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I have two sub parts of the same IC (STM32L476RG). enter image description here

I have added these sub parts as two components in the same schematic library and have attached the same footprints for both of them. But when I make the layout, I get two separate footprints for them. How do I make sure that both these subparts are recognised as parts of the same IC? I am using Altium designer tool.

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2 Answers 2

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You should not create separate parts in the library. Altium provides you with the ability to create sub-parts (multi-part components). This is popular for large ICs (i.e. FPGAs, or ICs with multiple independent functions), or ICs such as digital logic where you might have multiple identical gates in a single component.

You can find a description of how to do this in the Altium documentation. Scroll down to where it says Creating a New Schematic Component with Multiple Parts.

Effectively, you start by creating a new component (just the first part). When that's done go to the Tools menu and select New Part. Alternatively you can use the shortcut T-W.

enter image description here

From there you can create your second sub-part, and repeat the "New Part" process as many times as you need.

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  1. In your schematic library, create your first sub-part
  2. then go to Tools >> Add Part
  3. Make second sub-part here and add your footprint
  4. Compile and done!
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    \$\begingroup\$ Step "4." is optional and dependent on your library structure. If using a native schlib (not intlibs or other complexities), then simply saving the schlib library is adequate. \$\endgroup\$ Oct 1, 2018 at 16:01

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