Datasheet

ZENTRUM MIKROELEKTRONIK DRESDEN AG

“ASI for you” IC

Copyright © 2006, ZMD AG, Rev.1.4

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.

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SAFETY-ADVICE

0.1 Important Notice

Products sold by ZMD are covered exclusively by the warranty, patent indemnification and other provisions ap-

pearing in ZMD standard "Terms of Sale". ZMD makes no warranty (express, statutory, implied and/or by de-

scription), including without limitation any warranties of merchantability and/or fitness for a particular purpose,

regarding the information set forth in the Materials pertaining to ZMD products, or regarding the freedom of any

products described in the Materials from patent and/or other infringement. ZMD reserves the right to discontinue

production and change specifications and prices of its products at any time and without notice. ZMD products

are intended for use in commercial applications. Applications requiring extended temperature range, unusual

environmental requirements, or high reliability applications, such as military, medical life-support or life-

sustaining equipment, are specifically not recommended without additional mutually agreed upon processing by

ZMD for such applications.

ZMD reserves the right to change the detail specifications as may be required to permit improvements in the

design of its products.

0.2 ASI-Safety Applications

The ASI4U is designed to allow replacement of A²SI ICs in existing board layouts and applications. However,

since the ASI4U provides additional data preprocessing functions at the data input channel, the fault reaction

time of an AS-i Safety module could increase by 40ms if some of the new features become activated by inten-

tion, by accident or hardware fault.

ZMD strongly recommends the use of the new ASI4U Safety-Mode, if the ASI4U shall replace the A²SI in exist-

ing ASI-Safety designs. Only then, the same fault reaction times as with the A²SI are guaranteed. For compati-

bility with the modified data input routing in Safety Mode, the user has to adapt the safety code table stored in

the external micro controller. Only such Safety Code Sequences that contain the value 1110 are permitted.

If the IC is operated in Safety Mode, the user must pay special attention that the Synchronous Data I/O Mode as

well as the Data Input Filters remain disabled by appropriate E²PROM configuration.

Application of the ASI4U in Standard Mode (no Safety Mode enabled) for AS-i Safety products is basically pos-

sible, if an additional Fault Reaction Time of 40ms is taken into account.

The user shall also obey the additional security advice regarding “Production and Repair of AS-i Safety Slaves”

that is available as an additional document form the ZMD web page www.zmd.biz .

0.3 Repair of ASI-Safety Modules

If an A²SI based ASI-Safety Module shall be repaired, it is explicitly prohibited to replace the A²SI IC with the

newer ASI4U IC. This is to exclude safety relevant deviations of module properties that can result from the dif-

ferent data input paths an the above mentioned possible increase in Fault Reaction Time.

The user shall also obey the additional security advice regarding “Production and Repair of AS-i Safety Slaves”

that is available as an additional document form the ZMD web page www.zmd.biz .