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ASI4U Datasheet(PDF) 7 Page - Integrated Device Technology |
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ASI4U Datasheet(HTML) 7 Page - Integrated Device Technology |
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7 / 70 page  ASI4U / ASI4U-E / ASI4U-F Datasheet © 2016 Integrated Device Technology, Inc. 7 January 26, 2016 1 Important Safety Advice Important Safety Notice: This IDT product is 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 IDT for such applications. 1.1. AS-i-Safety Applications The ASI4U/ASI4U-E/ASI4U-F is designed to allow replacement of IDT’s A²SI ICs in existing board layouts and applications (also see section 1.2 for important restrictions). However, since the ASI4U/ASI4U-E/ASI4U-F pro- vides 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. IDT strongly recommends the use of the Safety Mode feature of the ASI4U/ASI4U-E/ASI4U-F if it is replacing the A²SI in existing ASI-Safety designs. The same fault reaction times as with the A²SI are guaranteed only in this Safety Mode. For compatibility with the modified data input routing in Safety Mode, the user must adapt the safety code table stored in the external microcontroller. Only safety code sequences that contain the value 1110 are permitted. If the IC is operated in Safety Mode, the user must ensure that the Synchronous Data I/O Mode as well as the data input filters remain disabled by appropriate EEPROM configuration. Application of the ASI4U/ASI4U-E/ASI4U-F in Standard Mode (no Safety Mode enabled) for AS-i Safety products is possible if an additional fault reaction time of 40ms is taken into account. The user must also adhere to the additional security advice provided in Production and Repair of AS-i Safety Slaves, which is available on the IDT web page www.IDT.com (see section 8). 1.2. Repair of ASI-Safety Modules Important: If an A²SI-based ASI-Safety module must be repaired, replacing the A²SI IC with the newer ASI4U/ASI4U-E/ASI4U-F is explicitly prohibited. This is to prevent safety-relevant deviations of module properties that can result from the different data input paths and the possible increase in fault reaction time discussed in section 1.1. The user must also adhere to the additional security advice provided in Production and Repair of AS-i Safety Slaves, which is available on the IDT web page www.IDT.com. ! |
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