RE: nrf9160 LTE Serial Modem App UART power management

user91187 — Fri, 13 May 2022 13:19:55 GMT

Hi,

What nRF Connect SDK are you using/planning to use?

[quote user=""]we can use the AT#SLEEP=2 command to allow the nrf9160 to go into low power. This will also turn of the UART on the nrf9160. For power saving we can also now turn off the UART on the external MCU.[/quote]

Yes that is correct, UART will be disabled.

You can test thins on the DK and see the details in the doc : https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/serial_lte_modem/doc/Generic_AT_commands.html#power-saving-xsleep

[quote user=""]we will have to activate the CONFIG_SLM_WAKEUP_PIN pin (button 1 on the DK), which will turn on the UARTs on the nrf9160 and data can be excahnged. Is this correct?[/quote]

Yes

[quote user=""]Similarly, if the nrf9160 wants to send something to the external MCU (e.g. a URC received from the network), it will activate the CONFIG_SLM_INDICATE_PIN and also turn on its UART. Then external MCU can detect the CONFIG_SLM_INDICATE_PIN, turn on its own UART and data can be exchanged. Is this understanding correct?[/quote]

Yes

Regards,
Jonathan

RE: nrf9160 LTE Serial Modem App UART power management

user116129 — Fri, 13 May 2022 02:30:20 GMT

If the external MCU now wishes to transfer data to the nrf9160, we must activate the CONFIG SLM WAKEUP PIN pin (button 1 on the DK), which turns on the nrf9160's UARTs and allows data to be exchanged. io games