AS8220_07 datasheet(2/34 Pages) AMSCO

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AS8220A

FlexRayTM Basis Transceiver

Objective

Data Sheet

www.austriamicrosystems.com

Revision 17920-001-10a

1 - 33

1 General Description

This objective data sheet describes the intended

functionality of the AS8220A bus transceiver. As long

the device is not fully qualified, the parameters are not

characterized in the means that parameters may change

or can be updated during final product qualification and

characterization. This document shows the objective of

the AS8220A and this document is subjected to change

without notice.

The AS8220A is a high-speed automotive transceiver

for fault tolerant and high speed applications, operating

as the bi-directional interface between a generic

communication controller and the twisted pair copper

wires. The device enables two-way communication with

the microcontroller with full mode handling, including the

low-power modes.

The transmission rates up to 10Mbps as well as the

implemented Bus Guardian interface enables this

transceiver the usage in fault tolerant and hard real-time

applications in the stringent automotive environment. An

extended diagnostic interface, 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 extreme

temperature conditions. The symmetrical transient

control for the high- and low-side driver for both the bus-

minus and bus-plus line allows an ideal balance of

communications over different network topologies, with

excellent EMC performance. The product is available in

SSOP14 package.

2 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 insure excellent EMI

Enable pin for an optional bus guardian

Automatic thermal shutdown protection

Low standby current

Supports 2.5, 3, 3.3, 5 V micro controllers 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

3 Applications

The device is ideal for

Figure 1. Block Diagram

Host

Controller

Interface

Bus

Failure

Detector

Communi-

cation

Controller

Interface

Bus

Guardian

Interface

Power Supply

Interface

Receiver

Transmitter

Digital Logic

AS8220A

STBN

ERRN

RxD

TxD

TxEN

BGE

VIO

high speed automotive bus

systems, backbone bus and gateways, X-by-wire

systems, redundant bus systems, bus topologies with

Active Stars, and safety critical applications. Designed

for FlexRay, where the basic features are demanded.

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