A²SI™
Advanced AS-Interface IC
Data Sheet
1
Features
2
AS-i Complete Specification V2.11 compliant
Description
A²SI™ is a monolithic CMOS integrated circuit
certified for AS-i (Actuator Sensor-interface)
networks. AS-i networks are intended for industrial
automation.
Integrated EEPROM
Additional addressing channel using an optoelectronic 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 to the
standard indication recommendation)
Integrated watchdog
The main advantage of AS-i solutions is that
actuators and sensors are connected using a twowire unshielded cable that is easy to install. This
cable transports both power and information/data.
AS-i network communication is based on the masterslave principle. The network can be extended (to
cable lengths greater than 100m) by using the A²SI™
in the repeater mode configuration.
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 SSOP package.
3
Block Diagram
1 µF
5V
24V
8 MHz
10 µF
U IN
CAP
A2SI™
U OUT
U5R
ELECTRONIC
INDUCTOR
U5RD
POWER
SUPPLY
OSC1/2
OSCILLATOR
POWERFAIL
DETECTION
ASI+
ASI–
4
4
ASIP
DIGITAL
LOGIC
DIx
DSR
PST
ASIN
TRANSMIT
THERMAL
PROTECTION
GND2
4
GND1
0V
GND
Figure 1: Block Diagram
Revision 2.2
June 2001
Pages (total): 28
DOx
RECEIVE
1
IRD
AMP
IRD
LED
FID
Px