NTAG I2C Plus unable to read/write through I2c

[niranjan_rao]

hello,

I am working on NT3H2211 NTAG I2C.

I Could read/ write to the NFC chip through the host microcontroller and a NFC device.

Now all of sudden the I can neither read nor write into the NFC chip through I2C from the host MCU, but I can read/ write NDEF mesages through my mobile phone (NFC device). I can also read registers using the NXP Android app.

I check the I2C pin, everything is correct.

Can someone please tell me whats going on here?

Thank You

Rao

[eljeffo]

Are you able to detect other i2c devices when attached to the same bus?

[niranjan_rao]

Yes,  and I tried with a new ntag and I can read and write to it from the same bus 

[Kan_Li]

Was the problem still there after change the ntag?

[niranjan_rao]

With new Ntag I can read and write through I2C,  with the old Ntag I cannot read and write through I2C

[eljeffo]

Try scanning all i2c addresses and confirm your chip is on the i2c address you expect. (check for NACKs)

[niranjan_rao]

Hello Jeff,

I scanned through all the I2C address, I get NAKs