A
2
SI-E
Advanced AS-Interface IC
Features
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AS-i Complete Specification V2.11 compliant
Integrated EEPROM
Additional addressing channel using an opto-
electronic interface
Extended address mode operation as
programmable option (up to 62 slaves)
High impedance AS-i line input, additional pins
for further impedance optimizations
DC voltage output, approximately 24 volts, not
stabilized
5 volt DC voltage output, stabilized, CMOS
logic can be supplied directly (e.g. µC)
LED status indicator output (compliant with the
standard indication recommendation)
Integrated watchdog
Temperature range -25°C to + 105°C
Description
A²SI-E is a monolithic CMOS integrated circuit
certified for AS-i (Actuator Sensor-interface)
networks. AS-i networks are intended for industrial
automation.
The main advantage of AS-i solutions is that
actuators and sensors are connected using a two-
wire unshielded cable that is easy to install. This
cable transports both power and information/data.
AS-i network communication is based on the
master-slave principle. The network can be
extended (to cable lengths greater than 100m) by
using the A²SI-E in the repeater mode configuration.
Furthermore, the A²SI-E is used as slave interface
to sensors / actuators and as master interface.
AS-i is a standard for the automation industry based
on IEC 62026-2 and EN 50295.
The device is available in a 28-pin SOP (300 mils)
package.
Block Diagram
2.2
µF
24V
10
µF
U
IN
U
OUT
U5R
U5RD
OSC1/2
5V
8 MHz
CAP
C
CAP
A
2
SI-E
POWERFAIL
DETECTION
ELECTRONIC
INDUCTOR
POWER
SUPPLY
OSCILLATOR
R
CAP
4
RECEIVE
4
DOx
DIx
DSR
PST
TRANSMIT
4
Px
ASI+
ASIP
DIGITAL
LOGIC
ASI–
ASIN
THERMAL
PROTECTION
GND2
GND1
IRD
AMP
0V
GND
IRD
LED
FID
Copyright © 2002, ZMD AG Data Sheet, Rev. 1.2, October 21, 2002 Printed in Germany,
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The
Information furnished in this publication is preliminary and subject to changes without notice.
ZMD [ Zentrum Mikroelektronik Dresden AG ]
