STM32H725RG VFQFPN68 power scheme. Am I doing it right?

[jmarino]

 

Can somebody tell me whether I am, or not, powering this STM32H725RG in the right way?

As far as I know, after reading several times the specs, the 68 pin package doesn't have LDO (SMPS only).

I've built my first board this way and the MCU got burnt.

 

Thanks.

[STTwo-32]

Hello @jmarino 

I'm not a HW expert. But i can recommand you to take a look at the AN5419. It should be really helpful.

Best Regards.

STTwo-32 

[jmarino]

Thank you, but I already did:

 

https://community.st.com/t5/stm32-mcus-boards-and-hardware/what-s-the-correct-power-supply-scheme-for-h725-735-vfqfpn68/m-p/644714

[MHoll.2]

Ok You say you did check AN5419, so please add the missing capacitors from Table 2. (4x 100nF + 1x 4.7nF on VDD, 1x 220pF on VLXSMPS)

What is connected to VDDA and VBAT?

[jmarino]

All the VSS pins and exposed pad are connected to GND.

The schematic doesn't show all of VSS pins because Kicad symbols hide them and leave only one.

 

Thank you for your time.

[Shee]

"I've built my first board this way and the MCU got burnt."

Sorry to revive a old post, but was this ever resolved? Was thinking of using this chip and there indeed seem to be some confusion as mentioned by jmarino

[jmarino]

I haven't tried anymore by now. I've switched to other projects.

I think some day will try it again...

[TDK]

KiCAD isn't hiding duplicate VDD or VCAP pins. I'm not buying that VSS pins are treated differently.

[jmarino]

In this symbol, it is.

Anyway, unconnected pins it's not the cause. I can assure that. Everything is connected as it has to.