AS8220A Datasheet, PDF (1/33 Pages) ams AG – FlexRay Basis Transceiver

AS8220A
F l e x R a y ^TM B a s i s Tr a n s c e i v e r
Objective
Data Sheet
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.
Figure 1. Block Diagram
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 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.
VIO
AS8220A
STBN
ERRN
VIO
Host
Controller
Interface
Bus
Failure
Detector
RxD
TxD
TxEN
Communi-
cation
Controller
Interface
Digital Logic
Transmitter
BP
BM
BGE
Bus
Guardian
Interface
Receiver
Power Supply
Interface
www.austriamicrosystems.com
Revision 17920-001-10a
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