This application note describes implementation methods A6279 certain c

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This application note describes implementation methods A6279 certain c

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A6279 Timing Requirement
This application note describes implementation methods A6279 certain customer application configurations. staggered delay circuit implemented A6279 results some special timing restrictions, applicable system asynchronous timing between serial port programming outputs. such case, ignoring timing restrictions (A.E below) would result unpredictable operation. Essentially, outputs given command change state, timing rule violated, instruction change state will ignored. When outputs given commands change, three different methods used: Serial Port Latched Mode Change command rising edge (diagram Serial Port Non-latched Mode Change command rising edge (diagram (see both diagrams).
Diagram Latched Mode
Minimum falling rising .1200 Minimum rising rising.1200 Minimum high pulse width .1200 Minimum pulse width .1200 Minimum period .1200 Note: possible control timing relationship between free running signal, effect system minimized Decreasing update frequency, reduce number events where edges align with rising edge. Increasing frequency. case timing violation above, data provided will missed only cycle. Therefore changed, from example, outputs would only danger having incorrect data kHz) instead (100 Hz). Having LEDs incorrect state short durations noticeable.
Diagram Non-Latched Mode
Minimum period .1200 Minimum rising rising .1200 Minimum rising rising .1200 Minimum falling rising .1200 Note: typical value staggered delay typically range 1200 value chosen some margin.
295051-AN
Copyright ©2008, Allegro MicroSystems, Inc. products described here manufactured under more U.S. patents U.S. patents pending. Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements performance, reliability, manufacturability products. Before placing order, user cautioned verify that information being relied upon current. Allegro's products used life support devices systems, failure Allegro product reasonably expected cause failure that life support device system, affect safety effectiveness that device system. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringement patents other rights third parties which result from use. latest version this document, visit website: www.allegromicro.com
Allegro MicroSystems, Inc. Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com
295051-AN

This application note describes implementation methods A6279 certain c

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