Talk:I²C

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[edit] Nonsense

"Buses of this type became popular when ??? realized that much of the expense of an integrated circuit results from the size of the package and the number of pins." There's a noun missing in this sentence, and I'm not sure what it's supposed to be --Jsnow 21:27, 6 May 2005 (UTC)

Some anon deleted the word "engineers". - Omegatron 21:54, May 6, 2005 (UTC)
If much of the cost of an IC is really the packaging why do even the lowest pin count pics cost far more than basic logic chips? Plugwash 23:44, 7 October 2006 (UTC)
Maybe they don't mean the cost of chip manufacturing, but the cost of using it on a PCB? Large size, etc. — Omegatron 02:11, 8 October 2006 (UTC)

Would it not be better to say "clock frequencies down to 0Hz" rather than "down to DC"? It may be the same thing, but DC is not usually used to refer to clock frequency. —Preceding unsigned comment added by 146.232.75.208 (talk) 13:19, 5 April 2008 (UTC)

[edit] Patents

Haven't the two patents cited both lapsed? --Ian 12:28, 15 Jun 2005 (UTC)

I don't think so. But if you read the specifications [1], a license is automatically granted to anyone purchasing I2C components from Philips. -- RevRagnarok Talk Contrib Reverts 16:22, 3 June 2006 (UTC)

[edit] Synonyms

I'm not sure how to do it but could someone else edit the page so that if "2-wire serial" or similar is searched for then this page comes up? FzerozeroT 21:25, 14 November 2006 (UTC)

I think it can be done, whilst another 2-wire interface wouldn't be presented (then 2-wire serial, 2-wire redirects should be replaced by disambig). --Yuriy Lapitskiy 06:20, 15 November 2006 (UTC)

The same should be the case for TWI (Two Wire Interface) which some uC makers prefer to call the famliy of busses. 81.215.13.145 13:05, 19 February 2007 (UTC)

[edit] Pronounciation

Is there a reference which says "eye-too-see" is incorrect prounouciation? --Cowbert 22:55, 27 December 2006 (UTC)

How about the converse: can you find a source that says it is correct? Everywhere I look it says "squared" not "two". If there is no de jure pronunciation then the de facto pronunciation is eye-squared-see; I have never heard it said eye-two-see for that matter. Cburnett 23:47, 27 December 2006 (UTC)
Fine, but the article asserts that "I-two-C" is incorrect. The burden of proof for actually making an assertion is higher than observing an absence of proof to the contrary. I have no problem with the article stating that "eye-squared-see" is the de-facto pronounciation; anon_user back on 29 Nov 2006 added the "also, incorrectly..." clause, without a reference. --Cowbert 01:18, 29 December 2006 (UTC)
Except eye-two-see is incorrect pronunciation by the mere fact that virtually no one says it. Do a google search to see my point. "eye-two-see" gets 1 hit. "I-squared-C" gets 582 hits. "I-two-C" gets 4 hits. When something is widely true, so true that no source is going to assert it then you can't source it. You're not going to find a source saying that "bob" is pronounced "pop" (a bit hyperbolic, perhaps, but illustrates my point). I do welcome any suggestions on how to deal with this. If it has to be reworded to be less authoritative, then so be it. At the end of the day "eye-two-see" is incorrect though... Cburnett 01:41, 29 December 2006 (UTC)
As a counterpoint, I would wager that most anyone assuming the I-two-C pronunciation would not explicitely spell out the pronunciation on a webpage. After all, it is commonly spelled "I2C", not "I^2C" or "I²C" when not typeset. You only need to say "I-squared-C" when arguing that is is pronounced differently than it looks. I would still like to see an authoritative source that I-two-C is absolutely incorrect. The superset two doesn't mean a lot, since it has been used in other electronics (e.g. Odyssey²) to mean "two". I have indeed heard it it called I-two-C in electronics labs before. --141.212.106.126
While Phillips engineers pronounce it "eye-squared-see", many end users do indeed pronounce it "eye-two-see", regardless of Google hits (I work for a company that specializes in I2C). AFAIK Phillips does not specify the correct pronunciation - but when you consider that the only reason the pronunciation of "eye-two-see" abounds is because of the difficulty of printing the "squared" symbol and ignorance that it is indeed a "squared" and not a "two", I think it's fair to say that "eye-too-see" is incorrect. Phillips won't take away your slave address license for saying "eye-two-see" :) but they will repeat it back to you as "eye-squared-see". --Intx13 21:57, 31 July 2007 (UTC)

[edit] confused sentence

"I²C supports a limited range of speeds. At the high end, insufficient bandwidth may be available, while at the low end can cause problems..."

Insufficient bandwidth may be available? Does that mean:

  1. "Sufficient bandwidth may not be available" OR
  2. "Sufficient bandwidth may be available"

???? Fresheneesz 07:57, 4 August 2007 (UTC)

Yeah that was crappy. Should be fixed now. 69.226.208.120 04:56, 23 September 2007 (UTC)

[edit] Proposal: Addition of I2C-RAM

Also I2C-RAMs are available, for instance the PCF8570 (Philips). It is helpful for communication between processors or controllers. —Preceding unsigned comment added by 80.156.43.1 (talk) 17:29, 30 October 2007 (UTC)

[edit] Basic values

It should be noted somewhere the default values for circuits - for example, the Rp is usually 4.7 kohms