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TCAN2450-Q1: Q&A Watchdog use case

Taku Murayama
Intellectual 1830 points
Part Number: TCAN2450-Q1

Tool/software:

Hi,

Could you tell me what is the expected use case for Q&A watchdog? Do you have any recommended application?

BR,

Taku

  • 0
    TI__Guru 52492 points

    Hi Taku,

    The QA watchdog use case is the same as the other watchdogs - it is a way to ensure communication is maintained between controller and SBC. You may want to use QA watchdog instead of window or timeout because it requires the controller to answer a question correctly in a defined time period - which adds complexity that not only ensures that the communication link is there at timed intervals but also ensures that the controller is responding in an expected manner. 

    Ultimately - it just adds another layer to the test that makes the controller not only need to respond in a proper time period but also that the controller is sending expected data. For example if the controller has an issue in the data that it is sending but still can hit the timing requirements then the watchdog timeout and window watchdog may not detect that issue - however the QA watchdog could detect that the data on the link is wrong when using QA for watchdog. 

    Most applications don't specifically require QA watchdog to function - but it can add another layer of protection as the watchdog triggers have to be calculated at controller to properly answer the question. 

    Best,

    Parker Dodson