AN10441
Level shifting techniques in I
2
C-bus design
Rev. 01 — 18 June 2007 Application note
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Keywords I2C-bus, level shifting
Abstract Logic level shifting may be required when interfacing legacy devices with
newer devices that use a smaller geometry process. For bidirectional bus
systems like the I
2
C-bus, such a level shifter must also be bidirectional,
without the need of a direction control signal. The simplest way to solve
this problem is by connecting a discrete MOS-FET to each bus line.
