1. The TCA9548A adapter connects to an I2C device with multiple identical addresses on the same I2C port on the main control board I2C bus for normal communication and use. This means that after transferring 1 expander, 8 identical addresses can be connected to the same I2C port. 2. If the 8channel expansion card device is also used normally, the default address of this expander is 0x70, the address can be changed and can be set to 0x700x77 as needed. Theoretically, 8 expanders can be cascaded in the address 0x700x77, and each expander can connect 8 devices with the same address. This realizes the same I2C port and connects 64 devices to the same address and uses them normally. 3. Expansion Board TCA9548A Compatible with IIC Bus and System Management Bus (SMBus) Active Low Reset Input Support for Hot Insertion Low Standby Current No Interference When Switching On Support for Voltages Between 1.8V 2.5V 3.3V and 5V Buses Level Shift TCA9548A I2C IICMultiplexerBreakout Board Depending on the content of the programmable control registers, each individual SCn/SDn channel or a combination of channels can be selected. 4. If a timeout or other improper operation occurs, the system master can reset the TCA9548A by setting the /RESET input to low. Likewise, a poweron reset disables all channels and initializes the I2C/SMBus state machine. Reset and initialization can also be achieved by enabling /RESET, and there is no need to shut down the part.