PICdude wrote:
> 24 SOIC?  Compact, compact, and more compacter.

If you want a self-contained module, 24 SOIC is a physical impossibility. :) 
For example, the ISO drivers require that you pull up the K- and L-lines to 
Vbat+ via 510 ohm resistors. If you do the math, it becomes clear that even 
an 0805 doesn't have enough power dissipation.

The fact is, microOBD 200 is currently the smallest commercially available 
OBD module in the world. The closest (and as far as I know, the only) 
competitor is literally x3 the size (and x2 the cost).


> Actually a SIP
> package would be nice.

Actually, we built one last year:

http://www.scantool.net/scantool/downloads/44/microobd-product_brief.pdf

You could use it with 90-degree pins if you wanted to. We even have the 
development board for it. :)

microOBD 200 was developed based on customer feedback. We made it physically 
smaller, functionally more flexible, and a DIP24 with real lead frames is a 
lot more stable mechanically, when mounted in a machined socket.


> From what I know of the ELM327, I'm not sure
> why you'd need so many interface pins.  But I'll wait for your docs
> before I think of hacking down the size.

Look at the brief, it shows the pinout, w/ pin descriptions. The actual chip 
is a 28-pin TQFN, we plan to make it available as a stand-alone OBD chip 
later this year. If we get a sizeable order we'd be happy to make it 
available sooner. ;)


> I'll chat with you offlist a bit later about some specifics.

Please email me at vitaliy@scantool.net.

Vitaliy

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist