[maemo-users] What is Best practice for Battery Longevity on N8X0?

From: Igor Stoppa igor.stoppa at nokia.com
Date: Thu Feb 14 16:17:38 EET 2008
On Thu, 2008-02-14 at 14:08 +0100, ext Frantisek Dufka wrote:
> Igor Stoppa wrote:
> >>> n800: 18 days
> >>> n810: 27 days
> >> Impressive, any details where the savings were done? Is this strictly HW 
> >> related and the n800 has same OS2008 version as N810?
> > 
> > it's both hw and sw; the sw part is about fixing wrong settings in muxing,
> > pullup&pulldown and disabling voltage regulators when not in use or OMAP
> > is in retention.
> Just to confirm, these 18 days are already on N800 with OS2008 and with 
> those sw issues fixed?

I don't remember if i checked exactly the sw version that is public atm
but if it wasn't then it was close enough.

> >>  Do the LEDs 
> >> in N810 still eat CPU power when blinking?
> > 
> > No, there is a dedicated, programmable chip, nickname NJoy, which takes
> > care of it. A similar one is in the keyboard controlled and provides
> > backlighting.
> > 
> > I posted some time ago a link to the public (and complete!) datasheet on
> > ITT, in the easter egg thread, iirc.
> Found it, thanks, here are the links
> http://www.internettablettalk.com/forums/showthread.php?p=100358#post100358
> http://www.internettablettalk.com/forums/showthread.php?p=100373#post100373
> The page http://www.national.com/pf/LP/LP5521.html mentions also
> "Comprehensive application tools are available, including command 
> compiler for easy LED sequence programming." but there is no download 
> link. One perhaps needs to contact them and this complier may not be 
> free (as beer).

Or one could write the compiler :-)
The language is not so rich


Cheers, Igor


Igor Stoppa
Next Generation Software
Nokia Devices R&D - Helsinki

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