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TK_it
TK_it
Associate
February 23, 2022
Solved

How to get low current with STOP2 using STM32WB5MMG.

  • February 23, 2022
  • 2 replies
  • 1102 views

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?

This topic has been closed for replies.
Best answer by Remy ISSALYS

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

2 replies

TK_it
TK_itAuthor
Associate
March 1, 2022

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
Remy ISSALYSBest answer
Technical Moderator
March 17, 2022

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

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