Murata LoRa board in sleep

[SARTHAK KELAPURE]

Posted on December 25, 2017 at 06:38

Hello everyone,

I am using Murata LoRa discovery board DISCO-072CZ-LRWAN. A simple query

When I put the STM32L072CZ (present in the board) to sleep, does that mean the SX1276 LoRa trans receiver also goes to sleep? 

Thank you in advance

-Sarthak

#murata-cmwx1zzabz #sleep-mode #stm32l0 #stm32l0-stm32l0-discovery #murata-cmwx1zzabz-lrwan1-(ver1.1.1)

[T J]

Posted on December 25, 2017 at 21:41

if the LoRa signals are randomly arriving, you will need to wake up the processor.

otherwise, if you control the network, the LoRa unit is always in standby mode to save the battery life.

That is a primary function of LoRa

[Tesla DeLorean]

Posted on December 26, 2017 at 18:44

I don't believe the default configuration powers down the radio. You can turn the TCXO on/off, and the main loop can control when the radio is in RX, TX or SLEEP mode. The code doesn't reinitialize the radio all the time, so I'm assuming it stays powered. The radio provides for may modes of operation, but you'd need a deep understanding of the stack and radio to get to optimal power performance.

As Nick notes your radio will need to be awake and listening to get inbound signals.