AVR-Chat

Twisted pair with ground is good. What about diff driver to increase reliability and performance?

Brian

--- In AVR-Chat@yahoogroups.com, "Steve Hodge" <steve@...> wrote:
>
> I would like to use standard shielded Cat 5/6 cable to carry I2C signals
> between boards, i.e., between microcontrollers on separate boards.
> Distances are not the question here, because if they end up a factor I'll
> just use a PCA9517 buffer or something similar, but should someone ask they
> will be of the order of a few to several feet.
> 
> The question is rather what conductors of the four twisted pairs should I
> use?   At first, without thinking about it much I thought just use a single
> twisted pair for both SCL & SDA, but after thinking about it further for a
> few minutes, I now think that might be a bad idea, because SCL & SDA do not
> comprise a single differential signal.
> 
> So now I'm thinking they should be on separate twisted pairs.   Perhaps with
> GND as the other half of each pair.
> 
> I'd appreciate any help on this. 
> 
> Thanks, Steve
>  
> 
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