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'Dallas 1990A'
1997\03\07@082039 by r.hannema

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Mostly I hate Novices but this time, I am one.....

Does anyone know something about the Dallas Touch Memory parts.
It's a kind of battery-like 64-bit memory cell, with a 1-wire protocol.

YES, only one wire to read the contents of this unique-serial number memory.

The only problem is that the TIMING is very difficult.

Can anybody help me ?
Is te DS2404 interface chip something to use ???
Is PIC-BASIC to slow to programm in ??

NB a very interessting site: http://www.iButton.com/iButtons/index.html
really great and the parts are very cheap, only the software......

Remko

1997\03\07@113448 by Antti Lukats

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At 01:32 PM 7/3/97 +0000, you wrote:
>Mostly I hate Novices but this time, I am one.....
>
>Does anyone know something about the Dallas Touch Memory parts.
>It's a kind of battery-like 64-bit memory cell, with a 1-wire protocol.
>
>YES, only one wire to read the contents of this unique-serial number memory.
>
>The only problem is that the TIMING is very difficult.

Nop once you have the low lever functions there are no problems,
in the matter of fact its very easy for PIC and not so easy for PC :)

The code for Dallas 1-Wire is available, look at the common PIC
pointers on the net and you find it,

>Can anybody help me ?
>Is te DS2404 interface chip something to use ???
no need to use any ionterface chip, on PIC and pullup (optional
protection) is enough
>Is PIC-BASIC to slow to programm in ??

Which one? Stamps are too slow by himself but there is a
simple add on hardware for 1-wire to stamp interface.

Other PIC basic variants should be fast enough. (Compilers)
So MEL  Basic Compiler asd FED Compiler (A pseudo compiler
actually) should do it.

>NB a very interessting site: http://www.iButton.com/iButtons/index.html
>really great and the parts are very cheap, only the software......
>
>Remko
>
>

-- Silicon Studio Ltd.
-- http://www.sistudio.com

1997\03\07@125838 by Karoly Hoss

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part 0 830 bytes
bye
charley

ps drop me a line if you experience ANY difficulties

spam_OUTr.hannemaTakeThisOuTspamcastel.nl wrote:
{Quote hidden}

Attachment converted: wonderlandfive:zipped.zip (pZIP/pZIP) (0000CB54)

1997\03\07@224909 by lmclaren

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r.hannema@castel.nl wrote:
>
> Mostly I hate Novices but this time, I am one.....
>
> Does anyone know something about the Dallas Touch Memory parts.
> It's a kind of battery-like 64-bit memory cell, with a 1-wire protocol.
>
> YES, only one wire to read the contents of this unique-serial number memory.
>
> The only problem is that the TIMING is very difficult.
>
> Can anybody help me ?
> Is te DS2404 interface chip something to use ???
> Is PIC-BASIC to slow to programm in ??
>
> NB a very interessting site: http://www.iButton.com/iButtons/index.html
> really great and the parts are very cheap, only the software......
>
> Remko

Gday Remko,
I have done a lot of work with the dallas chips on pic and hc11.
The timing is straight forward and works well.
You will need to do some setting and checking at 8uS intervals so basic
may not be the way to go.
Get hold of the "Touch Memory Standards" book from dallas, it explains
is well.
Regards
--
Lee McLaren                          .....lmclarenKILLspamspam@spam@trumpet.com.au
Comstra pty. ltd.                    lmclarenspamKILLspamcomstra.com.au
2 Kirksway place                     phone       03 62244488
Hobart Tasmania                      fax         03 62244601
Australia 7000                       mobil       018 138682

'It was five hours of Boggs's "channelling". After three hours
I asked him to summon up the soul of Jimi Hendrix and requested
All Along the Watchtower. You know, the guy's been dead
twenty years but he still hasn't lost his edge'
Mulder

1997\03\16@010429 by Brian C. Lane

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On Fri, 7 Mar 1997, Antti Lukats wrote:

> >Does anyone know something about the Dallas Touch Memory parts.
> >It's a kind of battery-like 64-bit memory cell, with a 1-wire protocol.
> >
> >YES, only one wire to read the contents of this unique-serial number memory.
> >
> >The only problem is that the TIMING is very difficult.
>
> Nop once you have the low lever functions there are no problems,
> in the matter of fact its very easy for PIC and not so easy for PC :)

 I used to think so too, until I read App note #74 from Dallas.  OneWire
protocol can be done using the PC's serial port at 115.2k for
communications and ~10k for the reset signal. See my webpage for more
info.

 Brian

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1997\03\16@191107 by Karoly Hoss

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If anybody needs ds1990a routines
for pic 16c84 at 4mhz
with one pullup resistor

drop me a line


bye
charley

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