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PICList Thread
'[PICLIST] [PIC] Lowest power consumption'
2001\11\12@212837 by Eoin Ross

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I am trying to develop a unit which:-
 * Runs on a 9V battery
 * Is turned on by a float switch ... at which point it needs to:-
        Wait 1 second -
                if still turned on ...                     check the battery level                           turn on a piezo buzzer for 10 seconds                                   (pulsing if battery is low)

I only have 16F8XX programming tools (Microchips ICD) availiable
  I know these are overkill but so is forking out heaps of $$ for only needing to program 15 chips.

What is the best oscillator for low low power consumption - I am thinking RC. Obviously timing isn't critical - except for maybe the AD convertor.

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2001\11\13@040559 by Ramana B.V

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Hi,
I am using an F874 to operate at low power. I used an RC at around 250 Khz.
Obviously the lower you go the better. But in your case since it monitors
the ckt every 1 second and does a very minimal
porcessing, most of the time the PIC should be in a stop state. So the
actual frequence may not make much difference.

Ramana B.V

{Original Message removed}

2001\11\13@094739 by t F. Touchton

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RC running as slow as possible.  I've used a 32khz RC oscillator on a C54,
and had about 12uA current draw (WDT off!!).  Timing of course will not be
accurate, and will drift over temp.  With a single transistor temp comp
circuit and the use of 3 "bubbing" caps I was able to hold the frequency to
+/- 2% from -20F to about 100F in a production environment.  I also
operated the C54 at 2V using a Seiko low current regulator (Iq about 2uA).

Hope this gives you an idea of what is achievable.

Scott F. Touchton




                   Eoin Ross
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I am trying to develop a unit which:-

 * Runs on a 9V battery
 * Is turned on by a float switch ... at which point it needs to:-
        Wait 1 second -
                if still turned on ...
                   check the battery level
                         turn on a piezo buzzer for 10 seconds
                                 (pulsing if battery is low)

I only have 16F8XX programming tools (Microchips ICD) availiable
  I know these are overkill but so is forking out heaps of $$ for only
needing to program 15 chips.

What is the best oscillator for low low power consumption - I am thinking
RC. Obviously timing isn't critical - except for maybe the AD convertor.

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2001\11\13@140942 by alice campbell

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Eoin,

Microchip has a good appnote, AN606, that covers low power design, including how to measure power consumption.  A 16f877 will run on a 32kHz crystal, and a crystal is nice for calibrating the watchdog timeout period to adjust the wakeup time if you need pretty good accuracy.  Try to get Microchip's CD with their entire site on it, it will have the appnotes and is not annoying the way their site is.

Alice


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2001\11\16@191951 by Michael Mattson

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Ramana,


  Hello. I came across some information about you on the internet.  I am a
technical recruiter with Allen Scott Associates in Austin, TX.  Our agency
works with a variety of technology companies around the US, from Fortune 500
to Venture Capital Funded Start-ups.
   I am currently conducting a search for an Austin based company that is
looking for a Power Supply Engineer.  Please let me know if you might know of
anyone who would have an interest in hearing about the position listed below.
Thanks for any assistance you may be able to provide.

Power Supply Engineer:

-Developing and qualifiying AC/DC Power Supply designs
-Work with design team to ensure his or her design meets the requirements
for; feature set, functionality, cost, reliability, regulatory compliance,
and industry standards compliance.
-Ability to identify potential product weakness and be able to provide
design guidance and recommendations for improvments to subsequent redesigns
-Excellent knowledge of analog and digital circuit theory and principals.
-Excellent verbal and written communication

Regards,

Michael Mattson
Allen Scott Associates
EraseMEMikeM0069spam_OUTspamTakeThisOuTaol.com

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2001\11\18@012422 by Josh Koffman

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I got one of these a week or so ago...someone is mining.

Josh

Michael Mattson wrote:
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2001\11\18@231422 by Dale Botkin

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I already emailed the individual and let him know that SPAMming list
members was unacceptable and he'd be punted if I got complaints.

Dale
(sole surviving admin)
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curiosity killed the cat, I say only the cat died nobly."
         - Arnold Edinborough


On Sun, 18 Nov 2001, Josh Koffman wrote:

{Quote hidden}

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