2024-05-20 09:27 AM
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...
2024-05-20 09:34 AM - edited 2024-05-20 09:37 AM
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.
2024-05-20 09:45 AM - edited 2024-05-20 09:47 AM
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)
2024-05-20 10:06 AM
This appears to be a regression in rev4 of the DS:
@Imen.D, can you please have a look at this? Thanks.
JW
2024-05-23 08:25 AM
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.
2024-05-23 08:57 AM
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
2024-05-23 09:01 AM
On most ICs, the bottom row of the label contains the first pin.
2024-05-23 09:15 AM
Which is great advice until it's not..
You should have a conversation with my pick-n-place guy some day..
2024-05-23 09:26 AM
Someone should also have a word with the graphics dept.. about unhelpful imagery
2024-05-23 09:53 AM
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.