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 4 of 64
NXP Semiconductors
UM10204
I
2
C-bus specification and user manual
• Serial, 8-bit oriented, unidirectional data transfers up to 5 Mbit/s in Ultra Fast-mode
• On-chip filtering rejects spikes on the bus data line to preserve data integrity.
• The number of ICs that can be connected to the same bus is limited only by a
maximum bus capacitance. More capacitance may be allowed under some
conditions. Refer to Section 7.2
.
Figure 1
shows an example of I
2
C-bus applications.
2.1 Designer benefits
I
2
C-bus compatible ICs allow a system design to progress rapidly directly from a
functional block diagram to a prototype. Moreover, since they ‘clip’ directly onto the
I
2
C-bus without any additional external interfacing, they allow a prototype system to be
modified or upgraded simply by ‘clipping’ or ‘unclipping’ ICs to or from the bus.
Here are some of the features of I
2
C-bus compatible ICs that are particularly attractive to
designers:
• Functional blocks on the block diagram correspond with the actual ICs; designs
proceed rapidly from block diagram to final schematic.
• No need to design bus interfaces because the I
2
C-bus interface is already integrated
on-chip.
Fig 1. Example of I
2
C-bus applications
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