Padstack Editor and rectangles with rounded corners

Hmmm,

There is no way of manipulating the padstack editor like that as far as I know.

Certainly it would be possible in Skill to emulate the padstack form and add that functionality but it would be a big job that I doubt has been done.

I think you have two options -

1/ Ask Cadence to add the rounded pad feature to the Padstack editor. With the proliferation of RF and flex designs that require pads with such a shape they may well acquiesce - but it will take some time.

2/ Write some Skill code just to create the shape and assign it to a pad using a suitable gui. I'm sure several of the people on this forum have code already to do something similar to this. I have code to round pad apertures for paste stencils.

Let me know what further help we can offer.

 Ya, SKILL could make quick work of converting a rectangle shape to a rounded-corner rectangle shape, fed a radius for the rounded corners. You know the corners ( which become the obverse of the centerpoints of the arcsegs) and you know apriori that all arcsegs will be minor therefore calculating the centerppints for the arcs and truncated linesegs becomes easy.

Chris Walters

local Cadence guru

()

Hi,

there's no problem creating rounded rectangle shapes but creating a padstack of them without the padstack-editor. I dont know how. I thought of copying something from Footprint Maker by Richard but no way.

OK. It's easy to create a padstack. I've included code for creating and SMD padstack based on a name.

As you can see from the other posts, creating a rectangle with rounded corners is also relatively easy.

The difficult part is knowing exactly what you want to do and, hence, what the form should look like.

Dave

defun( TLU_makeSMDPadstack (padName, figure, padx, pady @optional (res t), (paste t))
 let((pad, pads)
  unless(pady, pady = padx)
  pad = make_axlPadStackPad(?layer "TOP", ?type 'REGULAR, ?figure figure, ?figureSize padx:pady)
  when(pad, pads = list(pad))
  and(pads, res
    pad = make_axlPadStackPad(?layer "SOLDERMASK_TOP", ?type 'REGULAR, ?figure figure, ?figureSize padx:pady)
    pads = cons(pad, pads)
  )
  and(pads, paste
    pad = make_axlPadStackPad(?layer "PASTEMASK_TOP", ?type 'REGULAR, ?figure figure, ?figureSize padx:pady)
    pads = cons(pad, pads)
  )
  axlDBCreatePadStack(padName, nil, pads)
  axlPadstackToDisk(padName)
))

OK, easy to describe: As you can see I want something that creates rounded rectangle Padstacks I can use for my parts. I hope it's clearer now.