EEVblog Electronics Community Forum
Electronics => PCB/EDA/CAD => Altium Designer => Topic started by: photoflect on January 27, 2018, 06:45:46 pm
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I am working on a PCB. There are 3 pads on the bottom layer for a photodiode and the rest of the components are on the top layer. However, there are always collision errors when the top components are near or on the photodiode pads even though they are on the bottom layer and technically do not interfere with each other. Attached are screenshots showing the errors for one component. Does anyone know what is going on and is there any way that I can fix this. This is my first time using Altium any help is appreciated!
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It says "between component on top layer and component on top layer".
(http://i3.kym-cdn.com/photos/images/newsfeed/000/614/134/0af.jpg)
It appears that you didn't put a photodiode on the bottom, you put a photodiode on top with (for some reason) pads on the bottom.
Altium isn't smart enough to automatically understand this bamboozle, so it's telling you it doesn't get it. :P
On a related subject (and probably one that will solve your problem regardless of sidedness), there's an oft-missed quirk to when 3D data is absent, the whole outline of the footprint is assumed as its 3D bounding box!
Plop in a 3D model of the photodiode, or make it a bottom side component (so the pads in the library will be on the top side), and I think you will be fine. :)
Tim