Re: [PEDA] footprint for key-finger/keypad
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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] footprint for key-finger/keypad
Adeline, I have done a good deal of keyboards. You'll need to know if these keypads will be gold plated or carbon ink. The widths and types of patterns can depend on this. They tend to need wider traces when carbon ink. The carbon ink has been widely used for me, it is plenty durable and cheaper than gold. It's been about 2 years since I've done one, but I don't think the technology has progressed so much that my patterns are un-acceptable. Maybe you'll get more advise on this forum, but if not you can contact me off line if you'd like me to send you them. Bob Jones Digitized Technologies 2 Summit Road P.O.Box 7284 Prospect, CT. 06712-1541 Tel: 203-758-6312 Fax: 203-758-3338 email: [EMAIL PROTECTED] [EMAIL PROTECTED] Notice: This message is intended solely for the person to whom it is addressed. Unintended recipients will be legally responsible for unauthorized use, disclosure, copying or distribution. If you have received this message in error, please notify the sender immediately by replying to this message. Then delete this message from your system. Thank you. - Original Message - From: "Adeline Ko" <[EMAIL PROTECTED]> To: "Protel EDA Forum" <[EMAIL PROTECTED]> Sent: Wednesday, March 20, 2002 7:29 AM Subject: [PEDA] footprint for key-finger/keypad 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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] footprint for key-finger/keypad
You need to make use of the mechanical information to create a footprint if one is not already available. Kevin Knight Amino Communications Ltd. Longstanton House, Woodside, Longstanton, Cambs, CB4 5BU, UK. Tel: +44 (0)1954 784500 Tel: +44 (0)1954 784504 (direct) Fax: +44 (0)1954 784501 email: [EMAIL PROTECTED] > -Original Message- > From: Adeline Ko [mailto:[EMAIL PROTECTED]] > Sent: 20 March 2002 12:30 > To: Protel EDA Forum > Subject: [PEDA] footprint for key-finger/keypad > > > 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/proteledaforum@techservinc.com > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
