----- Original Message -----
From: "ashly Dearden" <ashdearden@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, December 21, 2001 3:35 PM
Subject: [EE]: grounding shields on cables


> If you have an I2C master talking over a few feet of RJ45 type cable
(telco
> type cable) to a slave, what side ought to be grounded? both? digital
> ground? AC ground?  I'm thinkin digital ground on the master connector
only.
>
> comments?


You obviously need a signal ground along with the two I2C wires, so the
slave and the master will be grounded that way. If you mean earth ground
then either one is OK, or both: a distance of a few feet will not introduce
huge ground currents.
/\/\/\/*=Martin

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