Item specifics
Description
TJA1050 CAN transceiver module for high-speed CAN bus communication, up to 1Mbps. 5V power supply, 3.3V logic compatible. 51 MCU code example included. Ideal for automotive electronics, industrial control, CAN bus debugging, robot communication. Plug-and-play for easy development
TJA1050 CAN Bus Module Application features:
◆ Main Chip
TJA1050 high-speed CAN transceiver
◆ Communication Protocol
CAN 2.0A / 2.0B
◆ Data Rate
Up to 1 Mbps
◆ Interfaces
CAN_H / CAN_L (bus side)
TXD / RXD (controller side)
◆ Supply Voltage
4.5V – 5.5V
◆ Logic Level
3.3V / 5V compatible (TXD/RXD)
◆ Protection Features
ESD protection on bus pins
Thermal protection
Short circuit protection
◆ Typical Applications
Automotive electronics communication
Industrial fieldbus
CAN bus debugging tools
Robot control systems
Sensor networks
51/STM32/Arduino CAN expansion
◆ Key Advantages
High-speed transmission (1Mbps)
Low electromagnetic emission
Multi-node support (up to 110 nodes)
51 MCU code example provided
Compatible with mainstream MCUs
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FAQ
1. What is the TJA1050 CAN Bus Module?
The TJA1050 is a high-speed CAN transceiver from NXP that serves as the interface between the CAN protocol controller and the physical bus. In simple terms, it converts the microcontroller's TTL-level "0" and "1" into differential voltage signals on the CAN bus for transmission, and converts differential signals from the bus back to TTL levels for the microcontroller to receive. It is typically used with a CAN controller such as the MCP2515 or SJA1000.
2. What hardware is needed to use the TJA1050 module with a 51 MCU?
A typical configuration includes: a 51 MCU (e.g., STC89C52, STC16F), a CAN controller (e.g., MCP2515 or SJA1000), a TJA1050 transceiver module, a 5V power supply, twisted-pair wires (as the CAN bus), and two 120Ω termination resistors. There are also integrated CAN bus modules that combine the MCP2515 and TJA1050 on a single board, connecting to the 51 MCU via the SPI interface.
3. How is the TJA1050 module connected to a 51 MCU?
Using the common MCP2515+TJA1050 module as an example: Module to 51 MCU connections: VCC→5V, GND→GND, CS→P1.3 (SPI chip select), SO(MISO)→P1.2, SI(MOSI)→P1.1, SCK→P1.0. TJA1050 to CAN bus connections: CANH→CAN_H wire, CANL→CAN_L wire. Additionally, pin 8 (RS pin) of the TJA1050 must be connected to GND for the chip to function properly.
4. What communication rates does the TJA1050 module support?
The TJA1050 supports baud rates ranging from 60 kbaud to 1 Mbaud. The actual rate is configured by the CAN controller (e.g., MCP2515) through its timing registers. Specific configurations depend on project requirements, including settings for the Baud Rate Prescaler (BRP) and time segments (TSEG1/TSEG2).
5. How does a 51 MCU perform CAN communication using the TJA1050?
Since the 51 MCU does not have a built-in CAN controller, an external CAN controller chip (such as MCP2515 or SJA1000) is required. Programming involves the following steps: ① SPI initialization (configure SCK, MOSI, MISO, CS pins); ② MCP2515 initialization (enter configuration mode, set baud rate, filters, and interrupts); ③ Data transmission (write identifier, data length, and data content to the transmit buffer); ④ Data reception (read the receive buffer and parse the message). Sample routines are available online.
6. What is the operating temperature range of the TJA1050 module?
The TJA1050 module has an industrial-grade operating temperature range of -40℃ to +85℃, with typical operating current of 5mA and standby current of 1μA. Some modules also feature over-temperature protection and TXD dominant timeout protection functions.
7. Why are 120Ω termination resistors needed for CAN bus communication?
A 120Ω termination resistor must be placed at each end of the CAN bus to eliminate signal reflections and ensure stable long-distance data transmission. Most TJA1050 modules come with built-in termination resistor jumpers that can be enabled by shorting the jumper. However, note that if the module already has a 120Ω termination resistor built in, the termination switch on the analyzer should be turned off; otherwise, duplicate termination will occur, causing abnormal bus levels.
8. How do TJA1050 and MCP2515 divide their work?
MCP2515 is the CAN protocol controller, responsible for CAN protocol parsing, message assembly, filtering, and error handling. TJA1050 is the CAN transceiver, responsible for physical layer signal conversion (differential signal ↔ TTL level). They work together: MCP2515 "speaks" (protocol processing) while TJA1050 "delivers the message" (level conversion).
9. What are common communication issues with the TJA1050 module and how to fix them?
Common issues include: ① SPI communication failure: Check if the CS pin is pulled low, confirm SPI mode is correct (MCP2515 defaults to Mode 0), and use an oscilloscope to check SCK/MOSI signals; ② CAN bus communication failure: Check if the TJA1050 has proper 5V power, if the RS pin is grounded, and if termination resistors are correctly configured; ③ Transmission works but reception fails: Check if the filter configuration is correct; ④ Loopback mode testing: Test the CAN in loopback mode first to verify if the issue is with configuration or the bus线路.
10. What are alternative models to the TJA1050 module?
Alternative high-speed CAN transceivers in the same category include TJA1040, TJA1042, TJA1051T/1J, and P82C250. The TJA1051 is a 3rd-generation upgrade of the TJA1050, supporting CAN FD (up to 5Mbps) with improved EMC and ESD performance.