Support Required for High Standby Current Consumption on STM32U599VI

[Spencer007]

I am currently using the STM32U599VI in our application and are attempting to achieve the low-power performance specified in the datasheet.

According to the device specifications, the low power standby mode current consumption is expected to be approximately 195 nA under the specified test conditions. However, in our application, we are observing a significantly higher current consumption in standby mode, approximately 5-6 mA.

I would appreciate support in identifying the possible causes of this high standby current and guidance on the necessary hardware and software configurations required to achieve the expected standby current consumption.

[Gyessine]

Hello ​@Spencer007 

It appears that something in the project blocks the MCU from entering standby mode correctly. Usually, an interrupt is not disabled before the system calls standby mode, or another peripheral prevents entry into standby mode.

As a first step, it is understood that a custom PCB is in use. To eliminate possible hardware issues, use this firmware example and uncomment SYSTEM_STANDBY_MODE defines in the main.h file to allow the SYSTEM to enter in Standby mode. Then, check whether the MCU enters standby mode correctly.

Best regards,
Gyessine