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???
01/24/07 18:57
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 		 #131419 - 1 sided...
Responding to: ???'s previous message


Truth is Erik, I'm just gearing up to try it. I've been playing with the freeware version of Eagle, and it constrains me to a rather small two layer board.

I tried laying out the standard 40 pin PDIP '52 + latch & SRAM and MAX232 over the weekend, and it takes up a sizeable percentage of the available board space. Switching to a PLCC package cuts my chip footprint from 702 mm^2 to 306 mm^2. If I want to try the fine pitch soldering, I can get it down to 144 mm^2 with the TQFP. Not drilling is just kind of a bonus, though I suspect I'll be sending Cadsoft some money soon.


If I can get a 90% routed solution on a one sided board, and use "zero ohm" resistors for the second side I can escape the image registration issues too, which would be nice for homebrew etching. High speeds to be avoided due to lack of ground planes obviously...




List of 70 messages in thread
TopicAuthorDate
BUS            01/01/70 00:00      
   does not make sense, pls explain            01/01/70 00:00      
      100 mils width is too small            01/01/70 00:00      
         Use 8052.com            01/01/70 00:00      
         in one direction, in the other it is .100            01/01/70 00:00      
         Drilling holes with 100 mil pitch should not be...            01/01/70 00:00      
            None at all!            01/01/70 00:00      
            The largest drill diameter is 0.050"            01/01/70 00:00      
               It's all coming back...            01/01/70 00:00      
                  What do you mean "coming back?" It's still here!            01/01/70 00:00      
                     the rest of us regard this a trip down memory lane            01/01/70 00:00      
                        Yes, paper clips, zippers ... they're still around            01/01/70 00:00      
                           yup, slow things down            01/01/70 00:00      
               It is 0.80mm NOT 0.080"            01/01/70 00:00      
                  One's too small, the other's too large            01/01/70 00:00      
         It\'s really not too small ...            01/01/70 00:00      
         Terms; Width v Pitch            01/01/70 00:00      
   if it is all or none            01/01/70 00:00      
      I'm using a Single Sided board...            01/01/70 00:00      
         I don't understand...            01/01/70 00:00      
            yes            01/01/70 00:00      
               If you mean what I think you mean.            01/01/70 00:00      
               use an IC socket then...            01/01/70 00:00      
                  a good ides does not suffer from being repeated            01/01/70 00:00      
                     I missed that, sorry...            01/01/70 00:00      
                        what is a "component platform"?            01/01/70 00:00      
                           thanks            01/01/70 00:00      
                              here we go            01/01/70 00:00      
                                 oh now I remeber            01/01/70 00:00      
                                    they are available in 0.3" as well            01/01/70 00:00      
         nowadays, ridiculously small is REALLY small            01/01/70 00:00      
            Broken bit.            01/01/70 00:00      
   PCB Prototyping            01/01/70 00:00      
      Drilling...            01/01/70 00:00      
         great, Rob            01/01/70 00:00      
            1 sided...            01/01/70 00:00      
               you are aware, I hope            01/01/70 00:00      
                  SiLabs, etc...            01/01/70 00:00      
                     not at all            01/01/70 00:00      
                        So is the 89C51ED2            01/01/70 00:00      
                           there are PLCC sockets that spread the pins to 0.1            01/01/70 00:00      
                              Yep.            01/01/70 00:00      
                                 ok            01/01/70 00:00      
                                 you don't have a proper devboard            01/01/70 00:00      
                                    Devboard            01/01/70 00:00      
                                       do yourself a favor            01/01/70 00:00      
                                          Thanks            01/01/70 00:00      
                              There are adapter boards that make it easy            01/01/70 00:00      
                                 You can add a groundplane!            01/01/70 00:00      
                                    not just Kai            01/01/70 00:00      
                     SiLabs vs Atmel            01/01/70 00:00      
                        elaborating            01/01/70 00:00      
                           deviates            01/01/70 00:00      
                              the problem there is            01/01/70 00:00      
                                 diffs twixt SiLabs families            01/01/70 00:00      
                                    To Andy            01/01/70 00:00      
                                       LPC9xx???            01/01/70 00:00      
                                 RCAP2 vs TMR2RL            01/01/70 00:00      
                                    acronyms...            01/01/70 00:00      
                                    If that had been it            01/01/70 00:00      
                                       F120 not genuine either            01/01/70 00:00      
                                          the difference is 'addition' vs 'change'            01/01/70 00:00      
            SMT Soldering is MUCH easier than PWB drilling.            01/01/70 00:00      
               wrong address            01/01/70 00:00      
               surface mount thru-hole            01/01/70 00:00      
                  Original SMT parts were modified DIP            01/01/70 00:00      
                     True but...            01/01/70 00:00      
                        The objective wasn't to make them smaller.            01/01/70 00:00      
                           O-Who?            01/01/70 00:00      
            Just to follow up...            01/01/70 00:00      

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