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=BA=
C, 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 time, 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 dio=
de.
Low voltage=3Dmuch lower current.

Then when the PIC wakes up it uses two transistors to connect it=B4s supp=
ly 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 n=
edan:
>        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 data
>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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