{"id":1918,"date":"2017-11-17T08:00:03","date_gmt":"2017-11-17T16:00:03","guid":{"rendered":"http:\/\/www.autodesk.com\/products\/eagle\/blog\/?p=1918"},"modified":"2023-07-16T13:20:58","modified_gmt":"2023-07-16T20:20:58","slug":"spice-simulation-part-5-schematic-spice-mapping","status":"publish","type":"post","link":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/","title":{"rendered":"SPICE Simulation Part 5: Schematic to SPICE Mapping"},"content":{"rendered":"\n

Welcome back to our SPICE Simulation Series, Part 5! We\u2019ve completed our full tour of the new SPICE features in Autodesk EAGLE 8.4. But wait, you might be asking, how can I simulate all of my existing designs? There\u2019s still more to learn. In this blog, we\u2019ll be looking at how to convert a current schematic into one that\u2019s SPICE compatible.<\/span><\/p>\n\n\n

Example Project<\/h2>\n\n\n

We\u2019ve got another example project lined up made specifically for converting a non-SPICE schematic. Let\u2019s open this now. Look for the <\/span>convert<\/b> project folder within the <\/span>Projects \u00bb ngspice<\/b> directory in your <\/span>Autodesk EAGLE control Panel<\/b>. Open <\/span>spiceconvert.sch<\/b>.<\/span><\/p>\n\n\n\n

\"spice<\/figure>\n\n\n\n

This is a simple circuit, but it serves our purpose well. None of the parts on this schematic are SPICE compatible at the moment. If you click the <\/span>Simulate\u00a0<\/b>button at the top of your interface EAGLE will remind you about this:<\/span><\/p>\n\n\n\n

\"unmapped<\/figure>\n\n\n\n

Before opening the Simulation dialog, EAGLE will always confirm that all of your parts are linked to SPICE Models. If they\u2019re not then you won\u2019t be able to simulate. To convert your schematic a process of part mapping is required. <\/span><\/p>\n\n\n

Part Mapping<\/h2>\n\n\n

We\u2019re now going to walk through how to map all of the symbols on this schematic to SPICE models. To begin, we need to select all of the symbols using the <\/span>Group<\/b> command. Select the <\/span>Group\u00a0<\/b>icon on the left-hand side of your interface, then click and drag a selection box around all of the parts.<\/span><\/p>\n\n\n\n

Next, you\u2019ll right-click on any of the highlighted parts and select <\/span>Add Model<\/b>. You\u2019ll first get a dialog asking if you want to convert all parts with GND in their name to spice ground node 0. This is important. In SPICE you always need to have a node 0 in your netlist. This signifies ground and is used in all of your simulation calculations.<\/span><\/p>\n\n\n\n

\"node0<\/figure>\n\n\n\n

To make our lives easier EAGLE does all the work of converting your GND parts to node 0, so just select the <\/span>Yes<\/b> button to continue. You should now be looking at the <\/span>Add Model<\/b> dialog as shown below:<\/span><\/p>\n\n\n\n

\"add<\/figure>\n\n\n\n

Take a look at the <\/span>Done<\/b> column, and you can see two green checkmarks for GND1 and GND2. These are the existing ground symbols that EAGLE automatically converted to node 0 for us. There\u2019s nothing more that needs to be done for these two, so let\u2019s focus on the remaining parts we need to map: R1, LED1, and G1.<\/span><\/p>\n\n\n

Resistor Mapping<\/h2>\n\n\n

To start, we need to make sure the proper <\/span>Spice Type<\/b> is selected. EAGLE will automatically assign a Spice Type for all the symbols in your schematic, but you always need to double check them for accuracy. Here we can see that the resistor already has a Spice Type of <\/span>R: Resistor<\/b>. <\/span><\/p>\n\n\n\n

\"resistor<\/figure>\n\n\n\n

Let\u2019s now select the <\/span>Map button<\/b> to continue. <\/span><\/p>\n\n\n\n

\"intrinsic<\/figure>\n\n\n\n

Now we\u2019re at the <\/span>Map to Model<\/b> dialog<\/b>. Select the <\/span>Load Model<\/b> tab<\/b>, and you\u2019ll see a model type of <\/span>Intrinsic Device\/No Model <\/b>listed. What does this mean? This is the default SPICE model type for all simple parts that don\u2019t require a specific model or subcircuit, like our resistor. Other simple passive components like capacitors will also use this intrinsic model type. We can leave the default model type as is for our resistor and then select the <\/span>Map Pins tab<\/b> to continue. <\/span><\/p>\n\n\n\n

\"map<\/figure>\n\n\n\n

Here we can see two pins that need to be mapped to model inputs. For a resistor, it doesn\u2019t matter how you link the pins to the model inputs since there are no polarity concerns. You\u2019ll notice that EAGLE has already done this work for us, so all we need to do is select <\/span>OK<\/b> to continue.<\/span><\/p>\n\n\n\n

Boom, one part down, two to go. One quick thing to note, when you map one passive component like a resistor or capacitor, all other components of the same type that use the same symbol inherit the same mapping.<\/span><\/p>\n\n\n\n

This can come in handy when you\u2019re working with larger schematics with a ton of passive components. You\u2019ll likely use the same symbol for all of your resistors, so if you map one, then you map them all in one go. This is a great time saver. <\/span><\/p>\n\n\n

LED Mapping<\/h3>\n\n\n

Next up we have our LED. EAGLE looked at the name prefix of this device and saw an L, which in SPICE stands for an inductor. Clearly this isn\u2019t right, so for LED1 we need to change the Spice Type to <\/span>D: Diode<\/b>, and then select the <\/span>Map button<\/b>.<\/span><\/p>\n\n\n\n

\"spice<\/figure>\n\n\n\n

The <\/span>Map to Model dialog <\/b>will open, and you\u2019ll notice that the Model Type is set to <\/span>Model Card<\/b>. Model Cards are used for intrinsic devices that require models, such as diodes, BJTs, FETs, etc. These parts all need SPICE models to be attached but are not considered subcircuits. <\/span><\/p>\n\n\n\n

In this case, we don\u2019t need to go searching the web for a diode model. The <\/span>Models<\/b> directory in EAGLE already has what we need. Select the <\/span>Load Model button<\/b>, and then navigate to the <\/span>Models folder<\/b> in your EAGLE application directory. In this folder, you\u2019ll want to select the DMOD.mdl file.<\/span><\/p>\n\n\n\n

\"dmod<\/figure>\n\n\n\n

Now that the model is loaded select the <\/span>OK button<\/b> to continue mapping pins to inputs. Here we have C (cathode), which is a negative symbol pin, and A (anode), which is positive. We\u2019ll map Symbol Pin C to <\/span>Model Input: N-<\/b>, and Symbol Pin A to <\/span>Model Input: N+<\/b>. Once those are set, select the <\/span>OK button<\/b> to finish the mapping.<\/span><\/p>\n\n\n\n

\"map<\/figure>\n\n\n

Voltage Source Mapping<\/h3>\n\n\n

The final part is G1, which is a battery. For the Spice Type, we\u2019ll select <\/span>V: Independent Voltage Source<\/b> and then select the <\/span>Map button<\/b>. <\/span><\/p>\n\n\n\n

\"g1<\/figure>\n\n\n\n

In the <\/span>Map to Model dialog,<\/b> we just need to map the positive and negative pins to their respective inputs, that\u2019s easy work. Select <\/span>OK<\/b> when you\u2019re done.<\/span><\/p>\n\n\n\n

\"map<\/figure>\n\n\n\n

If you were following along with us, you should now have all green checkmarks listed in the Done column in the <\/span>Add Model dialog<\/b>. Go ahead and select the <\/span>Done button<\/b> to close this window.<\/span><\/p>\n\n\n\n

\"add<\/figure>\n\n\n\n

If you click the <\/span>Simulate\u00a0<\/b>\u00a0icon at the top of your interface, you\u2019ll be greeted with the Simulation dialog<\/b>, ready to start analyzing!<\/p>\n\n\n

SPICE Compatible<\/h2>\n\n\n

Here we\u2019ve taken a schematic that was non-SPICE compatible and made it simulation ready in just a few simple steps. All it took was a quick process of part mapping. For more practice be sure to try out this workflow on your designs! You can also experiment with the TI Launchpad example design in the EAGLE Projects directory. This circuit has some more advanced components that will put your part mapping skills to the test.<\/span><\/p>\n\n\n\n

Ready to make your designs SPICE compatible? <\/span>Try Autodesk EAGLE 8.4 for free today!<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Got some existing EAGLE designs that you want to simulate with SPICE? No problem. Learn how to quickly make your schematics SPICE compatible. <\/p>\n","protected":false},"author":2425,"featured_media":1808,"menu_order":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[434],"tags":[],"coauthors":[],"class_list":["post-1918","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eagle","dhig-theme--light"],"acf":[],"yoast_head":"\nSchematic to SPICE Model Mapping | EAGLE | Blog<\/title>\n<meta name=\"description\" content=\"Learn how to convert an EAGLE schematic into a SPICE-compatible schematic with part mapping and SPICE models.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Schematic to SPICE Model Mapping | EAGLE | Blog\" \/>\n<meta property=\"og:description\" content=\"Learn how to convert an EAGLE schematic into a SPICE-compatible schematic with part mapping and SPICE models.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/\" \/>\n<meta property=\"og:site_name\" content=\"Fusion Blog\" \/>\n<meta property=\"article:published_time\" content=\"2017-11-17T16:00:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-16T20:20:58+00:00\" \/>\n<meta name=\"author\" content=\"Sam Sattel\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sam Sattel\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Schematic to SPICE Model Mapping | EAGLE | Blog","description":"Learn how to convert an EAGLE schematic into a SPICE-compatible schematic with part mapping and SPICE models.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/","og_locale":"en_US","og_type":"article","og_title":"Schematic to SPICE Model Mapping | EAGLE | Blog","og_description":"Learn how to convert an EAGLE schematic into a SPICE-compatible schematic with part mapping and SPICE models.","og_url":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/","og_site_name":"Fusion Blog","article_published_time":"2017-11-17T16:00:03+00:00","article_modified_time":"2023-07-16T20:20:58+00:00","author":"Sam Sattel","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Sam Sattel","Est. reading time":"8 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/#article","isPartOf":{"@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/"},"author":{"name":"Sam Sattel","@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/#\/schema\/person\/d7e45d522df7d7f98d23e0a8b344ca7b"},"headline":"SPICE Simulation Part 5: Schematic to SPICE Mapping","datePublished":"2017-11-17T16:00:03+00:00","dateModified":"2023-07-16T20:20:58+00:00","mainEntityOfPage":{"@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/"},"wordCount":1144,"commentCount":0,"image":{"@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/#primaryimage"},"thumbnailUrl":"","articleSection":["Eagle"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/","url":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/","name":"Schematic to SPICE Model Mapping | EAGLE | Blog","isPartOf":{"@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/#primaryimage"},"image":{"@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/#primaryimage"},"thumbnailUrl":"","datePublished":"2017-11-17T16:00:03+00:00","dateModified":"2023-07-16T20:20:58+00:00","author":{"@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/#\/schema\/person\/d7e45d522df7d7f98d23e0a8b344ca7b"},"description":"Learn how to convert an EAGLE schematic into a SPICE-compatible schematic with part mapping and SPICE models.","breadcrumb":{"@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/#primaryimage","url":"","contentUrl":""},{"@type":"BreadcrumbList","@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/spice-simulation-part-5-schematic-spice-mapping\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/"},{"@type":"ListItem","position":2,"name":"SPICE Simulation Part 5: Schematic to SPICE Mapping"}]},{"@type":"WebSite","@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/#website","url":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/","name":"Fusion Blog","description":"Product updates, tips, tutorials and community news.","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/#\/schema\/person\/d7e45d522df7d7f98d23e0a8b344ca7b","name":"Sam Sattel","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2018\/09\/face-150x150.jpg2f98009787201817c4da1b4d6ce84681","url":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2018\/09\/face-150x150.jpg","contentUrl":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2018\/09\/face-150x150.jpg","caption":"Sam Sattel"},"description":"Senior Marketing Manger - Fusion 360, EAGLE, Fusion Lifecycle, Fusion Team","url":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/author\/ssattel\/"}]}},"_links":{"self":[{"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/posts\/1918","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/users\/2425"}],"replies":[{"embeddable":true,"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/comments?post=1918"}],"version-history":[{"count":0,"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/posts\/1918\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/"}],"wp:attachment":[{"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/media?parent=1918"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/categories?post=1918"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/tags?post=1918"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-json\/wp\/v2\/coauthors?post=1918"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}