NRF9160 power control to Modem

[Venugopal.K]

Hi,

We are having single Main supply VDD to nRF9160 SoC, which is powering both CoreM33 and Modem.

So this indicates Modem will be always ON when Core M33 is ON. 

Is there a way to control power to Modem (by not powering it continuously)?

I mean to say Core M33 should be always ON and Modem should be ON on some enable basis.

Regards,

Venugopal.K

[Øyvind]

Hello, 

So this indicates Modem will be always ON when Core M33 is ON. 

 Exactly, the nRF9160 uses Arm Cortex M33 which has two cores, one application, and one modem. Both powered via VDD. As described in the Power Supply chapter of the nRF9160 Product Specification.

You can configure the Functional mode (+CFUN ) of the modem by using AT+CFUN:

0 – Sets the device to minimum functionality. Disables both transmit and receive RF circuits and deactivates LTE and Global Navigation Satellite System (GNSS) services.
1 – Sets the device to full functionality.
4 – Sets the device to flight mode. Disables both transmit and receive RF circuits and deactivates LTE and GNSS services.
20 – Deactivates LTE without shutting down GNSS services.
21 – Activates LTE without changing GNSS.
30 – Deactivates GNSS without shutting down LTE services.
31 – Activates GNSS without changing LTE.
40 – Deactivates UICC. Supported in modem firmware v1.2.0 and later.
41 – Activates UICC. Supported in modem firmware v1.2.0 and later.
44 – Sets the device to flight mode without shutting down UICC.

Kind regards,
Øyvind

[kk2mkk]

Øyvind said:

You can configure the Functional mode (+CFUN ) of the modem by using AT+CFUN:

I understand that modem can be turned on/off with the AT commands, what if modem doesn't respond to any AT commands at that instance, resetting the SIP is not the right option because its going to reset my M33 core and if my M33 core runs any meteorological application i am going to critical data in the course of reset, so is there an way to hard reset the modem in such circumstances keeping the M33 core running?

Regards

KK

[Øyvind]

Hi KK,

My colleague Martin has forwarded your question to our R&D team. Will notify you when we get an answer.

Kind regards,
Øyvind

[Martin Lesund]

The feature is coming and is under review:
https://github.com/nrfconnect/sdk-nrfxlib/pull/219