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STM32U535CETx Power Consumption Reduction

Ka_T
Associate II

Hello there,

We are designing the STM32U535 to operate in a low-power configuration. According to the datasheet, the current consumption in Run mode is 16.3 μA/MHz at 3.3 V, which is quite low. However, when measuring the actual device, even after subtracting the current used by the components on the board, we observe the following:

  • System startup: 1.5 mA
  • System clock setting: 6.4 mA

These values indicate that a significant amount of current is being consumed.

The main clock settings are as follows:

  • High-Speed Clock (HSE): Crystal
  • SYSCLK: 16 MHz, HCLK: 16 MHz
  • Low-Speed Clock (LSE): Crystal
  • USB: 48 MHz
  • MCO: 8 MHz

Given this configuration, what settings are necessary to achieve further power consumption reduction?

Thanks and regards
Ka_T
4 REPLIES 4
Imen.D
ST Employee

Hello @Ka_T 

There are different ways to slow down the consumption:

  • Low-power modes
  • LPBAM (Low-power background autonomous mode - for STM32U5 series)

To optimize Power Consumption on STM32U5, I advise you to follow this Application note:

Using LPBAM mechanisms optimizes automatically the Power consumption. 

For more details, I suggest you refer to these resources:

I hope these resources are helpful for you.

When your question is answered, please close this topic by clicking "Accept as Solution".
Thanks
Imen
Ka_T
Associate II

Hello Imen,

Thank you for your response. I understand that LPBAM is primarily focused on operating in STOP mode while maintaining functionality.

While my main focus is on controlling in run mode, are there any effective power-saving strategies for run mode? Does the LPBAM concept also include run mode?

Thanks
Ka_T

Imen.D
ST Employee

Ah Ok, so you are using Run mode ! In this case, you can check these articles :

LPBAM is supported in Stop 2 mode (not for Run mode)

When your question is answered, please close this topic by clicking "Accept as Solution".
Thanks
Imen
Thank you for providing the new materials.
I am considering using Low-power run mode to manage the system in RUN mode.
However, I could not find HAL_PWREx_EnableLowPowerRunMode(); in the HAL Driver.
Does the STM32U535 support Low-power run mode?

Thanks
Ka_T