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Original question:

TPS3600: TPS3600 to repalce MAX793 issue

TPS3600: WDI and /RESET pins

David Jin
Prodigy 40 points
Part Number: TPS3600

Further to the discussion of TPS3600D33PWR, I have a couple of questions as follows:

  1. In page 9 of datasheets, at watchdog section, it states "If the input is unconnected the watchdog is disabled and will be retriggered internally." . Can you elaborate this statement? Does it mean the user has to use this watchdog function, otherwise the chip will consume more current? What does "retriggered internally" mean anyway?
  2. Is the output /RESET pin open drain or push-pull? If it's a push-pull, should I use a diode when I connect to a open drain Reset in micro-controller?

Thanks.

  • 0
    TI__Mastermind 29670 points
    Hi David,
    1. The watchdog function can not be disabled/turned off. If the watchdog input is left floating, the device will create the stimulus, or transition, to the watchdog circuit block needed for the device to not create a false reset, as the watchdog timer is still operating.
    2. Push-pull. Can you clarify what open drain reset? I would think the reset (to the MCU) would be just a buffer?
  • 0 in reply to Marshall_Beck
    Prodigy 40 points

    Hi Marshall,

    Thank you for your prompt reply.

    1. You have clarified this item.
    2. Open drain reset means Reset circuit is an open drain. If micro-controller wants to reset the board (=0, open drain), but the /RESET from TPS3600 drives high (=1), then this will cause a contention. In this case, we need a diode to block it. Anyway, I know it's a push-pull circuit for /RESET. 

    David