11 Device Default Condition from Microchip

The AT24CSW04X/AT24CSW08X is delivered with the EEPROM array set to logic ‘1’, resulting in FFh data in all locations. The Security register contains a preprogrammed 128-bit serial number in the lower 16 bytes. The upper 16 bytes of this register is set to logic ‘1’ resulting in FFh data. The device is delivered with the Security Register Lock function not enabled (see Lock Command) and the Write Protection Register (WPR) set to 00h.