Guidance on Designing STM32WB55CGU7 Microcontroller for 1.8V Operation

[aji]

Hello,

I am planning to design a system using the STM32WB55CGU7 microcontroller with a supply voltage of 1.8V. As per the datasheet, this microcontroller operates within a voltage range of 1.7V to 3.6V. I would like to confirm if designing for 1.8V is appropriate and if there are any specific considerations or recommendations for this voltage level.

For reference, I have attached an image of the power section of my design. I would greatly appreciate any guidance or suggestions from STM32WB experts.

Thank you in advance for your support!

 

[STTwo-32]

Hello @aji 

You didn't attach the power section of your design. I can suggest you follow the recommendations of the AN5246, AN5165, AN5290 and DS11929. Just a recommendation, With SMPS ON, we can't guarantee a Maximum TX power of 6dBm with Vdd < 1.95V (the maximum power of 6dBm is reached when VFBSMPS = 1.7V and VDD > 1.95V). So, STM32WB55 must be set in LDO or SMPS bypass configuration.

Best Regards.

STTwo-32