STM32G491 Pin1 Marking

[TwixMeow]

Hey, i

got this STM32G491MET6

The datasheet does not really help here to identify pin 1, since there are 4 markings to see. Anyone has a clue on this? In the previous revision of this datasheet, Pin 1 is bottom left . Already burnt 2 mcus because of this...

[Tesla DeLorean]

Smaller circle, bottom left. The others are molding / ejector related.

ST prints the text in top-to-bottom, left-to-right western form. Held in a readable fashion the Pin 1 designation is down and to the left.

[Tesla DeLorean]

My expectation is that legitimate parts will have a common VSS bonding, which you could continuity check to confirm orientation expectations.

Could perhaps look for other boards, orientation, where VCC and GND enter, HSE placed, SWDIO/SWCLK and VCAPs (where used)

[waclawek.jan]

This appears to be a regression in rev4 of the DS:

@Imen.D, can you please have a look at this? Thanks.

JW

[Imen.D]

Hi @waclawek.jan,

All device markings are being removed from the Datasheet and are being moved to the Technical note: Reference device marking schematics for STM32 microcontrollers and microprocessors.

[waclawek.jan]

Hi @Imen.D ,

Okay, and is/will be there a link/pointer to that document in the datasheets themselves, or is it upon us to spread the gospel?

Thanks,

Jan

[Muhammed Güler]

On most ICs, the bottom row of the label contains the first pin.

[Tesla DeLorean]

Which is great advice until it's not..

You should have a conversation with my pick-n-place guy some day..

[Tesla DeLorean]

Someone should also have a word with the graphics dept.. about unhelpful imagery

[Muhammed Güler]

I've never encountered an IC labeled like this before. Until you showed me this picture, I believed there was a standard for IC naming that I didn't know about.