Hi All,
I have a major problem (at least it is for me!), I used a 44 pin plcc schematic symbol, but the PCB itself has a 44 pin tqfp footprint :-(. The positions of the signals on the chips are the same, but of course qfp packages have pin 1 in a corner while plccs have pin one half way along one edge. So, I need a method of converting the pinout.
Any suggestions? I was thinking of a small PCB about the same size as the TQFP footprint with a TQFP footprint on both sides, using a solder mask and paste to connect that to the main PCB. I would effectively be creating an LCC with a pin-swizzled TQFP on the top. I have two prototypes already built and another 8 PCBs that I don't want to chuck away.
The things that worry me are:
1) would the solder connections be reliable? 2) What chance of shorts/opens? 3) Power would have an extra few mm to trace out without very close decoupling.Any views?
Mark.