ST25R3916 External field detector

[ChintaN1]

Hello Support team,

@Travis Palmer 

We are working on the ST25R3916 NFC-based product.

We are facing the issue of high power consumption during NFC active scanning operation so, we want to start the NFC active scanning mode on the External field detector.

Please provide a sample code or step to enable the External field detector with Peer detection functionality.

Thanks & Regards,

Chintan Patel

[Ulysses HERNIOSUS]

Hi Chintan,

ST25 Embedded NFC library contains an example in Active Peer to Peer (ap2p_proprietary) where both ends are enabling their own field before transmission. However while being active active pretty much always one side has its field on (except for 300us pauses when switching from one transmitting to the other).

But not sure if that is what you need. Please describe what you need in more detail!

BR, Ulysses

[ChintaN1]

Hello,

We have one NFC receiver device which is based on the ST25R3916 module.

We are required to detect the Active NFC tag and Passive device(ex. mobile NFC) in low power mode of NFC.

We have tried with NFC wakeup mode but in this, the detection range of the NFC tag is reduced so we are looking for another better option.

In the datasheet of ST25R3X found that, the NFC peer detection option is there but not sure whether it is useful or not.

Thanks

[Ulysses HERNIOSUS · Accepted solution]

Hi Chintan,

not sure which one is more sensitive:

• field detector (used in low power NFC peer detection), you can also use the normal peer detection from ready mode which gives you lower available step(rfe=8 with en_fd_c=1 and en=1).
• Amplitude wake-up with delta=2
• Phase wake-up with delta=2

It may also depend on your antenna setup PCD to PICC. So best if you do some experiments here. I presume also the matching on the PICC should be different when using AP2P.

BR, Ulysses