Please inquire about the meaning of device marking.

[smy.1]

 

When it is 93, it works normally, but when it is VC, it does not enter uart boot mode.

What's the difference?

[Tesla DeLorean]

It's where the wafer's were diffused, so maskset also.

Do you pull BOOT0 LOW in your design?

93 TSMC Taiwan Fab 3

Not familiar with VC, perhaps Crolles or one of the French plants, PCN not helpful

https://community.st.com/s/question/0D53W00000e2tEoSAI/does-anyone-have-a-cheat-sheet-to-tell-me-what-the-date-code-is-and-what-it-stands-for

[Tesla DeLorean]

Dupe https://community.st.com/s/question/0D53W00002IdlGFSAZ/stm32f107rct6-%EB%B6%80%ED%8A%B8%EB%A1%9C%EB%8D%94-%EB%8F%99%EC%9E%91-%EA%B4%80%EB%A0%A8-%EB%AC%B8%EC%9D%98

[mchoi.2]

yes i pull BOOT0 LOW in my design.

[Tesla DeLorean]

@Billy OWEN​ @Peter BENSCH​ @Heather ROBERTSON​ 

Could someone confirm if this is ST product? I don't find any reference to the VC fab code, or any related PCN. Can't say I've done a exhaustive search, but enough that something should have shaken loose.

[Billy OWEN]

Hi @Community member​ 

You know the drill, management needs items like this to be tracked and logged in our Support system to be looked into any deeper, for a variety of reasons.

Hi @shin my​ 

Please kindly take just a moment to open a support case directly at your myST profile: my.st.com/ols

Thanks,

Billy

[waclawek.jan]

>> it does not enter uart boot mode.

> yes i pull BOOT0 LOW in my design.

Shouldn't you be pulling BOOT0 *high* to enter bootloader?

And, also, BOOT1 low.

JW

[Tesla DeLorean]

I should should be able to find PCN without mining the internet and filing online-support requests.

Some of this material should be on ST's site, not things I have to dredge off Mouser and DigiKey, and other distributors.

I understand tracing needs more specific detail, but in broad terms I think Fab/Diffusion location, and package / test sites should be simple enough to explain / decode, especially in an environment where source country needs to be quickly / definitively established.