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Beetle said yes to Mantis

Volkswagen has approved the Mantis CAN transceivers by NXP for use in its vehicles. The products don’t require common-mode chokes, which reduces the costs of the CAN interface.

All members of the Mantis family are dual-sourced from wafer fabs in the Netherlands and Singapore; they are compliant with ISO 11898-2 (TJA1044T) and ISO 11898-5 (TJA1044GT) (Photos: NXP)


WITH INCREASING FUNCTIONS BEING INTRODUCED into the car, the performance of a modern IVN (in-vehicle network) becomes increasingly critical to the vehicle's safe and reliable operation, with electro-magnetic emission and immunity against electro-magnetic interference being critical parameters to control. Therefore, carmakers define strict specifications, which all transceivers must adhere to before being approved for use in the vehicle. Traditionally, a common-mode choke has been required to reach the performance limits of the application, creating an additional cost of approximately 10 to 15 US-cents (USD) per interface.

After evaluating the NXP transceiver without using common-mode chokes with bit-rates up to 500 kbit/s, Volkswagen, the father of the Beetle, agreed to implement the Mantis chips in future cars. Besides saving costs, this also reduces required space and allows greater ECU design flexibility. The transceivers are compatible with 3,3-V and 5-V micro-controllers. The maximum voltage on the CAN pins is specified for ±42 V. On the bus-pins 6-kV ESD can be handled. The chips comply with the requirements jointly developed by German carmakers ("Hardware Requirements for LIN, CAN and FlexRay Interfaces in Automotive Application - Audi, BMW, Daimler, Porsche, Volkswagen - Revision 1.3 / 2012")

Carsten Schanze, physical layer expert at Volkswagen, commented: "Volkswagen adheres to the strictest EMC requirements in the industry, a critical performance criteria to ensure reliable communication of modules within the car network. We, together with the other major German car manufacturers, can only accept devices in our vehicles that fulfill these requirements. In approving NXP's Mantis transceivers, we undertook an extended testing process. Mantis transceivers are the first devices that delivered the performance for the chokeless use in our car networks and were even used to define the requirements for the location of chokeless networks in the vehicle."

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