Hello everyone,
I working with the X-Nucleo-NFC08A1 and the X-Cube-NFC6. I would like to know at what point in the program is the RF field turned on.
The reason for this is that I would like to know how long a Tag has to be in the field to be ready for action.
Rgds
Hi,
the RF field is turned on when the application decides to turn it on. I guess your question is more likely related to the guard time between the field being set on and the first command being sent to the tag.
The NFC Forum defines a guard time for each technologies (NFC-A/B/F/V): a listener device (i.e. a tag) shall be ready to accept commands after a GT guard time after the field has been set on. This means that a reader device has to wait at least this GT guard time before sending a command after its field has been set on. For NFC-V technology, this GT is 5 ms. Note that the ISO15693 has a lower value : The reader wait at least 1 ms after it activated the powering field before sending the first request, to ensure that the tags are ready to receive it.
The RFAL implements this NFC 5 ms guard time for the NFC-V technology.
Rgds
BT
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