Searching \ for '[PIC]Power Saving' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/power.htm?key=power
Search entire site for: 'Power Saving'.

Exact match. Not showing close matches.
PICList Thread
'[PIC]Power Saving'
2006\09\27@035945 by genome

picon face
Is power saved in a PIC if input\output pins are defaulted to high 5volts...
I thought I read it on some PIC book I just could not remember so maybe I
ask here..
anyone..



2006\09\27@054409 by Jinx

face picon face

> Is power saved in a PIC if input\output pins are defaulted to
> high 5volts...

genome, Parameter D060 states

Input leakage current (pin at high impedance) is +/- 1uA when
Vss =< Vpin =< Vdd

2006\09\27@074324 by Gerhard Fiedler

picon face
Jinx wrote:

>> Is power saved in a PIC if input\output pins are defaulted to
>> high 5volts...
>
> genome, Parameter D060 states
>
> Input leakage current (pin at high impedance) is +/- 1uA when
> Vss =< Vpin =< Vdd

± 1uA times 14 is ± 14uA...

Could it be that making them outputs results in less current?

Gerhard

2006\09\27@082711 by Jinx

face picon face
> > Input leakage current (pin at high impedance) is +/- 1uA when
> > Vss =< Vpin =< Vdd
>
> ± 1uA times 14 is ± 14uA...
>
> Could it be that making them outputs results in less current?
>
> Gerhard

My bad, I had to rush off to rescue a glue joint and sent the
mail without finishing it

I was going to add that I have a 12F675 running on 2 x AA
(3.3V) with a mix of inputs and outputs

GPIO0 (output) - normally '0'
GPIO1 (output) - normally '0'
GPIO2 (input) - 390k pulldown to 0V
GPIO3 (input) - 100k pullup to Vbatt (Mclr)
GPIO4 (output) - normally '0'
GPIO5 (output) - normally '0'

It uses less than 15nA when SLEEPing, so although the d/s
says "1uA", the true figure is or could be way less than that

You might expect 1000nA from the 100k pullup alone, as
it's capable of passing 33000nA

2006\09\27@175943 by Gerhard Fiedler

picon face
Jinx wrote:

>>> Input leakage current (pin at high impedance) is +/- 1uA when
>>> Vss =< Vpin =< Vdd

> GPIO0 (output) - normally '0'
> GPIO1 (output) - normally '0'
> GPIO2 (input) - 390k pulldown to 0V
> GPIO3 (input) - 100k pullup to Vbatt (Mclr)
> GPIO4 (output) - normally '0'
> GPIO5 (output) - normally '0'
>
> It uses less than 15nA when SLEEPing, so although the d/s
> says "1uA", the true figure is or could be way less than that

Definitely. My question was more about what to do if you want guaranteed
lowest current and have no other requirements for the pin (that's the way I
understood the OP). I guess making it an (unloaded, of course) output is
probably best.

Gerhard

More... (looser matching)
- Last day of these posts
- In 2006 , 2007 only
- Today
- New search...