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            EEPW首頁(yè) > EDA/PCB > 設(shè)計(jì)應(yīng)用 > Cadence PCB設(shè)計(jì)使用筆記

            Cadence PCB設(shè)計(jì)使用筆記

            作者: 時(shí)間:2012-08-06 來(lái)源:網(wǎng)絡(luò) 收藏

            四、高速設(shè)計(jì)知識(shí)(略)

            五、建立元件庫(kù)
            通孔焊盤(pán)的設(shè)計(jì):
            1、定義:類(lèi)型Through,中間層(fixed),鉆孔Drill/slot(圓形,內(nèi)壁鍍錫plated,尺寸)
            2、層的定義:BEGIN Layer(Top)層:REGULAR-PAD < THERMAL-PAD = ANTI-PAD
            END LAYER(同BEGIN,常用copy begin layer, then paste it)
            TOP SOLDERMASK:只定義REGULAR-PAD ,大于(Begin layer層regular-pad,約為1.1~1.2倍)
            BOTTOM SOLDERMASK(同Top soldermask,常用Top soldermask, then paste it)
            例1 //---------------------------------------------------------------------------------------
            Padstack Name: PAD62SQ32D

            *Type: Through
            *Internal pads: Fixed
            *Units: MILS
            Decimal places: 4

            Layer Name Geometry Width Height Offset (X/Y) Flash Name Shape Name
            ------------------------------------------------------------------------------------------------------------------
            *BEGIN LAYER
            *REGULAR-PAD Square 62.0000 62.0000 0.0000/0.0000
            *THERMAL-PAD Circle 90.0000 90.0000 0.0000/0.0000
            *ANTI-PAD Circle 90.0000 90.0000 0.0000/0.0000
            *END LAYER(同BEGIN,常用copy paste)
            DEFAULT INTERNAL(Not Defined )
            *TOP SOLDERMASK
            *REGULAR-PAD Square *75.0000 75.0000 0.0000/0.0000
            *BOTTOM SOLDER MASK
            *REGULAR-PAD Square *75.0000 75.0000 0.0000/0.0000
            TOP PASTEMASK(Not Defined )
            BOTTOM PASTEMASK(Not Defined )
            TOP FILMMASK(Not Defined )
            BOTTOM FILMMASK(Not Defined )
            NCDRILL
            32.0000 Circle-Drill Plated Tolerance: +0.0000/-0.0000 Offset: 0.0000/0.0000
            DRILL SYMBOL
            Square 10.0000 10.0000
            ----------------------------------------------

            表貼焊盤(pán)的設(shè)計(jì):
            1、定義,類(lèi)型single,中間層(option),鉆孔(圓形,內(nèi)壁鍍錫plated,尺寸一定為0)
            2、層的定義:BEGIN Layer(Top)層:只定義REGULAR-PAD
            TOP SOLDERMASK:只定義REGULAR-PAD ,大于(Begin layer層regular-pad,約為1.1~1.2倍)
            例2 ------------------------------------------------
            Padstack Name: SMD86REC330
            *Type: Single
            *Internal pads: Optional
            *Units: MILS
            Decimal places: 0
            Layer Name Geometry Width Height Offset (X/Y) Flash Name Shape Name
            ------------------------------------------------------------------------------------------------------------------
            *BEGIN LAYER
            *REGULAR-PAD Rectangle 86 330 0/0
            THERMAL-PAD Not Defined
            ANTI-PAD Not Defined

            END LAYER(Not Defined )
            DEFAULT INTERNAL(Not Defined )
            *TOP SOLDERMASK
            *REGULAR-PAD Rectangle 100 360 0/0
            BOTTOM SOLDERMASK(Not Defined )
            TOP PASTEMASK(Not Defined )
            BOTTOM PASTEMASK(Not Defined )
            TOP FILMMASK(Not Defined )
            BOTTOM FILMMASK(Not Defined )
            NCDRILL(Not Defined )
            DRILL SYMBOL
            Not Defined 0 0
            ------------------------------------------

            手工建立元件(主要包含四項(xiàng):PIN;Geometry:SilkScreen/Assembly;Areas:Boundary/Height;RefDes:SilkScreen/Display)
            注意:元件應(yīng)放置在坐標(biāo)中心位置,即(0,0)
            1、File ew..package symbol
            2、設(shè)定繪圖區(qū)域:SetupDrawing size...Drawing parameter...
            3、添加pin:選擇padstack ,放置,右排時(shí)改變text offset(缺省為-100,改為100)置右邊
            4、添加元件外形:(Geometery)
            *絲印層Silkscreen:AddLine(OptionActive:package geometery;subclass:silkscreen_top)
            *裝配外框Assembly:AddLine(OptionActive:package geometery;subclass:Assembly_top)
            5、添加元件范圍和高度:(Areas)
            *元件范圍Boundary:SetupAreaspackage boundary....Add Line(OptionActive Class:Package geometry;subclass:Package_bound_top)
            *元件高度Height:SetupAreaspackage Height....Add Line(OptionActive Class:Package geometry;subclass:Package_bound_top)
            6、添加封裝標(biāo)志:(RefDes)LayoutLabelsResDs...)
            *底片用封裝序號(hào)(ResDes For Artwork):Pin1附近(...RefDes:Silkscreen_Top)
            *擺放用封裝序號(hào)(ResDes For Placement):封裝中心附近(...RefDes:Display_Top)
            *封裝中心點(diǎn)(Body center):指定封裝中心位置(AddTextPackage Geometery:Boby_centre)
            7、建立Symbol文件:FileCreate Symbol

            利用向?qū)Ы?p>



            關(guān)鍵詞: Cadence PCB 使用筆記

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