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cgracey
02-06-2007, 08:16 AM
Kloss said...
Interesting that someone is brave enough to use a propeller chip in a
professional application.
This chip doesn't even have a datasheet, and it is very likely that
it has never been tested against any of the usual standards for integrated
circuits.
I would not even think about using it for anything other than hobby
projects.

DATASHEET NOW AVAILABLE (30 March 2007):

http://forums.parallax.com/showthread.php?p=641840 (http://forums.parallax.com/showthread.php?p=641840)


Kloss,

I understand what you're saying, and I'd have the same worries, myself.

In this case, though, I know that the Propeller is solid because I designed, debugged,·tuned, and tested·it myself. The only other person involved in the silicon·design was·one other layout engineer. This took eight years of my time, and two years of the layout engineer's time. An excruciating amount of attention went into every aspect of the Propeller's design and testing, and I allowed no compromises.

As for industry-standard tests, we recently hired a company called Nano Measurements·to perform their own environmental and ESD testing on the Propeller. Specifically, the following tests were conducted:

PPOT - Pressure pot, autoclave: 121șC, 100% RH, 15 PSIG, 336 hours
TMCL·- Tempurature cycle, air, standard ramp: -65șC to 150șC, 500 cycles
PREC - Preconditioning (simulates soldering process): 30șC, 60% RH, 192 hours
HTSL - High tempurature storage life: 150șC, 1000 hours
ESD HBM - ESD human body model: All pins tested up to +/-8kV

Here are the results:

PPOT - 3 lots of 77 devices (PDIP, LQFP, QFN): 0 failures·(a lot of 77 ensures 3-sigma-quality with one failure)
TMCL - 2 lots of 77 devices and·1 lot of 76: 0 failures
PREC - 3 lots of 77 devices: 0 failures
HTSL - 1 lot of 230 devices (near-even mix of PDIP, LQFP, QFN): 0 failures
ESD HBM - 3 devices each of PDIP, LQFP, QFN:·all I/O pins survived +/-8kV (limit of tester) with VSS and VDD grounded, VSS-to-VDD·zap failed at·+/-3kV or greater

So, no environmental failures, and no testable ESD failures on I/O pins, but with the power supply pins failing at +/-3kV or greater·(which is quite acceptable). All these environmental tests say almost nothing about the quality of the chip, but only that the plastic packaging was good. The ESD tests start to give some metric of the silicon quality, but say nothing of what is far more likely to be a problem - design quality. There are no universal metrics for this, and it can only be understood by actually applying the device. This is the critical life test!

Here's why the Propeller is·high-quality:

The Propeller was an entirely full-custom effort. Every polygon of·the Propeller's·mask artwork was made here at Parallax - we designed our own logic, RAMs, ROMs, PLLs, bandgap references, oscillators,·and even·ESD-proof I/O pads.·All these structures were first fabricated on test chips and thoroughly tested before being applied to the final chip. This resulted in known-good blocks which could be confidently applied to the overall design. Then, the whole chip was fabricated and tested at·many·levels, in order to fix any problems resulting from integration and to fine-tune the clocking system and memory timings. The final chip, which is the only version we've ever sold, is the third iteration of this whole-chip process.

Towards the end of development, we invested in a Micrion FIB machine and a Schlumberger·e-beam prober to diagnose any problems and fine-tune the silicon. While the money to buy these used machines·was only about 0.5% of what they cost new, the time needed to get them running and to learn how to use them was a good six months. Now, we can do our own maintenance work·on them, which is not trivial. These machines·made it possible to see what was actually happening on the silicon (contactless, non-loading, 7Ghz oscilloscope function via an·electron beam)··and to perform modifications (via gallium beam and metalorganic gas)·before having another full chip made. All this was a huge adventure in itself, but invaluable in getting the silicon perfected.

I believe that the Propeller has received more attention to its quality than likely any other microcontroller in production. Big companies would never approach·such a project in the way we did. It wouldn't make any sense to them. They have a formulaic path·they follow which·minimizes design time and·ensures interchangeability of engineers, in exchange for a passable result. This involves RTL hardware descriptions, synthesis, place-and-route, IP blocks,·etc. It's·mainly managed chaos, not bottom-up design. The Propeller is correct by construction, not just given a stamp of approval by some $500k·software tool that managed to close timing on an inefficient·rat's nest of wiring and synthesized gates, that is bound to be big and power-hungry. The other fact is, big companies don't cultivate an environment in which any individual would have·the occasion, let alone reason, to know everything about a design, and then be able to ensure quality throughout. They rely on teams of people, none of whom knows everything about the chip. They also leverage IP developed by yet other people, in order to avoid reinventing the wheel. Even if the IP isn't buggy, it's rarely a perfect fit. If you've ever programmed Windows apps, you know how frustrating it is to be forced to rely on questionable black-box objects to get your application done. It's like trying to build a custom home, but being limited to shopping at·WalMart's Garden Center·for your building materials. The Propeller·comes from the antithesis·of this approach.

We should have a data sheet soon with quite a bit of characterization data in it. I hope it·will give people more confidence about using the chip. I think people's response so far on the forum validates what I've said here about quality, though. It is no accident or windfall that the Propeller is tough and reliable (not to mention low-power). It's very intentional.

I want people to·understand that big companies don't have a monopoly on quality. Many of the ways in which they do things actually undermine quality in the quest for expediency. We took the time to do everything right on the Propeller, and left no stone unturned.

We plan on a very long sales life for this chip, and have no intention of dilluting the concept with many slight variants, for which you'd inevitably be getting end-of-life notices for after a few years. This is good news for customers because they are the ones who·are going to be making investments in programming that will, in sum, dwarf the energy that we spent making the Propeller. We made a platform that is, hopefully, deserving of their coming efforts.


P.S. Kloss, I'm glad that you voiced your skepticism. I'm sure it's shared by others.·I needed this·impetus to explain a few things. Thanks.

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Chip Gracey
Parallax, Inc.

Post Edited (Chip Gracey (Parallax)) : 3/31/2007 8:16:21 AM GMT

QuattroRS4
02-06-2007, 08:24 AM
Wow

gives me even more confidence using Parallax products - Chip - it is obvious you all hold this dear to your hearts .. well done - maybe the antithesis - should be the thesis !


Chip - can I use this in a parts and operators manual for my machines - this has Quality all over it....
I am going to make a poster of this also if thats ok with you ? and put it in the workshop .... would
look great for customers and maybe inspire staff .........

Its out of the park .....

Kloss - Like I said the mentioned industrial app was not a Parallax / Propeller issue - I was only stating that I had it out there and my only problem was with a 3rd party 3 phase motor - easily sorted by a filter...

Bleeding edge - gives the edge ! - It has already proved itself and orders for more machines - specifically requesting the same type of control and display are already on my desk - I have never been so busy and excited by a chip in my career.


************************************************** ***********************
We need this verbatim in PDF form - with a Chip Gracey signature at the end .(no - not signature - Autograph !)

for the moment its here as an attachment ...


Goosebumps anyone ?

Quattro

Post Edited (QuattroRS4) : 2/6/2007 12:54:16 AM GMT

Brian_B
02-06-2007, 08:49 AM
Again, WOW !!!,

BTX
02-06-2007, 09:03 AM
Does anyone, has another question about propeller ?.http://forums.parallax.com/images/smilies/idea.gif

Great Chip.

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Regards.

Alberto.

OzStamp
02-06-2007, 10:08 AM
Hi All and Quattro...

Like anything new with engineers... it takes time .. why live outside the comfort zone.

The Propeller is like the Audi quattro of the 80's it came on the scene it took everybody by surprise
and blew the competitors away for a few years. It dominated the rally scene for years..

The Propeller has an unfair advantage... it is now well priced.. it will be succesfull no doubt.

Ronald Nollet Australia

QuattroRS4
02-06-2007, 10:13 AM
Oz,
Close to my heart - had a 'shorty' a few years back - have the new Quattro now RS4 B7 420BHP 4.2L - its new ,its cool and its fast ! - Just like the prop !!!

have attached an image of it for you....

Post Edited (QuattroRS4) : 2/6/2007 4:19:55 AM GMT

Brian_B
02-06-2007, 10:15 AM
Chip,
I sent a copy of this to Max Maxfield , he writes computer books & writes columns for various trade publications.

Brian


PS. I know most of us are not employees of parallax but I would like to think that we all·are helping carry out the dream !

Post Edited (Brian Beckius) : 2/6/2007 11:52:30 AM GMT

OzStamp
02-06-2007, 10:21 AM
Hi

0-80MHZ in no time ( 0-100 KMH how fast Quattro ??)

The Prop accelerates nicely after the wait pin type (various types) instruction... awesome.
It is amaziong how it can sit asleep and wake up and run fast so quick.. .. totally cool.
To have that available in spin and in asm is great ...

Ronald Nollet Australia

QuattroRS4
02-06-2007, 10:25 AM
Listed 4.8sec to 100KM/h - actual 4.4sec - seems like a lifetime compared to the prop - hate to be an electron on the prop - death by G-Force !!!!

The prop is truely outstanding - Like I said the first time in years I have been excited by with a chip !!!

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'Necessity is the mother of invention'

Those who can, do.Those who can’t, teach.

Post Edited (QuattroRS4) : 1/24/2009 2:32:19 AM GMT

OLTAdmin
02-06-2007, 12:00 PM
I just became a member to say, Why has this not become a sticky yet?
Every one should read this post, not only does it say what a quality chip the prop is but what a quality company Parallax is. And frankly what a god damn genius Chip is.

Thank You Chip and the rest of Parallax for all your hard work. Your products are what got me into micro controllers and what keep me motivated.

Lyle

AndreL
02-06-2007, 12:03 PM
I would also add that although it doesn't have a formal data sheet and formal tests are being done after the fact. The chip has been tested very well. The game software literally uses every bit of storage and runs every single mip and processor, for months on end I had propellers running 24/7 doing every possibly conceivable thing to them and using every single byte of memory, all cogs, and the I/O is just being beat to death, so although you are never 100% sure of anything. In fact, I had some of the same arguments when I started this project, very little formal testing had been done, that's why the games we developed are also testing beds, they are the highest performance apps to date on the propeller, and they work 100% all the time (other than bugs in the software), so the development of the hydra as well, really threshed out the propeller with large programs and not just toy apps like motor controllers, filters, etc. we had to push the chip to get it to do magic with graphics, and it was able to withstand the pushing and not break.

I can tell you that definitely the chip seems sound from a actual 24/7 operational status with full 100% silicon usage.

The last kind of tests really are MTBF under long term use studies.

But, of all the microcontrollers I have used, many of them have little problems and bugs, and thus far the propeller seems to have no problems thus far.

So I would have no reservations is saying use it for industrial applications, embedded systems, toys, and other products.

Andre'
·

crgwbr
02-06-2007, 10:30 PM
I'm working on integrating the propeller into an industrial product right now.· I'm glad this post came up; now when the head engineer asks how durable the electronics are, I'll be able to answer him.

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NerdMaster
For
Life

Ym2413a
02-07-2007, 01:03 AM
The Propeller just works!!!

Sometimes I forget I'm programming a single chip microcontroller...
Instead thinking I'm programming a full retro computer with RAM, VideoCard, SoundCard and so on.

I've never seen a single chip do so much and all from a single package.

RytonMike
02-07-2007, 02:24 AM
Going back to Kloss' original commnets:

If you are designing and building a safety critical system then you are concerned about understanding what could fail and what you are depending on to prevent or tolerate these failures. These are matters of engineering skill and professionalism and when you know you are doing this properly, you get a real sense of pride and achievement.

If you are selling safety critical systems then you are concerned about product liability and how the risks it presents can be off loaded to the providers of the components and tools you are using or to other third parties such as insurers or the publishers of standards. These are legal, commercial and actuarial matters and when you do them properly you tend to make money.

I have the impression that what Chip says belongs to the first set of “realities” and that what Kloss is on about belongs to the second. Both are necessary for progress.

I hope Chip (and Parallax) continue to make sufficient money because the results of his engineering represents a lot of stimulation, opportunity and interest for the rest of us. When making money becomes the primary objective you end up with stuff like Windows…
:-/

crgwbr
02-07-2007, 02:34 AM
RytonMike said...
When making money becomes the primary objective you end up with stuff like Windows…
:-/

At the moment Parallax is like Linux (greatest thing ever), please don't screw it up and become windows (http://forums.parallax.com/images/smilies/nono.gif·).

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NerdMaster
For
Life

Ym2413a
02-07-2007, 03:20 AM
crgwbr said...

RytonMike said...

When making money becomes the primary objective you end up with stuff like Windows…
:-/


At the moment Parallax is like Linux (greatest thing ever), please don't screw it up and become windows ( http://forums.parallax.com/images/smilies/nono.gif ).


Yeah 'cause Windows sucks!. (IMO)
We don't want another windows. (lol)

asterick
02-07-2007, 04:42 AM
Oh, BTW, there is 8 more colors that no one seems to use, the super saturated ones. %0000_1000 (with all 16 phases). Since it ossillates between +1 and +7. (That was horribly off topic)

Paul Baker
02-07-2007, 06:09 AM
OLTAdmin said...
I just became a member to say, Why has this not become a sticky yet?

The thread is now sticky.

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Paul Baker (mailto:pbaker@parallax.com)
Propeller Applications Engineer
[/url][url=http://www.parallax.com] (http://www.parallax.com)
Parallax, Inc. (http://www.parallax.com)

paulmac
02-07-2007, 07:21 AM
Thanks Chip.

It was really nice to read that. It's nice to see a company so obviously concerned with things other than just making money. Thanks for not just "slapping something together" and then talking it up.
It's obvious that you have vision and passion. Long may they last.

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I stand on the shoulders of giants

Joel Rosenzweig
02-07-2007, 10:49 AM
Chip,

I am getting ready to complete a commercial device that uses the Propeller.· The device is fantastic.· I have some limited environmental testing to complete and could use some more information from you.

My interpretation of the temperature testing "TMCL·- Tempurature cycle, air, standard ramp: -65șC to 150șC, 500 cycles" is that the device undergoes thermal cycling and then after that, the device is checked to make sure that it still works (at some given temperature).

I want to know the operational temperature range for the part.· Do you have this information?

Regards,
Joel-
·

QuattroRS4
02-07-2007, 10:59 AM
Have a look at this post - Tracey Allen has done some impressive tests -

http://forums.parallax.com/forums/default.aspx?f=25&m=169486

I have an industrial·application running faultlessly in a cabinet and have measured the cabinet ambient at @ 70 deg C - the prop is the is the 'coolest' I.C on the board .

So commercial Temperature range will not be a bother..

I believe a DataSheet is iminent !

Post Edited (QuattroRS4) : 2/7/2007 3:11:45 AM GMT

Paul Baker
02-07-2007, 12:02 PM
Joel, we plan on testing it at automotive range (-40 to 125 C), but as Tracy's tests have shown, this isn't necessarily the limits of operation.

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Paul Baker (mailto:pbaker@parallax.com)
Propeller Applications Engineer
[/url][url=http://www.parallax.com] (http://www.parallax.com)
Parallax, Inc. (http://www.parallax.com)

cgracey
02-07-2007, 01:28 PM
Joel,

Like Paul said, it will work across quite a temperature range. I hope we'll be able to quantify the range soon.

As for your question about TMCL testing, you're right. The device is cooled and heated for 500 cycles·and then, presumably at room tempurature, it is re-tested.


Joel Rosenzweig said...
Chip,

I am getting ready to complete a commercial device that uses the Propeller.· The device is fantastic.· I have some limited environmental testing to complete and could use some more information from you.

My interpretation of the temperature testing "TMCL·- Tempurature cycle, air, standard ramp: -65șC to 150șC, 500 cycles" is that the device undergoes thermal cycling and then after that, the device is checked to make sure that it still works (at some given temperature).

I want to know the operational temperature range for the part.· Do you have this information?

Regards,
Joel-


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Chip Gracey
Parallax, Inc.

wastehl
02-07-2007, 04:26 PM
The propeller is a very well implemented chip. We expect to deploy many of them in industrial and consumer applications. I hit one with a 4,200 amp surge and it survived intact, tough indeed.

glentech
02-08-2007, 01:28 AM
Don't try 12 volts to an input like I did (accidently) and fried misc inputs here and there.

QuattroRS4
02-08-2007, 04:39 AM
Based on conversations - I faced a blow heater into a cabinet on an industrial·app. for about an hour today - let me tell you it was hot - there was·no bother at far >85deg C either .... test stopped due to 'industrial grade' PSU over temp shut down. When PSU cooled all ran sweet ... I think this (the prop) could be far greater than many expectations..

Post Edited (QuattroRS4) : 2/9/2007 6:25:19 AM GMT

cgracey
02-08-2007, 04:53 PM
I made some changes to the "Why the Propeller Works" document and we turned it into a pdf,·as one of you suggested. We're going to post this on the website for general consumption soon. Just an FYI. Thanks for your encouragement.


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Chip Gracey
Parallax, Inc.

Post Edited (Chip Gracey (Parallax)) : 2/8/2007 7:16:14 PM GMT

QuattroRS4
02-09-2007, 02:05 PM
Decided to post a few images of 'Industrial App' during test/Prototype build while still on veroboard - loads of changes since - now on completed pcb after successful trials.....will upload completed images and details soon..

EDIT: Rereading old post and noticed I forgot to add a P.C.B cmpleted image after test .. so its there now ..


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'Necessity is the mother of invention'

Post Edited (QuattroRS4) : 8/2/2007 10:48:12 PM GMT

Kloss
02-12-2007, 09:27 PM
Chip Gracey (Parallax) said...

Kloss said...

PPOT - Pressure pot, autoclave: 121șC, 100% RH, 15 PSIG, 336 hours
TMCL - Tempurature cycle, air, standard ramp: -65șC to 150șC, 500 cycles
PREC - Preconditioning (simulates soldering process): 30șC, 60% RH, 192 hours
HTSL - High tempurature storage life: 150șC, 1000 hours
ESD HBM - ESD human body model: All pins tested up to +/-8kV



Chip,

glad to hear that you are performing tests.
These tests are perhaps 1/4 of what we are doing with our final products.
Especially the EMC tests are missing. (And I'd add a corner drop test to the ESD tests).
You know the AEC Q-100?

cu
Karl

Brian_B
02-12-2007, 10:00 PM
If I made and sold microcontrollers for a living , I would be worried too.

Brian

QuattroRS4
02-13-2007, 02:16 AM
Brian,

Well 5 propeller based machines in and running with each having processed > 10 million products (1.4 to 2million/day each ) - and not as much as a glitch - have videos and pics to upload soon.

Also have BS2's in an even harsher environment - have been running 24/7 since build.

With regards to the prop based machines - all the datasheets in the world do not or could not point to absolute suitability for any given application - what generally happens is that they are a guide and implementation and references to actual 'real world' applications point towards suitability. Prior to installation the customer was aware that there was not any real reference sites or comprehensive data available for the prop - however based on previous projects I had successfully completed for them and prior to Chips 'Why the Propeller Works' document - they were more than willing to install - that position was further enhanced when they read the document and after the successful trial period had expired with Zero issues.- these people are the leaders worldwide in what they do and they like to be first ... I can't justify my stand point on this one any more but feel that time will prove this to be a good decision. I am also grateful to the customer to allow this to happen - I have since moved on to yet more Propeller based applications.

Brian_B
02-13-2007, 02:35 AM
I wasn't talking about parallax. I was talking about the other companies.

QuattroRS4
02-13-2007, 02:39 AM
Brian - my Apologies .... I couldn't agree more - Had a few machine designers wondering what the machines were running - you could tell that they too were bothered by the props capabilities...
·

Brian_B
02-13-2007, 02:57 AM
I've found that when people start throwing out that there product is tested so much better than yours , the more worried their getting. http://forums.parallax.com/images/smilies/smile.gif

Brian

cgracey
03-02-2007, 03:14 PM
Here's something that I really want to share that doesn't deserve a thread, as it's somewhat off-topic, but it relates to quality. It's about how NOT to do something. It's also about how a lot of stuff, unfortunately, gets done.

My hot tub controller died a while back, and while it was·likely·some·sub-$10 part that failed, I thought I'd call in the experts to just fix it. That way, I wouldn't have to worry, right? I would pay money to get around diverting my attention from stuff I'd rather think about. Well, it's a long, sordid story, but I'll keep it brief.

There have been three visits so far by 'technicians'.

The first guy was convinced that·the top-side control panel was the brains of the machine, and it needed replacing. It was just some LEDs and buttons with a huge ribbon cable going back to a PIC chip in the main controller box. I couldn't convince him it was not the problem, so I pulled the panel off in front of him, as I was already resigned to getting a whole new controller. I didn't want to waste a week (and their money) on a pointless experiment. He wrote me up on his service sheet "Customer pulled up top-side control, ripped ribbon out of unit."

A few days later, the new $900 controller had been installed while I was at work. I came home and went to see it, and I thought for sure he must have had to leave in a hurry and would·be back any minute, because the backs of the pump motors were off, the AC mains conduit wasn't·secured to the controller,·and fittings were scattered all over, not to mention garbage. I called him up·and it was·clear that he was 'done'. He was surprised I was worried about anything. He said·having things in that state·"wasn't a problem".

That night, I was in bed and heard a loud 60Hz buzz for 5 seconds and then a "Pop!". It kept repeating every minute. I went out there to catch the next one, and a blue arc lit up the backyard. The problem was a bad motor, which had probably killed the first controller. The contactor would close, the motor would short, and when the contactor released, it would arc as the field collapsed.

Another guy came out the next day and while I was on the phone with him at work, he saw this happen for himself. So, we needed a new main motor for $400. Let's get an ozone generator, also, for $200. That would really wrap things up nicely. I love the smell of ozone and it keeps things so fresh.

So, today, I came home and went to see the final fruits of all this money and time. Check it out:

http://forums.parallax.com/attachment.php?attachmentid=45689

I should probably ask him how often he recommends I change all that cardboard out. My plan now is to ask the owner of the spa shop to just come out, himself, and make it right. I'd be content with that. Sheesh! You think his son might be working for him?

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Chip Gracey
Parallax, Inc.

Post Edited (Chip Gracey (Parallax)) : 3/2/2007 7:48:07 AM GMT

bambino
03-02-2007, 09:30 PM
My condolences Chip,

My 3rd job is assistant to an electrician. He's old school pushing 60 and 40 of those years are in the field.
90% of the jobs I help him out with is to fix what other contractors have screwed up and got paid for.
And I seldom hear of his clients getting retrobution, other than selling back the brand new components when all that was needed
was a capacitor replacement. And really, Should plumbers be allowed to work on electrical any way( They should at least change cloths first!)

QuattroRS4
03-04-2007, 03:11 AM
I thought this was going the direction - Controller was destroyed - so you built a prop based one !

What a disaster !

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'Necessity is the mother of invention'

BTX
03-04-2007, 09:24 AM
Now I'm feeling better, I think that in my country, were the only one place where that things happend !!.
If you want to do it better, do it by yourself !! and very very cheap too !! then you could order a killer for them :-(
That's why the PIC don't work ??......

So sorry.. for your problem, really.

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Regards.

Alberto.

Skogsgurra
03-31-2007, 04:03 PM
Time to edit the OP so it says that there IS a data sheet now.

Facts like "There's no data sheet!" tend to stick. Better get it corrected quickly to avoid misunderstandings.

cgracey
03-31-2007, 04:16 PM
Skogsgurra said...
Time to edit the OP so it says that there IS a data sheet now.

Facts like "There's no data sheet!" tend to stick. Better get it corrected quickly to avoid misunderstandings.
Good thinking! I just put a RED note into the first post of this thread and on Monday I'll get the other stuff updated. Thanks for pointing this out.

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Chip Gracey
Parallax, Inc.

ErNa
05-31-2007, 04:30 AM
Hello, just want to congratulate! I work with the propeller, for all the reasons mentioned by Chip in his paper "Why the propeller works". Great! ErNa

JTC
06-03-2007, 06:19 AM
· I have used other Parallax products and have no hesitation to use the propeller.

I have 3 projects going that use the propeller. One in an idustrial invironment,

one in HVAC, and another that I can't discuss. My only issues are with my learning

to progam it in an efficient manor. I am learning and the forum is a great source of hlep.

Great work Chip !

Jim Cullins

Sound Logic

cgracey
07-20-2007, 03:34 AM
We've been temperature testing the Propeller chip with our new climate chamber.·The chamber·goes from -73C to 190C. The Propeller has perfrormed perfectly throughout this entire temperature range at full speed (80MHz) with all cogs running.

Note that 'military' temperature rating is -55C to 125C, so the Propeller has exceeded that by a good margin on both ends. We don't have the means to go below -73C, though we could use a heat gun and thermocouple·to go higher than 190C. The melting point of most lead-free solders is 215C+, though, so 190C is already very close to the limit of solder. By the way, the melting point of good old eutectic tin-lead solder is only 183C, so we tested beyond that!

During the temperature test, the Propeller operated off a 5MHz crystal and a 24LC256 EEPROM. Brownout reset was enabled. We had to supply an externally-regulated 3.3V for power·since the Prop Demo Board's voltage regulators were going into the thermal shutdown due to ambient heat.

Here's a video we made of the heat test:

http://www.youtube.com/v/EjkXokgcBZw (http://www.youtube.com/v/EjkXokgcBZw)

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Chip Gracey
Parallax, Inc.

Post Edited (Chip Gracey (Parallax)) : 7/19/2007 7:41:43 PM GMT

Bryan K.
09-05-2007, 05:58 AM
dealing with spa and hot tub technicians is definitely hard to do. It was just easier and more expensive just to update our hot tub and get a new one. The control boards, although convenient to replace and install, are very pricey.

jmg
01-10-2009, 08:58 AM
+/-8kV is a relatively high number, but it is unclear what they were looking for.

Most industry tests confirm post-test that the IO leakage limit is still met.
(ie the device still meets the data sheet spec )

Q: Did the parallax test chips, still meet the +/- 1uA [-55..125'C] Data sheet spec,
on every pin, after the 8KV Zaps ?

tonyroberts09
01-12-2009, 09:01 PM
I'm working on integrating the propeller into an industrial product right now. I'm glad this post came up; now when the head engineer asks how durable the electronics are, I'll be able to answer him.

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tonyroberts09

NuTtY_Pr0fFeSs0R
01-11-2010, 08:49 PM
Can I get a woop woop!