Electronics > Projects, Designs, and Technical Stuff
Help me replace a QFP100 MCU with another MCU mounted on an interposer PCB
DC1MC:
--- Quote from: T3sl4co1l on May 09, 2020, 07:41:54 pm ---Trace the PCB's circuit, reverse-engineer and replicate it whole? With substitutions for available parts of course.
Tim
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This it maybe easy for somebody that does this for a living or as a hobby, I didn't know where to start and what program to use to produce some usable gerbers for production. Of course I can measure the board shape and size and position position of fixed components (encoders, LCD, connectors and so on). Putting this in a schematic capture / layout program is sadly beyond my abilities currently, what little AD I knew I've forgotten by not using it in the last 10yrs or so, and Kicad is fully alien to me :'(.
There are also some analogue bypass things that don't interact with the MCU (volume potentiometer and so on).
As the schematic with the new MCU will suffer significant modifications, I'm not sure if other than placing the fixed position parts will bring me, I need somebody that can really do layouting and did a few successful production runs as well, but unfortunately thisiis not the most interesting project and I'm not rich. In the end, assuming that the Italian seller is legit I can get one replacement assembly per month for 130+17EUR shipping, I was thinking to do something either very cheap or that I will lern form it.
JDubU:
--- Quote from: DC1MC on May 09, 2020, 06:49:50 pm ---29USD per piece is not that bad, do you know anything about that seller, or was just a search result ?
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Just a search result.
T3sl4co1l:
Well, what were you planning on doing anyway? An interposer needs to be designed, and it's probably going to need a schematic and layout for that. So will the rest of the board. Sounds like a learning opportunity either way. ;)
Tim
radar_macgyver:
I'd think it's easier to redesign the board to use a different display altogether of similar size (there are a lot of small OLED and TFT panels of similar size), make it match the dimensions of the existing PCB.
Miti:
The
--- Quote from: DC1MC on May 09, 2020, 10:20:47 am ---EDIT: Just to illustrate what I mean, I've added a picture of one of my PCBs with a hybrid module soldered on, it is exactly what I want to have, and I wonder how this technology is called and if a 0.5mm is feasible.
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Those are castelated holes or castelated pins. PCBWay offers that option but you can't make it that dense.
My advice, buy it from the Italian and try a different project for learning PCB design.
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