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Original question:

TCAN1145-Q1: CANH and CANL short to GND detection

TCAN1145-Q1: CANH or CANL shorted to Vbat or GND Device Operation

Cameron Hagg
Expert 4155 points

Part Number: TCAN1145-Q1

Tool/software:

Hi TRX Team,

I was reviewing the e2e thread here: TCAN1145-Q1: CANH and CANL short to GND detection - Interface forum - Interface - TI E2E support forums because my customer has a similar question - How does TCAN1145-Q1 operate in the following conditions:

Can you please confirm my understanding below, especially the bolded questions.

CANH shorted to Vbat -> Device will continue transmitting data, but may be at a slower data rate. Any other way to detect from the TCAN1145-Q1?

CANL shorted to Vbat ->Complete communication failure. Device enters fail-safe mode? Any other way to detect from the TCAN1145-Q1?

CANL shorted to GND -> Device will continue transmitting data, but may be at a slower data rate. Any other way to detect from the TCAN1145-Q1?

CANH shorted to GND-> Complete communication failure. Device enters fail-safe mode? Any other way to detect from the TCAN1145-Q1?

Thanks for your help

Cameron Hagg

  • +1
    TI__Mastermind 31880 points

    Hi Cameron,

    Please refer to the functional safety document of TCAN1145, for CANL short to VBAT and CANH short to GND scenarios, normal communicating is not possible but it won't enter fail-safe mode. 0x54 register will issue an corresponding interrupt to those bus faults.

    Regards,

    Sean