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TCAN2451-Q1: RSTN stuck to high

Daniel Wang (auto)
Expert 3500 points
Part Number: TCAN2451-Q1

Tool/software:

Hello team,

If the RSTN stuck to high, what is the reaction for this device? I cannot find this in the datasheet.

Thanks!

Regards,

Daniel Wang

  • 0
    TI__Guru 52172 points

    Hi Daniel,

    Who is your customer- I am asking because I have the same exact question from a direct question on E2E from a customer and I want to see if this is the same group asking the question so we don't have multiple threads on the same topic. 

    In case this is for a different customer please see below:

    If the nRST is high then the device won't restart when the nRST pin is asserted low. 

    The device only drives nRST low when the device is in restart mode - so if devices downstream rely on the output low signal from this pin during restart mode they won't see the signal. 

    Ultimately - if the nRST is stuck high -the restart functionality cannot be accessed through the nRST pin but most other device operation should be okay if only nRST pin is impacted. 

    Best,

    Parker Dodson 

  • 0 in reply to Parker Dodson
    TI__Expert 3500 points

    Hello Parker,

    My customer is Conti, I am not sure if they posted this question in E2E already, I will share the reply with them.

    Thanks!

    Regards,

    Daniel Wang

  • 0 in reply to Daniel Wang (auto)
    TI__Guru 52172 points

    Hi Daniel,

    I missed a detail in my last reply - the watchdog timer may not start correctly which could cause the device state machine and modes to become unreliable. This is because the t_initWD timer starts at the low to high transition of the nRST pin - so if the device can't control that FET there could be unexpected behavior depending on how the watchdog is configured. 

    Best,

    Parker Dodson