I don't know if we've really pinned down the computational requirements quite
yet, however you're definitely right that Cortex-M series blows everything else
out of the water. Microwatts/Mhz is really tough to beat!
________________________________
From: Steve Underwood <[email protected]>
To: [email protected]
Sent: Monday, 21 May 2012, 7:04
Subject: Re: [Freetel-codec2] Atmel 32-bit Floating Point, ADC on-board chips
If you really don't need more than the speed of the Atmel devices, and
want the very lowest power possible, various M3 devices beat it easily
for maybe $2 to $3.
Steve
On 05/21/2012 09:47 PM, Anthony Cutler wrote:
>
> My main concern with powerful ARM processors is power efficiency. We
> don't need 700MHz, and even with underclocking and power-saving modes
> I'm really curious how efficient these Corex A8s can get.
>
> The Atmel 32bit AVR UC3 chips pull .8mW/MHz:
> www.*atmel*.com/Images/doc7919.pdf <www.atmel.com/Images/doc7919.pdf>
>
> At 66Mhz this is roughly 50mW. Of course it depends on the radio, but
> it would be good to know what kind of power budget we have. I'm
> concerned if we're going to pull power from a battery we've really got
> to think about power efficiency too. Nothing annoys me more then
> something that eats batteries!
>
>
> -----------
> Cortex A8 SoCs at 700MHz or more can bought for $5 or less in medium
> quantities. There is no shortage of reasonably priced processors with a
> good peripheral mix these days.
>
> Steve
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