nRF9160 Modem integrated flash maximum write cycles (Credentials Store)

[Yannick Bus]

Hello,

I have been trying to find an answer to this in the documentation but have thusfar been unsuccesful. For our use case we use the Certificate management part of the modem which has its own NV storage and flash from what i understand. Is there a defined maximum write cycles that is supported by this nvmem? Below are some of the documenation pages i checked but none refer to a maximum.

https://docs.nordicsemi.com/bundle/nwp_034/page/WP/nwp_034/intro.html

https://docs.nordicsemi.com/bundle/ncs-2.5.2/page/nrf/libraries/modem/modem_key_mgmt.html

https://docs.nordicsemi.com/bundle/ref_at_commands/page/REF/at_commands/security/cmng_set.html

[Håkon Alseth]

Hi,

 

The absolute maximum ratings for the flash, on both retention and endurance, is listed here:

https://docs.nordicsemi.com/bundle/ps_nrf9160/page/abs_max_ratings.html

 

Please note that a specification of min. 10000 erase/write cycles does not mean that it stops working at 10001.

 

As for the NV usage in the modem, it is a bit more complicated, as it depends on how much of the space is used, and how the application behaves.

Here is a couple of scenarios listed: 

 RE: How to calculate nRF9160 NVM / flash wear lifetime? 

 

Kind regards,

Håkon