Datasheets for Intersil LD110C and LD111C?

[Sam Goldwasser]

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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[Piotr Piatek]

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.

http://www.pisi.com.pl/piotr433/ld110-111.zip

5 pages, 441kB

 

[Kevin Carney]

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.
--
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

***************************************************


--
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

***************************************************