App note: Level shifting techniques in I2C-bus design


Level shifting techniques in I2C-bus design from NXP, app note here (PDF):

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 I2C-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.

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