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Public Service Announcement - QFP variant of the 68030
Posted: 06 Aug 2020 20:28
by Badwolf
The QFP variant of the 68030s have pin number one in the middle of a side rather than on a corner.
This is probably worth noting when selecting an appropriate footprint for your PCB design as I imagine you'd feel quite stupid if you only realised this after spending half an hour searching for the short from VCC to GND on your soldered up new board.
I imagine. :oops:
BW.
- IMG_3734.jpeg (259.27 KiB) Viewed 2839 times
Re: Public Service Announcement - QFP variant of the 68030
Posted: 06 Aug 2020 20:33
by exxos
:o Can you post images of both the pinouts ?
Re: Public Service Announcement - QFP variant of the 68030
Posted: 06 Aug 2020 20:41
by Badwolf
It's quite obvious, especially when looking at the damned chips -- big hard to miss dot right in the middle of the side -- I'm just an eejit! :lol:
BW.
Right:
- Screenshot 2020-08-06 at 20.35.35.png (166.06 KiB) Viewed 2823 times
Less Right:
- Screenshot 2020-08-06 at 20.37.51.png (139.21 KiB) Viewed 2823 times
Re: Public Service Announcement - QFP variant of the 68030
Posted: 06 Aug 2020 20:46
by exxos
Ah, looks like you used a generic package lib not a 030 one then ?
Re: Public Service Announcement - QFP variant of the 68030
Posted: 06 Aug 2020 20:56
by Badwolf
exxos wrote: 06 Aug 2020 20:46
Ah, looks like you used a generic package lib not a 030 one then ?
Yeah -- I used an 030 specific schematic symbol, but not footprint. Spent all time making sure my schematic pins were correct (they were) but I didn't notice the funky numbering system.
Next revision will be back to PGA anyway as I found the QFP version an absolute bugger to solder. The pins are so long and flimsy it's like trying to tack down bakofoil. Had them, so I thought I'd give them a go on this board spin, but were never going to make it to a final design anyway.
BW.