I want to run a Nucleo L476RG at 1.8V at first glance it looks possible with a few caveats.
according to the schematic (C03)
https://www.st.com/en/evaluation-tools/nucleo-l476rg.html#cad-resources
There are two regulators I need to be concerned with
U4 which provides Vdd to the Main CPU is an LD39050PU33R (3.3V)
Unfortunately, this part does not come in a 1.8V version
I can either choose something like LD112PV18R (pin compatible 1.8V)
Or put in a LD39050PUR with an adjustment network spliced on.
The second is U1 used to create 3V3_ST_LINK an LD3985M33R (3.3V)
There is an alternate part LD3985M18R I can use to get 1.8V
One concern I have is the ST-LINK CPU
U2 STM32F103CBT6
The Vdd range specified in 2.0 to 3.6 volts.
I will try running it at 1.8V but might have to detach the ST Link
If I do, I will set the main board to be able to switch between 1.8V or 3.3V
The other concern is the USB ST-Link
I assume I cannot use this as there is no provision for the voltage conversion of USB_DM or USB_DP or USB_RENUMn
Or I can rig up a TXS0108E to shift voltages (except 5V) so I can still use the USB.
Have I missed anything?
