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'[EE] Circuit isolators...'
2006\05\08@155800 by Przemyslaw Lopaciuk

picon face
Hi,

I need to fully isolate two boards which are connected with 34 PIN
cable. ( one board is mine so I can redesign it ).

I found some optocouplers but they have only 4 channels so it would mean
putting 8 ICs on board which doesn't seem to be a very good idea.

Does anybody know any other possible way of isolating these boards?



Thank you very much,

Sam





2006\05\08@162329 by David VanHorn

picon face
On 5/8/06, Przemyslaw Lopaciuk <spam_OUTpicTakeThisOuTspamamusementcity.com> wrote:
>
> Hi,
>
> I need to fully isolate two boards which are connected with 34 PIN
> cable. ( one board is mine so I can redesign it ).
>
> I found some optocouplers but they have only 4 channels so it would mean
> putting 8 ICs on board which doesn't seem to be a very good idea.
>
> Does anybody know any other possible way of isolating these boards?


You'll need to say a lot more about what's on those 34 pins.
Voltage, current, impedance, frequency, risetime/falltime...

Otherwise, just unplugging the cable ought to isolate them quite nicely. :)

--
> Feel the power of the dark side!  Atmel AVR

2006\05\08@165418 by Vasile Surducan

face picon face
Parallel busses are difficult to isolate. The cheapest way is the
optocoupler, there are 4 and 8 in one pack. But if you have also speed
requirement, then optocoupler must have internal schmidt trigger and a
logic gate inside. Check at Agilent, but there are many other
producers.

Vasile

On 5/8/06, Przemyslaw Lopaciuk <.....picKILLspamspam@spam@amusementcity.com> wrote:
{Quote hidden}

> -

2006\05\08@173044 by Jesse Lackey

flavicon
face
TI just came out with some capacitor-based digital isolators, higher
speed / lower power than opto, and not so cheap either, as I recall.
Maybe you can get more in a single IC though.  Anyway, browse TI for a
bit.  Plus, for USA people anyway, their samples policy is absolutely
the best... (sent out from digikey w/free overnight shipping!)

J

Vasile Surducan wrote:

{Quote hidden}

>>-

2006\05\08@182326 by Przemyslaw Lopaciuk

picon face
Speed wouldn't be more than 10MHz.
Signals are a bus. It is a bus driven by Intel N80C188.

Regards,
Sam

{Original Message removed}

2006\05\09@085832 by William Bross

picon face
Przemyslaw Lopaciuk wrote:

>Speed wouldn't be more than 10MHz.
>Signals are a bus. It is a bus driven by Intel N80C188.
>
>Regards,
>Sam
>  
>
You might want to check out http://www.silabs.com and their new Si844x
series digital isolators.  There's four per SO-16 pack so they should
save some room physically.  I'm getting ready to order samples to play
with so I can't offer any real user data, but they do look promising.

Bill

2006\05\09@122335 by Vasile Surducan

face picon face
On 5/9/06, Przemyslaw Lopaciuk <.....picKILLspamspam.....amusementcity.com> wrote:
> Speed wouldn't be more than 10MHz.
> Signals are a bus. It is a bus driven by Intel N80C188.


You're not very generous with explanations. Which is the lenght, which
is the technology for bus hardware implementation (cable, dual layer,
more layers?), does the bus contains sampling clocks ? There are some
fast timing requirements on that 10Mhz bus ? Could be LVDS, LVTTL, TTL
or CMOS ?
I'm too lazy to search for the N80C188, but number looks something old
or obsolete...

greetings,
Vasile

>
> Regards,
> Sam
>
> {Original Message removed}

2006\05\09@123557 by Michael Rigby-Jones

picon face


>-----Original Message-----
>From: EraseMEpiclist-bouncesspam_OUTspamTakeThisOuTmit.edu [piclist-bouncesspamspam_OUTmit.edu]
>Sent: 09 May 2006 17:24
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE] Circuit isolators...
>
>
>On 5/9/06, Przemyslaw Lopaciuk <@spam@picKILLspamspamamusementcity.com> wrote:
>> Speed wouldn't be more than 10MHz.
>> Signals are a bus. It is a bus driven by Intel N80C188.
>
>
>You're not very generous with explanations. Which is the
>lenght, which is the technology for bus hardware
>implementation (cable, dual layer, more layers?), does the bus
>contains sampling clocks ? There are some fast timing
>requirements on that 10Mhz bus ? Could be LVDS, LVTTL, TTL or
>CMOS ? I'm too lazy to search for the N80C188, but number
>looks something old or obsolete...

It's the 8bit databus version of the 80186, a "high integration" 8086 with on board timers, DMA controller, interrupt controller etc.  An x86 processor for embedded applications really, which is where most of them were used (though I used to have an XT motherboard with a 80186 in my junk collection).

Regards

Mike

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2006\05\09@125348 by Przemyslaw Lopaciuk

picon face
The situation looks like that...
I've got a board with Intel N80C188. It runs at 24MHz.
It stores information in NVRAM Dallas DS1225AD-150. So it is CMOS.
I want to listen to what it is storing in that RAM.
Boards are connected with ribbon cable. ( BTW do you think that it is a
good idea to use ribbon cable for that kind of purpose? )
I can only tell that listening to what is going on on that bus is a
tricky business. If somebody has some experience with something similar
I would be very grateful for some knowledge sharing.

Best regards,
Sam



{Original Message removed}

2006\05\09@150447 by Robert Ammerman

picon face
You want a logic analyzer.

Bob Ammerman
RAm Systems

----- Original Message -----
From: "Przemyslaw Lopaciuk" <KILLspampicKILLspamspamamusementcity.com>
To: "Microcontroller discussion list - Public." <RemoveMEpiclistTakeThisOuTspammit.edu>
Sent: Tuesday, May 09, 2006 1:00 PM
Subject: RE: [EE] Circuit isolators...


{Quote hidden}

> {Original Message removed}

2006\05\09@164615 by William Chops Westfield

face picon face
>> Speed wouldn't be more than 10MHz.
>> Signals are a bus. It is a bus driven by Intel N80C188.
>>
I think 10MHz is "very fast" for an isolated bus.  But that's not
really what you mean, is it?  You have the 80c188 (high integration
version of the Intel 8088) running at 10MHz and you want to connect
it to some peripheral in an isolated manner?

IIRC, the x88 has bidirectional databus, which will further complicate
things...

BillW

2006\05\10@064255 by Vasile Surducan

face picon face
On 5/9/06, Przemyslaw Lopaciuk <spamBeGonepicspamBeGonespamamusementcity.com> wrote:
> The situation looks like that...
> I've got a board with Intel N80C188. It runs at 24MHz.
> It stores information in NVRAM Dallas DS1225AD-150. So it is CMOS.
> I want to listen to what it is storing in that RAM.
> Boards are connected with ribbon cable. ( BTW do you think that it is a
> good idea to use ribbon cable for that kind of purpose? )

One example where ribbon cable works OK is the fast parallel IDE.
There is no problem if the bust is right terminated (impedance
adapted) on both ends (if it's bidirectional one).
Your problem is not an easy one. It looks like reverse engineering. If
you have full access to the firmware then it's easiest (you may add
loops and check the signal waveform). If you don't have firmware
access then will be very difficult (but not impossible). Without a
logic analyser you could try a good four channel scope and sicronize
it on LSB, WR, RD etc.


> I can only tell that listening to what is going on on that bus is a
> tricky business.

Yaap.

If somebody has some experience with something similar
> I would be very grateful for some knowledge sharing.
>
> Best regards,
> Sam
>
>
>
> {Original Message removed}

2006\05\10@124139 by Dwayne Reid

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face
At 04:29 PM 5/8/2006, Przemyslaw Lopaciuk wrote:
>Speed wouldn't be more than 10MHz.

YIKES!!  That is gonna be expensive, whether you use opto or
capacitive coupling.

>Signals are a bus. It is a bus driven by Intel N80C188.
>
>Regards,
>Sam
>
>{Original Message removed}

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