> Date: Tue, 15 Nov 2011 16:24:34 -0800
> From: picdude3@narwani.org
> To: piclist@mit.edu
> Subject: [EE] I2C over Cat 5/6 conductor layout
>=20
> Hi all,
>=20
> I'm planning on using standard unshielded (for now) Cat5/5e patch =20
> cables to run I2C signals and power between 2 boxes, over a length =20
> ~15ft.  Looking for thoughts on how best to organize the wires in the =20
> cable to minimize noise effects.  Of the 8 conductors, 2 will be =20
> power, 2 ground, one SDA, one SCL, one other signal.
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> Since these are set up as 4 pair(s), would it make a difference if I =20
> run the SDA/SCL signals on one pair, or should I split up the SDA with =20
> one ground, SCL with another, etc?
>=20
> Cheers,
> -Neil.

Most I2C drivers won't like the capacitance of those lines.  However, there=
 is an I2C bridge/buffer from Philips - P82B715 I believe - that will work =
with longer runs and higher capacitance.
Double check the part number, I pulled that from memory so it might not be =
right. =20
As to pairing up the lines look over this app note : http://www.nxp.com/doc=
uments/application_note/AN10658.pdf
Rob
 		 	   		 =20
--=20
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