Re: [701] Battery: What's that chip doing inside there?

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From: Sven Utcke (utcke_at_kogs1.informatik.uni-hamburg.de)
Date: Fri Mar 30 2001 - 05:48:22 EST

Hello Tim,

> Donald MacQueen <dmacq_at_erols.com> asked:
> [...]
> >why do they put counters on batteries? planned obsolescence?
>
> Probably not, but I've never worked with marketing types so
> I can't claim to know how they really operate ;^)

I always assumed it was exactly for this reason, but then, I don't
really know much about marketing either. My reasoning was that
Thinkpads, and in particular the 701, were originally targeted at rich
business-types. Buying a new battery every year probably would be
less of a problem for these then dealing with a slowly decaying one.

> I'm going to take a SWAG (sophisticated, wild-assed guess)
> that the problem Sven sees -- with his battery pack that isn't
> recognized by the 701C -- is due to a damaged DS2324 chip or
> corrupted data in its memory (Assuming the problem is confined
> to that single battery pack).

This is, of course, another option.

> But it always makes sense if it's fun (YMMV). And in Sven's case, if
> the chip wasn't blasted by static and only needs to be reset, then
> it's a bargain.

Iff you figure out how to do it and tell me (and the world :-).

> *** Note to Sven: If you've got a power supply and can monitor the
> DataI/O line with an oscilloscope, it should be relatively easy
> to tell if the chip is still alive. It responds to a "reset
> pulse" with a delayed "presence pulse" of its own. See pp.12-14
> of the DS2434 description at:
> http://www.dalsemi.com/datasheets/pdfs/2434.pdf

I'll try this once I'm back at work (middel of April --- iff I
remeber.

> www.edtn.com/embapps/emba050.htm
> www.edtn.com/embapps/emba056.htm

Thanks for the links

Sven 

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