I'm curious about the power part of the STM32WLE

[13eta]

I tried to design a board using the STM32WLE5CCU6, so I referred to the reference designs MB1720,1842,1848, etc.

However, I confirmed that the VDDRF part, which is the part specified in the data sheet, is open with the SB connector.

I searched for the reason why this happened, but I couldn't figure it out, so I'm looking for help in this community.

Why are VDDRF and VDD disconnected?

[RhSilicon · Accepted solution]

Check the AN5407, it's very annoying to work with RF.