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'[PICLIST] [PIC}: I2C Questions'
2002\02\27@102005 by Sean Alcorn - Avion Sydney

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Hi all,

I am a relative newbie, and am designing a series of products based on the
PIC16F87X and possibly the PIC16F628 that will all need to communicate with
each other (multi Master) over distances of up to say 50m.

Is I2C a suitable choice? Can I run the PICs as slow as 4MHz, or would I
need to go higher than this? I plan to send simple commands and
acknowledgements only.

Also what is a "Controller Area Network"

Sorry if these are silly questions.

Regards,

Sean

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2002\02\27@104021 by Spehro Pefhany

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At 02:17 AM 2/28/02 +1100, you wrote:
>Hi all,
>
>I am a relative newbie, and am designing a series of products based on the
>PIC16F87X and possibly the PIC16F628 that will all need to communicate with
>each other (multi Master) over distances of up to say 50m.
>
>Is I2C a suitable choice?

No. It is intended for very short distances. You want, at a minimum, RS-485,
for which you can use the on-board UART in those chips. I prefer isolation
(optical or transformer) for noisy environments.

>Can I run the PICs as slow as 4MHz, or would I
>need to go higher than this? I plan to send simple commands and
>acknowledgements only.

4MHz should be fine as far as comms are concerned.

>Also what is a "Controller Area Network"

CAN is a relatively simple network used in automobiles and similar situations.
It's also part of the industrial standard Devicenet. Do a web search and
you can find lots of information on it.

Here's a presentation that should get you up to speed:
http://www.ece.cmu.edu/~ece540/lecture/09_can.pdf

>Sorry if these are silly questions.

The only silly question is one that should have been asked but, wasn't.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
9/11 United we Stand

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2002\02\27@143859 by uter van ooijen & floortje hanneman

picon face
> I am a relative newbie, and am designing a series of products based on the
> PIC16F87X and possibly the PIC16F628 that will all need to communicate
with
> each other (multi Master) over distances of up to say 50m.
>
> Is I2C a suitable choice? Can I run the PICs as slow as 4MHz, or would I
> need to go higher than this? I plan to send simple commands and
> acknowledgements only.

I would never use i2c over that distance. Why not use rs485?

Wouter van Ooijen
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Jal compiler, Wisp programmer, WLoader bootloader, PICs kopen

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2002\02\28@043046 by Thet Naing Kyaw

picon face
USART port will be one option.

Rgds,
Thet Naing

--- wouter van ooijen & floortje hanneman
<.....wfKILLspamspam@spam@XS4ALL.NL> wrote:
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