Gerhard Fiedler wrote:
> Rolf wrote:
>
>   =

>> Olin Lathrop wrote:
>>     =

>>> Rolf wrote:
>>>   =

>>>       =

>>>> temp range from -40 to +40
>>>>         =

>>> Make sure to use E parts then.
>>>       =

>> Why?
>>     =

>
> Because other parts are not speced for operation down to -40=B0C (and the=
ir
> parameters may be still further off that you expect them to be)? Look at
> the headers of the parameter spec tables; they state the temp range there
> (among other conditions).
>
> Gerhard
>
>   =

Hi Gerhard

Yes, exactly. Table 12.1 especially parameter D001B which is what I =

based the purchasing decision on...

Gerhard, you seem to agree with Olin on this, yet, you both appear to =

contradict the exact tables you are now referring me to.... I get the =

impression though that you are just assuming that Olin is right, and you =

are trying to make me see the obvious. Yet, I believe Olin is wrong, and =

you are just following his lead....

The Industrial part is spec'd from -40 to +85 (and A/D is spec'd to work =

at -40 with minimum 2.5V). The Extended is spec'd from -40 to +125 =

(ditto for A/D).

Olin is the 'guru', so, I figure when he disagrees with the datasheet it =

must be because:
1. I have misread something, or simply not seen it.
2. Olin's vast experience in some way 'trumps' the datasheet.
3. Olin did not RTFM, but, well, Olin claims to have only been wrong =

once.... (actually, only 1 in 1000 ;-) so it could not possibly be that...

Actually, my original post seemed like a reasonable one at the time. =

Sure, I missed a whole graph in the Datasheet, but, I had searched for =

WDT and SLEEP through the datasheet and missed that. It happens (whether =

Olin believes it or not). Still, as murphy so often does, I found the =

reference soon after sending my mail. I posted two seperate mails =

indicating that Olin should not bother replying, and then another with =

the full answer to my original question. Then, Olin still replies and =

'lambasts' me. I will give him the benefit of the doubt and suggest that =

he did not read the other mails I sent (or they did not get to him in =

time), but, he then makes recommendations that do not match my =

understanding, so I ask why?

I was very prompt to acknowledge my oversight. Still, when Olin makes a =

direct comment like "Make sure to use an E part", and that is =

contradictory to my understanding, I would like to know why...

But, no answer yet from the great Olin. I see that he has answered lots =

of other things so I can only assume one of a few things....

1. he has not seen my question (though I would doubt that)
2. he is wrong, but does not want to admit it
3. he has some knowledge that I do not have yet, but he does not want to =

share.
4. he considers me to be a waste of time, and that I am too lazy to see =

the 'obvious' answer.

Contrary to Olin's assumptions, not everyone who asks questions is =

totally ignorant. I spent a lot of time pouring over the datasheet =

before I posed my question (even though I missed the graph - I was =

really expecting there to be some formula, or parameter, not a graph). I =

also spent a lot of time deciding which PIC (and which version) to use =

and paid careful attention to the temp specifications.

It frustrates me when Olin insinuates my incompetence when I feel it is =

unwarranted, and it frustrates me more when he refuses to answer things ...

So, for now I can only assume that there is something I am missing, but, =

what?

Rolf

-- =

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