NT3H2111: Reading Memory via I²C and NFC concurrently!?

[michael_haar]

Hi,

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. :smileycheck::smileyhappy:

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!

[michael_haar]

I found the chapter " 11 Communication and arbitration between NFC and I2C interface" in the datasheet, which states " If both interfaces are powered by their corresponding source, only one interface shall have access to the memory according to the "first-come, first-serve" principle."

Arbitration can be done with the  NS_REG register. 

The question can be closed :smileyhappy: