Automotive

The world’s first dual FlexRay star coupler

8th October 2012
ES Admin
0
With the component E981.57, ELMOS introduces the first dual FlexRay star coupler available in series production worldwide, thus completing the FlexRay family. The IC has passed certification according to the latest FlexRay Electrical Physical Layer (EPL) specification V3.0. The E981.57 meets the car manufacturers’ requirements with respect to electromagnetic compatibility (EMC) and electrostatic discharge (ESD).
With the active star coupler up to two branches of a FlexRay™ network can be connected to each other. For this purpose, the ELMOS component provides two independent physical bus drivers for transmitting and receiving FlexRay™ data frames. Configuration and microcontroller-based mode control as well as the exchange of diagnostic information make use of the SPI compatible host controller interface. The also implemented interface connected to a communication controller makes it possible to use the component E981.57 as a standard transceiver. Apart from that, autonomous operation with the star coupler functioning as a repeater is possible entirely without connection to a controller.

With its two channels, the E981.57 represents the entry-level model. ELMOS also offers a four-port star coupler (E981.56). The four-port star coupler is available in the same package. Thus ELMOS customers have the opportunity to set up layout systems with 2/4/6/8 combinations on the same circuit boards and assemble them as required. If only one channel is needed, the E981.55 FlexRay™ transceiver can be used. A large number of options for scaling the FlexRay™ network are therefore made available. All FlexRay™ transceivers referred to here feature “wake-up” functionality.

The component E981.56/57 comes in a QFN package of 9mm edge length with 44 pins. It is designed for a temperature range between -40°C and +125°C and a supply voltage range of 5.5 V to 18 V. Qualification according to AEC-Q100 has been completed successfully.

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