<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="9.4.2">
<drawing>
<board>
<plain>
<wire x1="0" y1="2.54" x2="2.54" y2="0" width="0" layer="20" curve="90"/>
<wire x1="2.54" y1="0" x2="60.448140625" y2="0" width="0" layer="20"/>
<wire x1="60.448140625" y1="0" x2="64.75" y2="4.301859375" width="0" layer="20" curve="90"/>
<wire x1="64.75" y1="4.301859375" x2="64.75" y2="51.82703125" width="0" layer="20"/>
<wire x1="64.75" y1="51.82703125" x2="61.02703125" y2="55.55" width="0" layer="20" curve="90"/>
<wire x1="61.02703125" y1="55.55" x2="3.7552" y2="55.55" width="0" layer="20"/>
<wire x1="3.7552" y1="55.55" x2="0" y2="51.7948" width="0" layer="20" curve="90"/>
<wire x1="0" y1="51.7948" x2="0" y2="19.1262" width="0" layer="20"/>
<wire x1="0" y1="18.9738" x2="0" y2="2.54" width="0" layer="20"/>
</plain>
<libraries>
<library name="custom">
<packages>
<package name="MA20-2_ALT">
<description>&lt;b&gt;PIN HEADER&lt;/b&gt;</description>
</package>
<package name="TO-263-5_MCH">
</package>
<package name="TQFP32_MC_MCH">
</package>
</packages>
</library>
<library name="optocoupler">
<description>&lt;b&gt;Opto Couplers&lt;/b&gt;&lt;p&gt;
Siemens, Hewlett-Packard, Texas Instuments, Sharp, Motorola&lt;p&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="DIL08">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt;</description>
</package>
<package name="DIL06">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="adafruit">
<packages>
<package name="R0603">
<description>&lt;b&gt;RESISTOR&lt;/b&gt;&lt;p&gt;
chip</description>
</package>
</packages>
</library>
<library name="74xx-eu">
<description>&lt;b&gt;TTL Devices, 74xx Series with European Symbols&lt;/b&gt;&lt;p&gt;
Based on the following sources:
&lt;ul&gt;
&lt;li&gt;Texas Instruments &lt;i&gt;TTL Data Book&lt;/i&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;Volume 1, 1996.
&lt;li&gt;TTL Data Book, Volume 2 , 1993
&lt;li&gt;National Seminconductor Databook 1990, ALS/LS Logic
&lt;li&gt;ttl 74er digital data dictionary, ECA Electronic + Acustic GmbH, ISBN 3-88109-032-0
&lt;li&gt;http://icmaster.com/ViewCompare.asp
&lt;/ul&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="SO14">
<description>&lt;b&gt;Small Outline package&lt;/b&gt; 150 mil</description>
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="J1" library="custom" package="MA20-2_ALT" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="OK1" library="optocoupler" package="DIL08" value="6N137">
<attribute name="MF" value=""/>
<attribute name="MPN" value="6N137"/>
<attribute name="NAME"/>
<attribute name="OC_FARNELL" value="1328376"/>
<attribute name="OC_NEWARK" value="52M1895"/>
<attribute name="VALUE"/>
</element>
<element name="OK2" library="optocoupler" package="DIL06" value="4N27M">
<attribute name="MF" value="FAIRCHILD SEMICONDUCTOR"/>
<attribute name="MPN" value="4N27M"/>
<attribute name="NAME"/>
<attribute name="OC_FARNELL" value="unknown"/>
<attribute name="OC_NEWARK" value="72K9939"/>
<attribute name="VALUE"/>
</element>
<element name="U1" library="custom" package="TO-263-5_MCH" value="LM2576-3.3WU-TR">
<attribute name="COPYRIGHT" value="Copyright (C) 2022 Ultra Librarian. All rights reserved."/>
<attribute name="MANUFACTURER_PART_NUMBER" value="LM2576-3.3WU-TR"/>
<attribute name="MFR_NAME" value="Microchip"/>
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R1" library="adafruit" package="R0603" value="100">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R2" library="adafruit" package="R0603" value="1.5k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="IC1" library="74xx-eu" package="SO14" value="7414D">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="U2" library="custom" package="TQFP32_MC_MCH" value="ATSAMD20E16A-AU">
<attribute name="COPYRIGHT" value="Copyright (C) 2022 Ultra Librarian. All rights reserved."/>
<attribute name="MANUFACTURER_PART_NUMBER" value="ATSAMD20E16A-AU"/>
<attribute name="MFR_NAME" value="Microchip"/>
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
</elements>
<signals>
<signal name="+5V">
<contactref element="U1" pad="2"/>
<contactref element="OK1" pad="8"/>
<contactref element="R1" pad="2"/>
<contactref element="J1" pad="4"/>
<contactref element="J1" pad="2"/>
</signal>
<signal name="N$1">
<contactref element="OK1" pad="6"/>
<contactref element="R1" pad="1"/>
<contactref element="IC1" pad="13"/>
</signal>
<signal name="GND">
<contactref element="OK1" pad="5"/>
<contactref element="OK2" pad="2"/>
<contactref element="U1" pad="3"/>
<contactref element="U1" pad="5"/>
<contactref element="IC1" pad="7"/>
<contactref element="J1" pad="6"/>
<contactref element="J1" pad="14"/>
<contactref element="J1" pad="20"/>
<contactref element="J1" pad="30"/>
<contactref element="J1" pad="34"/>
<contactref element="J1" pad="9"/>
<contactref element="J1" pad="25"/>
<contactref element="J1" pad="39"/>
<contactref element="U2" pad="28"/>
<contactref element="U2" pad="10"/>
</signal>
<signal name="VCC">
<contactref element="IC1" pad="14"/>
</signal>
<signal name="N$2">
<contactref element="IC1" pad="12"/>
<contactref element="IC1" pad="11"/>
</signal>
<signal name="N$3">
<contactref element="OK2" pad="1"/>
<contactref element="R2" pad="2"/>
</signal>
<signal name="N$4">
<contactref element="R2" pad="1"/>
<contactref element="IC1" pad="8"/>
</signal>
<signal name="VDDANA">
<contactref element="U2" pad="9"/>
</signal>
<signal name="VDDCORE">
<contactref element="U2" pad="29"/>
</signal>
<signal name="+3V3">
<contactref element="J1" pad="1"/>
<contactref element="U2" pad="30"/>
</signal>
<signal name="RX">
<contactref element="U2" pad="4"/>
<contactref element="IC1" pad="10"/>
</signal>
<signal name="TX">
<contactref element="U2" pad="5"/>
<contactref element="IC1" pad="9"/>
</signal>
<signal name="MDB_TX">
<contactref element="OK1" pad="2"/>
</signal>
<signal name="MDB_GND">
<contactref element="OK1" pad="3"/>
<contactref element="OK2" pad="4"/>
</signal>
<signal name="MDB_RX">
<contactref element="OK2" pad="5"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
