MCP2515 CAN Bus Module TJA1050 Receiver SPI Module

MCP2515 CAN Bus Module TJA1050 Receiver SPI Module for Arduino AVR Description:
1, support CAN V2.0B specification, the communication speed 1Mb / S
2, 0 to 8-byte data field
3, the standard frame and expand the frame and remote frame
4. 5V DC power supply module, SPI interface protocol control
5, 120 ohm termination resistors. Impedance matching, ensure drive capacity, long-distance data transmission against signal radiation
6, module size: 4.4cm x 2.8cm screw hole center spacing 23mm x 38mm
7, the working current: typ. 5mA, 1 microamp standby current. Except the power indicator.

Wiring the Module

1. Power Connections:
   • Connect the module's VCC to a 5V supply.
   • Connect the module's GND to the Arduino's ground.
2. SPI Connections: The MCP2515 communicates with the microcontroller via SPI. Connect the pins as follows:
   • CS (Chip Select) → Any digital pin on the Arduino. You’ll define this pin in your code.
   • SCK (Clock) → Arduino’s SPI clock pin.
   • SI (Slave In) → Arduino's MOSI pin.
   • SO (Slave Out) → Arduino's MISO pin.
   • INT (Interrupt) → Any digital pin on the Arduino. This pin is optional but can be used for efficient message handling.
3. CAN Bus:
   • CAN_H: Connect to the CAN bus high line.
   • CAN_L: Connect to the CAN bus low line.
   • Use a twisted pair for the CAN_H and CAN_L lines to minimize noise.
   • Include a 120-ohm termination resistor across CAN_H and CAN_L at both ends of the CAN bus.

Things to Consider

1. CAN Speed: Ensure that all devices on the CAN bus operate at the same baud rate (e.g., 125 kbps, 250 kbps, or 500 kbps).
2. Termination Resistors: Place 120-ohm resistors at both physical ends of the CAN bus. Some modules include a built-in resistor that you can enable or disable via a jumper.
3. Power Supply: Ensure the module and the Arduino share the same ground, and the module receives a stable 5V supply.
4. Debugging: If the module doesn't work as expected, check:
   • SPI connections.
   • Correct initialization of the MCP2515.
   • Baud rate and configuration matching the CAN network.

Useful Links

• MCP2515 Datasheet

• TJA1050 Datasheet

• arduino-mcp2515 GitHub

• CAN protocol on Wikipedia

Useful Links Learn

• Build Your CAN Bus Skills

• MCP2515 CAN Bus Interface Module

• Arduino CAN Bus Tutorial | Interfacing MCP2515 CAN Module with Arduino

• MCP2515 CAN-BUS Arduino Tutorial – Getting started, Interfacing, Applications