NUCLEO-H723ZG Ethernet Under VDD=1.8V

[JYI2]

This is to NUCLEO-H723ZG/NUH723ZG$AT2 eval board.

When set VDD=3.3V by JP5, the ethernet (lwip + no os) DHCP is working fine and stable.

When switch to VDD=1.8V by JP5, the STM32 is working fine but the ethernet DHCP is working randomly, most of time failed.

Checking the board schematic of ethernet section, it looks fine for LAN8724 VDDIO=VDD=1.8V and 3.3V to transformer section.

 Using this eval board for 1.8V environment project, enthusiastic hope to make it works stable.

 Any helps are welcome.

Thanks.

JYI

 

 

 

[TDK]

No.

The LAN8724 chip needs 3.3 V on VDD1A and VDD2A. It is not guaranteed to work if these are 1.8 V. Since the boards connects these pins to VDD, it won't work when VDD is only 1.8 V.