The advantages and ease of use
of an I²C link are well known.
Since its introduction almost 20
years ago, it has been applied in
more than 1000 types of IC. All
these ICs are designed for operation
from a 5 V power supply.
However, more and more ICs
coming on to the market use a
3.3 V supply.
The bi-directional
shifter described in this application
note is intended to interconnect
two sections of an
I²C-bus system, each section
with a different supply voltage
and different logic levels
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