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PICList Thread
'PIC from 9V battery'
1998\10\30@093757 by scott.list

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Greetings:

I bet this has been covered numerous times before, please excuse the
repititious question if so:

I have a small project where I'd like to incorporate a 16F84 but I need
to power it via a 9v battery.  I'd like to keep the project as
small/light as possible and would like advise on the best way to power
the PIC.

Can someone recommend a specific V-reg (other than the 7805 I've been
using) or perhaps something smaller I can accomplish this with?  Could I
do it with some sort of zener arrangement? Obviously I'm no electroics
wiz :-( .

The PIC will only be monitoring one High/Low input and will be switching
one 2N2222 transistor as output. (I know the '84 is overkill, but it's
what I know how to use).

Thanks in advance for any help.
Scott

1998\10\30@110513 by Peter L. Peres

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On Fri, 30 Oct 1998, Scott Horton wrote:

> The PIC will only be monitoring one High/Low input and will be switching
> one 2N2222 transistor as output. (I know the '84 is overkill, but it's
> what I know how to use).

I suppose that a 4V2 0.3Watt zener in series with the power supply will
get you there. If the zener is not a good quality one you will also need a
resistor of about 10 kOhms between Vdd and Gnd of the PIC to drain the
leakage.

Peter

1998\10\30@170607 by Lynx {Glenn Jones}

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Use a 78L05, only the size of a TO-92 package, so quite small.

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On Fri, 30 Oct 1998, Scott Horton wrote:

{Quote hidden}

1998\10\30@174934 by Craig Lee

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Or an SOIC.  As wide and as high as head of a thumbtack.

Craig

>Use a 78L05, only the size of a TO-92 package, so quite small.

1998\10\30@182243 by Bob Blick

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>
> >Use a 78L05, only the size of a TO-92 package, so quite small.
>
It sounds to me like there must be a lot of Eveready or Duracell
stockholders on this list. A 9v battery will be dead in a couple of days
just powering a 78anything05 regulator.

How about the LM2936-5.0 ? It draws less than the PIC it will power. Or
anything in the TK112 or TK114 line from Toko.

Cheers,
Bob

1998\10\30@185233 by William Chops Westfield

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Switching regulator providers are quick to point out that the current
drain of a simple linear regulator used to provide 5V from a 9V battery
is quite high (compared to typical PIC circuits.)  You can increase your
battery life significantly by going to some sort of swicthing regulator
design (unfortunately increasing your costs and complexity at the same time.)
You can increase it even more by replacing the 9V battery with 2AA cells and
converting to a "boost" switcher configuration - apparently 2AA cells has
considerably more raw power than a 9V battery.  (also, for small current
drain, you can go to a capacitor-only based voltage converter...)

BillW


'PIC from 9V battery'
1998\11\02@121246 by John Payson
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|Switching regulator providers are quick to point out that the current
|drain of a simple linear regulator used to provide 5V from a 9V battery
|is quite high (compared to typical PIC circuits.)  You can increase your
|battery life significantly by going to some sort of swicthing regulator
|design (unfortunately increasing your costs and complexity at the same time.)
|You can increase it even more by replacing the 9V battery with 2AA cells and
|converting to a "boost" switcher configuration - apparently 2AA cells has
|considerably more raw power than a 9V battery.  (also, for small current
|drain, you can go to a capacitor-only based voltage converter...)

Another advantage of the two AA's driving a switcher is that a
boost switcher can operate in "pass-through" mode with zero
quiescent current draw.  If your device only needs the full 5v
when it's really "operating", being able to throttle down to
raw battery may help considerably with current consumption.



Attachment converted: wonderland:WINMAIL.DAT (????/----) (0001C117)

1998\11\02@131722 by Sean Breheny

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Oh oh, John, the attachments from hell are back <G>!

>Attachment Converted: "c:\bawin\winba\eudora\attach\WINMAIL10.DAT"
>

Sean

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| Electrical Engineering Student|
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1998\11\02@133419 by goflo

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"Simplified Design of Micropower & Battery Circuits",
by John D. Lenk, contains useful discussion and examples...

Jack

John Payson wrote:
{Quote hidden}

1998\11\02@142555 by Dwayne Reid

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Oh, NO!  Its back!  ;)

<big snip>
>
>begin 600 WINMAIL.DAT
>

dwayne


Dwayne Reid   <.....dwaynerKILLspamspam@spam@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(403) 489-3199 voice     (403) 487-6397 fax

1998\11\03@023136 by schmaeche

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Dear Scott Horton,

just have a look at the new High Voltage PICmicro PIC16HV540. It
includes a voltage regulator and should work from 3.5V ... 15V.

Hope this helps!
Best regards / Saludos

Marc Schmaeche

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{Quote hidden}

1998\11\05@070558 by schmaeche

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Dear Scott,
>
> Marc:
>
> I couldnt' find any info on Microchips website about that chip.  Do you know
> what family it's in?  Do you have a .pdf datasheet you could send?  I didn't
> see it in Digikey's latest catalog, either.
>
> Thanks,
> Scott

I just saw a note on an info sheet of Metronik (a German distributor)
about the PIC16HV540.

Here some more details:
- Software- & pinkompatible to PIC16C54, but 4 stack-levels
- EPROM 512*12Bit, RAM 25 Bytes
- 8 High Voltage IO Pins on Port B, 4 Low Voltage Pins
- includes a voltage regulator (should work from 3.5V ... 15V)
- Wake-up from Sleep through Sleep-Timer or Change on Pin

Maybe anybody else knows more about it ...

Best regards / Saludos
Marc Schmaeche

-----------------------------------------------------------------------
        DESCON Informationssysteme GmbH

 Dipl.-Ing. M.Schmaeche     Tel.:   +49 (0)9131 691145
 Abt. Elektroniksysteme     Fax:    +49 (0)9131 691166
 Am Weichselgarten 7        E-Mail: .....schmaecheKILLspamspam.....descon.de
 91058 Erlangen, Germany            (German/English/Spanish welcome)
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1998\11\05@102542 by Matt Bonner

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M.Schmaeche wrote:
{Quote hidden}

I also couldn't find anything on MChip's web site (even though my
samples were on the way).  My MChip distributor brought the data sheet
along with the 2 samples.

The datasheet is 36 pages long, so I can't scan/email it in its
entirety, but if anyone has any specific questions.....

--Matt

1998\11\20@081701 by Matt Bonner

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M.Schmaeche wrote:
{Quote hidden}

I also couldn't find anything on MChip's web site (even though my
samples were on the way).  My MChip distributor brought the data sheet
along with the 2 samples.

The datasheet is 36 pages long, so I can't scan/email it in its
entirety, but if anyone has any specific questions.....

--Matt

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