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

[Anitha]

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?

[alister]

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

[alister]

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

[Anitha]

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.