Waveshare Isolated RS485 + CAN Expansion HAT for Raspberry Pi

The Raspberry Pi 4B Isolated RS485 + CAN Expansion HAT is an add-on board that provides isolated RS485 and CAN bus communication capabilities to the Raspberry Pi 4B. This HAT is designed for industrial and automotive applications where robust and reliable communication is essential. It features electrical isolation to protect the Raspberry Pi from high voltage spikes and electromagnetic interference, making it ideal for use in harsh environments.

Key Features of Raspberry Pi 4B Isolated RS485 + CAN Expansion HAT

• Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
• 1-Ch CAN, adopts MCP2515 controller and CAN transceiver, converts SPI to CAN
• 2-Ch RS485, adopts SC16IS752+SP3485 dual-chip combination, converts SPI to RS485
• Onboard power conversion circuit, supports 8~28V wide voltage power supply, can power the Raspberry Pi at the same time
• Onboard unibody power supply isolation, providing stable isolated voltage, no extra power supply required for the isolated terminal
• Onboard unibody digital isolation, for isolating the signal, reliable and low power consumption
• Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning proof & anti-electrostatic
• Onboard resettable fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock proof performance
• Onboard 120Ω terminal resistor, configured by jumper
• Onboard terminals and pin headers, more convenient connection
• Breakout SPI control pins, for connecting with host control boards

Specifications of Raspberry Pi 4B Isolated RS485 + CAN Expansion HAT

• Expanded interface: 2-Ch RS485 + 1-Ch CAN
• Communication interface: SPI
• CAN controller: MCP2515
• CAN transceiver: SIT65HVD230DR/SN65HVD23D
• CAN baud rate≦1Mbps
• UART expansion chip: SC16IS752
• RS485 transceiver: SP3485
• RS485 baud rate: 300~921600 bps
• Power supply: External power supply terminal OR Raspberry Pi
• External power supply range: DC 8~28V
• DIO voltage: 3.3V
• Dimensions: 65 × 56.5 m