If you need to safe power look at the MSP430 MCU from TI.

Regards.
Eelco.

----- Original Message -----
From: "M. Adam Davis" <adampic@UBASICS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, June 21, 2002 10:58 PM
Subject: Re: [PIC]: Turning on a PIC micro every 5 minutes.....


Not simpler and cheaper, but less power hungry.  I liked the idea of
using an RTC with alarm switching a FET or similar to power the PIC.
 The RTC can either have its own battery (internal, lasts several years)
or connection to the regular batteries and draw very little power.

But there again (as was previously mentioned) your real drain, the on
time of the micro, is what you should really be concerned about...

-Adam

Gabriel Caffese wrote:

>Hi again,
>
>        I=B4ll give you more information about the project:
>
>        1) The whole system will be a 0=BAC for 4 days, and then 4 days =
at
25=BAC, and
>again....
>        2) I NEED to wake up the PIC, at exacly 300 seconds.
>        3) The system will store in an external EEPROM, the date and tim=
e,
every
>time
>the user pulses a switch.
>
>        So:
>        (a) I understand I have to use Timer1 with a 32,768khz cristal.
>        (b) I=B4ve succeeded in lowering the consumption up to 10ua.
>
>        Is (a) the best solution ??????
>        Do you know about another one, simpler, and cheaper ?
>
>        Thanks again,
>
>                                Gabriel.-
>
>-----Mensaje original-----
>De: pic microcontroller discussion list
>[mailto:PICLIST@MITVMA.MIT.EDU]En nombre de Morgan Olsson
>Enviado el: Viernes, 21 de Junio de 2002 06:51
>Para: PICLIST@MITVMA.MIT.EDU
>Asunto: Re: [PIC]: Turning on a PIC micro every 5 minutes.....
>
>
>In sleep, power the PIC by voltage from the lower cell only trrough a
diode.
>Low voltage=3Dmuch lower current.
>
>Then when the PIC wakes up it uses two transistors to connect it=B4s sup=
ply
to
>the top cell plus.
>
>If you can arrange to run on the 32kHz xtal all times except the rare
>occasion every month that would help much!
>
>/Morgan
>
>Hej Gabriel Caffese. Tack f=F6r ditt meddelande 04:43 2002-06-21 enligt
nedan:
>
>
>>       But I forgot to say, that the system will use 2 button cell
>>
>>
>(lithium)
>
>
>>batteries in parallel,
>>so Vdd is 6volt, and will use a 4mhz Xtal, cause it has to download dat=
a
>>every 1 month.
>>       Another thing, is that I have never been able to get a lower
>>
>>
>consumption
>
>
>>that 0.08 ma @5v,
>>in sleep mode !!!
>>       So, what can I do ?
>>
>>
>
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>
>
>
>
>

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