You can use the EEPROM (AT34C02D-XHM-B 2-Kbit (256 x 8)) for your own needs. However we do not recommend to use the lower half (first 128 byte) if this EEPROM.
The default I2C address is 0xA0. The address can be configured with external pull-up resistors. Floating pins are connected internally to GND. For Write Protect (WP) features, please consider the datasheet and the schematics. The default configuration allows normal write operations.