NUCLEO-144 STM32L4R5 : 1V8 powering & st-link

[SimonF]

Hello,

I'm trying to use this nucleo board with the camera DCMI interface. This camera has operation condition between 2V8 and 3V1.

Currently, I power the camera with a external source of 2.9V but the nucleo board is in 3V3.
Is there a solution to power the MCU (but still have the st-link working) to 3V or 2V8?

Thank you,

Simon

[ahsrabrifat · Accepted solution]

Use the CN7/VIN pin (external power-in) or VDD jumper pins to supply your custom voltage (e.g., 2.9V).

On most Nucleo boards, the ST-Link is isolated from the MCU power rail using a jumper called JP5 or a regulator enable jumper.

Remove JP5 (or similar) to disconnect the 3.3V regulator from the MCU side.

Then power the MCU side only through the 3V3 pin (which becomes an input when JP5 is removed) with your 2.9V supply.

ST-Link will still work over USB as long as it senses valid V_DD on the MCU side.

[SimonF]

Hello @ahsrabrifat,

The User Manual indicates only 7V < VIN < 12V and I see no VDD pin (only mention about VDD_MCU that can be set to 3,3V or 1,8V).
I unsoldered SB6 which is the 3V3 voltage regulator but User Manual clearly says that ST-LINK is no longer accessible once done. Despite that, I can confirme that I'm able to connect via ST-LINK in USB and that it sees 2,9V! Thank you :)