STM32U031K8U6 Download fail.

[박인구]

hi~! 

I made a IOT prototype with STM32U031K8T6, but I can't download firmware.

The connection isn't working ad it should, can anyone tell me the issues with the attacked circuit ??

I've tried both j-link and st-link download tools. 

 

please reply from users who have used STM32U031.   

[Andrew Neil]

Welcome to the forum.

 

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@박인구 wrote:

I can't download firmware.

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Please give more details -  see: How to write your question to maximize your chances to find a solution 

[TDK]

The schematic looks okay.

[Peter BENSCH]

...except for the repeatedly inserted R7 (NRESET pull-up), which is not necessary for any STM32 because a pull-up is available internally.

However, R7 is only unnecessary and not the cause of unsuccessful downloads. As @Andrew Neil already mentioned, more information is required for this, e.g. photos of the ST-LINK used, in the case of the ST-LINK/V2 also of the back.

[박인구]

Thank you for your answer. I will attach the image of the ST-Link soon.

[Hl_st]

Hello,

did you have set BOOT0 pin to HIGH before you were trying to download the firmware to MCU?

[박인구]

Thank you for your answer. As you can see in the circuit diagram, boot0 is fixed to low.

[csocom]

Edit by ST Moderator: This post has been translated from Korean to comply with the ST Community Terms and Conditions (§10.2).

 

Seoul, 25 September 2025 The STM32U031K8U6 will not connect to the ST-Link SWD. Downloading is not possible.

I do not know the reason.

Have you managed to resolve this?

Debugging pins: 3.3V, SWDIO, SWCLK, NRESET, GND

NRSET is not used.

 

[Peter BENSCH]

@csocom

The same request applies to your question: more information is required for this, e.g. photos of the ST-LINK used, in the case of the ST-LINK/V2 also of the back.

Regards
/Peter

[csocom]

STM32U031K8U6  SWD Download fail

"Write protection is enabled."

"IC purchased from Digi-Key"

"Unable to download after compiling in STM32CubeIDE."

"The connection frequently drops in STM32CubeProgrammer."

 

SWD 5PIN: +3.3V, SWDIO, SWCLK, NRST, GND

 

st VLINK V2

 

"The STM32F469 is working properly using the ST-LINK V2."