There are several technologies used for keypads; among them are snap-domes (metal domes with 3 tabs that enter plated holes, and a bump that contacts a center pcb pad); elastomeric (an insulating plastic sheet with round conductive rubber pads that contact matching conductive grids located on the PCB below each rubber pad); and keypad assemblies (which have the contacts buried between plastic layers of a flexible film, with connector "tails" for row and column). Or the whole thing may come pre-assembled in a keypad module, with pins like any other component.
The layout varies widely for the different types, so it's best to get the preferred PCB layout from the manufacturer for the exact part number or family you'll be using. Be sure to bet their recommendation for contact plating, often specified as gold. If it's to be gold (or other) plating, you'll have to do a drawing showing the area to be plated, as the fabricator will need to mask off all unplated areas. Brian Foothill Services LLC At 08:29 PM 3/20/02 +0800, you wrote: >Hi, > >I'm going to start a layout with key-pad but I can't find any recommend footprint for it? > >Any advice or help on this? > >Thanks! >Ciao... >Adeline > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
