To store important information off-chip, Nordic Thingy:91™ is equipped with a 16-Kbit I2C serial EEPROM (electrically erasable programmable read-only memory) as of version 1.4.0. The I2C address is 0x50.

Information stored in region 0x0600 - 0x07FF is written during the production of Nordic Thingy:91. This is critical for the correct operation and should not be changed.

Figure 1. EEPROM schematic
EEPROM schematic