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NNTP-Posting-Date: Thu, 02 May 2024 22:56:02 +0000
From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Declining datasheet quality
Date: Thu, 02 May 2024 15:56:02 -0700
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On Thu, 02 May 2024 11:59:38 -0700, john larkin <jl@650pot.com> wrote:

>On Tue, 30 Apr 2024 18:20:53 -0700, John Larkin
><jjSNIPlarkin@highNONOlandtechnology.com> wrote:
>
>>On Tue, 30 Apr 2024 17:53:18 -0700, Don Y
>><blockedofcourse@foo.invalid> wrote:
>>
>>>A colleague teaching a STEM course asked me for some details on WS2812's.
>>>Digging through the datasheets I've been able to find seems like they
>>>are sold only to hobbyists -- or, at least not to folks who have to
>>>*design* with them!
>>>
>>>I can't seem to find any specification of Icc -- at MAX (255.255.255)
>>>intensity and "dark" (0.0.0).
>>>
>>>Nor anything giving thermal characteristics of the package beyond
>>>ambient (70C) and max junction temperature (80C) -- I suspect it
>>>wouldn't be hard to melt the things if they dissipate any
>>>appreciable amount of power!
>>>
>>>Is this the "typ" trend taken to its logical extreme (where we
>>>don't really care how it MIGHT work in a given environment, beyond
>>>"try it and see"?)
>>
>>Data sheets are increasingly awful. Some don't even say what the part
>>does. Some mechanical drawings have missing dims. And where is pin 1?
>>
>>People randomly distribute abs max, pin function tables, equivalent
>>schematics, electrical characteristics, whatever. Often there is no
>>date or version number. File names are bizarre, unrelated to the part
>>number.
>>
>>I especially hate a data sheet that covers a bunch of parts and
>>doesn't tell you what the difference is between them.
>>
>>Or covers a zillion parts and makes me build the part number, and then
>>guess whether it's an available thing.
>>
>>This isn't really bad:
>>
>>https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://cdn-shop.adafruit.com/datasheets/WS2812.pdf&ved=2ahUKEwi9sYqdpOuFAxV6IDQIHX-dCJ0QFnoECB0QAQ&usg=AOvVaw2wZFi_i6GR7eWbT12yqVZd
>
>Here's a good (ie, bad) data sheet example.
>
>https://www.rohm.com/datasheet?p=SH8JC5&dist=Digi-key&media=referral&source=digi-key.com&campaign=Digi-key
>
>It's not clear when they are talking about one die or two. The word
>"and" is not helpful.
>
>It's not clear if this is one or two die, which can matter. I'll x-ray
>one.

https://www.dropbox.com/scl/fi/eahb9v65w2d13isrbsw5a/208-1006.jpg?rlkey=ist02aewzmdz9rjly97ie4ry4&raw=1