Unit ChainBus is a Chain series communication protocol conversion unit. It integrates an STM32G031G8U6 chip and uses a UART daisy-chain communication protocol to enable chained connections of multiple devices. It supports multiple protocol interface conversions, allowing various peripherals to be expanded on the same bus, and integrates hardware control and data interaction capabilities.
The UART interfaces on the left and right sides are used to connect Chain series devices, supporting device UID query, version query, link device enumeration, heartbeat communication, and more. The top multifunction expansion interface can be used to extend Unit series devices, supporting I2C communication control, GPIO management (input and output), ADC sampling, and NVIC interrupt management. It is suitable for industrial control, IoT, smart home, and other application scenarios, providing an effective solution for unified control and data interaction of multiple devices.
Features
STM32G031G8U6 core controller
UART daisy-chain communication protocol, supporting single / multiple Chain series devices in a chained connection
1 x RGB LED for status indication
1 x HY2.0-4P multifunction expansion interface for extending Unit series devices
2 x HY2.0-4P UART interfaces for extending Chain series devices
Development Platform
UiFlow2
Arduino
Includes
1 x Unit ChainBus
2 x HY2.0-4P Grove Cable (5cm)
Applications
Chain bus device expansion
Industrial control
IoT
Smart home
Specifications
Specification
Parameter
MCU
STM32G031G8U6
Interface
2 x HY2.0-4P UART Interfaces, 1 x HY2.0-4P Multifunction Expansion Interface
RGB LED
1 x WS2812
Communication
UART 115200bps @ 8N1
Chain Protocol
Chain Bus UART daisy-chain communication protocol
Chain Features
Device UID query, version query, link device enumeration, heartbeat, etc.
Expansion I/O
I2C communication control, GPIO management (including interrupt configuration and status query), ADC sampling, NVIC interrupt management
Power Consumption
RGB white light max brightness 3.3V@17.72mA
Product Size
29.8 x 24.0 x 8.0mm
Product Weight
5.9g
Package Size
138.0 x 93.0 x 10.0mm
Gross Weight
13.3g
Learn
The left and right HY2.0-4P interfaces of Unit ChainBus are used for Chain Bus input and output respectively, while the top expansion connector is used to connect Unit series devices.
Unit ChainBus adopts the same UART daisy-chain protocol as other Chain series expansion devices (such as Chain Angle, Chain Encoder, etc.). It can serve as a custom functional node and be connected to the Chain Bus. Multiple Unit ChainBus devices can be expanded on the same bus. Through interface function configuration, different types of hardware peripheral controls can also be integrated on the same bus.
The blue sections in the protocol represent the top Grove interface control functions, and the pink sections represent the UART serial communication functions of the left and right Grove interfaces.
