ASI4U datasheet(9/64 Pages) ETC2

9 / 64 page

ASI4U / ASI4U-E / ASI4U-F

Spec. 3.0 Compliant Universal AS-I IC

Data Sheet

April 2, 2012

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

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0.1. Important Notice

Products sold by Zentrum Mikroelektronik Dresden AG (ZMDI) are covered exclusively by the warranty, patent

indemnification and other provisions appearing in ZMDI standard "Terms of Sale". ZMDI makes no warranty

(express, statutory, implied and/or by description), including without limitation any warranties of

merchantability and/or fitness for a particular purpose, regarding the information set forth in the Materials

pertaining to ZMDI products, or regarding the freedom of any products described in the Materials from patent

and/or other infringement. ZMDI reserves the right to discontinue production and change specifications and

prices of its products at any time and without notice. ZMDI 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 ZMDI for such applications.

ZMDI 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

intention, by accident or hardware fault.

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

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

compatibility 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

possible, 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 ZMDI web page www.zmdi.com .

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

different data input paths and 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 ZMDI web page www.zmdi.com .

SAFETY-ADVICE

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