CAN FD boost with CAN Signal improvement

October 22, 2021 // By Nick Flaherty
CAN FD boost with CAN Signal improvement
CAN signal improvement transceivers can boost the performance of CAN FD networks beyond 5Mbit/s and reduce cable lengths

NXP Semiconductors is ramping up production of a chip to boost the performance of CAN industrial and automotive networks.

The TJA146x CAN Signal Improvement Capability (CAN SIC) transceivers are being used in a Chinese car design to support larger, more complex networks and boost the achievable data rates by actively improving the CAN signal.

Changan Automobile is the first NXP automotive customer to incorporate the CAN SIC technology in production.

New functions have driven the need for increased data exchange in CAN networking systems that are reaching the limits of performance, CAN FD, a technology with higher bandwidth capability than classical CAN, increases bit rates from 500 kbit/s up to 5 Mbit/s but suffers from signal ringing that stems from signal reflection. This effectively limits the technology to 2 Mbit/s for many networks, restricting them to highly linear topologies.

This means wiring harnesses need to avoid long cable branches which results in more convoluted harness routes around the vehicle, adding cost and weight. The CAN Signal Improvement transceivers overcomes this signal integrity issues caused by ringing by actively improving the CAN signal, giving more flexibility in the placement of electronic control units, shorter cables, less weight, fewer connectors and easier network design.

The technology also extends the performance of CAN FD to enable data rates over Mbit/s on multi-node networks by using active signal enhancements and stricter timing. With these bandwidth improvements, CAN FD is expected to support a higher range of applications at a relatively low cost point.

“Since an early stage, Changan and NXP’s In-Vehicle Networking team cooperated on the implementation of CAN SIC in the ADAS system of Changan’s latest UNI-K model. The biggest challenge was to solve the interference problem caused by ringing,” said He Wen, Deputy General Manager of Changan Automobile Intelligent Research Institute.

“Repeated simulation, testing and verification proved that the CAN SIC technology is the most effective way to solve the ringing problem. The TJA146x CAN SIC transceivers allow us to increase the flexibility of the wiring harness layout and paves the way for future upgrade to higher speeds, such as 5Mbps. From the perspective of the entire project, it greatly improved the communications quality and engineering efficiency.”

“With our CAN Signal Improvement technology, carmakers can now create cost-efficient CAN FD networks with the freedom that their vehicle networks demand,” said Meindert van den Beld, VP and General Manager of NXP’s In Vehicle Networking Product Line. “We are delighted that Changan has embraced our TJA146x CAN SIC transceiver series for their new UNI-K model, rapidly adopting this technology into production.”

The TJA146x transceiver series are available as pin-compatible replacements to existing transceivers and comply both with the existing ISO11891-2:2016 CAN FD transceiver specification, as well as the new CiA601-4 Signal Improvement standard for backward compatibility with standard CAN transceivers.

www.nxp.com/CANSignalImprovement

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