Re: Allegro 3977

I've done a number of one-off PCBs for personal projects, and have
given up on trying to run with the big dawgs... I only do one sided
boards, and I put in lots of wire jumpers to get leads across each
other. Way easier, and unless you're in competition with Matsushita,
cost is non-issue.
Side benefit: Easy to put in high current "traces" without taking up
the whole board.
patmat

> Seriously, I've been fooling around with a first attempt PCB for

this

> beast, but I've never seen such an ugly pinout. What the heck is

the

> STEP input doing way up in the left hand corner??? Most people

want

> to bring out the motor phase lines to a connector right next to

each

> other, so where do they put them on the chip? One on each corner,

as

> far away from each other as possible! No idea how to do this

without

> a bunch of vias in 2+ amp current paths. ...
> - Tom S.