[SI-LIST] Re: Static power consumption
- From: steve weir <weirsi@xxxxxxxxxx>
- To: dp@xxxxxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Sat, 06 Aug 2005 11:14:52 -0700
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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