STM32G474RE Startup Issue

[DKlew.1]

Hi everyone,

I have a hardware problem with STM32G474RE on startup. If I try to supply this MCU directly from the lab power supply, it runs correctly, but when I have dips or drops or fast switching on the supply, I notice that the MCU doesn't start. I measured time when it's ok and it looked like 100ms - for me it's too long. Of course, I supply it according to specification and now I don't have any idea what is the problem.
PS. Now I connect only MCU, proper supply, RST pullup, external XTAL and one LED to notify that MCU works ok and I still have the same issue.

[Imen.D]

Hello @DKlew.1,

There are a few factors you can take in consideration, please look at the following aspects in more detail:

How to make sure the STM32 starts properly in our design?

Hope this helped you!

Imen

[waclawek.jan]

> I measured time when it's ok and it looked like 100ms - for me it's too long.

What time? What code are you executing? Any Cube/HAL? Try to get rid of. Try not to use Xtal (HSE/LSE?), maybe that's the source of problems. If the 'G4 has BOD, use it.

Tomas Dresler's FAQ appears to be very comprehensive, well worth posting link to it twice! 🙂

JW