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
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8-Channel Bidirectional I²C Switching
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Power Input – 3.3V VIN (logic-level compatible)
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I²C Controlled Channel Selection with dedicated address bits
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Reset Logic – Active-low RST input for flexible startup control
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Compatible with SMBus and Standard/Fast I2C (up to 400kHz)
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Low Voltage Logic – Compatible with 3.3V logic levels
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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:
- TCA9548APWR
- Bus Channels:
- 8 I2C downstream channels
- Control Interface:
- I²C
- Address Select:
- Configurable via A0–A2 pins
- Reset Input:
- Active-low RESET pin
- Operating Voltage:
- 1.65V to 5.5V
- Max Clock Frequency:
- 400kHz (Fast-mode I²C)
- Board Dimensions:
- Approx.30.83mm x18.04mm
- Board Weight:
- 2g
