AVR-Chat

If you really are pulling 250 mA with a simple design and a linear 
Vreg, make sure you have a 0.1uF bypass cap between the V input and 
ground as called out on the datasheet.  Its easy enough to overlook 
when putting something together.  
 
At 250mA your vreg should be very hot or have a mondo heatsink.  

--- In AVR-Chat@yahoogroups.com, "Larry Barello" <yahoo@b...> wrote:
> 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@y...]
> 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@c...> 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 ... ?
> 
> 
> 
> 
> --------------------------------------------------------------------
--------
> ----
> Do you Yahoo!?
> Yahoo! Small Business $15K Web Design Giveaway - Enter today
> 
> --------------------------------------------------------------------
--------
> ----
> Yahoo! Groups Links
> 
>   a.. To visit your group on the web, go to:
>   http://groups.yahoo.com/group/AVR-Chat/
> 
>   b.. To unsubscribe from this group, send an email to:
>   AVR-Chat-unsubscribe@yahoogroups.com
> 
>   c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
Service.