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TCAN2451-Q1: When the SBC has gone into fail-safe mode, whether the HSSx will keep output status?

Shiyu Xia
Prodigy 130 points
Part Number: TCAN2451-Q1

Tool/software:

Q1. When the SBC has gone into fail-safe mode, whether the HSSx will keep output status? 

Q2. From datasheet, in Fail-Safe Mode, HSSx=SBC Fault dependent. How to understand "SBC Fault dependent"?

  • 0
    TI__Mastermind 33805 points

    Hi Shiyu,

    We are currently on holiday. 
    Please help give our experts until next week for feedback, thanks. 

    Best Regards,

    Michael. 

  • 0
    TI__Mastermind 46987 points

    Hi Shiyu,

    I apologize for the delay here on our side due to the US holiday. 

    For your questions:

    1. HSSx is off in Fail-safe mode - there is one exception and that is HSS4 if the system is setup for cyclic sensing wake then HSS4 will be used for cyclic sensing wake along with programed WAKEx pin. So every other function of HSSx is turned off in Fail-safe mode. 

    2. How you need to interpret the "SBC Fault Dependent" line in the picture you attached is as follows - only HSS4 can be active during Fail-safe mode and it can only support cyclic sensing wake - however the HSSx block will shut off if it detects a sustained overcurrent fault through the HSS - so if HSS4 has shutoff due to the fault - then not even HSS4 in cyclic sensing wake will work properly.

    I have talked to our systems engineer on this part because I also found the phrasing around the HSS block in fail-safe mode a bit confusing in the datasheet here so that will updated to be more clear in future updates of datasheet. 

    Best,

    Parker Dodson