I'm trying to do a Capacitive Touch Pad component. I want it to be a component, so it's intrinsically defined. In other words, so it stands alone as a preformed "part", with a schematic symbol that has one pin, that is electrically connected to a copper region that serves as the Capacitive Touch Region. This schematic symbol could, then, be used in a schematic capture that, when converted to a PCB, asserts the preformed presence of a Touch Pad, without any further definition. The Touch Pad would own a ratline that can be routed to.
I've tried the following ways to create a 1cm x 1cm Touch Pad -- each failing due to DRC errors:
- A 1cm x 1cm pad, associated with the one pin on a schematic symbol [rendered as a filled square].
- A pattern composed of a 1cm x 1cm filled rectangle on the Signal Layer, with an SMD 1mm x 1.1mm pad that slightly overlaps the rectangle [and, again, that pattern is associated with a schematic symbol that has one pin].
I resorted to creating a component called "Touch Pad DIY" ["DIY" = "Do It Yourself"], with a note to use a copper pour to create the actual pad [and then, of course, associate the pour, with the Touch Pad net] -- but that sticks in my "purist craw"
If only there was something like a "preemptive pour".
Anybody have any ideas?
If left to evolution, would this PCB ever design itself, and what would the lead time be on that?