Robert,

Please, what are BOD and LVD's? I am doing a low power design myself so
  I need all the help I can get.

"DO NOT USE BOD! It's 300uA of wasted power where external LVD's draw 10uA."

Looking forward,
Al Shinn

************************************************************************
Date:    Sun, 18 Jan 2004 11:36:47 -0700
From:    Robert Rolf <Robert.Rolf@UALBERTA.CA>
Subject: Re: [OT]: Low Power System Design


#LEE CHUN YONG# wrote:

 >
 > Currently I am designing a data acqusition system. I would like to
know what are some of the techiques that I should adopt so that the
system is consuming little energy. Thank you in advance.


In no particular order:
Run on as low a supply voltage as possible (1.8V instead of 3.3V or 5V).
Use switch mode regulators and/or micropower regulators.
Have battery supply voltage close to system supply V. May be able to
avoid regulator entirely
(use switched, dedicated reference for A/D).
Use a variable output regulator if you only need higher voltage with small
duty cycles and if power load warrants cost.
Use as slow a clock rate as possible. Use two frequency clocks if
applicable.
Sleep as much as possible.
Turn off unused peripherals as much a possible. This includes I/O (RS232
particularly).
Always sleep with pins NOT fighting pullup/pulldown.
DO NOT USE BOD! It's 300uA of wasted power where external LVD's draw 10uA.

Make sure unused inputs are properly terminated (not floating).
Conformal coat board to reduce leakage currents.
Use only as much micro as you need. Unused memory/peripherals cost
power, but don't
undersize so growth/improvement possible.


Others I've missed?
Robert
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