I have connected an NTAG antenna (with NT3H2111 implemented on it) to an existing I2C bus of an FPGA.
I followed the read/write register sequence appeared on the datasheet but I don't get any response from the NT3H. From looking at the SDA bus - I get no ACK from the NT3H. When I try to write to a session\configuration register - While writing i can see on the NXP mobile app that the NTAG memory is locked, but after the write sequence ends: I cant see any change on the registers.
The SCL bus frequency is 100KHz and the NTAG is connected to GND, VCC, SDA and SCL.
What can be the problem?