Post by thread:[PIC:] Programming SOIC chips before soldering

Hi all, I am in the process of switching to SMT parts to save on endless drilling for a run of devices (100+) and to further reduce the size of the device. I am working with 12f629s, so its only a 8 pin SOIC, but I need a way to program the buggers before I solder them in the circuit. ICSP is not really an option because of the size and compactness of the device (even bare board). There is definitly no room for headers. Is there any kind of socket or clip or something I can use to connect to the bare SOICs long enough to program and verify them? The only thing I have found is for DIPs. Any experiences with this is apreciated :-) TIA, Ben Hencke __________________________________ Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam http://mail.yahoo.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

At 02:00 AM 3/17/2004 -0800, you wrote: >Hi all, >I am in the process of switching to SMT parts to save >on endless drilling for a run of devices (100+) and to >further reduce the size of the device. I am working >with 12f629s, so its only a 8 pin SOIC, but I need a >way to program the buggers before I solder them in the >circuit. ICSP is not really an option because of the >size and compactness of the device (even bare board). >There is definitly no room for headers. > >Is there any kind of socket or clip or something I can >use to connect to the bare SOICs long enough to >program and verify them? The only thing I have found >is for DIPs. > >Any experiences with this is apreciated :-) You can get programming sockets for them, and wire your own adapter. They are not cheap. http://yamaichi.us.phtemp.com/pdf/t&b/ic51_sop.pdf Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" spam_OUTspeffTakeThisOuTinterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

On Wed, Mar 17, 2004 at 02:00:52AM -0800, Ben Hencke wrote: > Is there any kind of socket or clip or something I can > use to connect to the bare SOICs long enough to > program and verify them? The only thing I have found > is for DIPs. Would a SOIC clip like the following be any good? http://uk.farnell.com/jsp/catalog/viewproductdetails.jsp?prodId=178278 You'd have to solder the chip first though, and probably before other parts nearby if it's cramped, so may not be suitable. Not tried it myself, just came across it while looking for DIP clips. Chris -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

On Wed, 17 Mar 2004 02:00:52 -0800, you wrote: >Hi all, >I am in the process of switching to SMT parts to save >on endless drilling for a run of devices (100+) and to >further reduce the size of the device. I am working >with 12f629s, so its only a 8 pin SOIC, but I need a >way to program the buggers before I solder them in the >circuit. ICSP is not really an option because of the >size and compactness of the device (even bare board). >There is definitly no room for headers. > >Is there any kind of socket or clip or something I can >use to connect to the bare SOICs long enough to >program and verify them? The only thing I have found >is for DIPs. > >Any experiences with this is apreciated :-) > >TIA, > Ben Hencke You can get SOIC test clips - 3M do one (923650-08)- not hugely expensive - about $15-20 Look at order code 178-278 at http://www.farnell.com/uk -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> Is there any kind of socket or clip or something I can > use to connect to the bare SOICs long enough to > program and verify them? The only thing I have found > is for DIPs. A soic test clip. Last time I went to the local elctronics shop I wanted to buy some 8-pin dip clips, but they sold me 8-pin soic clips for the same price. I did not object :) Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Depends on what your willing to pay....because there are services that can and will program these for you. Check with Arrow Electronics or your local distributor and see what they can do for you. {Quote hidden}>From: Mike Harrison <.....mikeKILLspam@spam@WHITEWING.CO.UK> >Reply-To: pic microcontroller discussion list <PICLISTKILLspamMITVMA.MIT.EDU> >To: .....PICLISTKILLspam.....MITVMA.MIT.EDU >Subject: Re: [PIC:] Programming SOIC chips before soldering >Date: Wed, 17 Mar 2004 10:28:36 +0000 > >On Wed, 17 Mar 2004 02:00:52 -0800, you wrote: > > >Hi all, > >I am in the process of switching to SMT parts to save > >on endless drilling for a run of devices (100+) and to > >further reduce the size of the device. I am working > >with 12f629s, so its only a 8 pin SOIC, but I need a > >way to program the buggers before I solder them in the > >circuit. ICSP is not really an option because of the > >size and compactness of the device (even bare board). > >There is definitly no room for headers. > > > >Is there any kind of socket or clip or something I can > >use to connect to the bare SOICs long enough to > >program and verify them? The only thing I have found > >is for DIPs. > > > >Any experiences with this is apreciated :-) > > > >TIA, > > Ben Hencke >You can get SOIC test clips - 3M do one (923650-08)- not hugely expensive - >about $15-20 >Look at order code 178-278 at http://www.farnell.com/uk > > > > > >-- >http://www.piclist.com hint: PICList Posts must start with ONE topic: >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads _________________________________________________________________ Find a broadband plan that fits. Great local deals on high-speed Internet access. http://click.atdmt.com/AVE/go/onm00200360ave/direct/01/ -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

I use the 12F675 for a product we manufacture. We solder the chip on empty, but along the edge of the board there are "touch points" where spring loaded pins attached to the ICSP make contact. We've programmed thousands this way. Our board is only an inch square, there is no header, and the process has proven to be very effective. Let me know if you would like more specific information. Jim {Original Message removed}

Sure they exist, for soic, for dip, for ... I found a site where they sell them yesterday, but I can't find them anymore. However, I did a quick seach on RS-Components.be (the American site didn't seem to have them?) and they have lots of them. Anthony --- Ben Hencke <EraseMEsimap2000spam_OUTTakeThisOuTYAHOO.COM> wrote: {Quote hidden}> Hi all, > I am in the process of switching to SMT parts to > save > on endless drilling for a run of devices (100+) and > to > further reduce the size of the device. I am working > with 12f629s, so its only a 8 pin SOIC, but I need a > way to program the buggers before I solder them in > the > circuit. ICSP is not really an option because of the > size and compactness of the device (even bare > board). > There is definitly no room for headers. > > Is there any kind of socket or clip or something I > can > use to connect to the bare SOICs long enough to > program and verify them? The only thing I have found > is for DIPs. > > Any experiences with this is apreciated :-) > > TIA, > Ben Hencke ===== Website: http://members.lycos.nl/anthonyvh __________________________________ Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam http://mail.yahoo.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Right on time guys, I'll have to solve this problem next week. Looks like digikey has the 3M test clips, P/N 923655-08-ND for gold plated 8 pin http://dkc3.digikey.com/PDF/T041/0279.pdf for the catalog page. Looks like the gold contacts are less than a buck more than the tin. Originally I was planning to solder down the chip and before any other parts are mounted, program in a fixture with some spring loaded pins contacting the open pads of the other parts, but this looks better. -Denny {Quote hidden}> Sure they exist, for soic, for dip, for ... > I found a site where they sell them yesterday, but I > can't find them anymore. > However, I did a quick seach on RS-Components.be (the > American site didn't seem to have them?) and they have > lots of them. > > Anthony > > --- Ben Hencke > > Hi all, > > I am in the process of switching to SMT parts to > > save > > on endless drilling for a run of devices (100+) and > > to > > further reduce the size of the device. I am working > > with 12f629s, so its only a 8 pin SOIC, but I need a > > way to program the buggers before I solder them in > > the > > circuit. ICSP is not really an option because of the > > size and compactness of the device (even bare > > board). > > There is definitly no room for headers. > > > > Is there any kind of socket or clip or something I > > can > > use to connect to the bare SOICs long enough to > > program and verify them? The only thing I have found > > is for DIPs. > > > > Any experiences with this is apreciated :-) > > > > TIA, > > Ben Hencke > > ===== > Website: http://members.lycos.nl/anthonyvh -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

--- Mike Harrison <mikespam_OUTWHITEWING.CO.UK> wrote: > You can get SOIC test clips - 3M do one (923650-08)- > not hugely expensive - about $15-20 > Look at order code 178-278 at http://www.farnell.com/uk Exactly what I was looking for, but somehow managed to miss! Its only $11 at mouser too. :-) Thanks, Ben Hencke __________________________________ Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam http://mail.yahoo.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

{Quote hidden}> From: Ben Hencke[SMTP:@spam@simap2000KILLspamYAHOO.COM] > Sent: Wednesday, March 17, 2004 5:00 AM > To: KILLspamPICLISTKILLspamMITVMA.MIT.EDU > Subject: [PIC:] Programming SOIC chips before soldering > Hi all, > I am in the process of switching to SMT parts to save > on endless drilling for a run of devices (100+) and to > further reduce the size of the device. I am working > with 12f629s, so its only a 8 pin SOIC, but I need a > way to program the buggers before I solder them in the > circuit. ICSP is not really an option because of the > size and compactness of the device (even bare board). > There is definitly no room for headers. > Is there any kind of socket or clip or something I can > use to connect to the bare SOICs long enough to > program and verify them? The only thing I have found > is for DIPs. > Any experiences with this is apreciated :-) > TIA, > Ben Hencke If you are willing to make your own, consider this: The pitch on an 8 pin SOIC is 0.050" (spacing between adjacent pins). This is also the spacing of conductors in mass-termination cable (Ansley, 3M, etc.) With only 8 pins to connect, you could take two pieces with 4 wires each, and strip back the insulation 1/16" on each conductor. Fasten each group of 4 wires to the edge of an insulated support and press each support against the chip leads from opposite sides. 1. Tin each exposed wire end to reduce problems from stray whiskers (strands) 2. If the leads are gull-wing type (usual on SOIC) arrange the plane of the leads parallel to the top of the chip package and press the leads down onto the horizontal part of the pins. 3. With J-type leads (rare), mount the supports perpendicular to the top of the chip and press them in from the sides. With more than 8 leads, this might be more trouble than it is worth, but only 8 should be easy. John Power -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

--- Jim Monteith <RemoveMEjimmTakeThisOuTSERVICEMATE.COM> wrote: > I use the 12F675 for a product we manufacture. We > solder the chip on empty, > but along the edge of the board there are "touch > points" where spring loaded > pins attached to the ICSP make contact. We've > programmed thousands this > way. Our board is only an inch square, there is no > header, and the process > has proven to be very effective. > > Let me know if you would like more specific > information. > > Jim I had tried something similar. The board is 2" x 1/2" but the PIC connections are crammed up near one end in about 1/2" square with no room to spare for a well layed out contact area. I had tried attaching several clips to various parts of the board, but that would be too slow. Fear of the Vpp clip slipping and shorting to something was also on my mind ;-) I think I can use one of the recommended SOIC clips (exactly what I was looking for) to program the chip. Thanks for all the help & suggestions, Ben Hencke __________________________________ Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam http://mail.yahoo.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

I use this brand of spring contact probes: http://www.idinet.com/ Paul {Quote hidden}> -----Original Message----- > [TakeThisOuTPICLISTEraseMEspam_OUTMITVMA.MIT.EDU]On Behalf Of redtock8 > Sent: Wednesday, March 17, 2004 7:27 PM > > Jim, > I would like to do this. Where do you get spring loaded > pins etc? Could you provide more info on how to do this? > > Albert > > RemoveMEredrock8TakeThisOuTalltel.net -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics