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The adapter is connected to an I2C device with multiple identical addresses on the same I2C port on the main control board for normal communication and use. TCA9548 TCA9548A 1-to-8 I2C 8 -way multi-channel Expansion Board IIC Module Development Board Chip: TCA9548A Working Voltage: 1.65-5.5V Max Clock Frequency: 400KHz