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Subject: Re: firmware powermgmt.h,1.1,1.2
From: George Styles (george_at_ripnet.co.uk)
Date: 2002-08-06


Thanks for that answer :)

g

----- Original Message -----
From: "Heikki Hannikainen" <hessu_at_hes.iki.fi>
To: <rockbox_at_cool.haxx.se>
Sent: Tuesday, August 06, 2002 1:59 PM
Subject: Re: firmware powermgmt.h,1.1,1.2

> On Tue, 6 Aug 2002, George Styles wrote:
>
> > Can some kind person explain how the charging mechanism works on the JB
> > please? the way I understand it is that it always runs off the
battaries,
> > and when it is charging, it charges the battaries at the same time, but
not
> > as fast as using it discharges it. is this correct?
>
> This is correct.
>
> > what is meant by charging in discharge and charge?
>
> When the 'Deep discharge' mode is enabled in the settings menu, the
> charger will start only when the battery is under 10% capacity
> (CHARGE_RESTART_LO). When the 'Deep discharge' mode is disabled,
> the charger will start when the battery is under 90%
> capacity (CHARGE_RESTART_HI).
>
> The deep discharge mode is intended for users who keep the device
> connected to a charger all the time (fixed-location mains-powered usage)
> and want to reduce possible memory effects (which aren't supposed to be
> too bad on NiMH batteries, but some manufacturers do recommend against
> trickle charging NiMH cells).
>
> With deep discharge mode disabled the battery is guaranteed to be at
> least 90% charged after an overnight charge.
>
> > finally, the new 6 hour max charge time, does that get reset if you pull
the
> > plug, and re-insert it?
>
> Yes. This is just a backup timer to stop after 6 hours of continuous
> charging in case the 'battery full' detection fails for some reason. The
> timer should not fire in any normal case.
>
> One additional note, the charger code currently only runs once per
> minute, so it will not notice changes in charger status immediately.
>
> - Hessu
>
>
>



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