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]

Hello Antoine,

Antoine said:

When I just send the command to activate the PSM, the average consumption of the modem during the PSM is 1.47 mA. As shown in the picture, the communication does break down but the power consumption does not drop.

Is there any difference in power consumption when SLM is running normally and the modem is not in PSM vs after it has entered PSM? Are you using the UART0 or UART2 interface with the SLM?

Antoine said:

What value for CONFIG_SLM_INTERFACE_PIN should I set to wake up the modem via rts from the UART when I use the command "at#xsleep=2"?

The pin is configured to be triggered on a physical level low.

Regards,

Markus

[Antoine]

Hello,

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.

UART2 : I use the nRF9160 just to send AT commands.

I have the impression that it is because of the MK22FN128VLL10: the RTS doesn't work on the UART2, but that doesn't solve the PSM problem.

Best regards,

Antoine