could an nRF52840 be wakened up wirelessly from a SYSTEM OFF mode?

[p143]

Hi All.
I would appreciate some help.
Using an NFC tag, could an nRF52840 be wakened up wirelessly from a SYSTEM OFF mode?
Thanks so much

Juan

[Einar Thorsrud]

Hi Juan,

Yes, it is possible to use NFC as a wakeup source in system off, mode. If you are using the nRF Connect SDK you can refer to the NFC: System OFF sample. If you are using the nRF5 SDK and SoftDevice you can refer to this thread.

Einar

[p143]

Thanks, Einar.
Reading the linked info you sent me, I deduce that you also could get the module in SYSTEM OFF mode using an external NFC tag. Is that right?
Thanks.

Juan

[Einar Thorsrud]

Hi Juan,

I am not sure what you mean here? Can you elaborate?

Note that the nRF can only act as a NFC tag, not a NFC reader, so it is not capable of communicating with a tag. Moreover, another tag cannot wake up the nRF from system OFF mode as it wakes up when it detects a NFC field, which can only be generated by a nRF reader.

Einar