STM32WL55 doesn't work with 1.8V

[SMav]

Hi,

I am working on a LoRa application with the STM32WL5MOC module which features the STM32WL55JC microcontroller. According to the datasheet, this module is compatible with a voltage level as low as 1.8V.

I am using the STM32CubeWL MCU Package for the firmware, and I have configured the Low Power (LP) mode for a 14dBm transmission power. However, the board stops functioning whenever the voltage drops below 2.05V.

Has anyone encountered a similar issue or have any suggestions on how to address this?

Thanks in advance!

[Andrew Neil]

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@SMav wrote:

the board stops functioning whenever the voltage drops below 2.05V.!

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What, exactly, do you mean by "stops functioning" ?

What board is this on?

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

PS:

Are you using VREFBUF:

[STTwo-32]

Hello @SMav and welcome to the ST Community.

Could you please give more details about this behavior, your configuration, your design... it should be really helpful for our users to help you.

Best Regards.

STTwo-32