Flexray Device Manages Communication Traffic

Austriamicrosystems has introduced the AS8223, a monolithic Flexray Standard V2.1 Rev B-compliant Active Star Device that manages communication traffic among four Flexray branches of the network. It is expandable to more branches through an Interstar interface. The four branches of the AS8223 operate as a Flexray receiver and transmitter, whereby one of the communication paths is operating as receiver while the others operate as transmitter.

Additionally, the AS8223 comes with a host controller interface to achieve active control of the power modes and error diagnosis. An autonomous mode is entered automatically, in which the device operates without the need for a host controller. A communication controller interface is also built into the AS8223 to provide the standard transceiver functionality on the ECU using the AS8223. The AS8223 Flexray Active Star Device is tailored for automotive gateways with embedded Flexray Active Star functionality. Connecting several devices at its Interstar interface enables extension of the Flexray branches to suit the needs of applications.

Features: very low asymmetric delay contribution; data transfer up to 10Mbps; enhanced bus error detection with current sensing on Flexray branches up to 8m from connector pins; low contribution to the Flexray network asymmetric delay. The AS8223 includes an automatic thermal shutdown protection and provides internal ESD protection at the bus pins for demanding automotive applications. The AS8223 Flexray Active Star Device is available in a 9 x 9mm 44-pin MLF package and operates over a temperature range of -40 to 125C with a power-supply range of 5.5 to 40V.

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