Southchip announced the launch of the automotive-grade high-speed CAN/CAN FD transceiver SC25042Q. This transceiver is designed for 12V and 24V automotive systems and can directly connect to microcontrollers operating at 3V-5V. It supports data transfer rates of up to 5Mbit/s. SC25042Q integrates ringing suppression functionality, offers strong resistance to electromagnetic interference, and enables lossless time transmission, ensuring efficient and reliable signaling. The product has passed the AEC-Q100 certification and complies with ISO 11898-2:2016 and SAE J2284-1 to SAE J2284-5 standards, providing a high-performance, cost-effective domestic alternative for automotive-grade interface chips.
Domestic Product for CAN Bus in Vehicles
As the number of sensors and actuators in intelligent vehicles increases, data transmission needs are growing exponentially. This has set higher requirements for the stability, data transfer rate, and security of in-vehicle networks. The CAN (Controller Area Network) bus, which uses differential signaling, is widely employed in automotive network systems due to its high reliability, real-time performance, and strong resistance to interference. The emergence of CAN FD technology has further enhanced the data transfer rate and flexibility of CAN buses, making them better suited to the big data processing needs of intelligent vehicles.
However, with the increase in signal rate and network topology complexity, existing CAN transceivers face many challenges in system reliability: the receiving end may experience signal ringing and pulse width loss, leading to data transmission errors. To address these issues, Southchip has introduced the SC25042Q, which not only achieves ringing suppression and ultra-low-loss signal pulse width to ensure the reliability of high-speed communication systems but also realizes full domestication from raw materials, design to manufacturing processes.
Intelligent Design for Signal Consistency
In CAN networks with multiple nodes, when the bus signal transitions from dominant to recessive state, impedance mismatch can occur due to the sudden change in differential impedance, causing oscillations at the receiving end, known as ringing. Ringing can prevent the receiving end from correctly identifying the signal sampling point (SP), leading to data bit misjudgment and increasing signal noise levels, thereby reducing system reliability. SC25042Q is equipped with built-in ringing suppression circuits that can automatically adjust load impedance, significantly enhancing communication reliability and allowing higher communication rates in complex network topologies.
Practical tests have shown that for the same SIC (Signal Improvement Capability) test signal, the received signal of a typical CAN transceiver (right) exhibits two oscillation peaks, showing obvious ringing phenomena; whereas the received signal of SC25042Q (left) maintains signal consistency and symmetry.
In addition, SC25042Q can achieve extremely low transmission pulse width loss, ensuring that data sampling at the receiver end is error-free and guaranteeing the reliability of signal transmission while reducing the bit error rate. Tests have shown that at a communication rate of 5Mbit/s, the signal period offset of SC25042Q is only 0.5% (decreasing from 200ns to 199ns), which is just 1/30th of that of a conventional CAN transceiver. Under the bit stuffing mechanism, the cumulative time error is extremely small, thereby ensuring the accuracy of the SP and reducing the probability of error frames in the system.
High Cost-Effectiveness for Diverse Needs
Given the wide application of CAN transceivers in automotive networks and the diverse scene requirements, SC25042Q demonstrates greater flexibility and brings convenience to customers' system design:
Suitable for mainstream 12V and 24V automotive systems
Directly connects to microcontrollers operating at 3V-5V, perfectly matching most automotive MCUs
Available in SOP8 and lead-free DFN8 package options to meet different application needs
