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TYAMA.2
TYAMA.2
Associate II
September 2, 2025
Solved

Regarding the Mounting of R42 on the STM32WBA55G-DK1

  • September 2, 2025
  • 1 reply
  • 334 views

Hello,

I have a question regarding the STM32WBA55G-DK1 board I have on hand.
On my board, R42 is not populated. Could you please confirm whether R42 is not mounted by default?

R42 is a 0 Ω resistor located on the control line of the general-purpose LED (LD3), and according to the schematic it appears to be mounted.

I would appreciate it if someone could clarify this.

Thank you in advance.

Best answer by STTwo-32

Hello @TYAMA.2 

Just a rectification, as you can see on the table 8 of the UM3255, the LD3 is controlled throw the PB15 after soldering the SB2. Also, after fitting the R42, you can use PA0 to control LD3. For the design version, the one available on the market is designed according to this MB1802 version (B01). 

Best Regards.

STTwo-32

1 reply

STTwo-32
STTwo-32
Technical Moderator
September 2, 2025

Hello @TYAMA.2 

According to the MB1802, the R42 is not fitted on the original design:

STTwo32_0-1756796438898.png

Best Regards.

STTwo-32

TYAMA.2
TYAMA.2Author
Associate II
September 2, 2025

Thank you for your reply.
On the MB1802 board I obtained in the past, R42 was populated.

In that case, from which port is LD3 controlled?
If you could let m

TYAMA2_0-1756797450432.png

 

e know, I would greatly appreciate it.

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