On May 16 2014 11:26 PM, Marius Liebenberg wrote: > On 2014-05-17 01:43, EBo wrote: >> On May 16 2014 11:14 AM, Gene Heskett wrote: >>> On Friday 16 May 2014 12:15:06 Marius Liebenberg did opine >>> And Gene did reply: >>>> Look under the High Speed Mode - up to 3.4Mb/sec >>>> >>>> >>>> http://www.esacademy.com/en/library/technical-articles-and-documents/mi >>>> scellaneous/i2c-bus.html >>>> >>> Thank you Marius. But nowhere in that link is any mention of using >>> differential pair cabling, its all single ended all the way down. >>> There >>> may be chips that can convert it to cat5 differential pair's and >>> back. I >>> haven't researched it. Needing to tristate them when not busy >>> complicates >>> it. >> Isn't it possible to just tie the twisted pair to a single pin (for >> noise cancellation)? I worked with something in the past that I >> remember as having that arrangement. Then you would not have to >> have >> logic for each line, but each pin. I can see the benefit of adding >> isolation logic between the pins and cable thought... >> >> EBo -- > > Not worth all the effort. I2c is not really meant for long distance > communications but rather a protocol that is applied on the same > circuit > board or close proximity boards. It is an high speed inter device > protocol that useses very little hardware resources (pins). My goal > is > to provide an expansion bus that can hook up several functions that > are > commonly desired by machine builders making use of just the parport. > Things like AtoD for plasma, IO expander, pwm to analog. Mostly non > mission critical stuff.
Fair enough on the port buffer, but tieing two wires together to reduce EMF induced current seems trivial -- although I have no idea how far that would add to the line caring capacity. EBo -- ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
