-off detection in TJA1043

[Sam23]

Dear Team,

Iam using TJA 1043 CAN transceiver, and I wanted to understand whether the transceiver can detect Bus-off in the following use case,
1. CANH open
2. CANL open
3. CANH and CANL open

Thanks

[Sam23]

Thanks David for the detailed information.

[diazmarin09]

Hello Sam,

I hope all is great with you. Thank you for using the NXP communities.

The TJA1043 can detect short circuits on the bus wires and signal them to the host microcontroller. While physical bus failures normally lead to interruption of bus communication, there are certain bus failures that are tolerated within the physical layer of high speed CAN.

The system fail-safe features of the TJA1043 aim to keep the impact of possible local failures, like pin short-circuits, confined to the corrupted node only. After detection of a local failure, appropriate measures are taken to keep the remaining bus operable as long as possible. There are protections against TXD Dominant Clamping, TXD/RXD Short Circuit and Bus Dominant Clamping.

Please review the document below for further information, specially the chapter 7.4.

AH1014 - Application Hints - Standalone high speed CAN transceiver

I hope this information helps.

Regards,

David