Author Topic: Internally conected pins, how to deal with?  (Read 5532 times)

0 Members and 1 Guest are viewing this topic.

Offline ElektroQuarkTopic starter

  • Supporter
  • ****
  • Posts: 1245
  • Country: es
    • ElektroQuark
Internally conected pins, how to deal with?
« on: February 28, 2014, 08:48:07 am »
Hello,

I want to make a schematic and footprint symbols for the typical 4 pin pushbutton.
It has two pairs of pins connected internally.
How must they be managed so if one of them is connected to a net Altium sees both connected? Same name? Setting any internal property?

Thank you.

Offline poorchava

  • Super Contributor
  • ***
  • Posts: 1673
  • Country: pl
  • Troll Cave Electronics!
Re: Internally conected pins, how to deal with?
« Reply #1 on: February 28, 2014, 08:53:27 am »
You can place multiple pins in footprint editor that will have the same designator. When you doubleclick a pin (or righclick and go to properties) there is 'designator field'. The effect is that you have multiple package pins connected to one schematic pin.
I love the smell of FR4 in the morning!
 

Offline ElektroQuarkTopic starter

  • Supporter
  • ****
  • Posts: 1245
  • Country: es
    • ElektroQuark
Re: Internally conected pins, how to deal with?
« Reply #2 on: February 28, 2014, 08:55:39 am »
So I need a two pin schematic symbol not a four pined one.

Offline Psi

  • Super Contributor
  • ***
  • Posts: 10220
  • Country: nz
Re: Internally conected pins, how to deal with?
« Reply #3 on: February 28, 2014, 09:09:54 am »
The schematic symbol will have 2 connections, eg. designator 1 and 2
The footprint will have 4 TH/SMD pads  two with the designator of 1 and two with the designator of 2
Greek letter 'Psi' (not Pounds per Square Inch)
 

Offline ElektroQuarkTopic starter

  • Supporter
  • ****
  • Posts: 1245
  • Country: es
    • ElektroQuark
Re: Internally conected pins, how to deal with?
« Reply #4 on: February 28, 2014, 09:11:19 am »
Solved.
Thank you.

Offline poorchava

  • Super Contributor
  • ***
  • Posts: 1673
  • Country: pl
  • Troll Cave Electronics!
Re: Internally conected pins, how to deal with?
« Reply #5 on: February 28, 2014, 11:56:39 am »
Small note: I consider doing the above a bad design practice in general. For a small design and uncomplicated parts it's ok. I try as much as I can to have a schematic symbol that has exactly one symbol pin per one package pin. just a good design practice.
I love the smell of FR4 in the morning!
 

Offline Rufus

  • Super Contributor
  • ***
  • Posts: 2095
Re: Internally conected pins, how to deal with?
« Reply #6 on: February 28, 2014, 02:39:28 pm »
Small note: I consider doing the above a bad design practice in general. For a small design and uncomplicated parts it's ok. I try as much as I can to have a schematic symbol that has exactly one symbol pin per one package pin. just a good design practice.

That depends on if you consider a schematic to be a graphical method of entering netlist and partlist to make a PCB  or if you consider a schematic to be a document showing the scheme of a circuit.
 

Offline ElektroQuarkTopic starter

  • Supporter
  • ****
  • Posts: 1245
  • Country: es
    • ElektroQuark
Re: Internally conected pins, how to deal with?
« Reply #7 on: February 28, 2014, 02:56:25 pm »
Small note: I consider doing the above a bad design practice in general. For a small design and uncomplicated parts it's ok. I try as much as I can to have a schematic symbol that has exactly one symbol pin per one package pin. just a good design practice.

How is done "the proper way" then?

Offline tszaboo

  • Super Contributor
  • ***
  • Posts: 7909
  • Country: nl
  • Current job: ATEX product design
Re: Internally conected pins, how to deal with?
« Reply #8 on: February 28, 2014, 03:19:21 pm »
Depends how you want to connect the button. You can tell alitum that they are internally connected, (in the SCHlib editor) but that can lead to a design, where two GND regions are only connected through the button. I dont recomend that option for this.
The best way to do this is to have all four pin on the schematic, and enable pin swapping for the two pairs.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf