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OPT8241-CDK-EVM: I2C devices with same addresses

Part Number: OPT8241-CDK-EVM

On ILLUM board, there is two devices (U18 and U21) on I2C_SLV bus that have the same address (0x54).

I've read in another post that CAT24C02 EEPROM is not used and not populated, but on the EVM I have (REV 2P0), I can see that U21 is populated.

How can this design work with two devices with the same address on the same I2C bus?