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
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4-Channel Bidirectional I²C Switching
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Voltage Translation between 1.8V, 2.5V, 3.3V, and 5V buses
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I²C Controlled Channel Selection with dedicated address bits
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Interrupt Support: independent interrupt inputs (INT0, INT1, INT2, INT3) and one combined output
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RESET Input to recover from stuck bus scenarios
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Compatible with SMBus and Standard/Fast I2C (up to 400kHz)
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5.5V-Tolerant Inputs with low standby current
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Operating Voltage: 1.65V – 5.5V
Applications
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Connect multiple I²C devices with the same address on a single controller
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Interface with multi-sensor arrays in smart farming, weather stations, or industrial IoT
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Perform I²C bus isolation and debugging during development and testing
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Control separate smart home or building automation zones with identical sensors
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Expand I²C peripherals in robots, drones, and embedded systems
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Switch between I²C-controlled displays, actuators, and EEPROM banks
What’s Included
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1x TCA9544A I2C MUX Board
Resources
- IC:
- TCA9544APWR
- Bus Channels:
- 4 (SC0/SD0 to SC3/SD3)
- Control Interface:
- I²C
- Address Select:
- A0, A1, A2 (support 8 device combinations)
- Interrupt Lines:
- INT0–INT3 (inputs), INT (combined output)
- Reset Input:
- Active-low RESET pin
- Operating Voltage:
- 1.65V to 5.5V
- Max Clock Frequency:
- 400kHz (Fast-mode I²C)
- Board Dimensions:
- Approx.28.67mm x17.78mm
- Board Weight:
- 2g
