17 May
2001
17 May
'01
1:34 p.m.
That's a different device than what I thought it was. There are some
interesting little MCU's that have a ceramic package and a plastic potted cap
over the top, containing, among other things, a battery. That's what I believed
you guys were fiddling with.
Has anybody tried one of the DALLAS "smart socket" products with this thingie?
It would seem to me that the smart socket (if that's the one with the battery in
the bottom, would be just the thing to "fix" this sort of battery aging problem
without surgery. Similarly, if one were to pot a couple of batteries into the
bottom of a socket and put a schottky diode between the battery output and the
Vcc pin, it should work fine when Vcc isn't there to keep the IC powered up. It
seems to me that the DALLAS device manages the nWR signal as well, so funny
things don't happen during power-transients.
Dick
----- Original Message -----
From: "Doug Carman" <pdp11(a)bellsouth.net>
To: <classiccmp(a)classiccmp.org>
Sent: Thursday, May 17, 2001 4:52 PM
Subject: Re: Slicing open the top of a 48T02 Sun Sparc chip to replace battery
is that thing hollow or filled with epoxy?
John Honniball wrote:
That's the method I used, just exposing part of the wiring
from battery to chip. It's not deeply buried, and the FAQ
gives the location at the end opposite to Pin 1. I didn't
even disconnect the old battery, but simply paralleled my
own AA battery holder and fitted two AA batteries.
I have used the same method, but used a button style battery and a
holder that I bought at Radio Shack.
--
Doug Carman
pdp11(a)bellsouth.net