Function of CAN Transceiver
2 Answers
CAN transceiver serves as the bridge connecting the CAN control system with the CAN bus network. What parameters should be considered when selecting a CAN transceiver? This article will provide an in-depth understanding of each parameter of the transceiver and its significance in practical applications. Depending on the CAN interface voltage of the controller, you can choose a CAN module powered by 3.3V or 5V. The normal input range for an isolated CAN module is VCC±5%, mainly ensuring that the CAN bus voltage remains within the typical range while also allowing the secondary CAN chip to operate near its nominal supply voltage. For standalone CAN transceiver chips, the VIO pin of the chip needs to be connected to a reference voltage matching the TXD signal level to align the signal levels. If there is no VIO pin, the signal level should be kept consistent with VCC. When using the CTM series isolated transceivers, it is necessary to match the TXD signal level with the supply voltage, i.e., a 3.3V standard CAN controller interface or a 5V standard CAN controller interface.
To put it simply, a CAN transceiver is essentially the bridge that enables communication between various electronic devices in a vehicle. I often encounter it during repairs—for instance, when the engine control unit and braking system need to exchange data, the transceiver converts digital signals into voltage signals usable by the vehicle for transmission. Without it, the car's 'brain' would malfunction, such as failing to issue warnings when engine RPM gets too high, which is no small matter. I've seen many cases where a faulty transceiver causes the dashboard to stop displaying data, making repairs quite troublesome. Essentially, it acts like an interpreter, ensuring messages are transmitted accurately, especially at high speeds. If data packets are lost, the system might misjudge and trigger an accident. That's why I recommend regular checks on bus connections—don't wait until the problem escalates. Sharing this experience to help others avoid costly repairs down the road.
