Re: Rechargeable 3v battery details for microcontroller (Can't lose data!)

From: Kevin (spamisannoying_at_sothisis.fake)
Date: 01/18/05 

Date: Mon, 17 Jan 2005 23:25:32 -0400

On 17 Jan 2005 17:13:15 -0800, "David L. Jones" <altzone@gmail.com>
wrote:

>Even at 10mA or so very intermittent current draw, your batteries will
>last the shelf life.
<snip>
>Primary lithium batteries will give you 10 years life no problems.
>If you use a rechargable solution (which is not needed given the tiny
>current draw) there is the chance that the charger and/or battery will
>fail and you'll be left without a backup. I don't know too many
>rechargable solutions which are good for 10 years service life.
>Recharable is a poor solution for no upside benefit in this case.
>Primary lithium batteries will be much more reliable.

Okay, maybe I'll have to rethink the rechargeable approach then.
Actually what I'll probably end up doing is trying both rechargeable
and non rechargeable versions, but since the circuit is (hopefully)
low power I dunno if I'll see a difference. Thanks for the advice.

Maybe I'll use a standard CR2032 coin cell so when it does come time
to replace it (years down the road) I'll still be able to obtain the
battery ;-) Won't want to run into trouble not being able to buy the
"right" battery and have to kludge something. Hopefully a CR2032 (3V,
220 mAH) should last a long time - I guess I'll just have to test,
optimise, and test again if it doesn't ;-) CR2032 is pretty cheap
(compared to other lithium batteries), so it'll actually reduce costs
if it'll work in this application.

Here's a somewhat related question for anyone: How low power are the
newer "NanoWatt" PIC parts (like the PIC16LF628A) versus something
like TI's MSP430? Doesn't TI claim that the MSP430 is the lowest power
microcontroller (ideal for battery apps)? Just wondering if the
16LF628A is good enough in terms of low power consumption or if I
should investigate other possibilities (Not really willing to jump
ship at this point unless there's a major advantage to be gained, but
I'm curious nonetheless).

Kevin.

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