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TPS65381A-Q1: synchronizing the MCU with watchdog

Zhanghe Nan
Prodigy 50 points
Part Number: TPS65381A-Q1

From the 5.4.13 sector, is it true that synchronizing  the MCU with watchdog sequence can be performed anytime, not only at the moment when MCU timer start. ?

 

BYD said there are fault reported when they synchronize the MCu with watchdog not at the moment when MCU timer start.

 

 

 

 

cid:image003.png@01D3F885.09D81010

 

  • 0
    TI__Mastermind 20590 points

    Yes, you can re-synchronize and must if for some reason the MCU becomes unsynchronized.  However, depending on the WD_FAIL_CNT when the MCU determines it is not synchronized it may not have enough time or chances to re-synchronize before WD_FAIL_CNT reaches 7+1 and RESET state occurs if WD_RST_EN = 1. 

    In a normally running system the MCU is synchronized with the watchdog in the TPS65381A-Q1 during the boot process of the MCU while the TPS65381A-Q1 is in DIAGNSOTIC state and when the MCU runs properly they will remain synchronized.   

    Best Regards,

    Scott