How to achieve the expected standby current (JP4) on NUCLEO-U385RG-Q?

[AkasaDesu_1840]

Hello,

[Question]
How should I modify the sample project so that I can achieve the expected current consumption in standby mode (as described in the user manual)?

[Board]

• NUCLEO-U385RG-Q

[Development Environment]

• STM32CubeIDE 1.19.0

• STM32CubeMX 6.15.0

[PWR_STANDBY]
I am using the sample project “PWR_STANDBY” generated from STM32CubeMX 6.15.0. I would like to modify this project for my purpose.

[Goal]
I want to put the board into standby mode, measure the current through JP4, and reproduce the expected value described in the user manual (https://www.st.com/resource/en/datasheet/stm32u385rg.pdf, page 115).

[Current Situation]
When I run the sample project without any modification, I measure about 255 µA. This is much higher than the expected value in the user manual.

Thank you for your advice and support.

[Shirley.Ye]

you can download the STM32Cube package for U3 at STM32CubeU3 | Product - STMicroelectronics, the project is located at Projects\NUCLEO-U385RG-Q\Examples\PWR

[KDJEM.1 · Accepted solution]

Hello @AkasaDesu_1840 and welcome to the community;

Could you check your measuring device?

I recommend you to follow these steps:

- Debug PWR_STANDBY example

- Run the example.

- Stop run

- Remove JP4

- Connect an amperemeter to JP4 to measure IDD current.

On my side I tested the PWR_STANDBY example and I found that the standby current consumption is 0.6µA

Also, I used STLINK-V3PWR and I found the same results

Thank you.

Kaouthar

[AkasaDesu_1840]

Hello @KDJEM.1 

Thank you for your response, and sorry for my late reply.

I was able to achieve a similar standby current to the user manual by following your method.

Best regards, AkasaDesu_1840.