7semi - TCA9544A I2C Multiplexer Board – 4-Channel I2C Bus Switch

Simplify I²C expansion and address conflicts with the 7SEMI TCA9544A I²C MUX Board. This 4-channel bidirectional I²C/SMBus multiplexer supports seamless switching between multiple slave devices and offers advanced interrupt logic, reset functionality, and voltage-level translation.

Based on the reliable TI TCA9544A IC, the board enables a single I²C master to communicate with up to four downstream I²C buses, each with its own interrupt line (INT0–INT3). This is especially useful in projects involving identical sensor devices, data acquisition systems, or industrial I/O multiplexing.

Key Features 

• 4-Channel Bidirectional I²C Switching

• Voltage Translation between 1.8V, 2.5V, 3.3V, and 5V buses

• I²C Controlled Channel Selection with dedicated address bits

• Interrupt Support:  independent interrupt inputs (INT0, INT1, INT2, INT3) and one combined output

• RESET Input to recover from stuck bus scenarios

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

• 5.5V-Tolerant Inputs with low standby current

• 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

• TCA9544A Datasheet