Author Topic: Connect one schematic pin to multiple pin in PADS  (Read 2673 times)

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Offline DagoTopic starter

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Connect one schematic pin to multiple pin in PADS
« on: December 02, 2015, 07:25:33 am »
Does anyone know a way to connect one schematic pin to multiple pads in PADS Logic + Pads Layout?

I have a 123 pin LGA step-down converter module which has something like 75 ground pins and 15 switch pins and 12 Vin pins and the schematic symbol will be a total mess and will barely fit to a large schematic sheet if I draw one pin per pad. Also since it is a power module I definitely don't want to split the pins to different sheets, that would make no sense. Every software I've used before has had the possibility to connect one schematic pin to multiple pads but I cannot find anything like that in PADS. There is some "pin mapping" tab in part editor but it is always grayed out. Don't know if that is what I want. Any ideas?
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Offline T3sl4co1l

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Re: Connect one schematic pin to multiple pin in PADS
« Reply #1 on: December 02, 2015, 01:14:00 pm »
I've always seen high pin-count components drawn with multi-second symbols.  Pins are collected into families for each section.  So there's one for, e.g., VCORE and GNDs, one for each IO bank's power and grounds (if applicable), one for each group of actual logic/signal pins, etc.  The entire component may be spread over multiple sheets.

One of those converters will probably occupy a single sheet, using one or two relatively large rectangle symbols.  Don't try to squeeze extra stuff onto the sheet, dedicate one for the purpose.  Clarity is better!

As for actually mapping, I don't know.  Some packages do it, some don't (and some look like they can, but don't).

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Offline jahonen

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Re: Connect one schematic pin to multiple pin in PADS
« Reply #2 on: December 02, 2015, 01:35:47 pm »
Maybe I am an old fart but I think those mentioned pins don't look too bad drawn separately (on A3 sheet size):



I think all connections should be explicitly shown in schematic so that they show in pdf version so one can check what is actually going on. But I can certainly see the point of hiding the actual pin information in this case.

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Janne
 


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