I want to use an 3.3 V micro controller in my industrial control project. but 3.3 V microcontrollers has lower supply voltage and ground voltage noise margin band than 5V microcontrollers.
is that a problem in industrial environments. Because Industrial environments has lots of electrical noise.
Yes the noise margins are smaller, and smaller noise signals have a higher probability to interfere, unless catered for in the design.
But, with good design and protection against what is expected to interfere with the operation EMI and other interference can be "well managed" in a design.
Silicon manufacturers are under increasing preasure to provide lower cost silicon, this means shrinking the silicon die, which means the Vdd is reducing in proportion also.
As the die shrink, More EMI, Electrostatic protection is usually required externally.
Joe
In some cases, manufacturers are offering parts with minimum flash retention that is unacceptably low for industrial applications (e.g.
10 years), although it's probably okay for something like a cell phone.
Maybe a philosophical discussion, but automotive applications with 3.3 V uC are working in a more harsh environment (at least they are tested harder). So I see no problem to it use in an industrial application.
Dieter
It probably makes little difference in real life, whether you have to attenuate a kilovolt spike by 80 dB or 83.
What is a "ground voltage noise margin band"?
John
For automotive the CAN bus is mostly 5v but at a deeper core PCB level, 3v3 is being used with more and more.
I confirm the Automotive OEM manufacturers do have very tough specification which 3v3 electronics is already passing.
JG
Also the newer parts tend to be in smaller packages too, so connections are shorter, parts are closer together. The faster signals encourage use of ground and even power planes. This all helps to improve the EMC susceptibility.
On Sat, 13 Jan 2007 07:51:28 -0800, John Larkin
Maybe a "ground voltage noise marching band"?
I think I saw those guys in Pasadena recently.
Best regards, Spehro Pefhany
In California there is an increasing likelihood that it could have been the "ground voltage noise marchiachi band".
Couldn't you tell from the noise, or is it possible that it was just another bad band?
noise margin is lower. but you may employ differntial signaling to the outside world to ameliorate the effects of eternal noise and a low noise margin. Most of the current and planned Up and wirless modules use 3.3 volts nominal. Tis cuase a ratf of issues when interface to external parts and especially throwing relays etc. The difference betwen designing from 12 volts , 9 5 volts in minor, goingn from 5 to 3.3 requires extra work ad thinking.
Marc
snipped-for-privacy@att.net to continue the conversation
I bought an "Easy" boton from Staples, but I can't quite make out what it is saying.. ___ ___ fácil. Any idea?
Best regards, Spehro Pefhany
Its saying, "Sucker".
LOL. Well, it was $4.99 ($0.01 more than the English one, for some reason). It's already provided more than enough amusement.
Best regards, Spehro Pefhany
Like I tell people, "My sense of humor has a "Warp" drive! ;-)
Wouldn't it have been more fun to buy a tap light at a dollar store and make you own? BTW, there are hacking sites for those easy buttons.
Eso era facil? Thanks for the hint, I was always wondering where people got these things.
Sounds more like "ahsee da fácil" (first two words spelled as they sound to me). Eso de fácil, maybe, but Google doesn't find it wrt Staples.
Best regards, Spehro Pefhany
Hmm, strange. I can imagine Eso and Esto for This and That. Maybe let a native speaker listen in?
guys, i work at a automotive company and i have discuss the issue with a experienced engineer. he think that you can use 3.3V system, but you need special design you I/O. As you know, battery voltage range from 6-at least 27V. i also know that a 3.3V system pass automotive EMC test.
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