NTAG I2C block 0x39 (I2C side) confusion - PWD and multiple writes

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NTAG I2C block 0x39 (I2C side) confusion - PWD and multiple writes

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nick002025
Contributor II

For NTAG I2C parts, I have a little bit of confusion regarding block 0x39 (I2C interface) that isn't clear in the datasheet.

  1. Can I change the password by writing to the PWD field in block 0x39 multiple times or it is OTP?
  2. If I set a password with a write to 0x39 and at sometime in the future I need to write to 0x39 to set one of the other configurations, such as PT_I2C, will I overwrite the password or do I need to remember the password since it always read back as 0?

 

 

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danielchen
NXP TechSupport
NXP TechSupport

Hi @nick002025 :

 

Changing the PWD configuration area, dependent on REG_LOCK_I2C bit

 

danielchen_1-1717382054639.png

 

 

danielchen_0-1717381737949.png

 

Setting both bits REG_LOCK_I2C and REG_LOCK_NFC to 1b, permanently locks write access to register default values.

 

 

Regards

Daniel

 

 

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