Comparison between CAN transceivers TJA1050 and MCP2551

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Comparison between CAN transceivers TJA1050 and MCP2551 [Copy link]

At present, the most widely used CAN transceivers in the world are the various transceivers of NXP (formerly Philips Semiconductors). Not to mention some of the past PCA82C250/251, they have been widely used in many occasions. Through process transformation and technological innovation, Philips launched two upgraded CAN transceivers, TJA1050 and TJA1040, a few years ago. They have also been widely used in various occasions. MCP2551 is a CAN transceiver produced by MSI. It is also used in the market to a certain extent, but its popularity is far less than that of TJA1050. These two chips are new transceivers, but why is there a one-sided situation? The following is a comparison from some important aspects (TJA1040 performance is much higher than MCP2551, so no comparison is made): 1. Minimum baud rate: In order to prevent the MCU's TXD pin from being at a low level for a long time, thereby affecting the bus, the new CAN transceiver has a maximum bit limit, that is, a minimum baud rate limit. Under stable operation, TJA1050 usually supports a baud rate of more than 60K (minimum support 20K), while MCP2551 supports a baud rate of more than 16K (minimum support 5K). It can be said that TJA1050 can cut off the error signal faster when the bus is wrong to ensure normal communication, which is very important in automotive electronic communications. (The baud rate in the car is generally 100K, 125K, 250K) 2. Compatibility, TJA1050 is compatible with the previous PCA82C250 transceiver, while MCP2551 cannot work in the PCA82C250 system (I have tested that when there are about 8 nodes, mixing MCP2551 and PCA82C250 cannot communicate). However, TJA1050 is compatible with the MCP2551 system. Therefore, the compatibility of using TJA1050 is very good. 3. EMC performance: TJA1050 uses automatic slope control, even if the output level has extremely low electromagnetic radiation, while MCP2551 is the same as the previous PCA82C251, requiring users to adjust the slope through the baud rate to allow EMI to pass. TJA1050 is more convenient to use. 4. Output symmetry: TJA1050 has excellent output symmetry, so even without adding common mode coil, it has strong anti-common mode interference ability. One of my customers has tested it and found that TJA1050's performance in group pulse test is 5% higher than MCP2551.