AS8221 FlexRay™ IC

Description

The AS8221 is a high-speed automotive bus driver certified according to the FlexRay Electrical Physical Layer Specification V2.1 Rev B. The AS8221 operates as a bi-directional interface between the FlexRay Communication Controller and the twisted-pair copper wiring.

Ensuring application in safety critical environments a two wire bus-guardian interface is implemented where additional monitoring circuitries on the electronic-control-unit can activate and deactivate the transmitter and additionally on the receive enable output in low power modes the wake conditions and in normal power modes the received FlexRay streams can be monitored.

The product is available in RoHS conform SSOP20 package.

Key Features

• Data transfer up to 10 Mbps
• Compliant with FlexRay Electrical Physical Layer Specification V2.1 Rev. B
• Excellent EMC performances. High common mode range ensure excellent EMI
• Interface for Bus Guardian or supervision circuits
• Automatic thermal shutdown protection
• Supports 12V and 24V systems with low sleep current
• Integrated power management system
• - Two inhibit pins for external voltage supply control
• - Local wake-up input
• - Remote wake-up capability via FlexRay bus in low power modes
• Supports 2.5, 3, 3.3, 5 V microcontrollers and automatically adapts to interface levels
• Protection against damage due to short circuit conditions on the bus (positive and negative battery voltage)
• Operating temperature range -40ºC to +125ºC

Applications

The AS8221 FlexRay Standard Transceiver is best fitting for all automotive applications where the full functionality of the FlexRay bus driver is needed in the electronic-control-unit like bus wake-up and control for voltage supplies.

The device addresses all ECUs connected to the permanent battery supply (clamp30). The AS8221 is connected to the battery voltage and therefore can be used as the only ECU wake-up component with very low power consumption in sleep mode.

Block Diagram