7Semi-TCA9548A I2C Multiplexer Board – 8-Channel I2C Bus Switch

The 7Semi TCA9548A I2C MUX Board is a compact, low-voltage 8-channel I²C switch designed to solve address conflicts and expand I²C device connections on a single bus. Based on the robust TI TCA9548APWR chip, it enables the master controller to independently control up to 8 downstream I2C buses (SD0-SD7/SC0-SC7) with programmable channel selection and reset.

Perfect for robotics, sensor-heavy applications, and prototyping platforms like Raspberry Pi or STM32, this board simplifies integration of multiple I2C sensors with identical addresses, and supports multi-master/multi-slave topologies. Voltage-level compatible with 3.3V logic systems and designed for modular stacking or standalone use.

Key Features 

• 8-Channel Bidirectional I²C Switching

• Power Input – 3.3V VIN (logic-level compatible)

• I²C Controlled Channel Selection with dedicated address bits

• Reset Logic – Active-low RST input for flexible startup control

• Compatible with SMBus and Standard/Fast I2C (up to 400kHz)

• Low Voltage Logic – Compatible with 3.3V logic levels

• Operating Voltage: 1.65V – 5.5V

Applications 

• Connect multiple I²C devices with the same address on a single controller

• Interface with multi-sensor arrays in smart farming, weather stations, or industrial IoT

•  Perform I²C bus isolation and debugging during development and testing

• Control separate smart home or building automation zones with identical sensors

• Expand I²C peripherals in robots, drones, and embedded systems

• Switch between I²C-controlled displays, actuators, and EEPROM banks

What’s Included

• 1x TCA9544A I2C MUX Board

Resources

• TCA9548A Datasheet