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disk91 / itsdk-example-sigfox-sx1276

Sigfox communication with a sx1276 radio module on a Murata module
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Power consuption in STOP mode with reserver pins PCx #3

Open zokl opened 4 years ago

zokl commented 4 years ago

Hello,

I found an issue with power consumption in HALT mode with pin PC0_RESERVED_Pin. In your example, you work with PC0 as a reserved pin. If you send the system to sleep the first time everything is hood and the system has a consumption about 3 uA. After waking up and then going to sleep again, the power consumption increase to 2 mA per each other sleep. The problem is in pin PC0 (PC0_RESERVED_Pin). If I disable this pin sleeping works without a problem. The sigfox sending too.

Do you know the reason why the PCx reserved pins are activated? If I try to disable PC0, PC1, and PC2 everything works without problem (sleeping, sending, etc.).

Thank you very much for your answer.

disk91 commented 4 years ago

PC0 is LoRa Reset PC1 is LoRa Tx boost PC2 is LoRa Radio switch My experience is keeping these signals unconnected during sleep will be a source of over-consumption. In this example the sx1276 stack is not initialized until you get the right settings so you can have a certain number of sequence where the sx1276 power consumption is not correct. You can call SX1276InitLowPower(); to corectly set all that stuff low power before initialize sigfox /lora. I'm not sure this answers your question but it could. I did not make a power test on this example (I will) but basically on my prod application I don't have a such issue even with the same PC0,1,2 configuration. Let me know about your progress on this.

zokl commented 4 years ago

PC0 is LoRa Reset PC1 is LoRa Tx boost PC2 is LoRa Radio switch My experience is keeping these signals unconnected during sleep will be a source of over-consumption. In this example the sx1276 stack is not initialized until you get the right settings so you can have a certain number of sequence where the sx1276 power consumption is not correct. You can call SX1276InitLowPower(); to corectly set all that stuff low power before initialize sigfox /lora. I'm not sure this answers your question but it could. I did not make a power test on this example (I will) but basically on my prod application I don't have a such issue even with the same PC0,1,2 configuration. Let me know about your progress on this.

Thank you for your answer it is corresponding with my investigation. I have tried several code modifications and now I am able to sleep with power consumption till 3 uA. I will try to make more test in that area.

Thank you very much.