Moduł 8-kanałowy ekspander magistrali I2C PCA9548A TCA9548A 5V do Arduino

8-channel I2C bus expander PCA9548A TCA9548A

The PCA9548A module is a high-performance I2C bus switch that enables up to eight independent I2C channels from a single microcontroller. This solution allows multiple I2C devices with identical hardware addresses to be connected without conflicts on the bus. The product is a solid choice for advanced electronic projects based on popular platforms, with full compatibility with Arduino, ESP8266, ESP32, and Raspberry Pi.

Key technical features

• Integrated circuit: PCA9548A
• Communication interface: I2C (address 0x70-0x77, configurable)
• Supply and logic voltage: 3.3V - 5V
• Number of output channels: 8 independent channels
• Connector type: 2.54 mm pitch headers (goldpin)
• Module dimensions: 27 x 16 mm

Benefits of using the module

• Resolving address conflicts - connect up to 8 I2C devices with the same base address without issue (e.g. temperature sensors, displays).
• Built-in level translators - the design supports safe communication between 3.3V-powered modules and 5V-logic microcontrollers.
• Easy control - channel selection and switching is done on the fly by sending a single data byte from the host.
• Scalability - address pins (A0-A2) allow up to 8 expander addresses, enabling up to 64 downstream devices on a single SDA/SCL pair.
• Full compatibility - designed to work with microcontrollers; the hardware is ready for ESP32, Arduino, ESP8266, and Raspberry Pi.

Example applications

• Showing independent data on multiple identical OLED displays driven by one controller.
• Complex weather stations with many sensors sharing the same factory address, sending readings to a single central unit.
• Advanced robotics projects and home automation systems that need many downstream I/O modules.
• Education and testing of many different devices in labs on one hardware bus.
• Isolating sections of a circuit to reduce noise from long signal runs.

Thanks to integrated pull-up resistors, using the PCA9548A module in the target system is very straightforward. Simply provide supply voltage (VCC, GND), connect the control pins to the microcontroller (SDA, SCL), and attach target devices to the separate outputs labeled SD0/SC0 through SD7/SC7.