I am using a PIC18F87K22 PIC in a TQFN-80 package in a design I am creating. I created the part in a library and copied the TQFN footprint from another project. Everything on my board will route with the autorouter apart from this part. I tried manually routing a tiny section of wire from each of the pins out by a 1 or 2 mm and then tried the autorouter again then it worked.
The pads of the TQFN part are 0.3mm x 1.2mm and I set the grid of the PCB to 0.1mm and I also set the routing grid setting to 0.05mm and still cannot get it to auto route. I know people will say why bother with the auto router just do it manually but I really want to use the autorouter. I reduced the size of the net class down to 5mil still with no luck. I have larger SMD parts - SOIC 16 and they auto route fine.
Can anyone make any suggestions?