I'm having one hell of a time routing traces on a board I've been trying to route for a week now. The board is 15.05" x 3.02 inches, has the following components:
384 x 0805 resistors ~24 x 0805 capacitors 24 x 52QFP IC's 24 x 32x32mm LED matrix boards (24 PTH pins each) =576 PTH holes 1 x 16pin Header
Needless to say, the board is packed. I tried using SO-16 resistor networks to cut down on the number of resistors, but due to the closer spacing, this actually made routing more difficult.
Due to costs, I'm trying to keep this board a 2 layer board, but am finding it extremely hard. I tried to manually route the layout, but found that to be extremely hard to do, so I went with an autorouter (www.freerouting.net, java based router). After much trial and error, I was able to route the board, however I had to use the following numbers for my layout:
Signal traces: 0.1mm (~4mil) traces/0.2mm (~8mil) spacing 5V power traces: 0.2mm(~8mil) traces/0.2mm spacing Smallest hole:0.2mm
I used a Trace Width Calculator to come up with the numbers above given a max load of 1A possible, but not sure if those numbers will work.
My question is, given the following datasheet information regarding the LED matrix displays, and the LED drivers, will those widths be enough, or do I need to go larger to be safe?
LED Matrix forward Current: 20mA @ 2.3V (reverse voltage: 5v)
Driver Row Sink current: 16mA @5v Driver Row Source Current: -70mA @5v Driver COM(common) Sink Current: 350mA @5v Driver COM Source Current: -60mA @5v
I can post the datasheets if necessary.