Adafruit PCA9548 8-Channel STEMMA QT / Qwiic I2C Multiplexer - TCA9548A Compatible

The Adafruit PCA9548 8-Channel I2C Multiplexer is the perfect solution for anyone looking to expand their I2C bus without worrying about address conflicts. If you have multiple I2C sensors or devices that share the same I2C address and need to connect them to your microcontroller, this multiplexer acts as a gatekeeper, allowing you to select which device will communicate on the I2C bus at any given time.

Unlike traditional I2C setups where devices must have unique addresses, the PCA9548 lets you connect up to 8 devices with the same I2C address and switch between them as needed, sending I2C commands to the selected device. It’s like having a magic switch for I2C, making it a game-changer when working with multiple sensors that can’t be configured to use different addresses.

Key features include:

• 8 channels for connecting up to 8 devices with the same I2C address.
• Adjustable I2C address (default is 0x70, but can be changed to 0x77 using jumpers).
• Simple control: Send a single byte to select the desired output channel and direct I2C packets accordingly.
• JST SH connectors for easy connections to your I2C devices.
• 3.3V onboard regulator to power 3V devices even when working with a 5V microcontroller.
• STEMMA QT / Qwiic compatibility, making it easy to connect to other devices in the Adafruit ecosystem without soldering.
• Power LED indicates the hub’s connectivity status.

This I2C multiplexer is ideal for expanding your I2C bus and controlling multiple devices with the same I2C address. It includes mounting holes for easy integration into your project. The product comes as an assembled PCB and does not include cables or sensors (which are available separately).

This device works seamlessly with STEMMA QT and Qwiic compatible boards, allowing you to connect multiple devices without worrying about address conflicts.