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PICList Thread
'List Of I2C Links'
1998\01\18@134702 by Charles Laforge

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Hi Guys

I have been researching the I2C bus and protocol in the past few weeks
and have accumulated a few links to interesting sites, which discuss
I2C.  I thought I'd share these with you.  I want to thank everyone who
has helped me by answering my millions of questions.  Here are the
sites.

http://www.philipsmcu.com/i2c.html
www.cdcentre.demon.co.uk/teletext/i2c.htm
www.paranoia.com/~filipg/LINK/ELE/F_I2C.html
http://www.hut.fi/~iisakkil/stuff.html
www.hut.fi/Misc/Electronics/hwprojects.html#i2c_project
kar10.kar.elf.stuba.sk/~balogh/MM/i2c/i2cindex.htm
http://www.cit.ac.nz/smac/i8051/i2c_1.htm
http://www.ping.be/~ping0751/i2c/i2c.htm
http://www.mcc-us.com/techsrc.htm


By the way  I will be posting an updated PIC book list in the very near
future.  If you would like to include your comments on those books
already listed or have new books to contribute please feel free to do
so.


Talk to you guys later!
Charles


   THE ONLY WINNER IN WAR.... IS DEATH!!!

______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com


'List Of I2C Links'
1998\08\17@172833 by David Reinagel
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Andre,
       You are close, but data is always 8 bits.  Look at the below links
for detailed info.

Dave Reinagel


----- Begin Included Message -----

>From spam_OUTowner-piclistTakeThisOuTspamMITVMA.MIT.EDU Sun Jan 18 10:48:00 1998
X-Originating-IP: [142.140.225.27]
Subject:      List Of I2C Links
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU

Hi Guys

I have been researching the I2C bus and protocol in the past few weeks
and have accumulated a few links to interesting sites, which discuss
I2C.  I thought I'd share these with you.  I want to thank everyone who
has helped me by answering my millions of questions.  Here are the
sites.

http://www.philipsmcu.com/i2c.html
www.cdcentre.demon.co.uk/teletext/i2c.htm
www.paranoia.com/~filipg/LINK/ELE/F_I2C.html
http://www.hut.fi/~iisakkil/stuff.html
www.hut.fi/Misc/Electronics/hwprojects.html#i2c_project
kar10.kar.elf.stuba.sk/~balogh/MM/i2c/i2cindex.htm
http://www.cit.ac.nz/smac/i8051/i2c_1.htm
http://www.ping.be/~ping0751/i2c/i2c.htm
http://www.mcc-us.com/techsrc.htm


By the way  I will be posting an updated PIC book list in the very near
future.  If you would like to include your comments on those books
already listed or have new books to contribute please feel free to do
so.


Talk to you guys later!
Charles


   THE ONLY WINNER IN WAR.... IS DEATH!!!

______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com


----- End Included Message -----

1998\08\17@180001 by Ryan Pogge

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face
LM 75  temp sensor is 9 bits.



>Andre,
>        You are close, but data is always 8 bits.  Look at the below links
>for detailed info.
>
>Dave Reinagel

1998\08\17@182323 by David Reinagel

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{Quote hidden}

It is true that the LM75 has 9 bits, but it communicates this as 2 bytes,
not as 9 bits.  See their web site:

http://www.national.com/ds/LM/LM75.pdf   pages 9 and 10


Dave Reinagel
Cisco Systems, Inc.

1998\08\18@035255 by Thomas Magin

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At 18:00 17.08.98 -0400, you wrote:
>LM 75  temp sensor is 9 bits.

But you need two read cycles for getting the complete 9 Bits ! Anyway, the
dataword consists of 8 Bits per cycle.

Thomas
=8-)

--

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1998\08\19@000931 by Ryan Pogge

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maybee you could help me with a problem I am haveing.. If so email me of the
list
@spam@poggeKILLspamspamshore.intercom.net
basicly Im only getting the 9th bit and I dont know why.  all I get on my
LCD is 0's and 5's
this is the 9th bit ... if the 9th bit is 1 it sends a 5 and if the 9th bit
is 0 it sends a 0, after the decimal.

except all I get is the 0 or 5...  if anyone wants to take look and see if
they see the problem  gime a shout...
thanks,
Ryan


{Original Message removed}

1998\08\19@054439 by Thomas Magin

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At 00:02 19.08.98 -0400, you wrote:

Hi,

>basicly Im only getting the 9th bit and I dont know why.  all I get on my
>LCD is 0's and 5's
>this is the 9th bit ... if the 9th bit is 1 it sends a 5 and if the 9th bit
>is 0 it sends a 0, after the decimal.
>

it seems that you access the LM75 with two readcycles but divided by a
stop/start-condition.

For getting the full 9Bits you need two consecutive readcycles ! Have a look
at the datasheet.

Hope that helps

Thomas
=8-)

--

**********************************************************
* Thomas Magin                  FON:   ++49-761-4543-489 *
* marquette-Hellige GmbH        FAX:                -507 *
* E-FW / Emergency Systems      email: KILLspammaginKILLspamspamhellige.de  *
* Munzinger Str. 3                                       *
* D-79111 Freiburg / Germany                             *
**********************************************************

1998\08\19@110723 by pogge

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face
> it seems that you access the LM75 with two readcycles but divided by a
> stop/start-condition.

ahh so it must be consecutive.

> For getting the full 9Bits you need two consecutive readcycles ! Have a look
> at the datasheet.

it helps a little :)

> Hope that helps
>
> Thomas
> =8-)
>
> --

1998\08\19@143923 by pogge

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face
Quote:

"No. When the master send the address the slave (LM75) gives the ACK
bit. When the master get the ACK bit reads 8 bits from the slave.
After the 8 bits the master send the ACK bit to the slave and
continues to reading the next 8 bits. When the master readas the
second 8 bits send the stop condition to the slave."

This is what the creator of the code said... I will not say his name,
if he wants to say anything he will.
I dont realy know enough to argue one way or the other.

he belives that I do not give enought time to the LCD  between the high
and low byte.
There is a line in the program in the serial routin.

   CALL serout
   call delay

delay is #10h i think.
could this be the problem?  I am sending from a PIC16F84 to
a PIC-an-LCD at 2,400 baud. it is inverted 1,n,8

any genneral considerations I should think about?

any Ideas why im only getting bit 9 on the LCD and
not the first 8 bits?  is this probably a timeing issue as he suggests.


thanks.
Ryan



> it seems that you access the LM75 with two readcycles but divided by a
> stop/start-condition.
>
> For getting the full 9Bits you need two consecutive readcycles ! Have a look
> at the datasheet.
>
> Hope that helps

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