PSM current consumption nRF9160

[Antoine]

Hello,

I'm working on getting PSM mode with the Serial LTE Modem on the nRF9160 v1.0.0. The power consumption of the modem (26.4 uA) is too high compared to the documentation in PSM (it should be 2.7 uA).

I juste used the file "nrf9160dk_serial_lte_modem_2022-02-17_ec486dab.hex" and "mfw_nrf9160_1.3.1.zip".

I send this commands :

AT+CPSMS=1,,,"10100011","00100001"

at#xsleep=2

I work with OTII :

I don't understand why the consumption is so high.

Also, I don't understand how to wake up the modem once it is in PSM. When I send commands via the UART after the command "at#xsleep=2", it does not respond.

Thank you for your help !

[Albrecht Markus Schellenberger]

Thanks a lot for your feedback, Antoine!

Antoine said:

Consumption when SLM is running normally and the modem is not in PSM : 24,1 uA

Consumption after it has entered PSM : 1.58 mA.

This is indeed very strange and sounds close to not possible to be honest. Could you provide me with a full application log from boot of the nRF9160 until the modem enters PSM?

Thanks & regards,

//Markus

PS, FYI: Due to Easter vacation, our technical support team will be out of office from tomorrow on. You can expect a reply earliest Tuesday next week.

[Antoine]

Hello,

I just used the file "nrf9160dk_serial_lte_modem_2022-02-17_ec486dab.hex" without tweaking the code.
Then I used the UART2 on the board to send AT+CFUN=1 to connect to the network. Once connected, I sent AT+CPSMS=1,,, "10100011", "00100001".
For consumption, I get this:

I don't understand why the modem consumes so much power.

Thanks for your help

Best regards,

Antoine