Nucleo g431kb: What does "DNF" mean ?

[Jad]

good morning, I am wondering what the DNF means in my datasheet:

 does it mean there is no connection between pb3 and the LED? then i am wondering if i can use PB3 for other instances, and i am also wondering why there is this DNF instead of just not connecting PB3 and the LED
Best regards

[mfgkw]

DNF = "do not fit"

Keep it open usually (or think about before closing)...

And yes, you can use PB3 for any other purpose, since it is not connected to LD2.

[Jad]

so it means that the solder bridge do not fit?
can i still use PB3 as GPIO input from the nucleo header for another use?
thank you for the quick awnser

[mfgkw · Accepted solution]

> can i still use PB3 as GPIO input from the nucleo header for another use?

In theory yes.

UM2397 states:

LD2 USER
This green LED is connected to the following STM32G4 I/O:
• PB8, if the configuration is SB7 ON, and SB6 OFF (default configuration)
• PB3, if the configuration is SB7 OFF, and SB6 ON

But according to the schematic PB3 is also connected to T_SWO via SB4, so it is connected to the onboard ST-Link.

So if you want to use PB3 as GPIO it will be necessary to open SB4, and you will lose SWO.

[Andrew Neil]

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@Jad wrote:

so it means that the solder bridge do not fit?

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Exactly.

It means that it is not fitted during manufacturing - but left there as an option for the user fit, if required.

It is pretty common throughout the industry - not specific to ST or STM32

Sometimes you will see similar terms like DNP = Do Not Place, etc ...

eg, https://fedevel.com/forum/beginners/423-dnf-do-not-fit-components

#DNP #DNF #NotFitted