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NTAG I²C Sector Select on PN532

Question asked by Daniel Kiefhaber on Apr 14, 2016
Latest reply on May 24, 2016 by Daniel Kiefhaber

Hi all,


I'm trying to read out the session registers from an NTAG I²C. I'm using a PN532 board that I'm interfacing from an Arduino via SPI and have some trouble sending a SECTOR SELECT command.


First question: Is the PN532 capable of interfacing with NTAG I²C? If not, which reader IC is capable of doing this?


According to the NTAG I²C data sheet, I need to send 0xC2 FF, which will then be answered by a 4 bit ACK, then I need to send the sector number in the next command.

If I use the InCommunicateThru, what I get as reply to the first command is a CRC error and no message. I guess this makes sense in a way, as the ACK is sent without CRC added to it and the PN532 chip expects a CRC at the end.

Is there a method to disable the CRC checking? Or any other way to do a sector select on an NTAG I²C? The documentation of the PN532 IC is rather sparse, I was hoping that the components are all compatible given that they are all produced by NXP...


I really hope someone can help me with this. Thanks in advance!