1、Allegro绘制PCB流程单位换算1mil = 0.0254 mm1mm = 39.3701 mil默认情况下我们更倾向于使用mil单位绘制PCB板。1新建工程,File New. Project Directory显示工程路径 Drawing Name工程名称,Browse.可选择工程路径 Drawing Type工程类型,绘制PCB板选择Board,封装选择Packagesymbol2设置画布参数,Setup Design Parameters. Design单位为Mils,Size为other,2位精度,Width与Height分别代表画布的宽高LeftX与LowerY代表原点位置坐标
2、点击Apply使修改生效 Display勾选Gridon, 打开SetupGrids.将Non-Etch和AllEtch中的所有Spacing设为1mil=0.0254mm3设置库路径,Setup UserPreference.将所有绘制好的元件封装复制到同一目录下,方便设置库目录, Paths Library指定modulepathpadpath parampath psmpath到封装所在目录4绘制板框,Add LineClass:SubClass = Board Geometry:Outline5倒角,Manufacture Dimimension/Draft fillet倒角半径(Ra
3、dius)参考:100mmx100mm板倒角100mil200mil分别点击倒角的两条边完成倒角6设置允许布线区,Setup Areas RouteKeepinClass:SubClass = Route Keepin:All一般情况,RouteKeepin距离板框0.2mm(8mil)0.5mm(20mil)方法2:使用Z-Copy命令,Edit-Z-Copy选择Class:SubClass=RouteKeepin:All,Size选择Contract向内缩进,Offset填充20mil,点击板框完成复制,此方法亦使用步骤77设置允许元件摆放区,Setup Areas PackageKeep
4、inClass:SubClass = Package Keepin:All一般情况,PacakgeKeepin与RouteKeepin大小一致方法2:使用Z-Copy命令8放置机械安装孔,Place Manual Advanced Settings勾选Library Placement List Mechanical symbols选上需要使用的机械安装孔,敲坐标放置注:使用“选择多个元件,右键Align components”对齐元件。9设置层叠结构,Setup Cross-section双层板按默认设置,从上到下依次为:表层空气,铜走线Top层,玻璃纤维介质层,铜走线Bottom层,底层空
5、气多层板需要做相关层添加FIXME10导入网表,File Import Logic. Cadence选择Designentry CIS(Capture),Always,Importdirectory选择网表文件路径导入完成后File Viewlog.查看导入错误信息,确保0 errors,0warnings11放置元器件,Place QuickPlace.选择Placeall components,点击place完成自动放置检查Unpalcedsymbol count显示状态,确认未放置的元件为0注:有关元器件突出板框外的KC DRC问题 Waive DRCs Waive命令,点击DRC删除即
6、可。12约束设置,Setup Constraints Constraints Manager. Physical Physical Constraint Set All Layers线宽设置为=6mil,添加过孔(小于6的非0值都设为6或更大) Net All Layers电源与地网络设置至少30mil,大功率大电流网络也设置大些 Spacing. 设置线间距、VIA间距等,都至少设为6mil,6mil是根据PCB厂家定的13布局布线接插件(如DB9、JTAG接口、电源接口等)放在PCB板周边;。布线时双击添加过孔,Options中Act可改变当前PCB面,Linewidth设置线宽;Rout
7、e PCB Router Route Automatic可自动布线;。14添加丝印(1)自动添加丝印Manufacture Silkscreen Layer Both Elements Both Classes and subclasses Package geometry Silk Refrence designator Silk. 其它选择None点击Silkscreen完成丝印添加(2)手动添加丝印信息 Add TextClass:Subclass=Manufacture:AutoSilk_Top设置字号及线宽后输入文字信息注:丝印字号修改,Edit Change,Find中选只Text
8、,Class:subclass=Manufacture:空设置字号线宽,全选后Done即可15添加覆铜,Shape PolygonClass:Subclass=Etch:TopOption中勾选上CreateDinamicShape,选择Assign netname为Gnd网络添加底层覆铜,Class:Subclass=Etch:Bottom删除顶层和底层死铜,Shape Delete Islands,Delete allon layer16查看报告,Tools Quick Reports至少检查如下4项:Unconnected Pins ReportShape Dynamic StateSh
9、ape IslandsDesign Rules Check Report17数据库检查,Tools Database Check勾选全3项,点击Check检查,Viewlog查看错误日志18钻孔文件生成(1) 钻孔参数文件生成,Manufacture NC NC Parameters按默认设置,点close后生成nc_param.txt(2) 钻孔文件生成,Manufacture NC NC Drill如果有盲孔或埋孔,则Drilling中选择By Layer,否则默认,点Drill生成*.drl文件,点击Viewlog查看钻孔文件信息(3) 不规则孔的钻孔文件生成,Manufacture N
10、C NC Route默认设置,点击Route生成*.rou文件(4) 钻孔表及钻孔图的生成,Manufacture NC Drill Legend如果有盲孔或埋孔,则Drilling中选择By Layer,否则默认(单位为mil),点击OK生成*.dlt文件19生成光绘(Gerber)文件(1) 设置光绘文件参数,Manufacture Artwork General Parameters Device type Gerber RS274X OUtput units Inches Format Integer places 3 Decimal places 5 Film Control设置层叠
11、结构(10层)Available filmsBottomETCH/BottomPIN/BottomVIAClass/BottomTopETCH/TopPIN/TopVIAClass/TopPastemask_BottomPackageGeometry/Pastemask_BottomStack-Up/Pin/Pastemask_BottomStack-Up/Via/Pastemask_BottomPastemask_TopPackageGeometry/Pastemask_TopStack-Up/Pin/Pastemask_TopStack-Up/Via/Pastemask_TopSolder
12、mask_BottomBoardGeometry/Soldermask_BottomPackageGeometry/Soldermask_BottomStack-Up/Pin/Soldermask_BottomSoldermask_TopBoardGeometry/Soldermask_TopPackageGeometry/Soldermask_TopStack-Up/Pin/Soldermask_TopSilkscreen_BottomBoardGeometry/Silkscreen_BottomPackageGeometry/Silkscreen_BottomManufacture/Aut
13、osilk_BottomSilkscreen_TopBoardGeometry/Silkscreen_TopPackageGeometry/Silkscreen_TopManufacture/Autosilk_TopOutlineBoardGeometry/OutlineDrillBoardGeometry/OutlineManufacture/Nclegend-1-2选中Checkdatabase before artwork复选框! Film options Undefined line width选中层叠结构中的每一层,都设置为6mil Shape bounding box选中层叠结构中
14、的每一层,都设置为100 plot mode选中层叠结构中的每一层,无特殊情况都选择Positive Vector based pad behavior选中每一层都勾选上点击OK完成参数设置(2) 生成光绘文件,Manufacture Artwork仔细检查层叠结构的设置,很重要,不能出错!Selectall选择所有层,确认选中Check database before artwork,执行CreateArtwork生成光绘文件,点击Viewlog查看生成光绘信息,确保没有任何error!20打包Gerber文件给PCB厂商共14个文件:10*.art+ 1*.drl + 1*.rou + 2*.txtTOP.artBottom.artPastemask_Top.artPastemask_Bottom.artSoldermask_Top.artSoldermask_Bottom.artSilkscreen_Top.artsilkscreen_Bottom.artOutline.artDrill.artart_param.txtnc_param.txt*.rou*-1-2.drl打包成*.rar等压缩包发给厂商