ASI4U / ASI4U-E / ASI4U-F

Spec. 3.0 Compliant Universal AS-I IC

© 2012 Zentrum Mikroelektronik Dresden AG— Rev. 2.2

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Brief Description

ASI4U is a new generation CMOS integrated circuit

for AS-I networks.

The low-level field bus AS-I (Actuator Sensor

Interface) was designed for easy, safe and cost-

effective interconnection of sensors, actuators and

switches. It transports both power and data over the

same two-wire unshielded cable.

ASI4U is used as a part of a master or slave node

and works as an interface to the physical bus. The

device realizes power supply, physical data transfer

and communication protocol handling. ASI4U is fully

compliant with AS-I Complete Specification 3.0 and

functioning and PIN compatible with the A²SI IC.

All configuration data are stored in an internal

EEPROM that can be easily programmed by a

stationary or handheld programming device. The

special AS-I safety option assures short response

times regarding security related events.

Features

 Compliant with AS-I Complete Specification V3.0

 Universal application: in slaves, masters,

repeaters and bus-monitors

 Compatible with A²SI

 Floating AS-I transmitter and receiver for high

symmetrical high power applications

 On-chip electronic inductor with current drive

capability of 55 mA

 Two configurable LED outputs to support all Spec.

V3.0 status indication modes

 Several data pre-processing functions, including

configurable data input filters and bit selective

data inverting

 Additional addressing channel for easy wireless

module setup

 Support of 8 / 16 MHz crystals by automatic

frequency detection

 Special AS-I safety option

 Clock watchdog for high system security

Benefits

 Flexible, separated I/Os

 Flexible AS-I Bus adoption (isolated transceiver)

 Very small package SSOP 28 (ASI4U)

 Supports AS-I complete Specification V3.0

 Supports high ambient temperature applications

(ASI4U-E)

Available Support

 ZMDI AS-Interface Programmer Kit USB

 ZMDI ASI4U Evaluation Board V2.0

Physical Characteristics

 Operational temp. range: -25 to +85°C (ASI4U)

 Operational temp. range: -40 to +85°C (ASI4U-F)

 Operational temp. range: -25 to +105°C (ASI4U-E)

 SSOP28 (ASI4U) / SOP28 (ASI4U-E) package

ASI4U Basic Application Circuit

+24V

+0V

ASI+

ASI-

+24V

+0V

ASI+

ASI-

ASI4U

GND

0V

U5R

CAP

ASIN

ASIP

OSC2

OSC1

UIN

UOUT

FID

DI0...3

DO0...3

DSR

P0...3

IRD

LED2

LED1

PST

ASI4U

GND

0V

U5R

CAP

ASIN

ASIP

OSC2

OSC1

UIN

UOUT

FID

DI0...3

DO0...3

DSR

P0...3

IRD

LED2

LED1

PST

Standard Application

Extended Power Application with IR-Addressing Option