STM32U5A5QJ Part Selection Clarification

[Sakthi_IND]

Hi,

We are currently in the process of selecting components for our project, and we have identified the STM32U5A5QJ9 (STM32U5A5QJ), foot-print size UFBGA 132 7x7x0.6 P 0.5 mm) microcontroller as a potential candidate. However, upon reviewing the datasheet, we noticed that there are two variants available: one with SMPS (Switched-Mode Power Supply) and one without.

Could you please provide clarification on the differences between these two variants? Specifically, we would like to understand the functionality and features that differentiate the STM32U5A5QJ variant with SMPS from the one without SMPS.

Additionally, as we are interested in procuring the exact variant that suits our project requirements, could you please advise on how we can accurately specify and order the desired variant online?

Which variant is suitable for a wearable device (battery powered)?

Regards,

Sathiya

[Andrew Neil]

Take a look at Application Note AN5652, How to optimize power consumption on STM32U5 MCUs:

https://www.st.com/resource/en/application_note/an5652-how-to-optimize-power-consumption-on-stm32u5-mcus-stmicroelectronics.pdf

there's a section on the regulators

There's also a number of other power-optimisation App Notes - see  the Product Page:

https://www.st.com/en/microcontrollers-microprocessors/stm32u5a5qj.html#documentation

See also:

https://community.st.com/t5/stm32-mcus/tips-for-using-stm32-low-power-modes/ta-p/621007

And:

https://community.st.com/t5/stm32-mcus/how-do-i-connect-the-stm32-s-smps-switched-mode-power-supply/ta-p/49590#:~:text=The%20SMPS%20reduces%20the%20overall%20power%20consumption%2C%20however%20the%20drawback%20is%20that%20some%20applications%20may%20be%20perturbed%20by%20the%20noise%20generated%20by...