Current consumption in stop mode using B-L072Z-LRWAN1

[Remco Groenendaal]

Posted on May 03, 2017 at 11:42

Does anyone have any experience with the current consumption when using B-L072Z-LRWAN1 (STM32L072 and LoRa board) with i-cube-lrwan 110?

I can't get the current consumption below below 1.1mA no matter what i try. In lowpower (stop) mode all pins are set as analog, clocks are disabled, debug is off.

- I checked the device going into STOP mode

- Configured all non-connected pins to GPIO_MODE_ANALOG, GPIO_NOPULL

- Configured connected pins (UART, etc.) to GPIO_MODE_OUTPUT_PP, GPIO_NOPULL, and set to zero

I also stopped the debug clock in the ARM:

  __HAL_RCC_DBGMCU_CLK_ENABLE( );

  HAL_DBGMCU_DisableDBGSleepMode( );

  HAL_DBGMCU_DisableDBGStopMode( );

  HAL_DBGMCU_DisableDBGStandbyMode( );

Also TCXO is Off.

Still the current consumption is above 1 mA.

Anyone out there that managed to get the current down?

Thanks!

#lora #b-l072z-lrwan1

[maxence forget]

Posted on May 17, 2017 at 15:51

Hi,

I'm very interesting by the LoRa consumption using B-L072Z, I have the same problem.

I mesured the RF consumption of my LoRa module after adding the jumpers (

http://www.st.com/content/ccc/resource/technical/document/user_manual/group0/ac/62/15/c7/60/ac/4e/9c/DM00329995/files/DM00329995.pdf/jcr:content/translations/en.DM00329995.pdf

)

My measure of Tx (38mA) and Rx (11mA) are ok, but in sleep mode my consumption is too big.

For the RF consumption in sleepmode, I find 1,1mA. My mesure of Tx and Rx are good, but in sleepmode my consumption is too big.

Thanks in advance for any help.

Max

[Krzysztof Pranga]

Posted on May 18, 2017 at 10:06

Have the same problem.

I'm using my custom board and the LoRa module same as in B-L072Z.. My current consumption during stop mode is 1.16mA.

So this is not a B-L072Z hardware problem. I suspect there is some bug in the code (I-CUBE-LRWAN) or hardware problem with LoRa murata module.

[Amel NASRI]

Posted on May 18, 2017 at 18:20

Hello All,

Referring to

http://www.st.com/content/ccc/resource/technical/document/user_manual/group0/31/96/2f/3b/df/c1/40/2e/DM00300436/files/DM00300436.pdf/jcr:content/translations/en.DM00300436.pdf

, required setup for power consumption measurement is to have:

• No DEBUG
• No TRACE
• No SENSOR_ENABLED

Updates have to be made in hw_conf.h.

Is it the case for you?

-Amel

[Tesla DeLorean]

Posted on May 18, 2017 at 17:40

LEDs Off? Other things off the GPIO, USART, etc.

>>

I suspect there is some bug in the code (I-CUBE-LRWAN)

Definately several of those...

[maxence forget]

Posted on May 19, 2017 at 09:11

Hi,

I updated my code to deactivate DEBUG, TRACE and SENSOR ENABLED but I have always 1,16mA in sleep mode.

[Krzysztof Pranga]

Posted on May 19, 2017 at 09:39

I have only LoRa module, SWD connector, 1 LED (controlled through GPIO) and vdd capacitor on test PCB.

Of course I made a test with disabling: sensors, debug, trace. I have tested the code in configuration with no HW activation, no LoRa initialization and going to

HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

just after start of the program and still have got 1.16mA

[Amel NASRI]

Posted on May 19, 2017 at 13:05

Hello,

It seems that TCXO is always enabled in you configuration. Please check JP9 setting: it should be in position 1-2 to have TCXO controlled by PA12.

JP3 is the one that allows you to measure IDD_MCU.

I suggest you to refer to

http://www.st.com/content/ccc/resource/technical/document/user_manual/group0/ac/62/15/c7/60/ac/4e/9c/DM00329995/files/DM00329995.pdf/jcr:content/translations/en.DM00329995.pdf

for more details.

Please confirm if this helps you to reach the expected consumption.

-Amel

[maxence forget]

Posted on May 19, 2017 at 14:13

With this configuration, the consumption in sleepmode seems to be ok but I can't join my gateway whereas with the JP9 in positon 2-3 I can, there is some modification that I should made?

Thanks in advance

[maxence forget]

Posted on May 19, 2017 at 15:32

I made some screen about my terminal windows in debug and trace with the same code but the JP9 in a different postion:

• JP9 in position 2-3:

• JP9 in position 1-2: (impossible to join the gateway)