M5Stack I2C Hub 1 to 6 Expansion Unit (PCA9548APW)

The PaHUB2 is an I2C Expandable Hub which can expand a single I2C HY2.0-4P interface and connects up to 6 I2C channels. It allows you to mount slave devices with the same I2C address (by polling control the different channels to achieve in-device coexistence). It has an embedded PCA9548AP-I2C multi-channel switch IC.

Note: When it’s connected, the PaHUB2 will be polling control the different channels to achieve in-device coexistence. Please pay attention to the order of channels when programming.

Features

• I2C HY2.0-4P PORTA expansion
• 2x LEGO compatible holes
• Support multiple nesting
• 1-6 expansion

Please refer to the schematic and PCA9548AP data manual, the Unit can modify the I2C address of the device by adapting the level combination of A0~A2 pins. (The default address is 0x70)

3 Position of Welding patch are reserved on the PCB board of the Unit, A0-A2 respectively, as shown in the figure below.

After welding the 0 ohm resistor, the corresponding pin will change from low level to high level. The pin level combination and its corresponding I2C address are shown in the table below.

Package Contents

• 1x Pahub2 Unit
• 1x HY2.0-4P Cable

Specifications

Resources

• paHUB2 Documentation
• PCA9548AP Datasheet
• EaslyLoader download (program burner which contains the test program used by Pahub2 & M5Core)
• Arduino test example
• UIFlow Example
• Schematic