General Description

This document is subject to change without notice. The AS8221 is a high speed automotive bus driver fully conforming 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.

Key Features

??Compliant with FlexRay Electrical Physical Layer Specification V2.1 Rev. B

??Data transfer up to 10 Mbps

??Excellent EMC performance. High common mode range ensure excellent EMI

??Interface for Bus Guardian or supervision circuits

??Automatic thermal shutdown protection

??Supports 12V and 24V systems with very 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 2.5V, 3V, 3.3V, 5V microcontrollers, automatic adaptation to digital interface levels

??Protection against damage due to short circuit conditions on the bus (positive and negative battery voltage)

??Operating temperature range -40oC to +125oC

??Lead-free SSOP20 package

Applications

The AS8221 FlexRay Standard Transceiver is best fitting for automotive FlexRay nodes where bus wake-up and voltage regulator control for voltage supplies is needed.

The device addresses all ECUs connected to the permanent battery supply (clamp 30). The AS8221 can be used as only ECU wake-up component with very low power consumption in SLEEP mode.