nRF9160 behaviour between 2.0 V and 3.0 V

[sheddanl]

I am currently designing a PCB which incorporates the nRF9160, and I would like to know the devices behaviour in between 2.0 V and 3.0 V, as this is below the minimum VDD voltage but above the brownout reset voltage.

My design will not have a user interface for resetting the device when the battery drops below 3.0 V, so it will be required to automatically power on once the VDD rail is appropriately set (e.g. as soon as the user begins to charge the battery).

Will the NRF9160 resume it's flash program or will it require a manual reset? Unfortunately I cannot find anything in the datasheet or the hardware design guidelines, perhaps I've missed something?

Thanks to anyone who has information!

[dejans]

Hi,

The recommended operating conditions for nRF9160 determine minimum battery voltage VDD to be 3 V. In revision 1, nRF9160 chip worked with voltages below 3 V, but in revision 2 the chip is not operating below 3 V.

It is still possible to use AT commands  to put device to flight mode (AT+CFUN=4, AT+CFUN?) as well as to set (and possibly read) the battery status (%XVBAT, %XVBATLVL, %XVBATLOWLVL, %XVBATLOWLVL?).

Best regards,

Dejan