Re: Datasheets for Intersil LD110C and LD111C?

From: Kevin Carney (carneyke_at_us.ibm.combo)
Date: 06/30/04 

Date: Wed, 30 Jun 2004 08:44:13 -0400

Sam,
I have a schematic of a Simpson 464 DVM. It uses that chipset. Send me your
FAX number and I'll get you a copy of the schematic. 

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-- 
change .combo to .com for correct email
***************************************************
"We ought always to know precisely why a given job
is done in a particular way, and why it is done at
all, and why it can't be done more efficiently,
if it must be done at all."-- T.J.Watson
***************************************************
"Sam Goldwasser" <sam@saul.cis.upenn.edu> wrote in message
news:6w3c4e32q5.fsf@saul.cis.upenn.edu...
> These were apparently common ICs with multiple sources for 3-1/2 digit
panel
> meters maybe 25 years ago.  Google doesn't seem to turn up any useful
info,
> just a few places to buy them.  I'm looking for datasheets or any other
info,
> or even a schematic of a sample meter that uses them.
>
> I have an autoranging DPM that works fine except that it goes nuts
> with readings between 6.00 and 7.99 V as well as 16.00 and 17.99 V, but
only
> if the last digit is a "9", at which point it wants to change to the
> lower range.  Then, it does that, realizes its mistake, and ends up
> in an infinite loop of sorts.  Seems like a couple bits are stuck
> somewhere but I would like to know if this is inside one of these
> ICs or external.
>
> The autoranging is also a bit strage, though it may be normal: Going up,
> it changes ranges when the highest displayable reading is exceeded.
> For example, 1.999 rolls over to  2.00.  But, going down, it waits until
> the reading drops below 1.00 (for this example) rather than 1.999.
>
> Not anything on which the future of the Universe depends, just curious.
>
> Thanks.
>
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