Operation out of spec is never a good idea. Gerald
On Thu, Oct 10, 2013 at 4:13 PM, <[email protected]> wrote: > The answer is going to be that while android works fine on that board and > the ubuntu build works at room temp but not after a -20 cold soak on THAT > board, neither one might work on a different board after a -20 cold soak. > > This is my personal experience with cold temperature testing on hardware > and I did a whole lot of that back around the early 1990s. The problem is > very likely with the 3.3v power. The Ubuntu build might touch a feature or > enable a component that the android build doesn't and you might be right on > the very hairy edge of having enough 3.3v current available at -20C to > make the thing operate with android but not with the ubuntu build until it > warms up a little bit. The fact that one works and the other doesn't at > -20C might just be a fluke of the tolerance build up of all the components > of that board. On another board neither one might work. On yet another > board maybe both will work, BUT (and this is very important) neither one of > them is guaranteed to work because the components on that board are not > rated for -20C. In fact, it might work this week but might stop working at > -20C next month. Seriously. You are probably chasing your tail looking > for a correctable problem when you are using the hardware outside of its > design spec. Yeah, it might work -- sometimes -- under just the right > conditions -- maybe. Cold does funny things to semiconductors, > particularly voltage regulators. In fact, getting power supplies to start > was the number one issue in getting gear to turn on after a cold soak at > maximum rated cold temperature. Operating at 20 degrees below minimum > rated low temp is no different than trying to operate at 20 degrees above > maximum rated high temperature. It might work -- for a while -- maybe -- > and the results will not be repeatable from one board to the next. Your > best bet if you want reliable service is to get someone to build you a > board with components rated for that environment. > > > > On Thursday, October 10, 2013 4:50:20 AM UTC-7, Kets wrote: >> >> Hi George, >> >> Point noted about industrial grade of the beagle board components. But I >> have not understood why Android build works fine. Any pointers towards this? >> >> Regards, >> Ketan >> > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
