Problem with powering STM32F767zi Nucleo from external source

[spark.3]

 hello.

A problem occurred when proceeding through an external power source.

The first one I am using is the Nucleo F767zi, and the sb111 has been removed.

----------------------normal------------------

 

 -----------------------abnormal--------------

 

 Also, the picture below is my current firmware version.

 What should I do to solve this problem

What part should I check to see if the power signal is going well?

[AScha.3]

nice pics - will some text follow ?

[spark.3]

I put text.

Obviously, I started by putting text in, but I think I made a mistake.

thank you

[MasterT]

It is not an Arduino UNO, you should not power a board via +5V pins. Read this doc:

https://www.st.com/resource/en/user_manual/um1974-stm32-nucleo144-boards-mb1137-stmicroelectronics.pdf

Paragraph 6.4.2

[spark.3]

Hello, thanks for the reply.

However, it is the same even if E5V is applied through CN11 pin 6.

[AScha.3]

did you set the jumpers... ?

>>

Using V IN or E5V as an external power supply

When powered by VIN or E5V, it is still possible to use the ST-LINK for programming or

debugging only, but it is mandatory to power the board first using VIN or E5V, then to

connect the USB cable to the PC. In this way the enumeration succeeds, thanks to the

external power source.

The following power-sequence procedure must be respected:

1. Connect jumper JP3 between pin 1 and pin 2 for E5V or between pin 5 and pin 6 for

VIN

2. Check that JP1 is removed

3. Connect the external power source to VIN or E5V

4. Power on the external power supply 7 V< VIN < 12 V to VIN, or 5 V for E5V

5. Check that the green LED LD6 is turned ON

6. Connect the PC to the USB connector CN1

If this order is not respected, the board may be powered by USB (U5V) first, then by VIN or

E5V as the following risks may be encountered:

1. If more than 300 mA current is needed by the board, the PC may be damaged or the

current supplied can be limited by the PC. As a consequence the board is not powered

correctly.

2. 300 mA is requested at enumeration (since JP1 must be OFF) so there is risk that the

request is rejected and the enumeration does not succeed if the PC cannot provide

such current. Consequently the board is not power supplied (LED LD6 remains OFF)

<<

[MBald.1]

Did you resolve this? I am having a similar issue with a Nucleo  NUCLEO-F446 board and was hoping any solution you had my help.