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Yes, you can leave these pins unconnected if only one device is used. Note that these pins are pulled down internally on the device. Please make sure to set Bits 3-1 in the slave address to "0".
Does this affect in the power consumption? I´m trying to make a direct replace with the FM24CL16B, since i need more memory capacity and the FM24CL16B doesn´t have address pins.
Yes, FM24V02A has a slight higher active/standby current compared to FM24CL16B. Please refer to the device datasheet for more details.