Why does the included LoRa module need the STM32L CPU?

Hardware MKR Family MKRWAN1310
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The LoRa module (CMWX1ZZABZ-078) on the MKR WAN 1310 is actually the SX1276 LoRa chip which is comparable to modules like the RFM95W and other clones.
But the CMWX1ZZABZ-078 does include an STM32L CPU while the other SX1276 modules do not.

Now I wonder why the STM32L is needed or what it's used for on the MKR WAN 1310 ?

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The STM32 adds LoRaWAN functionality to the LoRa device.

1 Like
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Thanks! I'm just sending messages between two devices using LoRa.print() and LoRa.read() so I'm not actually using the LoRaWan functionality. When doing this, is the STM32 powered on or will it be in sleep mode all the time? (consuming just some uA of power?)

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