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NT3H2111: Reading Memory via I²C and NFC concurrently!?

Question asked by Michael Haar on Jan 10, 2019
Latest reply on Jan 11, 2019 by Michael Haar


I have a question concerning the I²C interface of the NT3H2111 NTAG. I took one of the NTAG's from the OM5569-NT322F evaluation kit and connected its VCC, GND, SDA & SCL Pins to my PIC microcontroller (PIC16F15345).


I'm able to read and write the memory blocks and created a loop to the read the first memory block every 200ms via I²C. 


The problem is that the NFC-interface acts very strange. The NTAG stops working after approx. 10 to 30 NFC read requests, which forces me to redo the anticollision and selection process. 


Is it possible to read/write the memory via I²C and NFC at the same time?

(If not: How can I avoid this collision?)


Thanks in advance!