[SI-LIST] Re: Static power consumption
- From: "Dimiter Popoff" <dp@xxxxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Sat, 06 Aug 2005 21:28:36 +0300
Thanks, Steve. So I'll have to kiss goodbye the zero power at stopped
clock mentality which used to be around for quite some time...
Dimiter
------------------------------------------------------
Dimiter Popoff Transgalactic Instruments
http://www.tgi-sci.com
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-------Original Message-------
> From: steve weir <weirsi@xxxxxxxxxx>
> Subject: Re: [SI-LIST] Static power consumption
> Sent: Aug 06 '05 21:14
>
> Dimiter, leakage. Small geometries lead to lots of leakage.
>
> Steve.
> At 08:03 PM 8/6/2005 +0300, Dimiter Popoff wrote:
> >Hi all,
> >my background thoughts revolve around a future product, also with Freescales
> >mpc5200.
> > I want to make it battery powered, for which everything seems perfect,
> > except
> >the fact, that they specify 52.5 mW power consumption during the so called
> >"deep sleep" mode, which appears to mean all clocks stopped. (Full power at
> >400 MHz CPU speed being about 1W).
> >Now clearly 52 mW is way too much to keep the CPU constantly powered
> >so I'll have to do something about it (well, not many options but power off
> >together with the SDRAM).
> > My question to the list - where I know there are people with internal
> > chip knowledge - is
> >why is the consumption so high? I realise the total leakage of the
> >zillions of MOSFETs inside
> >can go pretty high, but the spec is at 25 C _die_ temperature, should it
> >not be a lot lower there?
> >Perhaps they overspecify, perhaps I am missing something (like something
> >ticking inside...),
> >or both, or neither?
> >
> >------------------------------------------------------
> >Dimiter Popoff Transgalactic Instruments
> >
> >http://www.tgi-sci.com
> >------------------------------------------------------
> >
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