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Different design rules for parts of 5v
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skibum-za 4 years ago
Hi, I'm designing a pcb, where I'm having a 5v 5amp psu plugged into it. What I'm trying to do is setup the design rules, so I've got the 'low' power parts (IC's, caps, etc) which will have the default drc rule, but also a high power part which I want to use different design rules. So 1mm track width an larger clearance etc. While in the schematic view I can have a '\+5V' and '\+5V\_HIGH'\, when I got to the pcb\, the '\+5V\_HIGH' just disappears\. Seems it worked out that both are the same as they come from the same place\. While I can route it all fine with the different trace widths, I so far either have the drc setup for either the low or the high, where I'd like to have it setup for both. Any ideas how I can do this? Thanks
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andyfierman 4 years ago
The problem is that you cannot give one net different names in different places. This is true in both the Schematic and in the PCB. Therefore you can only define different rules for different nets, not for different parts of the same net. If you do split a net into two different sections, they must have different netnames and therefore when you come to try to join them in the PCB, you will get DRC errors because you are apparently shorting two different nets together. You could join them using a 2 pin jumper of some description but that is messy. Your only option is to manually select the relevant PCB segments and change their width.
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skibum-za 4 years ago
Thanks. Just checking I wasn't missing something.
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Stuey 2 years ago
This is a problem. If you have a small, surface mount chip that monitors power - power that's on a big fat trace - you either set the rule for that big fat trace which will make some routing impossible or don't set the rule then try to re-layout your board.
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andyfierman 2 years ago
It's much less of an issue, if at all, if the routing is done manually as opposed to using the autorouter.
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Xenons 2 years ago
You can make a custom part to join the different nets (needed when multiple grounds are required) but those will result in their own set of DRC errors.
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andyfierman 2 years ago
@skibum-za, @Xenons, See: [https://easyeda.com/forum/topic/Net-tie-a-copper-only-component-with-2-pads-to-split-nets-without-DRC-errors-and-multiple-netname-warnings-b6a099bf01bb4055b821ab398ee37b60](https://easyeda.com/forum/topic/Net-tie-a-copper-only-component-with-2-pads-to-split-nets-without-DRC-errors-and-multiple-netname-warnings-b6a099bf01bb4055b821ab398ee37b60)
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