HOW TO EXTERNAL POWER SUPPLY TO STM32MOU157X-DK2 BOARD

[Charan28]

Hi,

I’m using the STM32MPU157x-DK2 development board and would like to power it externally, either using a battery or a different power source (not USB Type-C).

Could you please help with the following:

1. What are the recommended ways to provide external power, such as via a Li-ion/LiPo battery or regulated 5V supply?

2. Can I use the 5V input on the CN6 (EXP connector) to power the board?

3. Should I disconnect USB-C when supplying external power to avoid conflict?

4. Are there any voltage/current limitations, or specific battery protection requirements I should consider?

5. Do I need to change any configuration settings on the board to enable external power or battery supply?

[PatrickF]

Hi @Charan28 

Board was not designed for battery powering (not low power optimization, no 1.8V IOs support, etc...)

CN6 (USB-C) must be used to supply the board with 5V supply (4V minimum).

In case your supply is not USB-C compliant, some errors might occurs (red led flashing and potentially stopped boot). To overcome this, you could remove this line from the uBoot Device Tree.

   		st,adc_usb_pd = <&adc1 18>, <&adc1 19>;

You must not supply the board from CN2 nor CN16 (power integrity issue, too weak wires, etc...).

Maybe best option is to use USB power bank.

Regards.