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TPS3852: Difference between TPS3852 and TPS3851

Dylan You
Intellectual 2630 points
Part Number: TPS3852
Other Parts Discussed in Thread: TPS3851

Dear Teams,

My customer wants to change from TPS3851 to TPS3852. However, they found that TPS3852 actually is a window watchdog timer, while TPS3851 is an independent watchdog timer. Refer to 8.1.1.2 on TPS3851 and TPS3852 datasheet, they need to adjust their code on programming to set not only the upper boundary of watchdog, but also the lower boundary. Did I understood the difference between TPS3851 and TPS3852 correct? 

Thus, customer not necessary to change their hardware design circuit due to TPS3851 and TPS3852 are P2P. But, they need to re-program it, am I right?

Could you help tell us are there any other difference between TPS3851 and TPS3852?

Thanks!

Dylan

  • 0
    TI__Intellectual 2630 points

    Dear Teams,

    Also, my customer is wondering that whether it has any bad effects if they feed dogs outside the window watchdog range? If they feed dogs with 1sec interval continuously, are there any bad effects?

    Thanks!

    Dylan

  • 0 in reply to Dylan You
    TI__Intellectual 2630 points

    For example, the window is between 5-10s. The firmware will feed the dog with time interval 1s. Then, whether the dog feeding before the 5s window causing reset directly because it is outside of window?

  • 0 in reply to Dylan You
    TI__Intellectual 1735 points

    Hi Dylan,

    Thanks for providing additional details to your concern.

    I am looking into this and I will get back to you shortly. 

    -Tony

  • 0
    TI__Intellectual 1735 points

    Hi Dylan,

    The TPS3852 will work in this case given a few things. The TPS3852 has just the 3.3V monitored voltage option, so they should be what they are monitoring.

    You are correct about the lower and upper boundaries. They will need to program the TPS, which will mean setting the boundaries according to this table: 

    This may mean populating resistors.

    I am unsure of what exactly you are saying with respect to feeding the dog. If you are talking about a canine, it might be worth consulting a veterinarian. If you are talking about the TPS3852, what events/waveforms are happening at which pins?

    -Tony

  • 0 in reply to Tony!
    TI__Intellectual 2630 points

    Hi Tony,

    Anyway, thanks a lot for your help!

    I know my English writing capability might not as good as other native speaker or even other non-native English speaker. I just feel shame of the way you talked with your colleagues. You and me both knows what we are referring, while you just want to make some funny jokes you think it is funny. 

    If there are any miscommunication between me and you, I am sorry about that.

    Thanks!

    Dylan

  • +1 in reply to Dylan You
    TI__Mastermind 28505 points

    Hi Dylan,

    Let me help you with your question.  The difference between the TPS3851 and TPS3852 is exactly what you mentioned.  One is a window watchdog and the other is just a upper bounded watchdog.

    If the "kick" signal or feeding the dog is outside the window, then /WDO will go low.  There will be no bad effects.  If the kick signal is too early, then an early fault will occur as well.  The kick signal must occur within the window for proper operation.  See below:

    Let me know if you have further questions.  

    Ben

  • 0 in reply to Ben C
    TI__Intellectual 2630 points

    Hi Ben,

    Thanks a lot for your detail explanation on my concern! It really resolve my customer question. 

    Thanks!

    Dylan

  • 0 in reply to Dylan You
    TI__Mastermind 28505 points

    Hi Dylan,

    No problem!  Glad to be of help!  Good luck to you! :-)

    Ben