How to get low current with STOP2 using STM32WB5MMG.

[TK]

In STOP2 mode, the current of STM32WB5MMG is around 170uA at 3V.

Using the same FW (based on the HeartRate example), the P-NUCLEO-WB55 can achieve a low current (approximately 3 uA).

Is there any additional settings for STM32WB5MMG?

[TK]

The pull-up register of PH3-BOOT0 pin affects the current.

On our board, PH3-BOOT0 is connected to VDD with pull-up register according to  datasheet of STM32WB5MMG.

If we remove the pull-up register, the current goes down.

Is there any pull-down register in the STM32WB5MMG at PH3-BOOT0 pin?

On P-NUCLEO-WB55 and STM32WB5MM-DK, PH3-BOOT0 is connected to GND with pull-down register.

PH3-BOOT0 should be connected to GND with pull-down register? 

[Remy ISSALYS · Accepted solution]

Hello,

If you measure the current on the STM32WB5MMG Discovery Kit, it is a known problem. Indeed, the ST-Link supply is connected on STM32WB5MMG supply, so there is an overconsumption. This issue will be corrected on the next version of this board.

Best Regards