Why not NAND flash, or is that what you're talking about? The MT boards
don't seem to have too many problems with temperature as far as the
flash goes.
On 5/18/2015 10:35 PM, Forrest Christian (List Account) wrote:
There are solutions, it just comes down to bits per dollar.
A SD card + socket probably costs around $5-6 to implement, including
card. For that you get around 4GB (4096MB) or so. Plus if you're
picky about the brand you can get a card with built-in wear leveling,
etc, so you don't have to worry about that stuff. But you have the
temperature issue.
For the same price, you only get 32MB (0.032GB) of soldered in
memory. Would 32MB be enough? Probably, but there are a *lot* of
things you can do if you have seemingly unlimited storage.
On Mon, May 18, 2015 at 8:33 PM, Vince West <[email protected]
<mailto:[email protected]>> wrote:
Is there no solution for embedded memory instead of a card slot? I
am assuming it is cost prohibitive or it does not work for your
project.
That being said there have been days in the winter where we see
-5° for days in a row. It doesn't happen often. Even with heat
generated from equipment, I am not sure how well it would work or
how long it would last being so close to the limit for extended
periods of time.
On May 18, 2015 10:23 PM, "Jeremy" <[email protected]
<mailto:[email protected]>> wrote:
The coldest that I saw INSIDE our enclosures this year
(accordint to SiteMonitor internal temperature) was 0-C
(32-F). Last year was much colder but back then I was using
the APC for temperature and backup, and that graph data has
all been deleted. I can't say for sure if the temperature in
the box was lower, but I doubt it would go too far below 32
with all the equipment and batteries in the boxes.
On Mon, May 18, 2015 at 8:14 PM, Adam Moffett
<[email protected] <mailto:[email protected]>> wrote:
Wouldn't the simple answer be to offer the device and SD
card as separate items? Then on your site you say, "If
you want to have storage with the same industrial
temperature range as the rest of my product line then buy
this card, or supply your own at your own risk."
Everybody selling fiber to the radio with an SFP slot does
it that way. I always buy their SFP module.
On 5/18/2015 10:09 PM, Forrest Christian (List Account) wrote:
What is the lowest temperature that each of you would
normally expect to see in your enclosures?
The reason I'm asking is that I'm in the process of
developing up a few new products.
To date, all of the packetflux products are designed with
components rated -40 to +85C (I.E way cold to way
hot). I'd like to retain this rating, but I'm running
into a minor snag:
For storage, I'm planning on integrating a SD card
(probably microSD) in a socket. I only need a GB or so,
and SD card memory is inexpensive at that range.
Unfortunately, all the reasonably priced SD cards are
only rated down to about -25C or -13F. which are about
~$3 in qty. "Industrial temperature range" ones which
are good down to -40C/F are available but they add at
least $30 to the cost for non-name brand, and even more
for known brands. When you're talking about a $100
end-user price, a $30 1GB SD card seems excessive - and
probably isn't even possible if I want to meet the $100
price with some margin.
So, I'm currently playing the 'what options do I have'
game. I hate to ship a product only rated down to
-25C/-13F, but I know for at least a large chunk of my
customer base they never see below this temperature,
especially when you add a watt of power dissipation in
the case with the device. Which leads me back to my
original question: What's the lowest temperature most
people would expect to see inside their enclosures.
--
*Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
Tel: 406-449-3345 | Address: 3577 Countryside Road,
Helena, MT 59602
[email protected] <mailto:[email protected]> |
http://www.packetflux.com <http://www.packetflux.com/>
<http://www.linkedin.com/in/fwchristian>
<http://facebook.com/packetflux>
<http://twitter.com/@packetflux>
--
*Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
[email protected] <mailto:[email protected]> |
http://www.packetflux.com <http://www.packetflux.com/>
<http://www.linkedin.com/in/fwchristian>
<http://facebook.com/packetflux> <http://twitter.com/@packetflux>
