STM32WB55 BLE stop2 mode electric current

[羽落叶秋]

Hellow all,

I am running a custom BLE application on STM32WB55 and I want to run in low power STOP2 mode，At the same time, Bluetooth needs to remain in broadcasting state. I am not sure what the average power consumption is in this case. I monitored that after CPU1 enters STOP2 mode, the average power consumption is about 6mA. Is this normal? Is there a theoretical minimum average power consumption value that can be achieved when CPU1 enters STOP2 mode and Bluetooth is still broadcasting for reference? Thank you very much!

[Lubos KOUDELKA]

Hello,
you can find theoretical power consumption values in the datasheet. 6 mA is quite high average power consumption, but without more details about your application is not possible to evaluate as average power consumption depends on multiple details

• BLE TX power
• advertising interval (how fast is device advertising, between advertising complete device can be in STOP2)
• Number of bytes in your advertising message
• clock setting, GPIO pin state, possibly other active peripherals
  - minor impact on power consumption compared to RF expected here

Have you/could you try the measurement also with Beacon example from our repository?

Best regards,

Lubos