AVR-Chat

Just wanted to add to this.  In this day and age, most if not almost all
switching regulators will win out over linear types.

One exception is the LDO linear regulator but then you need to have your
input voltage to be very close to your output voltage for there to be
any real efficiency.

I've done extensive research on DC-DC converters, mostly converting from
3.6 volts to 5 volts.  The parts I'm using are 96% efficient.

Some amazing stuff out there.

Barry


-----Original Message-----
From: David VanHorn [mailto:dvanhorn@cedar.net] 
Sent: Monday, April 05, 2004 7:17 AM
Subject: Re: [AVR-Chat] sleep mode in mega16

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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