Power management concept...
openmoko at mauve.plus.com
Tue Apr 24 13:55:28 CEST 2007
Nils Faerber wrote:
> Personally I would be much more interested in slow-mode than in
> suspend/power-off. As I described it would allow (slow) applications
> running all the time without much power consumption. This would be a
> very interesting feature.
Annoying things about slow mode.
Uses several (3-5) times more power per MIP than fast mode.
USB does not work, so no bluetooth.
LCD controller does not work, so no display (unless as I've speculated,
the LCD - as some can, can be written from the SPI bus).
CPU alone in slow mode uses some 1/3 of the battery per day.
Things that are possible - GPS, GSM, audio in/out (though there is not
enough CPU to decode OGG/MP3/...).
It may well in many applications be better to - if it can be done
rapidly - suspend to RAM for 5 seconds and wakeup for 1 second, in fast
mode, repeatedly, rather than sitting in slow mode.
This probably uses less power, and you can use the bluetooth module when
you are awake.
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