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 <date>mer feb 26 2014</date>
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&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">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).&lt;/p>
&lt;p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;br />&lt;/p>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-size:x-large; font-weight:600;">Dimensions&lt;/span>&lt;/p>
&lt;table border="0" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px;" cellspacing="2" cellpadding="0">
&lt;tr>
&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">Size: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">0.6″ × 0.8″ &lt;/p>&lt;/td>&lt;/tr>
&lt;tr>
&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">  Weight: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">1.3 g&lt;a href="http://www.pololu.com/product/1182/specs#note1">&lt;span style=" text-decoration: underline; color:#0057ae; vertical-align:super;">1&lt;/span>&lt;/a> &lt;/p>&lt;/td>&lt;/tr>&lt;/table>
&lt;p style=" margin-top:16px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-size:x-large; font-weight:600;">General specifications&lt;/span>&lt;/p>
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&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">Minimum operating voltage: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">8 V &lt;/p>&lt;/td>&lt;/tr>
&lt;tr>
&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">Maximum operating voltage: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">35 V &lt;/p>&lt;/td>&lt;/tr>
&lt;tr>
&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">Continuous current per phase: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">1 A&lt;a href="http://www.pololu.com/product/1182/specs#note2">&lt;span style=" text-decoration: underline; color:#0057ae; vertical-align:super;">2&lt;/span>&lt;/a> &lt;/p>&lt;/td>&lt;/tr>
&lt;tr>
&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">Maximum current per phase: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">2 A&lt;a href="http://www.pololu.com/product/1182/specs#note3">&lt;span style=" text-decoration: underline; color:#0057ae; vertical-align:super;">3&lt;/span>&lt;/a> &lt;/p>&lt;/td>&lt;/tr>
&lt;tr>
&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">Minimum logic voltage: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">3 V &lt;/p>&lt;/td>&lt;/tr>
&lt;tr>
&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">Maximum logic voltage: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">5.5 V &lt;/p>&lt;/td>&lt;/tr>
&lt;tr>
&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">Microstep resolutions: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">full, 1/2, 1/4, 1/8, and 1/16 &lt;/p>&lt;/td>&lt;/tr>
&lt;tr>
&lt;td>
&lt;p align="center" style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;span style=" font-weight:600;">Reverse voltage protection?: &lt;/span>&lt;/p>&lt;/td>
&lt;td>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">N &lt;/p>&lt;/td>&lt;/tr>&lt;/table>
&lt;p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;br />&lt;/p>
&lt;p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">&lt;br />&lt;/p>
&lt;p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">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 &lt;a href="http://www.pololu.com/file/download/a4988_DMOS_microstepping_driver_with_translator.pdf?file_id=0J450">&lt;span style=" text-decoration: underline; color:#0057ae;">A4988 datasheet&lt;/span>&lt;/a> (380k pdf) before using this product. This stepper motor driver lets you control one &lt;a href="http://www.pololu.com/category/87/stepper-motors">&lt;span style=" text-decoration: underline; color:#0057ae;">bipolar stepper motor&lt;/span>&lt;/a> at up to 2 A output current per coil (see the &lt;span style=" font-style:italic;">Power Dissipation Considerations&lt;/span> section below for more information). Here are some of the driver’s key features:&lt;/p>
&lt;ul style="margin-top: 0px; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; -qt-list-indent: 1;">&lt;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 &lt;/li>
&lt;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 &lt;/li>
&lt;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 &lt;/li>
&lt;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) &lt;/li>
&lt;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 &lt;/li>
&lt;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&lt;/li>&lt;/ul>
&lt;p style=" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">This product ships with all surface-mount components—including the A4988 driver IC—installed as shown in the product picture.&lt;/p>
&lt;p style=" margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Note that we carry several stepper motor drivers that can be used as alternatives for this module. The &lt;a href="http://www.pololu.com/product/2128">&lt;span style=" text-decoration: underline; color:#0057ae;">Black Edition A4988 stepper motor driver carrier&lt;/span>&lt;/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 &lt;a href="http://www.pololu.com/product/1183">&lt;span style=" text-decoration: underline; color:#0057ae;">larger version of the A4988 carrier&lt;/span>&lt;/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 &lt;a href="http://www.pololu.com/product/2133">&lt;span style=" text-decoration: underline; color:#0057ae;">DRV8825 carrier&lt;/span>&lt;/a> offers approximately 50% better performance over a wider voltage range and with a few additional features, while our &lt;a href="http://www.pololu.com/product/2134">&lt;span style=" text-decoration: underline; color:#0057ae;">DRV8834 carrier&lt;/span>&lt;/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.&lt;/p>&lt;/body>&lt;/html></description>
 <title>Pololu A4988</title>
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</module>
