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.

A2	A1	A0	12c BUS SLAVE ADDRESS
L	L	L	112 (decimal), 70 (hexadecimal)
L	L	H	113 (decimal), 71 (hexadecimal)
L	H	L	114 (decimal), 72 (hexadecimal)
L	H	H	115 (decimal), 73 (hexadecimal)
H	L	L	116 (decimal), 74 (hexadecimal)
H	L	H	117 (decimal), 75 (hexadecimal)
H	H	L	118 (decimal), 76 (hexadecimal)
H	H	H	119 (decimal), 77 (hexadecimal)

Package Contents

• 1x Pahub2 Unit
• 1x HY2.0-4P Cable

Specifications

Specifications	Parameters
Channel Control IC	PCA9548AP
Communication protocol	I2C: 0x70
Net weight	7g
Gross weight	19g
Product size	48 * 24 * 12mm
Packing size	67 * 53 * 12mm

Resources

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