Pinout question of STM32H723ZG board

sidney · ‎2024-09-20

Hello,

UM2407 is the user manual of the STM32H723ZG Nucleo-144 development board. Likewise, the schematics of this board are available as https://www.st.com/resource/en/schematic_pack/mb1364-h723zg-e01_schematic.pdf.

In both the manual and the schematics, there are multiple references to "PF0/PH0" and "PF1/PH1". See, for example, Section 6.5.1. This confuses me, because I don't see how the MCU pin PF0 relates to PH0 (likewise for PF1 and PH1). As far as I can tell, this peculiar labeling is not explained anywhere.

In the MCU's datasheet DS13313, there are separate pins for PH0, PF0, PH1, and PF1.

Can anyone tell me what I am missing here? Why is the labeling as it is?

Cheers, Sidney

LCE · ‎2024-09-20

Compare to datasheet, this Nucleo was made for other STM32 as well, I think.

TDK · ‎2024-09-20

Curious. Your confusion is warranted. It's probably a hold-over from a different chip, but I can't determine what that other chip is. Pin PF0 is separate, shouldn't be labeled as such.

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Andrew Neil · ‎2024-09-20

@LCE wrote:
Nucleo was made for other STM32 as well, I think.

^^^ This ^^^

Indeed most (all?) of the Nucleo are generic, and support a range of target chips.

So, presumably, in some variants a chip with PF0 is used, while in others a chip with PH0 is used?

SofLit · ‎2024-09-20

Hello @sidney ,

UM2407 applies to NUCLEOH723ZG, NUCLEO-H743ZI and NUCLEO-H753ZI as stated in the introduction

H723, H743 and H753 have separated PF0, PH0, PF1 and PH1 pins. The HSE crystal is on PH0 and BH1

I will check internally and get back to you as soon as I have an answer.

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TDK · ‎2024-09-20

Ahh, it's PF0 on the STM32G4 series. That explains where it came from.

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sidney · ‎2024-09-22

Okay that explains ... Thanks for the detective work!

sidney · ‎2024-09-22

It would be useful to explicitly explain this dual label in UM2407 and the schematic. Is it possible to log a documentation improvement request or sometging like that?

LCE · ‎2024-09-22

You can ask for documentation improvement here, and maybe in 2 years it's still not done...

sidney · ‎2024-09-22

@LCE wrote:
You can ask for documentation improvement here, and maybe in 2 years it's still not done...

I fully expect this to be the case. Still, it can't hurt to ask.