Post by thread:Programming smt PICS

On Mon, 1 Mar 1999 17:55:57 -0000, you wrote: >I have a bunch of smt SOIC PICS (12c508/16f84) to programme. The only socket >I have seen to take them costs £60 ($100)! > >Can anyone suggest a lost cost way other than hand crafting some form of >multipin clip? > >Stuart A SO IC test-clip, wired to a DIL header works pretty well, use the black 3M ones, not the blue ITT-Pomona ones, which are crap. Farnell do them - 178-278 (8 pin, ukp8.25), 178-282 (20 pin, ukp11.12). You can get 18 pin ones, but I can't remember where from. Farnell also do SO ZIF sockets (catalogue p.1443), which you can use to make a programming adaptor.

>I have a bunch of smt SOIC PICS (12c508/16f84) to programme. The only socket >I have seen to take them costs £60 ($100)! > >Can anyone suggest a lost cost way other than hand crafting some form of >multipin clip? I have heard that someone uses a small board with appropriate SMD pattern and connects the chip via a rubber zebra strip from old wrist watch. Maybe something glued on for propper alignment. That way they program 16F84/S. Never tried myself. Josef Hanzal ====================================================================== Electronical devices for chemical laboratory, custom electonics design ---------------------------------------------------------------------- Snail Instruments Josef Hanzal Vojanova 615 phone/fax: +420-311-24433 266 01 Beroun e-mail: .....snailKILLspam@spam@iol.cz Czech Republic URL: http://www.vitrum.cz/snail/ ======================================================================

Hi, > I have a bunch of smt SOIC PICS (12c508/16f84) to programme. The only socket > I have seen to take them costs £60 ($100)! I know, I bought an expensive socket. On the plus side this socket I bought will take almost any SMT package. > Can anyone suggest a lost cost way other than hand crafting some form of > multipin clip? For some SMT packages it's possible to get cheap open top sockets where you put the chip on it and then pop a cover on top of that. I couldn't find one to fit a 12C508 but maybe for the 16f84 you could. http://www.edi-adapters.com have a universal adapter for $60 but bad service to go with it, I tried to order from them but gave up eventually. http://www.enplas.com also have sockets, I've gotten nowhere with them either but maybe you'll have better luck. The part number for the 12C508 socket is: FP-8(16H)-1.27-06 (I don't know why I'm giving all these bad service companies free publicity (-: )... There were some other names in my head but I can't access them at the moment :-) give your local sockets guy a call. If you want to program these on the board but avoid the in-circuit programming resistors etc. you can expose the relevant signals somewhere on your board (finger on the edge or holes) and do the assembly in two steps. 1) solder just the PICs 2) program 3) solder the rest. If you follow the SMT clip way someone suggested you should know the 3M SO8 clip (thats in the Digikey catalog) will not go on a 12C508, it's too wide... make sure your clip/package fits the chips physically. Hope this helps, Guy - mlsirtonKILLspaminter.net.il

part 0 1664 bytes > Hi, > > > I have a bunch of smt SOIC PICS (12c508/16f84) to programme. The > only socket > > I have seen to take them costs £60 ($100)! > > > Can anyone suggest a lost cost way other than hand crafting some > form of > > multipin clip? > [snip] > http://www.enplas.com also have sockets, I've gotten nowhere with them > either but maybe you'll have better luck. The part number for the > 12C508 socket is: FP-8(16H)-1.27-06 > [snip] > If you follow the SMT clip way someone suggested you should know the > 3M SO8 clip (thats in the Digikey catalog) will not go on a 12C508, > it's too wide... make sure your clip/package fits the chips > physically. > I found a SOIC clip that fits nicely onto an 8-pin SMT PIC. It's from ITT-Pomona (they are on the net, http://www.pomonaelectronics.com/), part #5250. I ordered it through a company called Hughes-Peters. cost was around $9 plus shipping. don't know how applicable it is for programming; i'd be afraid that the tension of the spring would break off (or at least bend) the fragile gull-wing leads. however, you could remove the spring, and use a small rubberband to hold the jaws together. The other end of the clip fits into the ZIF socket of my PICSTART+ programmer. i'm not going to do that to my only SOIC clip, but if someone does try this, please post results to the list for our future enlightenment (or at least mine, i'm sure there will be a need sometime in the future).

Thanks to those who contributed suggestions on low-cost ways to program a few SMT PICS. After some trials, I have successfully blown some smt 12c508s. I couldn't source a suggested test-clip to the required wide soic spacing. I made up a pcb with the appropriate pattern, connected to a dil header to fit my programmer. The Pic was held in place by spring-loaded tweezers (a sprung clothes peg also worked..). Extremely fiddly, and I had to carefully ensure the gullwings held the body of the pic off the board (ie bend them slightly) before a pin-by-pin continuity check was successful. Then worked fine. However, I now need to program yet more, so I will keep searching for a better solution... Stuart Meier

Hi Stuart and others, I am using the PIC12 SMD device. I have laid out my final PCB to track all the pads from the SMD device to DIP8 pads on the other side of the board. I have then made up a small "bed of nails" with some spring loaded pins and guide locaters. I place the bed of nails into my programmer. Then, with just the PIC12 soldered to the PCB, place it onto the nails. While holding it in place I hit the program button! (Need to come up with a better way to hold it..) I have so far programmed 10 chips successfully. Hope that gives you some other ideas! Regards Peter Mcalpine .....petermcaKILLspam.....ozemail.com.au - http://www.ozemail.com.au/~petermca EraseMEmcalpinespam_OUTTakeThisOuTgme.net.au - http://www.gme.net.au http://www.wrx.org.au {Original Message removed}

Hi Stuart, Sorry I missed earlier posts but the converter you are looking for should be available from MQP Electronics. They produce converters to fit a majority of chips so they can be easily programmed in standard programmers. They are a UK company so they should be easy for you to source. See the link below. http://www.mqp.com/ Peter G > {Original Message removed}