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TPS386000: WDT pins of TPS386000

Nidhi P Shetty
Intellectual 735 points
Part Number: TPS386000

Hello

I'm using TPS386000RGPR in my project.Is there any need to provide the clock output from the processor to WDI. What is the significance of WDI. Is there any requirement to provide 100k ohm pull up for all resets and WDO separately or whether we can use a single 100k ohm by shorting all these pins.

Please help me out in this concern.

Regards

Nidhi P Shetty

  • 0
    TI__Genius 12630 points
    Hi Nidhi,

    The WDI and WDO pins are the input and output pins responsible for watchdog (processor) monitoring. The watchdog input (WDI) must receive either a positive or negative logic edge before 610ms expires or else the watchdog output (WDO) will go active to logic low. The WDI typical interfaces to GPIO of a Microcontroller or processor and receives continuous pulses to suggest the microcontroller is operating correctly and has not turned off or got stuck in executing code.

    Yes, all outputs require a pull-up resistor for independent operation as these are open-drain outputs. You can use a single resistor to effectively logic OR the outputs together so that if any of the outputs goes active to logic low, they all pull down. If you want the outputs to work independently, then each must have its own pull-up resistor.

    When shorting the outputs together and using a single pull-up resistor, make sure the pull-up resistor value is sufficient to pull the outputs down to logic low while also not exceeding the current limit for any output pin.

    Please let me know if you have any additional questions. Thanks!

    -Michael
  • 0 in reply to Michael_DeSando
    Intellectual 735 points
    Hello

    Thank you for replying.
    If I don't want to use WDI functionality. Hence I don't want to provide any signal to WDI and hence can I give pull up for WDI and leave WDO unconnected?
    Or
    Can I leave both unconnected?

    Please help me out in this concern.

    Regards
    Nidhi P Shetty
  • 0 in reply to Nidhi P Shetty
    TI__Genius 12630 points
    Nidhi,

    We recommend connecting WDI to GND and leave WDO floating if not using the watchdog at all. You can also leave both disconnected.

    -Michael