Description

The AS8224 is the world-wide first FlexRay™ compliant Active Star device featuring a Bit-Reshaper to correct the asymmetric propagation delay in a FlexRay network. The Bit-Reshaper enables the design of network topologies to increase significantly and enables the usage of cheaper wiring.

The device manages communication traffic between the communication controller interface and four FlexRay branches. It's also expandable to more branches through an Interstar interface.

One of the communication paths is operating as receiver while the others operate as transmitters. The four branches of the AS8224 consist of a FlexRay™ receiver and transmitters which support the bus wake-up function.

Additionally, the AS8224 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.

The FlexRay™ Active Star Device is available in MLF 9x9 44 pin package.

주요 특징

• Bit-Reshaper to correct asymmetric propagation delays
• Active Star device with 6 communication paths (four FlexRay branches, Communication Controller Interface and Interstar interface)
• Message forwarding upon all communication paths
• Data transfer up to 10 Mbps
• Compliant with FlexRay Electrical Physical Layer Specification V2.1 Rev B
• Excellent EMC performance
• Low susceptibility to EMI
• High end diagnostic capabilities for detecting faults on the bus lines
• Interface with bus guardian for bus supervision
• Automatic thermal shutdown protection
• Supports 12V and 24V systems with very low sleep current
• Two INH pins for the external voltage regulators control
• Remote wake-up capability through the FlexRay branches and local wake-up pin
• Supports Autonomous Power Mode and Host Controlled Power Mode management
• Supports 2.5, 3, 3.3 and 5 V microcontrollers and automatically adapts to interface levels
• VCC supply voltage buffer for fail-safe conditions
• Protection against damage due to short circuit conditions on the FlexRay branches (positive and negative battery voltage)
• Operating ambient temperature range -40°C to +125°C
• MLF 9x9 44 pin package (RoHS conform)

적용분야

The AS8224 FlexRay™ Active Star Device with Bit-Reshaper is tailored for second generation in-vehicle networks with extended topologies and network layouts as well the reduction of material costs with low-cost wiring.

With its correction mechanism for the asymmetric propagation delays the device is perfectly suits for application where long wiring distances are required like trucks, freighters and big off-road vehicles.

Block diagram for AS8224 FlexRay IC