The TCA9548A 1-to-8 I2C 8 multi-channel expansion board enables communication with multiple I2C devices that have the same address that making it simple to interface with. Using this you can get up to 8 same-address I2C devices hooked up to one microcontroller - this multiplexer acts as a gatekeeper, shuttling the commands to the selected set of I2C pins with your command. The CJMCU TCA9548A I2C 8 Channel Multiple extensions development board is interesting in that it has an I2C address (0x70 by default) – and you basically send it a command to tell it which I2C multiplexed output you want to talk to, then you can address the board you want to address. Technical data: 1-to-8 Bidirectional Translating Switches. Supports Hot Insertion. Low Standby Current. Active-Low Reset Input. Power Up With All Switch Channels Deselected. I2C Bus and SMBus Compatible. 5V Tolerant Inputs https://elecena.pl/product/22627128/tca9548a-i2c-8-channel-multiplexer 2023-02-23 https://elecena.pl/product/22627128/tca9548a-i2c-8-channel-multiplexer 2025-06-08 https://elecena.pl/product/22627128/tca9548a-i2c-8-channel-multiplexer 2025-10-26 https://elecena.pl/product/22627128/tca9548a-i2c-8-channel-multiplexer 2025-10-28