Current consumption figures between L5 and U5 family

[apadom]

Dear Community,

When comparing STM32L5x2 line with STM32U5x9 line I had the surprise to read in product selector's view:

Supply Current Run Mode (per MHz) typical:

- For STM32L5x2:    96

- For STM32U5x9:   26

Are these numbers correct?
If yes, what can explain those differences (nearly 4x) between the two lines of MCUs?

Kind regards,
dom

[Issamos · Accepted solution]

Hello @apadom 

The STM32L5x2 is a line of low power MCUs but the STM32U5x9 is line of ultra low power MCUs. That explain the difference of consumption between the 2 lines of MCUs. For more details, take a look at the datasheets of the STM32U5x9 and the STM32L5x2.

Best regards.

II

[Sarra.S]

Hello @apadom, welcome to ST Community, 

Also, take a look at AN5371, it illustrates the differences between U5 and L5 series.

[apadom]

Thanks @Sarra.S and @Issamos for your answers.

I think that what puzzled me if that they were both shown as ultra-low power microcontrollers, at various places. In the end, it was hard to catch the real differences between the two lines. It's now much more clear.

Again, thank you both for your support.

[Daniel Glasser]

I find it interesting that the STM32U545 is listed as using more power in almost low-power modes also supported by the STM32L562, but the power per MHz is much, much lower.  It seems that for battery powered applications where the CPU only wakes up for external events or timer expiration, the L5 may be better than the U5.