|Re: AAA batteries on WP34S - a fantasy|
Message #27 Posted by Andrés C. Rodríguez (Argentina) on 7 Jan 2012, 9:29 a.m.,
in response to message #26 by uhmgawa
I assume SoC means "system on a chip", please confirm.
I think that the CR2032s should always be kept installed, so to maintain the non-volatile RAM contents. The steering-diodes (or, better, your switch, or the "ideal diodes" suggested in a previous post) should help avoiding the drainage of the coin cells while running programs.
If a small, switching power supply is to be used, it may be important to knnow the power status of the system, in order to turn off such power supply when appropriate (CR2032s will then supply the standby power). If plain AAA (or AAAA) cells are series connected without a switching power supply, there is a chance that, if their voltage drops below a certain level, the steering circuit will put them off-line, and the CR2032s will unexpectedly be at the front line again.
In any case, the "low battery" condition acquires many new meanings, and more analysis is due to avoid undetected situations which may end in data losses. And backing everything to flash all the time is limited by the maximum number of reliable write cycles available.
Please disregard any idiomatic mistake.