NRF9160 Flash Endurance

RE: NRF9160 Flash Endurance

Thomas — Wed, 21 Oct 2020 14:15:50 GMT

Ok great, that’s good to know. Thanks Martin.

RE: NRF9160 Flash Endurance

Martin Lesund — Wed, 21 Oct 2020 13:57:43 GMT

Hi Thomas,
That depends on how much parameters you may have changed.
If you issue AT+CFUN=0 and the parameters you have set is the same that is already in the NVS it will not overwrite the Flash with the same data, so it will not use a "write cycle" for that.

We guarantee the Flash endurance up to 10,000, but it could still work as intended after even if that is out of spec.

RE: NRF9160 Flash Endurance

Thomas — Wed, 21 Oct 2020 13:49:05 GMT

Thanks Martin,

To confirm, we only get 10,000 AT+CFUN=0s?

Kind regards,

Thomas

RE: NRF9160 Flash Endurance

Martin Lesund — Wed, 21 Oct 2020 13:21:42 GMT

Hi Thomas,

Ref

So turning the GPS on/OFF should not "tear down" the Flash endurance.
Only issuing the AT+CFUN=0
- When commanding the device to power off, wait for OK to make sure that Non-volatile Memory (NVM) has been updated.

So instead you can use AT+CFUN=4, which will not update the NVM.
However if your network has support for PSM and/or eDRX it is recommended to use that, to gain the power saving features from not needing to attach/de-attach to the network each time you are using the GPS, plus the speed benefit.

When it comes to the second question, only after the AT+CFUN=0 will it store the settings you have set in the XBANDLOCK to the NVM.

Best regards,

Martin L.