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TCAN1042HV-Q1: Bus Fault protection ±70 V condition

Kevin Huang8
Genius 4465 points
Part Number: TCAN1042HV-Q1
Other Parts Discussed in Thread: TCAN1042H

Hi Team,

When I add 60V voltage from the CANH and CANL pins, it will burn out. What is the test protection conditions for ±70V?

  • 0
    TI__Guru 74252 points

    Kevin,

    Are you applying the voltage to each CANH and CANL relative to GND? The device should survive up to 70V from CANH to GND or CANL to GND indefinitely.

    Regards,

    Eric Hackett 

  • 0 in reply to Eric Hackett
    TI__Genius 11485 points

    Hi Eric,

    Yes, we apply  the voltage to each CANH and CANL relative to GND. 

    May I clarify the correct set up for this 70V bus fault test. 

    1. do we need to power on the TCAN1042H ?

    2. Do we need give "H" or "L" level to TXD pin 

  • +1 in reply to PYTsai
    TI__Guru 74252 points

    PY,

    The device shouldn't need to be powered on for the 70V protection to work. And the state of the TXD pin shouldn't matter. As an experiment, can you try with the power on? And can you also capture the voltage on the pin as the power supply is turned on with an oscilloscope? I'm curious if there is a voltage spike initially that goes over 60V before settling, and maybe this is causing some damage.

    Regards,

    Eric Hackett 

  • +1 in reply to Eric Hackett
    TI__Genius 11485 points

    Hi Eric,

    Thanks for your support, we found the root cause. Customer had mounted the wrong device. It is not TCAN1042H