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High-speed CAN transceiver integrates galvanic isolation

NXP (Netherlands) has launched the TJA1052i transceiver chip featuring AEC-Q100 automotive grade quality. The CAN transceiver complies with ISO 11898-2 and provides on-chip galvanic isolation. It has been developed for hybrid and electric vehicles, but can also be used in non-automotive applications.

THE INTRODUCED TRANSCEIVER IS SUITABLE for all CAN networks, where high- and low-voltage networks co-exist. Typical applications include hybrid and electric cars, which are equipped with multiple battery modules. Such systems are controlled typically via CAN by the battery management system, which together can supply up to 500 VDC and power other high-voltage applications such as inverter, start/stop, DC/DC converter, charger, and air-conditioning systems. Isolated CAN products are also needed in industrial applications, where devices control high-voltage systems and need to be connected to each other. Application examples for the TJA1052i in non-automotive areas are industrial equipment, energy storage systems, building automation, and charging stations.
Adding isolation to the CAN transceiver simplifies the design effort to safely bridge between high- and low-voltage levels. The chip provides protection against electric shocks, overvoltage, ground offset, and reverse current, while improving signal integrity in noisy electromagnetic environments. By integrating an existing market accepted CAN transceiver with a galvanic isolator in one package, this solution ensures matching dynamic parameters, reduces board space, improves signal performance, and increases overall reliability and cost-effectiveness. Historically, automotive OEMs and Tier 1 suppliers have used expensive opto-couplers to isolate the CAN transceiver, with performance in such a standalone solution tending to degrade over time.
“The TJA1052i is another great example of NXP’s strategy to both connect the car and improve energy efficiency – even under challenging conditions,” said Toni Versluijs, NXP’s vice-president and general manager, in-vehicle networking business. “Our third-generation automotive CAN transceivers are already approved and used by multiple OEMs. By integrating galvanic isolation into the TJA1052i, we are first in the industry to deliver an automotive-grade solution that saves both space and money, while making it easier for our customers to build and connect their ECUs.”

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