2.3 ATECC608B-TNGLoRaWAN EEPROM One-Time Programmable (OTP) Zone

The OTP zone of 64 bytes (512 bits) is part of the EEPROM array and can be used for read-only storage. It is organized as two blocks of 32 bytes each. For the ATECC608B-TNGLoRaWAN, the OTP zone is shipped pre-locked and contains the following information:

TTI OTP Zone Values

6A 73 4D 75 37 69 59 4F 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Actility OTP Zone Values

30 39 71 4A 4E 78 49 33 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

The data byte values written into the OTP zone are always available for reading using either 4 or 32-byte reads but can never be modified.

: The bytes in the OTP zone may change over time. These values should not be used in any cryptographic calculations.