kravnus wolf wrote :

> My experience with PIC sleep has been quite
> interesting. When I executed the sleep instruction,
> the system was still draining about 0.40mA. At times
> it would take up more......
> After reading the article on the PICLIST, I found that
> the output pins MUST not float or it would drain
> power.

Are you talking about pins configured as *inputs* ?
If so, they should never float, sleeping or not.

> After setting all pins as output and latch them to
> low. The power consumption is well below. 0.00mA(from
> my fluke).

Setting them to high would probably work just as well.
The important thing is that they are set as outputs (or
tied high or low externaly using 100K-1M ohm.

> Just sharing my experience.

That's fine of course.
It's just that it's fairy common knowledge.
You should never leave a CMOS input floating,
doesn't matter if it's a PIC or any other CMOS
device. They are very high impedance inputs
and will pick up any electrical fields fom "the air"
like an antenna, such as 50/60 Hz mains interference.

I just checked a couple of data sheets (628A and 877A)
and there are recomendations about this issue.

Jan-Erik.



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