Expand Possibilities with the TCA9548A 8-Channel I2C Expansion Board
The CJMCU-9548 TCA9548A 8-Channel I2C Expansion Board lets you connect and independently control up to eight I2C devices from a single I2C bus. This compact I2C multiplexer is perfect for projects that require multiple identical sensors, displays, or modules without address conflicts.
Key Features of the CJMCU-9548 TCA9548A I2C Module
- 8 independent I2C channels controlled via a single master bus
- Configurable I2C address range (typically 0x70 to 0x77) to chain or select devices
- Compatible with 3.3V and 5V systems – works well with Arduino and Raspberry Pi
- Compact CJMCU breakout format for easy breadboard or PCB integration
- Minimal signal interference and straightforward switching logic
Compatibility and Supported Platforms
This I2C multiplexer for Arduino and Raspberry Pi is designed for broad compatibility with microcontrollers and SBCs. Typical uses include:
- Arduino Uno, Nano, Mega and compatible boards
- Raspberry Pi models (use with I2C enabled in OS)
- ESP32, ESP8266, STM32 and other embedded platforms
Why use a TCA9548A I2C multiplexer
- Resolve device address conflicts when multiple identical sensors are required
- Isolate noise or bus issues by switching only the required channel
- Scale sensor networks without adding additional I2C buses
Technical Details and Specifications
- Chipset: TCA9548A I2C switch
- Channels: 8 independent I2C channels
- I2C Address: Base address commonly 0x70, configurable via address pins to 0x77
- Voltage: Compatible with typical 3.3V and 5V systems (check pull-up resistor wiring for mixed voltages)
- I2C Speed: Standard fast mode speeds supported (check TCA9548A datasheet for limits)
How to Use the CJMCU-9548 with Arduino and Raspberry Pi
- Connect VCC and GND to your controller (match voltage levels and pull-ups as needed).
- Connect SDA and SCL of the master to the board SDA and SCL pins.
- Set the board address using the A0-A2 address pins if needed to avoid conflicts.
- Select a channel by writing the control byte to the TCA9548A at its I2C address; only the selected channel will pass signals.
- Communicate with devices on the active channel as you would on a direct bus.
Refer to the TCA9548A module datasheet for control registers and detailed timing information.
Applications
- Multi-sensor systems for robotics and automation
- Prototype labs and educational projects with many I2C peripherals
- IoT gateways and embedded designs requiring scalable I2C connectivity
What you get
- 1 x CJMCU-9548 TCA9548A 8-Channel I2C Expansion Board
- Mounting and wiring are straightforward for rapid prototyping
Buy in Pakistan
Available for online purchase in Pakistan. This board provides reliable performance for hobbyists, students, and professional developers who need to expand their I2C ecosystem with precision.
Note: Images are for illustration purposes only.
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