initialize multiple i2c slaves with the same address

Using Arduino Networking, Protocols, and Devices
2

The chips are all initially programmed with the same address having the low order three bits set to 000 in their EEPROM.
You would have to put them on the I2C bus one at a time, program a unique low-order address into the EEPROM for each of them. Then you can use use them all at the same time on the I2C bus.

Pete