NFCのトピックCLRC633 Interrupt on tag discovery

CLRC633 Interrupt on tag discovery

fernandohcoelho — Tue, 10 Jul 2018 17:13:53 GMT

Hello everyone,

I got my new CLRC633 kit and I asked myself... is it possible to make the reader send an interrupt to my MCU when a tag is discovered?

What I'm doing today in my main MCU routine is asking the 633 if there is a tag on field. But this is very time consuming and it is not the syncronized way of doing it.

Thanks in advance.

F. Coelho

Re: CLRC633 Interrupt on tag discovery

IvanRuiz — Wed, 11 Jul 2018 21:31:57 GMT

Hello,

CLRC663 has an IRQ pin. Please refer to table 5 for the available interrupt sources in the data-sheet:

https://www.nxp.com/docs/en/data-sheet/CLRC663.pdf

Hope this helps!

Regards,

Ivan.

Re: CLRC633 Interrupt on tag discovery

fernandohcoelho — Thu, 12 Jul 2018 12:00:04 GMT

Hello Ivan, how you doing?

I saw all the interrupts available but none of them seems to fit my needs. Interrupt RxSOFIRQ looks like what I need but I'm not sure.

In the datasheet it says RxSOFIRQ will be raise when a SOF or subcarrier is detected. About this, I don't know if the tag, when on the field, starts to send the subcarrier immediately or if it needs a "startup" command, like a REQA for example.

Do you know how this works?

Thanks in advance.

F. Coelho

Re: CLRC633 Interrupt on tag discovery

IvanRuiz — Fri, 13 Jul 2018 14:35:40 GMT

Hello,

Please let me check this internally.

Regards,

Ivan.

Re: CLRC633 Interrupt on tag discovery

fernandohcoelho — Mon, 23 Jul 2018 11:40:34 GMT

Hello Ivan, any news about this question?

Thanks in advance!

F. Coelho

Re: CLRC633 Interrupt on tag discovery

IvanRuiz — Thu, 02 Aug 2018 14:53:21 GMT

Hello,

Please accept my apologies for the late response. Please see below from APPs team:

This only is raised if a valid answer is coming from the Tag. This means that the Reader needs to perform a command at the begining on which the Card is responding for example a Request.

Regards,

Ivan.

Re: CLRC633 Interrupt on tag discovery

fernandohcoelho — Thu, 02 Aug 2018 19:26:48 GMT

Thank you Ivan!!! It's always great to have my question answered by the NXP team. I'll try to solve the sync problem with other technics then.

Regards,

F. Coelho