Sigfox with STM32WL55: Higher consumption in stop mode than specified in AN5480

[LLr.1]

Hello,

I want to check the low consumption in stop2 mode. I use directly the Sigfox_PushButton example of cubeWL

Page 71/79 of the AN5480 (Rev4 - July 2020) :

I use the X_NUCLEO-LPM01A to measure the consumption in stop mode. With this setup:

I supply the MCU through I_SoC (JP1) (at 3.3V)

I remove JP7 to remove LED5.

I remove STLK jumper (as shown in UM2592 P.22)

I measure : 725uA !!! 

How in practice to measure these 2uA ?

Thank you

Best regards

[Bruno_ST]

Hello @LLr.1​

Great ! 

 -> I don't have 2uA each time.

Yes please try with pull-up on PA2/PA3.

Br

Bruno

[LLr.1]

I tried to pull-up PA2/PA3 on Cube MX:

but I cannot change the "No pull-up..." in "Pull-up". Also, What is the use of this LPUART1 ? It is not used with LoraWan end node

[Bruno_ST]

Please try changing in the code directly. I will check why CubeMX doesn't want to and report a tool bug if it is the case...

[Bruno_ST]

@LLr.1​ 

Please try to pull them up directly in the Code. I will check, but i suspect a CubeMX bug that i will report if it is the case.

BR,

Bruno

[LLr.1]

I cannont see the classic MX_GPIO_Init(); to initialize the pins where I can do that ?

[Bruno_ST]

I have check there is no bug tool (CubeMX version 6.4.0)In the code it is in HAL_UART_MspInit().

BR,

Bruno

[LLr.1]

Thank you,

but I have always the same behavior

I will try an other board NUCLEO

Best regards

[LLr.1]

Update : it is just a problem with this board, with another board, I have the good current curve.

Thank you