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Power control(on off) using Watchdog

Kevin Lee5
Intellectual 705 points

Hello,

I want to control the system power using the Watchdog IC.

I haven't decided which Watchdog IC to use yet.

This is the block diagram of my project.

As I check, It would work properly after power on reset.

However, the reset level will be changed "Low(lower than Threshold voltage) to High(higher than Threshold voltage)".

It means that it can't turn power on after power is applied.

Do you recommend any solution to resolve this problem?

Thanks in advance.

Kevin

  • 0
    TI__Mastermind 18690 points

    Hi Kevin,

    I'll be happy to help. For the watchdog application, are you looking for a timeout watchdog or a window watchdog? Also in your diagram at what voltage threshold would you want the RESET to de-assert? 

    Kevin Lee5 said:
    However, the reset level will be changed "Low(lower than Threshold voltage) to High(higher than Threshold voltage)".

    Just to confirm, from your statement above, you want an undervoltage supervisor that asserts reset LOW when VDD is below threshold and de-assert HIGH when VDD is threshold + hysteresis? 

    If that is the case then how much hysteresis is needed for your application?

    Jesse  

  • 0 in reply to Jesse Villanueva
    Intellectual 705 points

    Hi Jesse,

    Thanks for your feedback.

    I want to close this issue for my misunderstanding ^^