Code: 12643-103-00a

Page 1 of 2

AS8221

High Performance Bus Transceiver

PRODUCT BRIEF

General Description

The AS8221 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 communications

with the microcontroller with full mode handling,

including the low-power modes.

Package: lead-free SSOP20

Functional Description

Transmission rates up to 10 Mbps 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.

Applications

-

FlexRay™ networks

-

High speed automotive bus systems

-

Backbone bus and gateways

-

Safety critical applications

-

X-by-wire systems

-

Redundant bus systems

-

Bus topologies with active stars

Key Features

-

Data transfer up to 10 Mbps

-

Supports 2.5, 3, 3.3, 5 V microcontrollers and

automatically adapts to interface levels

-

Does not disturb the bus line when un-powered

-

Fail silent behaviour

-

Protection against damage due to short circuit

conditions on the bus (positive and negative

battery voltage)

-

Supports 12, 24, 42 V systems with low sleep

current (30 µA)

-

Integrated power management system

o

Two INH pins for the external voltage

o

Local wake-up input via STBN-, WAKE- and

TxD-Pins

o

Remote wake-up capability via FlexRay™ bus

in sleep mode

-

Operating temperature range -40°C to +125°C

-

Compliant with FlexRay™ Electrical Physical Layer

specification

-

Excellent EMC performance

-

High common mode range insure

excellent

signal

integrity

on

diverse bus topologies

-

Bus guardian Interface for optional

bus supervision

-

Automatic

thermal

shutdown

protection