STM32H743ZI2 NUCLEO board Ethernet doesn't work when moving to JP5 to 1.8V (MCU_VDD)

[DGany.2]

Hi All,

I use the STM32H743ZI2-NUCLEO board with JP5 on 1.8V for MCU_VDD.

Running the LWIP example, the Ethernet doesn't work (It does work when running with 3.3V).

Any idea how to make it work with 1.8V?

Thanks,

David

[KDJEM.1]

Hello @Community member​,

Please make sure that  R4, R43, R44, R45, R46, R47, R48, R49, R50, R51, R52, R53, R59, R61, U1, U10, U15, and SB45 are not removed.

Because after removing these components, it becomes impossible to use Ethernet with1.8 V.

For more explanation, I advise you to refer at the UM2407.

Thank you.

Kaouthar

[DGany.2]

Hi Kaouthar,

Thanks for your reply.

The board is at its manufacturing state, no component was removed.

I just moved JP5 to 1.8V and the ETHERNET stopped working.

Any idea why?

Thanks,

David