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TPS3435-Q1: Watchdog Startup Delay = 0 sec

Roy Levkovitch
Prodigy 10 points
Part Number: TPS3435-Q1

Hi,

I don't understand part behaviour when selecting a device with Watchdog Startup Delay (Tsd) equals to No delay (A or G options).

As I understand, every power up (after Tstrt which is max of 500us) and after WDO deasserts, the part needs to get immidiate pulse on WDI or it will asserts WDO again.

Meaning, I'm in a loop of WDO reset to my MCU because i have no time to boot.

What am I missing here?

how much time for boot does mu MCU have after Power up or after WDO event (Deassertion of WDO)?

thanks,

Roy.

  • 0
    TI__Genius 9045 points

    Hello Roy,

    Tsd option A = No delay for start up and the output pin WDO is Open Drain Active Low outputs

    Tsd option G = No delay for start up and the output pin WDO is Push Pull Active Low outputs

    For Tsd = No delay option, the first WDI pulse can be provided anytime between WDO deassert to tWD timer elapse. i.e. if tWD = 100 msec, user can provide WDI pulse before 100 msec after WDO de assert.

    User needs to select tWD time such that it is higher than MCU boot time.

    This is where the tSD is useful. Select tSD option larger than MCU boot time. Once MCU boot complete user can provide WDI pulse and enter watchdog monitoring frame.

    Thanks & regards,

    Shridhar.