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Article #1561Re: HP chip model planes
From: David L. Jones
Date: Sun, 25 Jan 2009 09:47
Date: Sun, 25 Jan 2009 09:47
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3608 bytes
On Jan 25, 7:17 pm, Raymond Wiker <r...@RawMBP.local> wrote: > "David L. Jones" <altz...@gmail.com> writes: > > > > > The latest 12C actually uses an Atmel ARM processor (as in the new > > 20B) running the original 12C ROM using the Nonpareil emulator: > >http://nonpareil.brouhaha.com/ > > > Rumor has it further Voyager models (11C, 15C etc) will be re-released > > with this method. > > How does the ARM.based version compare with the old version, > in terms of speed and battery life? I would not be surpised to hear of > an 11C that was still on its original set of batteries :-) I haven't head about the new 12C as apparently it's quite hard to find and identify them on the shelves, and only sold in Europe or somewhere so far? If the new 20B is anything to go by (and it should be because it's the same processor) then battery life it will be a shocker. Rated 9 months from two CR2032 batteries. IMO HP goofed big in the design of the 20B. It works at 30MHz for all calculations (then goes to sleep), but that means 15mA or so from the two CR2032 batteries. This means big losses in the battery internal resistance when doing calcs. When I queried one of the HP designers about this on another forum, I got the response that the CR2032 batteries have an IR of 5 ohms (IIRC) and everything was fine and dandy. Well, they must be real special batteries they are using because normal CR2032's start at 20ohms IR and go up. I can dig out the actual figures I came up with from the other forum if needed, but it was I think something like 30% at least of the computational power wasted in the battery IR. Crazy design. Also, there was some concern about the low battery detection logic not working properly. Dave.
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