DIYEFI.org Forum

What part of this unique design actually classifies as "ripped off IP"? 1) MS2 chips: bought on the open market 2) Components: bought on the open market 3) Layout: unique, implements functions of purchased components I'm a big IP fan. Truly. The vast majority of items are not IP. I've bee...

Yeah, saying we did it wrong because there wasn't room doesn't make it right. If it's super well documented, maybe it's ok, but so far most things you're supposed to "know" not to do in the MS world are secrets only those in the inner circle know about. I've run across these issues myself...

Fred wrote:And this is what I was referring to ^

Yea I see that. That 'open drain' configuration is about as common of a voltage level shift method as anything. Without using discrete components that is. Maybe they'll be room on your board to use discrete resistors.

That is more like it! :-) Maybe we can be friends afterall. Now, the 8 control lines from the router processor also need limiting as well. But - there is simply no more room left on the board for 8 resistors. So, we are using a little trick. The HCS12 processor ports can be configured as inputs or ...

The latter only requires a software misconfiguration to burn. IMO that is a hack. The fact that it has been done before doesn't change that really. What do you mean by that "misconfiguration to burn" phrase? I see on the prev. page where you think an output vs. an output causes damage thr...

There is a vast difference between what they do in that pdf link and what Bruce/Bill have done. The latter only requires a software misconfiguration to burn. IMO that is a hack. The fact that it has been done before doesn't change that really. You think it represents bad design. And you think you k...

Sure Jean. The example I gave above was from work I did in 2000. The UL lab raised only the slightest eyebrow to see what was was happening in the circuit. Here is a link to an app note from Microchip. http://ww1.microchip.com/downloads/en/AppNotes/00521c.pdf There are more references out there, man...

I'd be curious to hear what the Freescale people would think about that one: driving a 3.3V device from a 5V one by using the pin as an input. That's a clever hack for bench testing but an automotive environment is not a friendly one for hacks. But it's going to be interesting to see what happens w...