NUCLEO-H563ZI (STM32H563) Cannot Power with External Power Supply

[Samboozled]

Hi everyone,

I am trying to power my NUCLEO-H563ZI with an external power supply. I have tried everything in the documentation (jumper positions and pin connections) including a 3.3v input (3.3), a 5v input (E5V), and a 9v input (VIN). None of this works when powering the board. The board seems to receive power as LD5 powers on a solid green, however the code on the board does not ever execute. I currently have a test program on it blinking two of the on-board lights. The board works when it is connected by the STLINK USB-C connector. It does not run for any of the external power supply methods. I feel like I've tried everything and am not sure how to fix this (NRST pulls high so that is not the issue either, and the firmware is up to date). I am able to power my NUCLEO-H503RB with this power supply using the 3.3v pin. Trying the same thing with the H563 did not work. Any help is greatly appreciated!

[Melc_dB]

Hello @Samboozled,

Please check the clock configuration. If the external (HSE) clock is selected, verify that it is present on PH0-OSC_IN and PH1-OSC_OUT pins.

 On MB1404 (NUCLEO-H563ZI) boards, HSE crystal is present but disconnected by default:

If that's your issue you can:

• Connect HSE by soldering SB3 and SB4 
• Use internal oscillators: HSI or CSI

Hope that will help you,

best regards,

Melchior

[Melc_dB]

to complete my answer: the user manual precise the default configuration :

 So the CUBEMX template project for the NUCLEO-H563ZI configures the clock source to HSE Bypass, which is provided by the ST-LINK.