TJA1050 CAN Bus Transceiver High Speed Interface Module

Specifications

• Chipset: NXP TJA1050.

• Data Rate: Supports up to 1 Mbps.

• Power Supply: 4.75V to 5.25V DC.

• Nodes: Supports up to 110 nodes on a single bus.

• EMI Performance: Extremely low Electromagnetic Emission (EME).

• Protection: Thermal protection and transmit data (TXD) dominant time-out function.

• Operating Temperature: -40°C to +85°C (Industrial Grade).

Key Applications & Projects

• Automotive Diagnostics: Build your own OBD-II interface to read real-time engine data.

• Industrial Automation: Interfacing with PLCs and industrial sensors using the CAN protocol.

• Robotics (CANopen): Controlling high-end brushless motor drivers or actuators in complex robotic arms.

• Vehicle Tracking: Creating telematics units that monitor fuel consumption and speed via the vehicle's internal bus.

Project Evolution

• Past Projects (Prerequisites): If you’ve mastered I2C or SPI communication between two Arduinos on the same bench, you’re ready for CAN.

• Feature Upgrade: CAN bus allows for Long-Distance Networking (up to 1km at lower speeds) and high-noise environments where I2C would fail. This module unlocks the ability to communicate with real-world vehicles and industrial machinery.

• Effort/Requirements: Advanced. Requires a CAN Controller (like the MCP2515) to sit between this transceiver and your Arduino, or a microcontroller with a built-in CAN peripheral (like the ESP32).

Virtual Technician & Wiring

⚠️ Tech Tip: CAN is a differential bus. You must use a twisted pair of wires for CAN_H and CAN_L to maximise noise immunity. Ensure a 120-ohm termination resistor is present at both ends of the bus.

Package Includes: 1 x TJA1050 CAN Bus Transceiver Module

Frequently Asked Questions (FAQ)

• Is the TJA1050 a standalone CAN controller? No, it is a transceiver (Physical Layer). You still need a CAN controller like the MCP2515 or the internal CAN peripheral of an ESP32.
• Does it work with 3.3V microcontrollers? The VCC must be 5V, but it can usually interface with 3.3V logic (like ESP32) on the TXD/RXD pins, though a level shifter is recommended for long-term stability.
• What is the maximum speed? It supports up to 1 Mbps.
• Do I need the 120-ohm resistor? Yes, the CAN bus requires termination at both physical ends of the line to prevent signal reflections.
• How many nodes can I connect? The TJA1050 supports up to 110 nodes.
• Can I use this for OBD-II? Yes, it is the standard physical interface used in most OBD-II hardware.
• Is it compatible with CAN FD? No, the TJA1050 is designed for standard High-Speed CAN. For CAN FD, you need a TJA1441 or similar.
• Does it support "Silent Mode"? No, the TJA1050 does not have a dedicated silent mode pin like the TJA1051 or MCP2551.
• What is the difference between TJA1050 and MCP2551? They are functionally similar transceivers; the TJA1050 is often preferred for its slightly better EMI performance.
• Is there thermal protection? Yes, the chip will shut down if it exceeds safe operating temperatures to prevent failure.
• Can I use this for long-distance communication? Yes, CAN can reach up to 1km, though the bitrate must be reduced significantly (e.g., 50kbps).
• What wire should I use? Shielded twisted pair (STP) is best, but standard twisted pair (like Cat5e) works for most hobbyist projects.
• Is it 5V tolerant? Yes, the I/O pins are designed for 5V logic.
• Does it work with the Raspberry Pi? Yes, when used with a SPI-based CAN controller like the MCP2515.
• What happens if CAN_H and CAN_L are swapped? Communication will fail, but the transceiver is designed to survive short-circuits and wiring errors.
• Is it compatible with the ISO 11898 standard? Yes, fully compliant.
• Can I use it for a 24V vehicle system? The module requires 5V for power, but the CAN lines can handle the common-mode voltages typical in 24V systems.
• Does the module include the termination resistor? Most breakout boards include a 120-ohm resistor (R1); check if you need to remove it for middle-of-the-bus nodes.
• What is "Dominant Time-out"? It is a safety feature that prevents a faulty controller from "hanging" the entire bus by holding the TX line low.
• Is it original NXP silicon? We source only verified, high-performance silicon to ensure automotive-grade reliability.