旧设备逻辑电平转换接口时可能需要使用较小的几何尺寸工艺新设备。对于像I2C总线的双向总线系统，如电平转换器也必须是双向的，无需方向控制信号的需要。最简单的方式来解决这个问题是每个总线连接一个独立的MOS场效应管。 AN10441
Level shifting techniques in I2C-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 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.
NXP Semiconductors ……
