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'[PIC] Low power function required'
2007\05\07@153341 by James Salisbury

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> Hi,
>
> I am looking to use a pic as a custom LED flasher, what is the lowest
> power part when clocked with a 32KHz crystal?
>
> Thanks
>


2007\05\07@160630 by Nicola Perotto

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Hi James,
I am looking for a car. What is that with lowest petrol use?
I'm joking but not so much: "custom led flasher" is not enough; we need
more informations!
         Nic


James Salisbury wrote:
{Quote hidden}

2007\05\07@162032 by James Salisbury

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Hi,

I am just wanting to use the PIC as a replacement for a 555  timer, so the
12F series would do fine. Preferably PDIP package so I can use veroboard.



{Original Message removed}

2007\05\07@164319 by Nicola Perotto

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Maybe a 10Fxxx can be your pic! PDIP 8, 370uA at 4MHz, 4 I/O, no
peripherals only timer0.
There are with or without ADC.

James Salisbury wrote:
> Hi,
>
> I am just wanting to use the PIC as a replacement for a 555  timer, so the
> 12F series would do fine. Preferably PDIP package so I can use veroboard.
>
>
>
> {Original Message removed}

2007\05\07@164812 by wouter van ooijen

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> I am looking to use a pic as a custom LED flasher, what is the
> lowest power part when clocked with a 32KHz crystal?

Why a crystal at all? Take a any micropower PIC and use its internal
oscillator. Or does your flasher need 50 ppm accuracy?

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu



2007\05\07@170952 by Timothy Weber

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James Salisbury wrote:
> I am just wanting to use the PIC as a replacement for a 555  timer, so the
> 12F series would do fine. Preferably PDIP package so I can use veroboard.

In that case, I'd recommend the 12F series.  ;)

But yes - I would go with the 12F683, since it's the only one with an
LFINTOSC low-power internal clock mode.  It's spec'ed at 11 uA typical
in that mode at 2V.

If you need to use an external crystal for some reason, then you could
also use the 12F629 in its LP mode (32 kHz external clock) and you might
get lower power usage (spec'ed at 9 uA @ 2V).

You could probably use a 10F too, but I haven't used them personally.
--
Timothy J. Weber
http://timothyweber.org

2007\05\07@172650 by James Salisbury

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Hi,

Looking at the specs for the 12F675 lp mode with 32 KHz xtal 5V 35 uA
typical. Internal  Ossc 4MHz 800uA typical.
{Original Message removed}

2007\05\07@175758 by Rolf

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You ahould really consider the 10F parts. Amall, simple, efficient.

Rolf

James Salisbury wrote:
> Hi,
>
> Looking at the specs for the 12F675 lp mode with 32 KHz xtal 5V 35 uA
> typical. Internal  Ossc 4MHz 800uA typical.
> {Original Message removed}

2007\05\07@182444 by Rolf

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Apparently aomeone moved my 'a' key to where the other letter ahould be ;-).

Rolf

Rolf wrote:
> You ahould really consider the 10F parts. Amall, simple, efficient.
>
> Rolf
>
> James Salisbury wrote:
>  

2007\05\08@174812 by Tamas Rudnai

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I love 10F series simply because it's small, however, it is only smaller
than 12F683 if you use the SOT23 package (much smaller than SOIC).

AFAIK you cannot use 10F @32kHz, and it consumes more power than 12F683:

12F683: NanoWatt:
- 50nA standby
- 11uA @32kHz
- 220uA @4MHz

10F200:
- 100nA standby
- <350uA @4MHz

So I'd say if it's a PDIP package you need then the 12F683 is a bit better
choice.

Tamas



On 5/7/07, Rolf <spam_OUTlearrTakeThisOuTspamrogers.com> wrote:
{Quote hidden}

> -

2007\05\08@181154 by Jinx

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> So I'd say if it's a PDIP package you need then the 12F683 is a bit
> better choice

You can sample PDIP 10F from Microchip. But PDIP kind of defeats
the "smallest micro in the world" thing. You could use it to breadboard,
as samples of SOT23 and DFN are available for PCB installations

I have used the SOT23 10F as a LED flasher, but SOT23 only because
of space restrictions. I would rather have used the 12F629, because of
the lower consumption and better timing features, but have those only in
DIP


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