Re: What is the lowest power dsp ?


"Randy Yates" <yates@xxxxxxxx> wrote in message
news:1125411735.783786.255790@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> The Blackfin is very fast. If you run at
>> a reduced clock, it may still be fast enough for your application and
>> operate at low power.
>
> Actually that brings up a good point, Al. If you utilize the sleep mode
> of the DSP (whatever the manufacturer), so that the "real work" is
> performed in short bursts and the rest of the time the processor
> remains asleep, you may be able to get very decent power
> consumption performance. I think price will bite you, however,
> for anything like a Blackfin or C55/6x when compared with the
> MSPxxx family.
>
> --Randy
>

That is a good point. The MSP430 derives much of its low-power
characteristics from this principle. Its standby current is ultra-low so
with the device waking up very infrequently the average current consumption
approaches the sleep current.

The 55x DSPs have low sleep current as well. Let me qualify that by saying
it's very low for a DSP (I think that's sort of like "runs fast for a
catcher"). From what I've seen comparing Blackfin and 55x it appears the
Blackfin has lower operating current than the 55x but the 55x has MUCH lower
sleep current. So for many real-world applications you end up with lower
average current consumption using 55x than you would with Blackfin.

My two cents...

Brad


.

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