Marco: I read the reference you quoted and this is using a different radio (RFMx 900 MHz radio). The semtech chip I referred to was the SX1276. No idea if there are other chips available that might give you lower power drain. I did a quick online search and found a datasheet for the RFM95/96/97/98 module and it says Lora receive current of 10.3mA. So not sure where the ~2mA came from.
You might be better off asking the Adafruit folks since all the numbers I have seen are around 10mA. > On Nov 7, 2017, at 3:57 PM, Marco Ferreira <[email protected]> wrote: > > Thanks Will. > > The 10mA is sort of what I'ver been reading. > Was just poking to see if anyone had different numbers based on real > experience and/or with mynewt specifically. > > I'm specifically after the scenario were LoRa radio would be turned on to > listen/receive for very short periods of time. > I read on an Adafruit post that "The ~13mA quiescent current is the current > draw for listening (~2mA) plus ~11mA for the microcontroller." > That made me question if it'd be possible to bring LoRa power drain to only > 2mA. > > source: > https://learn.adafruit.com/adafruit-feather-32u4-radio-with-lora-radio-module/power-management > > Sent from Mailspring > (https://link.getmailspring.com/link/[email protected]/0?redirect=https%3A%2F%2Fgetmailspring.com%3Fref%3Dclient&recipient=dev%40mynewt.apache.org), > the best free email app for work > > On Nov 7 2017, at 1:14 am, will sanfilippo <[email protected]> wrote: >> Marco: >> >> Not sure if you are referring to the current mynewt LoRa implementation or >> LoRa in general. The Semtech SX1276 chip draws 11-12mA in receive mode. The >> processor will add to this of course. If you are asking about mynewt >> specifically the current drain has not been measured but there are quite a >> few GPIO turned on plus the HFXO and the processor running so it will be >> more than that. >> >> The current drain will also change quite a bit based on the class of the >> LoRa device. Class C is constantly receiving. Class A is only receiving for >> a very short amount of time so the current drain will be considerably less. >> Lots of variables there; really only way to know is measure it. >> >> Will >> >> >>> On Nov 6, 2017, at 3:30 PM, Marco Ferreira <[email protected]> wrote: >>> >>> Hi everyone! >>> >>> Does any of you have an idea what's the power consumption for Rx with LoRa? >>> >>> Thanks >>> -- >>> Marco >>> >>
