topic Re: RFID/NFC tag in NFC

RFID/NFC tag

simonschmitt — Fri, 17 Jan 2020 14:01:52 GMT

Hello everyone,

I'm looking for a RFID/NFC tag chip able to interract with classic RFID readers (ISO14443) and NFC readers (ISO15693) and who can transmit differents datas depending on the technology used by the reader.

I've seen the PN7462 is able to interract with these different norms, but it seem that this chip is designed to be inserted in RFID readers as far as I understand it.

Can this chip be used as a tag or should I take a look at a different NXP family?

Thank you.

Re: RFID/NFC tag

Jonathan_Iglesias — Tue, 21 Jan 2020 16:47:11 GMT

Hi Simon Schmitt,

Hope you are doing great, well in this case we do not have a multi frequency tag, we have tags that can be embedded in a card for example, so the card has a HF and a LF tag inside and depending on the reader frequency is the IC you trigger, but a solution combining both, we do not have, we have a list of manufacturers that have solutions using our ICs that can help you. RFID Ecosystem | NXP

about the PN7462, this is a reader, this reader is a full NFC reader which means that supports the three modes of NFC.

1.- Reader/writer

2.-Card emulation ( ISO 14443)

3.-Peer to peer

also this reader has a contact interface for contact cards.

Have a great day !
BR

Jonathan

Re: RFID/NFC tag

simonschmitt — Thu, 13 Feb 2020 13:30:58 GMT

Hi jonathaniglesias,

I think there is a little misunderstanding here. My fault I haven't been enough precise.

Both protocols will be on the same carrier frequency (HF 13,56MHz). My project is about a card which can be readed by a ISO15693 reader for simple identification and by an NFC reader (like a phone with NFC).

A colleague told me about Desfire tags but didn't know much about detailed functions.

I just would like to know if this tag can choose what to do based only on the protocol used to interact with it.

Thank you,

Re: RFID/NFC tag

Jonathan_Iglesias — Mon, 17 Feb 2020 02:19:50 GMT

Hi Simon,

Hope you are doing great, well first I want to be clear in some things, when you use a card in HF ( 13.56MHz) this card can communicate with either an NFC reader and a Vicinity ( ISO 15693) reader, since both protocols support same communication frequency but the issue can come if you want a vicinity reader with an NFC card to be activated at a Vicinity range ( up to 1m). said this, the question is more on the reader side, the card can be activated and communicate with a reader either vicinity or NFC as long as the reader support the command set and provides the minimum energy to activate that card either for interaction or just identification. so if in this case a DESFire is a T4T ( type 4 tag) that supports ISO 14443 commands and also ISO 7816-4. if you implement the activation procedure in the discovery loop of your reader there should not be any issue, like it happens in our PN7462 reader, one of the examples ( Discovery loop) can detect different type of tags from ISO 15693, ISO 14443, P2P, card emulation.

Jonathan

Re: RFID/NFC tag

simonschmitt — Fri, 21 Feb 2020 16:16:51 GMT

Hi Jonathan,

Thank you for your answer.

In my application, vicinity range is not a problem. I will only need 2 to 5 cm range.

You say Desfire tags can communicate with both ISO 14443 reader and ISO 15693 reader but in documentation, I can't see any reference to 15693.

Sorry if the answer of this question is self-evident, I'm quite new to the NFC world.

And when you speak about "discovery loop" of the reader, that mean I can't use an old reader where I can't put my word about it programmation?

Thank you again.

Re: RFID/NFC tag

Jonathan_Iglesias — Tue, 25 Feb 2020 14:34:32 GMT

Hi Simon Schmitt,

Hope you are doing great, I said that a vicinity reader is able to communicate with DESFire as long as the firmware inside the reader have the commands to interact with DESFire, this does not mean DESFire support 15693.

I am not sure I am understanding your last question :

"And when you speak about "discovery loop" of the reader, that mean I can't use an old reader where I can't put my word about it programmation?"

basically the discovery loop is the polling state where the reader search for different technologies

Jonathan