UM10204 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 5 — 9 October 2012 2 of 64
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NXP Semiconductors
UM10204
I
2
C-bus specification and user manual
Revision history
Rev Date Description
v.5 20121009 User manual; fifth release
Modifications: • Section 3.1.7 “Clock synchronization”, first paragraph, first sentence changed from “idle bus”
to “free bus”
• Section 3.1.8 “Arbitration”, third paragraph, second sentence changed from “the bus is idle”
to “the bus is free”
• Section 3.1.12 “Reserved addresses”:
– Table 3 “Reserved addresses”, slave address 1111 1XX: R/W bit changed from “X” to “1”;
description changed from “reserved for future purposes” to “device ID”
– deleted (old) third paragraph
• Section 3.1.17 “Device ID”:
– in numbered list following second paragraph: “START command” changed to “START
condition”
– in numbered list following second paragraph: “STOP command” changed to “STOP condition”
– in Remark paragraph: “NACK command” changed to “NACK”
– Table 4 “
Assigned manufacturer IDs” updated
• Section 3.2.8 “10-bit addressing”:
– fifth paragraph (bullet item): “NA1” changed to “W
” in third sentence; deleted “(NA2)” from
fourth sentence
– Figure 29 “A master-transmitter addresses a slave-receiver with a 10-bit address” modified
• Section 3.2.9 “Reserved addresses in UFm”: deleted (old) third paragraph
• Section 7.2.1 “Reduced f
SCL
”, third paragraph corrected from “30 % to 30 %, or 70 % to 70 %”
to “30 % to 70 %, or 70 % to 30 %”
v.4 20120213 User manual Rev. 4
v.3 20070619 Many of today’s applications require longer buses and/or faster speeds. Fast-mode Plus was
introduced to meet this need by increasing drive strength by as much as 10× and increasing the data
rate to 1 Mbit/s while maintaining downward compatibility to Fast-mode and Standard-mode speeds
and software commands.
v2.1 2000 Version 2.1 of the I
2
C-bus specification
v2.0 1998 The I
2
C-bus has become a de facto world standard that is now implemented in over 1000 different ICs
and licensed to more than 50 companies. Many of today’s applications, however, require higher bus
speeds and lower supply voltages. This updated version of the I
2
C-bus specification meets those
requirements.
v1.0 1992 Version 1.0 of the I
2
C-bus specification
Original 1982 first release
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