• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 62 subscribers
  • Views 383 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS386000: Individual start-up delay for WDT

Marcus Müller
Prodigy 260 points
Part Number: TPS386000
Other Parts Discussed in Thread: TPS3431, TPS3430, TPS3840

Hi!

Is it possible to somehow have an individual start up delay for TPS386000 watch dog timer while still using all 4 channels for voltage supervision?

The 600ms polling window for the WDT (after the start up) is not long enough for the processor to boot up and send a signal to WDI.

Do you have a suggestion how to accomplish that?

Thanks a lot!
Marcus

  • 0
    TI__Genius 12630 points

    Marcus,

    There is no way to have the device monitoring on /RESET1 while the WDT is delayed. The best solution I think is to either have /MR pulled low during start up or /RESET1 delayed using CT1, forcing /RESET1 output low and the WDT disabled. Then when ready bring /MR back up high and the WDT will begin operation as normal and SENSE1 will begin monitoring as normal. Note: as long as /RESET1 is low, the WDT is disabled.

    Will this work for your application? Another solution may be to use a separate programmable watchdog device with watchdog disable and programmable timeout such as TPS3430, TPS3431.

    Please let me know if these recommendations work for your application

  • 0 in reply to Michael_DeSando
    TI__Prodigy 260 points

    Thank you Michael for the quick response!

    We'll check what the best option is then for this particular application. In addition to using an external WDT, also an additional voltage supervisor like TPS3840 might be a good option.

    Best regards,

    Marcus