The 7SEMI TCA9543A I2C MUX Board is a low-voltage, 2-channel I²C bus switch designed for applications where address conflicts or I²C expansion is needed. Built around Texas Instruments’ TCA9543A, this board allows a single I2C master to control multiple slave buses with independent interrupts and reset support.
With support for 1.65V–5.5V logic, voltage-level translation, and hot-swap tolerance, this compact breakout is ideal for sensor networks, multi-sensor gateways, debugging tools, and industrial monitoring.
Key Features
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2-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: Two independent interrupt inputs (INT0, INT1) 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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Qwiic-Compatible Header Pins
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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 TCA9543A I2C MUX Board
Resources
- IC:
- TCA9543APWR
- Bus Channels:
- 2 (SC0/SD0, SC1/SD1)
- Control Interface:
- I²C
- Address Select:
- A0, A1 pins (up to 4 devices on 1 bus)
- Interrupt Lines:
- INT0, INT1 (input), INT (output)
- Reset Input:
- Active-low RESET pin
- Operating Voltage:
- 1.65V to 5.5V
- Max Clock Frequency:
- 400kHz (Fast-mode I²C)
- Board Dimensions:
- Approx.21.76mm x17.66mm
- Board Weight:
- 1G
