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Electronica 2016

CAN FD transceivers with 5 Mbit/s

Infineon (Germany) speeds up in-vehicle communication and now provides the TLE925x CAN FD transceivers. They come in a 3 mm x 3 mm package.

The CAN FD transceivers TLE925x speed up in-vehicle communication; their TSON-8 package measures 3 mm x 3 mm (Photo: Infineon)

Around 60 electronic control units communicate with each other in vehicles today via CAN. The need for in-vehicle communication is growing as the amount of networking increases and more comfort and automation are implemented. The protocol variant CAN FD allows a higher data bandwidth and transmission speed. This saves time in programming, in tests, and diagnostic routines as well as for software updates over the air (Sota).

With its TLE925x CAN FD transceivers, Infineon Technologies makes data exchange up to 30 times faster. The TLE925x reaches transmission speeds of up to 5 Mbit/s. Compared to the Classical CAN transceivers with a maximum of 8 byte, the CAN FD transceivers such as TLE925x can send a payload of up to 64 byte per message. This opens up the possibility to check the transmitted data for consistency in the transmitting control unit and to sign it with a 21-bit checksum instead of the 17-bit possible so far. Longer checksums ensure reliable communication between the control units. This makes it possible to better secure data transmission in the vehicle without the application software becoming more complex in the electronic control unit.

These CAN FD transceivers can be used, for example, in body control modules and gateways, in power steering, engine, and transmission control units, as well as in radar and camera-based driver assistance systems. On average, vehicles today have 17 CAN transceivers. The number should rise to more than 20 within the next five years. The CAN FD transceivers permit an interface voltage to the micro-controller of 3,3 V as well as 5 V for best-possible signal symmetry. The more symmetrical the signals are, the better the electromagnetic compatibility (EMC) is.

Compared to the previous CAN generation, Infineon has improved the robustness of the CAN FD transceivers to electromagnetic interference (EMI) in the frequency range of 1 MHz to 1 GHz. The electromagnetic emission (EME) of the transceivers between 150 kHz and 1 GHz is lower than in any other CAN transceiver available today, says the company. At the same time the CAN FD transceivers pass electrostatic discharge tests (ESD) of at least ±8 kV according to IEC 61000-4-2.

Infineon offers a portfolio of products for a variety of bus segments such as CAN FD, CAN with partial networking, high-speed CAN, LIN, and Flexray. For the protocol variant CAN FD with 5 Mbit/s, Infineon offers – apart from the TLE925x transceivers compliant to ISO11898-2:2016 – the matching system basis chips in the TLE9278 Multi-CAN Power-SBC family. The TC3xx multicore micro-controllers in the Aurix family have up to 12 CAN FD channels according to ISO 11898-1:2015.

The CAN FD transceivers in the TLE925x family are already available in sample quantities. They are delivered in the RoHS-compatible standard package DSO-8 or in the package TSON-8 with dimensions of 3 mm x 3 mm. Volume production is due to start in February 2017. The CAN FD transceivers are compatible with the present Classical CAN transceivers. Infineon will present the CAN FD transceivers at the Electronica 2016 from November 8 to 11 in Munich, Germany in hall A5 at booth 506.

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