Pololu A4988

5 mer feb 26 2014 Matteo Perini + Fabian Althaus <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd"> <html><head><meta name="qrichtext" content="1" /><style type="text/css"> p, li { white-space: pre-wrap; } </style></head><body style=" font-family:'Ubuntu'; font-size:9pt; font-weight:400; font-style:normal;"> The A4988 stepper motor driver carrier is a breakout board for Allegro’s A4988 microstepping bipolar stepper motor driver. The driver features adjustable current limiting, overcurrent and overtemperature protection, and five different microstep resolutions (down to 1/16-step). It operates from 8 – 35 V and can deliver up to approximately 1 A per phase without a heat sink or forced air flow (it is rated for 2 A per coil with sufficient additional cooling). Dimensions <table border="0" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px;" cellspacing="2" cellpadding="0"> <tr> <td> Size: </td> <td> 0.6″ × 0.8″ </td></tr> <tr> <td> Weight: </td> <td> 1.3 g<a href="http://www.pololu.com/product/1182/specs#note1">1</a> </td></tr></table> General specifications <table border="0" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px;" cellspacing="2" cellpadding="0"> <tr> <td> Minimum operating voltage: </td> <td> 8 V </td></tr> <tr> <td> Maximum operating voltage: </td> <td> 35 V </td></tr> <tr> <td> Continuous current per phase: </td> <td> 1 A<a href="http://www.pololu.com/product/1182/specs#note2">2</a> </td></tr> <tr> <td> Maximum current per phase: </td> <td> 2 A<a href="http://www.pololu.com/product/1182/specs#note3">3</a> </td></tr> <tr> <td> Minimum logic voltage: </td> <td> 3 V </td></tr> <tr> <td> Maximum logic voltage: </td> <td> 5.5 V </td></tr> <tr> <td> Microstep resolutions: </td> <td> full, 1/2, 1/4, 1/8, and 1/16 </td></tr> <tr> <td> Reverse voltage protection?: </td> <td> N </td></tr></table> This product is a carrier board or breakout board for Allegro’s A4988 DMOS Microstepping Driver with Translator and Overcurrent Protection; we therefore recommend careful reading of the <a href="http://www.pololu.com/file/download/a4988_DMOS_microstepping_driver_with_translator.pdf?file_id=0J450">A4988 datasheet</a> (380k pdf) before using this product. This stepper motor driver lets you control one <a href="http://www.pololu.com/category/87/stepper-motors">bipolar stepper motor</a> at up to 2 A output current per coil (see the Power Dissipation Considerations section below for more information). Here are some of the driver’s key features: <ul style="margin-top: 0px; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; -qt-list-indent: 1;"><li style=" margin-top:12px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Simple step and direction control interface </li> <li style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Five different step resolutions: full-step, half-step, quarter-step, eighth-step, and sixteenth-step </li> <li style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor’s rated voltage to achieve higher step rates </li> <li style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay) </li> <li style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection </li> <li style=" margin-top:0px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Short-to-ground and shorted-load protection</li></ul> This product ships with all surface-mount components—including the A4988 driver IC—installed as shown in the product picture. Note that we carry several stepper motor drivers that can be used as alternatives for this module. The <a href="http://www.pololu.com/product/2128">Black Edition A4988 stepper motor driver carrier</a> is available with approximately 20% better performance; except for thermal characteristics, the Black Edition and this (green) board are interchangeable. We also sell a <a href="http://www.pololu.com/product/1183">larger version of the A4988 carrier</a> that has reverse power protection on the main power input and built-in 5 V and 3.3 V voltage regulators that eliminate the need for separate logic and motor supplies. Our <a href="http://www.pololu.com/product/2133">DRV8825 carrier</a> offers approximately 50% better performance over a wider voltage range and with a few additional features, while our <a href="http://www.pololu.com/product/2134">DRV8834 carrier</a> works with motor supply voltages as low as 2.5 V; either of these boards can be used as a drop-in replacement for this driver in many applications.</body></html> Pololu A4988 stepper motor driver pololu a988 stepper motor driver variant 2 SO16 false IC if 0 true

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http://www.pololu.com/product/1182 Pololu A4988