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'12c50x - Change in Oscillator Spec?'
1998\07\21@234242 by Mark A Winters

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I just received some 12c508 parts from Digi-Key, and included with the
shipment is a memo titled "IMPORTANT NOTICE!!!" The memo appears to be from
Microchip, and is dated July 1998.

In part, this memo states that ..."The current data sheet has changed and
Microchip FAEs have the new specifications. IT IS NOT RECOMMENDED TO USE THE
INTERNAL RC OSCILLATOR FOR TIME CRITICAL APPLICATIONS!"

Does anyone know if this represents a change in the actual manufacturing (or
chip acceptance) process, or are they simply re-emphasizing "known"
information?

I downloaded the new datasheet and looked at section 11. (This contains the
charts showing the internal RC frequency range vs. temperature and
calibration values.) The charts appear to be identical to the previous
version of the datasheet, so this memo has me a bit confused.

Anyone know what's going on?

Thanks,
Mark

1998\07\21@235252 by Jim Robertson

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At 21:34 21/07/98 -0600, you wrote:
{Quote hidden}

Mark,

Have a look at http://www.dontronics.com There is an important message
there regarding the Sony playstation mod and the 12C508 oscillator problem.
This will explain the situation.

Jim
--------------------------------------------------------
Jim Robertson
NEWFOUND ELECTRONICS
Email: spam_OUTnewfoundTakeThisOuTspampipeline.com.au
http://www.pipeline.com.au/users/newfound
--------------------------------------------------------

1998\07\22@113932 by Mauro, Chuck

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I suspect it might be a form of CYA or liability limitation bulletin, and
doubt that it represents any real changes.  However I could be wrong (sigh),
so call your FAE for real data, like they indicate...

I use the '508/9 in the internal OSC mode, and have had no problems with
them...

Ciao,

Chuck
----------------------------------------------------------------------------
----------------------------------
C.S. Mauro, Jr.
Amateur Radio Callsign: KD7BWP

"I tell you, we are here on earth to fart around, and don't let anybody tell
you any different."

Kurt Vonnegut



> {Original Message removed}

1998\07\22@114332 by Mauro, Chuck

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Thanks, Jim.

Great - I was wrong in my earlier reply to Mark.  Well, I said I could be,
so there you have it.

Too anxious to help, without bothering to read the whole thread first...

Sorry for the wasted bandwidth.

Ciao,

Chuck

> {Original Message removed}

1998\07\22@125447 by Peter L. Peres

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On Tue, 21 Jul 1998, Mark A Winters wrote:

- snip -
> In part, this memo states that ..."The current data sheet has changed and
> Microchip FAEs have the new specifications. IT IS NOT RECOMMENDED TO USE THE
> INTERNAL RC OSCILLATOR FOR TIME CRITICAL APPLICATIONS!"
- snip -

A product that is assumed to be accurate in timing in some way, and is
not, can mandate a lawsuit against its maker by some damaged party. Same
for 'life-critical' equipment etc. F.Ex. National have a notice in each
and every catalog on this (not for use in life-critical equipment). If
someone expires because a chip did not open a valve on life support
equipment exactly when it should have, everyone involved in the design of
that equipment is in hot water, excepting those who provided the notice
mentioned above, who will run scot free ;).

Peter

PS: Warning: I'm not a lawyer.

1998\07\22@141645 by Mark Winters

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Thanks for the pointer, Jim.

In following a link on the web page you refer to, I found an
"experimental" code fix at http://www.aeug.org/~chip/src/m508v54f.zip
This code simply adds 0x10 to the factory-programmed OSCCAL value.
They appear to have had good success with this "fix" when used with
the batch of chips in question.

Interesting...

Thanks again,
Mark


>>> Jim Robertson <.....newfoundKILLspamspam@spam@PIPELINE.COM.AU> 07/21/98 9:58 PM >>>
At 21:34 21/07/98 -0600, you wrote:
>I just received some 12c508 parts from Digi-Key, and included with
the
>shipment is a memo titled "IMPORTANT NOTICE!!!" The memo appears to
be from
>Microchip, and is dated July 1998.
>
>In part, this memo states that ..."The current data sheet has
changed and
>Microchip FAEs have the new specifications. IT IS NOT RECOMMENDED TO
USE THE
>INTERNAL RC OSCILLATOR FOR TIME CRITICAL APPLICATIONS!"
>
>Does anyone know if this represents a change in the actual
manufacturing (or
>chip acceptance) process, or are they simply re-emphasizing "known"
>information?
>
>I downloaded the new datasheet and looked at section 11. (This
contains the
>charts showing the internal RC frequency range vs. temperature and
>calibration values.) The charts appear to be identical to the
previous
>version of the datasheet, so this memo has me a bit confused.
>
>Anyone know what's going on?
>
>Thanks,
>Mark


Mark,

Have a look at http://www.dontronics.com There is an important
message
there regarding the Sony playstation mod and the 12C508 oscillator
problem.
This will explain the situation.

Jim
--------------------------------------------------------
Jim Robertson
NEWFOUND ELECTRONICS
Email: newfoundspamKILLspampipeline.com.au
http://www.pipeline.com.au/users/newfound
--------------------------------------------------------

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