Brief Description

The ASI4U is a next-generation CMOS integrated

circuit for AS-i networks. This 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.

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

and functions as an interface to the physical bus. It

provides the power supply, physical data transfer,

and communication protocol handling. The ASI4U is

fully compliant with the AS-Interface Complete

Specification V3.0. It is function 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 for security-related events

Features

• Compliant with AS-Interface Complete Specification V3.0

• Universal application: slaves, masters, repeaters,

and bus-monitors

• Floating AS-i transmitter and receiver for highly

symmetrical high-power applications

• On-chip electronic inductor with current drive

capability of 55 mA

• Two configurable LED outputs to support all

AS-Interface Complete Specification 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 and 16 MHz crystals by automatic

frequency detection

• Special AS-i safety option

• Clock watchdog for high system security