Slicing open the top of a 48T02 Sun Sparc chip to replace battery is that thing hollow or filled with epoxy?

From: Geoff Reed <geoffr_at_zipcon.net>
Date: Sat May 19 20:27:03 2001

I downloaded the datasheet for the 48t02's, i think i may have a handful of
32.768 xtals here so I'm looking ar chopping the tops off the bad chips I
have and taking protoboard and refitting them with a new xtal and
batteryholder package that can take a replacable lithium cell. :) I
sacrificed one yesterday to the great dremel in the sky to see how the top
was put together...

At 02:48 PM 5/19/01 -0700, you wrote:


>On Fri, 18 May 2001, Richard Erlacher wrote:
>
> > Maybe the SmartSocket isn't what I wanted. Somewhere in the "pit" I've
> got a
> > Dallas socket that has a 3-volt battery in the bottom. It's potted in
> place but
> > provides 3 volts on pin 24, (maybe pin 28, but the upper left corner,
> anyway) in
> > this case and does nothing but provide power to keep the content of the
> resident
> > IC intact, and, maybe, gate the write signal off until the power is
> stabile. I
> > do believe there's no continuity between the write pin on the resident
> IC and
> > the corresponding socket pin, so something's going on. That sort of device
> > might work, don't you think? Next time I'm at the Dallas web site I'll
> try to
> > find the socket and let you know what the appropriate nomeclature is.
> >
> > Dick
>
>There is/was a Dallas SmartClock(?) that contained a battery for the
>internal clock/calendar and also carried a 28-pin socket atop the
>package. I don't believe that battery voltage was provided to the
>socket though. Ampro used them in their LittleBoard/PC.
>
> - don
>
> > ----- Original Message -----
> > From: "Pete Turnbull" <pete_at_dunnington.u-net.com>
> > To: <classiccmp_at_classiccmp.org>
> > Sent: Friday, May 18, 2001 1:43 AM
> > Subject: Re: Slicing open the top of a 48T02 Sun Sparc chip to replace
> battery
> > is that thing hollow or filled with epoxy?
> >
> >
> > > On May 17, 19:34, Richard Erlacher wrote:
> > >
> > > > Has anybody tried one of the DALLAS "smart socket" products with this
> > > thingie?
> > >
> > > Unfortunately the 48T02 is a TOD clock and calendar as well as NVRAM, so
> > > there's no suitable SmartSocket to replace it. The registers have to
> be at
> > > particular places and use a particular protocol too.
> > >
> > >
> > >
> > > --
> > > Pete Peter Turnbull
> > > Network Manager
> > > University of York
> > >
> > >
> >
> >
Received on Sat May 19 2001 - 20:27:03 BST