Propeller P2 Edge module 3D models?
pedward
Posts: 1,642
in Propeller 2
I see Parallax has some 3D models for the connector and the TQFP, but I couldn't find any models for the P2 Edge module.
Is anyone working on a model, or need a nudge? I'd love to be able to render a P2 Edge module in one of my board designs.
Comments
Edge step
https://drive.google.com/file/d/1I1Jv4hsFu68UfKdiU76TlSlxIOkJ8AIB
Edge 32MB step
https://drive.google.com/file/d/1UtTrpcuI4soJBl6qvN-a__xFbkC7mHd8
Nice, I was looking for these too. Thanks @VonSzarvas
Danka!
Here's my resulting render:
Wow- huge panel!
What are the dimensions of that green beast? Looks similar to an old ATX motherboard.
Looks thin too. Guess you'll have some sort of support on the underside- at least under all the sockets? Do you think it will bend much where it's going?
Something very calming about looking at those ceramic coated tant caps!. Usually a good price too. Great for these projects and a joy to see. Win win!
It's ~8x8 inches. This is intended to live on a workbench, so rubber feet or plastic standoffs in the mounting holes.
This is what will plug into it:
Yes, that's S100 bus
It's prohibitively expensive to make boards that are 10x5.25 except from off-shore fabs. I got a quote of $264 from OSHPark and $594 from Sierra Proto
One hell of a battery backup memory system you have there pedward if it's Li-ion. An 18650 cell or a smaller 14450 one? That's already 1-2.5 amp hours . Should last a good century or so on a couple of microamp draw before it runs out (except for its self discharge unless the diode reverse leakage can recharge it for some of the time).
It's not a bad solution. I wonder what's the best type of battery for least self discharge these days. That's the limiting case here for sure if it needs to retain memory for years.
It'll be a regular 3 volt lithium. More commonly seen as button cells. Yes, they can indeed run for 100 years.
They're full of a watery liquid that, when broken, fumes and eats many materials, including skin. Discoloured all my tools but I managed to run for it before breathing any luckily.
These boards use a Tadiran lithium thionyl chloride (LiSOCl2) battery, it's an AA 2400mah at 3.6v. I have one in my original CPU board from 1991 and it still has a 3.692v charge. According to the datasheet these should do about 30yr at 2ua. This board only has 4 chips, so the load is low.
The newer boards Fadal built had a 1F supercapacitor in parallel with the battery, so when the system is powered up it will charge the supercapacitor via a 100 ohm resistor, then it'll discharge through a parallel schottky diode. It seems redundant to have a diode in parallel with the resistor, but couldn't hurt.
My memory board design has 1 chip, so basically it's a lifetime battery
The battery is isolated with a plain 1N914, but I've upgraded them to 1N5817 schottky diodes, which are ~.35v Fv.
The discharge curve of the Tadiran batteries is like a knee, so perhaps it really doesn't matter if you have a schottky diode or regular 1N914.