Getting ready for the demand it expects to see for high speed automotive networks based on FlexRay, austriamicrosystems AG has just released its AS8221 bus transceiver.
According to Bernd Gessner, General Manager Automotive at austriamicrosystems, the AS8221 supports baud rates of up to 10 Mbit/sec, ten times the bandwidth available on a CAN-based network, as well as the Bus Guardian interface, enabling fault tolerant and hard real-time applications.
Serving as the bidirectional interface between the FlexRay Communication Controller and the twisted pair copper wires, the device enables two-way communications with the microcontroller (FlexRay Host Controller) with full mode handling, including the low-power modes. The device also provides an extended diagnostic interface.
The AS8221 offers advanced bus-failure detection capabilities with the intelligent combination of bus-current measurement and logical comparators. A thermal sensor circuit with an integral shutdown mechanism prevents damage to the device in over-temperature conditions.
A symmetrical transient control for the high- and low-side driver for both the bus-minus and bus-plus line has been included to balance communications over different network-topologies.
The first generation of automotive-qualified AS8221 is available in a lead-free SSOP20 package. Qualified samples of the next generation FlexRay Electrical Physical Layer specification V2.1 Rev A will be available in December.
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