AVR-Chat

The mega16 in max power mode consumes only 40ma.  Simply putting it into
IDLE mode between interrupts will drop the consumption to 5 or so ma.  If
you circuit is drawing 250ma then the vast bulk of the current draw is from
something OTHER than the CPU.

Read about the sleep modes in the data sheet.  You set two bits in the MCUCR
and then execute the "sleep" instruction.  Interrupts will bring you out of
the sleep.  Turning off peripherals (Analog comparator, ADC) will save you
about 1ma max, if even that.


-----Original Message-----
From: jay marante [mailto:jaythesis@yahoo.com]
Sent: Monday, April 05, 2004 7:38 AM
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] sleep mode in mega16


im using max883 as a linear regulator. its output is about 200-250mA of
current.

how will i code the power-save mode in ICCAVR?

thanks.

-jay

David VanHorn <dvanhorn@cedar.net> wrote:
  At 06:56 AM 4/5/2004 -0700, jay marante wrote:

  >Hi!
  >
  >I want to put the mega16 in a power-save mode but i cant get it done. anu
sample C codes? i want it so badly coz my system comsumes so much power from
the 9V battery. i think it wont even last a day.


  First off, how are you doing your voltage regulation?
  When moderate currents are flowing, switchers are more efficient.
  When the current is very small, linear regs win.


  On sleeping, you need to set your external I/O up to the appropriate
states (only you can figure that) and then worry about the processor.

  Turning off timers that you don't need, shutting down analog ref and A/D.
In the M128, you can program the Xdiv register to slow the clock down quite
a lot.  In all the megas, you can program the CKOPT fuse to use the Vittoz
oscillator, but you'd better do some careful design there, to avoid
problems.

  Of course you need a mechanism to come out of low power mode, like an
interrupt, or ... ?




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