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'EEPROM or FLASH which is better?'
1999\10\27@172528 by Lea

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       Hi, all.
I'm on a proyect to build a small and very dumb controller to drive a stepper
motor, the program just start when one pin go to low state and move the
motor at about 80pps for 10 seconds, that part is O.k. works fine,
but It must work fine at the space for about a week, shuttle nominal
altitude, so the question is: which kind of device to do this is better:
EEPROM, EPROM or FLASH??.

I know that radiation and high enery particles erases most memories but
if the enclosure is good they will need more than a month, may be more to
erase at least 1 bit (I'm talking about EPROM) but I have no idea about
the other kind of memories EEPROM and FLASH.
have someone an idea which will be the difference in this enviroment?
I need to make a decision about the pic to use for that app.
thanks!.
  Leandro J. Laporta (LU2AOQ)
  mail: spam_OUTlu2aoqTakeThisOuTspamyahoo.com
  wrk: Arg. Assoc. for Space Technology.
  ham: TCP/IP high speed group HSG

1999\10\27@190435 by John C. Frenzel

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My top 3 choices are:
1- OTP
2- OTP
3- One Time Programmable (equiv of a prom)
the memory is nonerasable
John

>         Hi, all.
> I'm on a proyect to build a small and very dumb controller to drive a
stepper
{Quote hidden}

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1999\10\27@201324 by Wagner Lipnharski

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Lea wrote:
>         Hi, all.
> I'm on a proyect to build a small and very dumb controller to drive a stepper
> motor, the program just start when one pin go to low state and move the
> motor at about 80pps for 10 seconds, that part is O.k. works fine,
> but It must work fine at the space for about a week, shuttle nominal
> altitude, so the question is: which kind of device to do this is better:
> EEPROM, EPROM or FLASH??.
[snip]

Go for the Flash.  Sooner than you can think the other devices will be
extinct. Probably the IAAAE (International Association Against Animal
Extinction) will be trying to keep them alive in captive zoos or
jurassic islands.... :)
--------------------------------------------------------
Wagner Lipnharski - UST Research Inc. - Orlando, Florida
Forum and microcontroller web site:  http://www.ustr.net
Microcontrollers Survey:  http://www.ustr.net/tellme.htm

1999\10\27@213748 by McMeikan, Andrew

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face
Well if you can't embedded it in an astronaught, then a metal box should do
the trick,  if its only 100-150k's up then radiation isn't you main concern,
I would be more worried about temp extremes and trying to stop the stepper
from seizing up (I am assuming that this will be exposed to vacuum?  you
will need to repack the bearings with Fomblin(sp? $$) grease so it wont
seize up.

Will this project be attached to anything else?  If it is small and free
floating then watch out for accumulating a large charge, treat as you would
a sensitive ESD.  If it really has to stay up for a long time, consider an
electron gun to bleed charge off.

       cya,    Andrew...

> {Original Message removed}

1999\10\27@223307 by bill

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OTP is just normal EPROM without the window.  They're the same dies, so
they are no less vulnerable than the windowed EPROM parts.

> My top 3 choices are:
> 1- OTP
> 2- OTP
> 3- One Time Programmable (equiv of a prom)
> the memory is nonerasable
> John

---
                                       Peace,
                                       William Kitchen
                                       .....billKILLspamspam@spam@iglobal.net

The future is ours to create.

1999\10\28@090308 by M. Adam Davis

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Well, if you are *really* concerned about radiation, you might inquire
within microchip to make a few mask rommed parts.  These are parts where
the code is part of the silicon when the chip is made.

But they might not have the ability (or desire) to make just a few for
you...

-Adam

Lea wrote:
{Quote hidden}

1999\10\28@102150 by Lea

picon face
At 09:01 AM 10/28/99 -0400, you wrote:
>Well, if you are *really* concerned about radiation, you might inquire
>within microchip to make a few mask rommed parts.  These are parts where
>the code is part of the silicon when the chip is made.
>
>But they might not have the ability (or desire) to make just a few for
>you...

Hi adam!, you are right!.
thanks 4U reply, but I think that I don't have enough time to
do this, because I only need 4 uP (12C508), 2 for the proyect and 2 for
backup, and because I'm living in argentina and here is very difficult
perhaps impossible to get a special part in less than 2 months (I have
to get the unit ready in 30 days!!), thanks anyway :).

some hours ago william wrote:
>>OTP is just normal EPROM without the window.  They're the same dies, so
>>they are no less vulnerable than the windowed EPROM parts.
>
> My top 3 choices are:
> 1- OTP
> 2- OTP
> 3- One Time Programmable (equiv of a prom)
> the memory is nonerasable
> John

Thanks John and William for you reply too.
I thought that OTP was the right choice But I decide to see what will you
piclist people think about, because I'm pretty shure that a lot of you here
have more knowledge and experience than me :).
I didn't know that OTP and EPROM are the same but, no window, may be because
quartz windows are expensive?.
Anyway for high energy particles window o no window they will pass through
anyway :).

                                        :-)
>Well if you can't embedded it in an astronaught, then a metal box should do
>the trick,  if its only 100-150k's up then radiation isn't you main concern,
>I would be more worried about temp extremes and trying to stop the stepper
>from seizing up (I am assuming that this will be exposed to vacuum?  you
>will need to repack the bearings with Fomblin(sp? $$) grease so it wont
>seize up.

Hi Andrew! thanks, no the stepper and controller are part of an experiment
on a G.A.S. canister (G-761) that will fly (we think) in about 5 or 6 month
on the cargo bay of the space shuttle, this controller are one of the seven
experiments on that canister, the enviroment inside the canister is
pressurized at about 10 psi (if I remember correctly), and the temperature
will be in the range of -10 to +70 (inside of the automotive specs for
microchip) so I think that will be no problem.

see you all , thanks bye.


  Leandro J. Laporta (LU2AOQ)
  mail: .....lu2aoqKILLspamspam.....yahoo.com
  wrk: Arg. Assoc. for Space Technology.
  ham: TCP/IP high speed group HSG

1999\10\28@102353 by Don Hyde

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I'm sure they won't mind making just a few masked rom parts, but they will
have to charge you for the whole wafer.  Remember, chips are cut out of
wafers, which are pretty big these days (6" or 8"), and yield 1000 or more
chips.  It costs thousands of dollars and takes over a month for a wafer to
pass through all the 30+ processing steps before being shipped to Thailand
for packaging.  That's why there is a minimum order and and time for masked
parts.

> {Original Message removed}

1999\10\29@160056 by Janko

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Hi,

in harsh environment 100% yes. Flash can be erased by spikes trhrough VCC or (ra
rely) I/Os.

Jan.
{Quote hidden}

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