Overview
The RDK S100(P) MCU Port Expansion Board (MCU interface expansion board) is the core expansion module for the D-Robotics RDK S100/S100P series development kit. It expands MCU interface functions for faster testing and development, integrating an inertial measurement unit (IMU) and supporting peripheral connections including Ethernet, CAN_FD, ADC, SPI, IIC, and UART. A dedicated FPC connector cable is used to provide stable, reliable high-speed signal transmission and to help reduce interference for critical data channels such as Ethernet and CAN_FD.
Key Features
- Integrated IMU: Bosch Sensortec BMI088, supporting communication control via SPI-5 serial bus.
- One-stop MCU I/O expansion: Provides expansion for Ethernet, CAN_FD, ADC, UART, and other ports to connect sensors, actuators, and network devices.
- Ethernet interface: Gigabit Ethernet connector (RJ45) shown in the topology diagram with RTL8211F (EMAC/RGMII path).
- CAN_FD expansion:5 x CAN_FD connectors; topology diagram shows CAN transceivers 5 x MCP2542 and a 120 ohm selector connector/pin header. CAN_FD connector note: supports up to 8 Mbps.
- Header expansion:30-pin header interface is used for ADC/IIC/SPI and other signals (see Specifications).
- Board interconnect: Includes a 100-pin connector for connecting to the RDK S100 board.
Specifications
| Product Name | RDK S100 MCU interface expansion board |
| Interfaces | 5 x CAN FD; 1 x 30-pin (up to 7 x ADC, 2 x IIC, 2 x SPI); 1 x RJ45 |
| Onboard Modules | IMU: BMI088 |
| Working Temperature | 0 C to 45 C |
| Size | 70 x 70 x 17 mm |
| Weight | 27.6 g (separate expansion board); 56.7 g (overall packaging) |
What's Included
- RDK S100(P) MCU interface expansion board
- Pin header adapter board (labeled: SUB / MAIN; HW V1P0)
- Copper column screws
- Precaution card
- FPC connector cable (included)
Applications
- IIC application (motor drive module)
- PWM application (camera PTZ)
Manuals
- Official documentation: RDK S100 MCU Port Expansion Board hardware introduction
For compatibility or integration questions with the RDK S100/S100P development kit, contact support@rcdrone.top or visit https://rcdrone.top/.
Details


Official RDK S100(P) MCU interface expansion board accessory for adding Ethernet, CAN FD, and extended I/O to the RDK S100/S100P.


Interface topology helps map each connector to the onboard chips, including RTL8211F Gigabit Ethernet and five CAN FD transceivers.

A Bosch Sensortec BMI088 IMU is integrated for motion sensing, with SPI-5 control support for MCU development workflows.

Typical integrations include IIC motor-control modules and PWM-driven camera PTZ setups for rapid prototyping.

Pin mapping for the 30-pin header clarifies available ADC, IIC, SPI, UART, and power pins when wiring peripherals.


Key connectors include the 100-pin board-to-board link, 30-pin header for mixed signals, RJ45 Ethernet, and five CAN FD ports.


The package includes the expansion board, a SUB/MAIN pin-header adapter board, mounting hardware, and the precaution card.
