NUCLEO-WL33CC1 Consumption in Deespstop RTC

[gmss]

Hello ST Community,

I am currently testing the PWR_DEEPSTOP_RTC example on the STM32WL33CC and I am observing a higher current consumption than expected in Deepstop RTC mode.

According to the documentation, the expected current in Deepstop mode with RTC (LSI) enabled should be around 1–2 µA. However, I am consistently measuring approximately 50 µA. The application appears to be entering Deepstop correctly (according to the consumption behaviour).

 

I'm measuring with the following configuration:

1. Set the JP2 jumper to OFF.
2. Insert the external supply on pin 2.
3. Connect GND to CN12.
4. Change the position of SW1 (not the default position).

Could you please advise what might be causing this discrepancy?

Thanks.

[Saverio GRUTTA]

Hello,

Please repeat the measurement using the configuration suggested in UM3418, where the JP2 IDD jumper is set to OFF and an ammeter is inserted.

Regarding your setup where you are measuring 50 µA, what is the voltage of the external power supply?

Best regards

Saverio