M5Stack Pa.HUB V2.1 I2C Expansion Unit 1 to 6 PCA9548A

With the M5Stack Pa.HUB V2.1 expansion unit, you expand your I2C communication efficiently and flexibly. This small but powerful module is based on the PCA9548AP multiplexer chip and transforms a single I2C port into six independent channels. You can effortlessly operate multiple sensors or modules with identical I2C addresses simultaneously. Switching between the channels is done dynamically via I2C commands. An integrated DIP switch allows you to easily set the I2C address, enabling you to use multiple Pa.HUBs simultaneously in the system. The six Grove-compatible ports make connecting external modules a breeze. Whether for smart sensor networks, data acquisition, or complex prototypes, this expansion provides a solid foundation for your projects. Thanks to LEGO-compatible mounting holes, the module can also be mechanically integrated without complications. In short: a must-have for anyone who wants to get more out of their I2C bus.

Features:

• I2C Multiplexing: The module is based on the PCA9548AP chip, which expands one I2C port to six independent channels.
• Address configuration via DIP switch: With the integrated DIP switch, you can flexibly set the I2C address in the range 0x70 to 0x77.
• Multiple use of the same bus: You can operate multiple I2C devices with the same addresses simultaneously, as access is channel-based.
• Grove-compatible connectors: Six HY2.0-4P ports allow easy connection of external sensors or modules.
• Multiple units can be cascaded: By switching addresses, multiple expansions can be used in parallel.
• Compact and stackable design: The compatible LEGO mounting holes ensure easy integration into modular setups.

Application Examples:

• Expansion of sensor connections on development boards
• Simultaneous operation of multiple I2C displays or measuring devices
• Cascaded I2C communication in automation systems
• Structured organization of I2C devices in smart prototypes
• Use in educational and training systems for I2C communication

Documentation: 

• Quick Start Guide
• Official M5Stack Forum

Technical Data:

• Manufacturer: M5Stack
• Manufacturer SKU: U040-B-V21
• Multiplexer IC: PCA9548AP
• Communication: I2C with address range 0x70 to 0x77 (configurable via DIP switch)
• Expansion ports: 6x HY2.0-4P (Grove-compatible)
• Operating temperature: 0–40 °C
• Dimensions: 48 × 24 × 12 mm
• Weight: 13g

Scope of Delivery:

• 1x M5Stack Pa.HUB V2.1 I2C expansion unit
• 1x HY2.0-4P connection cable (20 cm)