clrc663 interrupt problem

fw02 — Sat, 27 Oct 2018 05:26:35 GMT

Dear all,

We are using CLRC663 plus connected externally with the MCU over UART. We have successfully detect the RFID tag and get 7-byte UID of RFID tag using CLRC663 plus using LPCD mode. Our problem is that we do not want to implement LPCD mode in our application because RFID tag reading range is very short in LPCD mode and we want more range.

Our question is that Is there any interrupt which can detect the RFID tag single time before firing REQA command.We want to detect the RFID tag single time.When we put RFID tag in front of CLRC663 plus it will give ATQA reasponse 0x0044.

But if we put RFID tag in front of CLRC663 plus reader and do not take away the card , ATQA response was changing from 0x0044 and 0x0000 alternatively.So it becomes difficult to detect the RFID tag single time.So Is there any interrupt which can detect the RFID tag single time before firing REQA command.

Your reply would be highly appreciated.

Thank you.

Re: clrc663 interrupt problem

Jonathan_Iglesias — Thu, 13 Dec 2018 14:36:15 GMT

Dear Hasmukh Prajapati,

I understand this is all about power consumption, there is nothing to detect the card except the LPCD on the IC, you can try to power off and on the whole IC to spare some energy, maybe every hundred ms and see if this brings any benefit to your application, in LPCD there is this RF spike every 500ms so it is a similar approach, please check the application note for LPCD in the 663 https://www.nxp.com/docs/en/application-note/AN11783.pdf .

Jonathan

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