High current consumption in "stop mode"

[ThomasBaumgartner]

Summary:

I configured the application with lowpower options. I connected power analyser to the device (Generci Noce V1.1)and measured current consumption during stop mode. The power analyser was indicating a minimum current consumption of 33uA, which is rather high.

Steps to Reproduce:

1. In app_conf.h set: GNSE_ADVANCED_TRACER_ENABLE 0 DEBUGGER_ON 0

2. build and flash sensors_lorawan application

3. Measure the current consumption

What do you see now?

Minimum current consumption of 33uA, normal current consumption during join / send procedure.

What do you want to see instead?

A minimum current consumption of <5uA.

Has anybody experienced similar behaviour? Anybody able to have lower current consumption in low power mode? @azerimaker

[azerimaker]

Hi, @ThomasBaumgartner

thank you for raising this issue. The extra ~31uA is usually the result of the battery monitor circuit being left ON. This was a minor bug which was addressed in the sensors_lorawan_se app. Please refer to Software/app/sensors_lorawan_se/sensors.c to make sure your code follows the same sequence and let us know the results. I hope it helps.

[ThomasBaumgartner]

Hi @azerimaker

Thank you for your answer. Disabling the battery monitor circuit solved the issue. With this modification the device reaches a current consumption in stop mode of 2.4uA.

[azerimaker]

Happy to help, @ThomasBaumgartner .

[ThomasBaumgartner]

I further recommend removing the GNSE_BSP_BM_Enable(); on line 34 in sensors.c in the function sensors_init() to reduce the current consumtion also between joining and first message transmission.