MCP2515 CAN Bus Module with TJA1050 Transceiver – SPI Interface

1. Product Description

The MCP2515 CAN Bus Module with TJA1050 Transceiver is a compact communication module designed to add Controller Area Network (CAN) functionality to microcontrollers and embedded systems through an SPI interface. It combines the MCP2515 standalone CAN controller with the TJA1050 high-speed CAN transceiver, enabling communication between compatible devices over a CAN bus.

The module is suitable for Arduino UNO and other compatible microcontroller projects that require reliable communication between multiple electronic devices. It supports the CAN 2.0B protocol, including standard frames, extended frames, and remote frames, with data fields of up to 8 bytes and communication rates of up to 1 Mbps.

The SPI interface simplifies integration with microcontrollers, while the onboard CANH and CANL connections allow the module to connect to a CAN network. It also features a selectable 120Ω termination resistor, an interrupt output, LED indicators, and mounting holes for convenient installation.

With its compact design and support for high-speed CAN communication, the MCP2515 module is suitable for automotive electronics, industrial automation, robotics, embedded control systems, and CAN-based communication projects.

2. Features

• MCP2515 standalone CAN controller

• TJA1050 high-speed CAN transceiver

• Supports the CAN 2.0B communication standard

• Communication speed of up to 1 Mbps

• SPI interface for communication with a microcontroller

• Supports standard, extended, and remote CAN frames

• Data field length of 0–8 bytes per CAN frame

• CANH and CANL bus connections

• Selectable 120Ω termination resistor through J1

• Two CAN bus connection options: KF301-2P terminal block and pin output

• INT interrupt output for controller notification

• Onboard LED indicators and independent key, as specified

• Power connection pins for convenient integration

• Mounting holes with 23 mm × 38 mm center spacing

• Suitable for Arduino and other compatible SPI-enabled controllers

3. Specifications

Note: Actual current consumption depends on the module revision, LED circuit, transceiver state, and connected CAN bus. Confirm electrical specifications for the exact board before finalizing a design.

4. Working Principle

The module uses two main integrated circuits to provide CAN communication.

MCP2515 CAN Controller: The MCP2515 handles CAN protocol functions, including message formatting, frame transmission, reception, and error management. It communicates with the host microcontroller through SPI.

TJA1050 CAN Transceiver: The TJA1050 converts the controller’s digital CAN signals into the differential electrical signals used on the CAN bus and converts received bus signals back into logic-level signals for the controller.

When a microcontroller sends a message through SPI, the MCP2515 processes the message and passes it to the TJA1050 for transmission over the CANH and CANL lines. Incoming CAN messages are received by the transceiver and processed by the MCP2515, which can notify the microcontroller through the INT pin.

This arrangement allows microcontrollers without an integrated CAN controller to participate in compatible CAN networks.

5. Pin Definitions

Important: The supplied pin list does not include all possible SPI signals. The module also requires an SPI data input connection, generally identified as SI or MOSI, on the actual board. Check the board’s silkscreen and pinout before wiring.

6. Interface and Connections

The module provides several connection options:

• J1 – 120Ω termination selection: Enables or disables the onboard termination resistor, depending on the board’s jumper arrangement.

• J2 – CAN terminal block: Provides CANH and CANL connections through the KF301-2P terminal block.

• J3 – CAN pin output: Provides another connection point for CANH and CANL.

The termination resistor should be configured according to the CAN network topology. In a typical properly terminated CAN bus, 120Ω termination is placed at each physical end of the bus, not at every node.

7. SPI Communication

The module communicates with the host microcontroller using the Serial Peripheral Interface (SPI). The microcontroller configures the MCP2515, sends CAN messages, and reads received messages through this interface.

Common compatible platforms include:

• Arduino UNO

• Arduino Mega

• Other Arduino-compatible boards with suitable SPI support

• Embedded systems with compatible SPI interfaces

Software libraries compatible with the MCP2515 can simplify initialization, message transmission, reception, and interrupt handling.

8. CAN 2.0B Protocol Support

The module supports CAN 2.0B functionality, including:

• Standard frames: Messages using the standard 11-bit identifier.

• Extended frames: Messages using the extended 29-bit identifier.

• Remote frames: Frames used to request data from another CAN node.

• Data fields: Up to 8 bytes per classic CAN data frame.

• Communication speed: Up to 1 Mbps, depending on bus length, wiring, and network configuration.

This makes the module suitable for exchanging control commands, sensor readings, status information, and other embedded-system data.

9. Termination Resistor

The onboard 120Ω resistor helps match the impedance of the CAN bus and reduce signal reflections.

For a typical linear CAN bus, termination resistors are installed at the two physical ends of the network. If the module is connected at one of those ends, its onboard termination may be enabled. If it is an intermediate node, the termination is normally disabled.

Incorrect termination can cause communication errors, especially at higher data rates.

10. Applications

The MCP2515 CAN Bus Module is suitable for:

• Automotive electronics prototyping

• Industrial automation

• Robotics and mobile robots

• CAN-based sensor networks

• Embedded communication systems

• Motor controller communication

• Battery monitoring prototypes

• Vehicle telemetry projects

• Arduino CAN bus projects

• Distributed control systems

• Data acquisition systems

• CAN protocol learning and experimentation

11. Package Includes

– 1 × MCP2515 CAN Bus Module with TJA1050 Transceiver

Microcontroller boards, connecting wires, CAN cables, power supplies, and other accessories are not included unless explicitly specified.

12. Product Disclaimer

• This module supports classic CAN 2.0B, not CAN FD.

• The stated maximum speed of 1 Mbps depends on bus length, wiring quality, termination, and network configuration.

• The module requires a compatible SPI interface and suitable software.

• Verify the board’s complete pinout before wiring; the supplied pin list does not explicitly identify the SPI MOSI/SI pin.

• Use the correct power supply and ensure that connected logic signals are electrically compatible.

• Configure the termination resistor according to the physical CAN bus layout.

• This is a CAN communication module, not a complete standalone CAN system.

Note: Product images are for illustration and representation purposes only. The actual product may slightly differ in appearance, colour, design, or component placement from the images shown due to manufacturing variations and production batches.