STM32WL55JC1 LoW Power Mode

Henry77 · ‎2024-10-09

Hello,

I am using the STM32WL55JC1 microcontroller on the NUCLEO-WL55JC1 board and I tried the PWR_PLSLEEP example which is used to enter LPRUN mode. The example works, but the power consumption measurements are very different from those stated. In RUN mode, the consumption is 9.9 mA, while in LPRUN mode it measures 3.9 mA. Since the example does not set the LDO/SMPS configuration of the microcontroller, it is assumed to be in default LDO mode. However, the stated consumption in LPRUN mode is 220 µA and not 3.9 mA! What could be the reason?

Thanks in advance

Sarra.S · ‎2024-10-10

Hello @Henry77,

When debugging in LP modes, the debug module and some internal clocks remain active and that will increase consumption

Also, which peripherals are activated?

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Henry77 · ‎2024-10-17

Hello,

same power consumption both with debugger and when off.

The example in the ST library has not configured any peripherals except the system clock