[gta02-core] Next phase: the schematics

Werner Almesberger werner at openmoko.org
Thu Jun 18 02:00:45 CEST 2009

?lvaro Lopes wrote:
> I had to write a new resistor symbol (the one US-like, with a zigzag
> line). It's not perfect but should be enough for our needs.

Looks nice. I've added it to the library and the expanded view.

> Another symbol we need is an inductor - Kicad's is too large, and seems
> to have a width non-divisible by 50mil.

Hmm, it's 100 mil (2 grid points) longer than the resistor, but seems
to be perfectly on-grid.

> The power pins are "VAA" with a 0.5mil font size.

Ah, nice. But the larger text now overlaps the circle. I think we need
a new symbol for our powers.

> I also added a "Tolerance" field to resistors that depict their low
> tolerance.

Great !

> I'm avoiding as much as possible to cross wires, so you might see
> many power pins all around (like VBAT_SYS). I think this makes
> design more readable.

I like that. But at EXTONx, you made one of those evil crosses.
(Openmoko did plenty of them too :-( )

If you "Plot" the sheet to Postscript, you'll see that the circle
is hard to spot. So it would be better to use an inverted F shape,
with VB_SYS on top of the vertical line.

> We also have a lot of NC resistors, maybe we should get rid of some..

Yeah, there's a lot of stuff that's left over from R&D ...

> I'll resume my schematic work on PMU tomorrow. Until then :)

Excellent. Thanks a lot !

- Werner

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