Hello,

Definitely use sleep mode.  If you have T1 available (I don't have the 16F627 specs in front of me and am more fimiliar with 16F87x) you can use the low power osc to wake up on T1.  Make sure you have no floating unused inputs.  Avoid WDT as it is a power hog (at least with some PICs).  Even if you wake up every second to maintain a RTC you can achieve low power.

David

On Thu, 20 Jun 2002 23:54:46 -0300
Gabriel Caffese <gabrielsdi@IMPSAT1.COM.AR> wrote:

> Hello everyone,
>
>         I have a project where I have to take GREAT care of battery life.
>         It4s a portable system with a 16F627, that has to make some measurements
> every
>          300 seconds, and stay on for 20 seconds.
>         Once the system is turned on, it will NEVER be turned off.
>         So, system4s life depends on batteries life. When batteries die, the whole
> system is disposed.
>         For the batteries I have to use, putting the 16F627 in sleep mode wouldn4t
> be a solution, cause I
>           would be far away from where I should (in terms of battery life).
>
>         Now, the question:
>
>         I thought of using a DS1337 RTC, wich has an alarm output that could be
> configured to
>          power the PIC every 60 seconds.
>         I4ve also thought of use a 4060 counter, and others in cascade, but.......
>
>         Would there be a better solution (cheaper, easier) for powering the 16F627
> ?
>
>
>         Thanks in advance,
>
>                         Gabriel.-
>
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