I2C Switch for Raspberry Pi

The I2C Switch is a 4-channel bidirectional I2C switch that can be controlled via the I2C bus. Using the I2C switch, you can connect I2C devices with the same address to your Raspberry Pi.
It is designed for all Raspberry Pi models and other compatible single-board computers with the 40-pin GPIO connector.
The I2C Switch is based on a PCA9546A controller from NXP. The PCA9546A provides quad bi-directional communication between the I2C port on the Raspberry Pi and any attached I2C devices. Each channel can be individually enabled or disabled.
Powered through the host Raspberry Pi using the GPIO port and extended pins on the GPIO connector allowing you to stack the I2C Switch along with other expansion boards.

Each channel can operate at 2.7V, 3.3V or 5V, allowing you to mix different voltage I2C devices on your Raspberry Pi.
Pull-up resistors must be fitted to each channel's SDA and SCL pins. We recommend using a value between 2.2K and 10K for the pull-up resistors.
The pinout for each channel matches the first 6 pins on the Raspberry Pi GPIO connector with 3.3V, 5V, Ground, SDA and SCL.
The I2C switch supports clock frequencies up to 400KHz.
The reset pin on the PCA9546A is connected to GPIO 27 (pin 13) on the Raspberry Pi GPIO header allowing you to recover from a situation in which one of the downstream I2C buses is stuck in a low state.

Features

• 4 I2C channels
• Connect multiple I2C devices with the same address to your Raspberry Pi
• Channel selection via I2C-bus, in any combination
• 3 address pins allowing up to 8 I2C Switch expansion boards on the Raspberry Pi
• Allows voltage level translation between 2.7 V, 3.3 V and 5 V buses
• Supports clock frequencies up to 400 kHz
• Python, MicroPython, C, C++ and Node JS libraries are available