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Anitha
Anitha
Associate III
March 12, 2021
Question

Is it necessary to use 2 watchdog timers for class B compliance?

  • March 12, 2021
  • 3 replies
  • 964 views

In the ST STL library (en.x-cube-classb-v2-3-0) they have used both watchdog timers. Is it necessary to use both watchdog timers(IWDG and WWDG) for class B compliance?

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3 replies

alister
alister
Senior III
March 13, 2021

Two watchdogs alone won't make a product safe, and used improperly could make it extremely unsafe.

Anitha
AnithaAuthor
Associate III
March 15, 2021

But in en.x-cube-classb-v2-3-0 package (STL library solution) enabled both IWDG and WWDG and used too. In STM32xx_STLmain.c file contains these details in

Check Safety routines Control flow and Refresh Window and independent watchdogs section.

alister
alister
Senior III
March 13, 2021

Find AN3307 at https://www.st.com/content/st_com/en/search.html.

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