The solution to solve this issue is by connection a discrete MOSFET to each bus line. a level shifter must also be bidirectional, without the need of a direction control signal. This devices are mostly running on Level Shifting required for i2C communication protocol most popular for this required is using FET AN10441 designed by NXP this device works with high voltage upt to 10v to 1.8v down. Logic Level shifting may require when interfacing legacy devices that use geometry process. Other micro-controller uses 5v as standard input voltage, many latest device modules, popular sensors, GPS, RF modules, Flash Memories, SPI storage, Display, use 3 to 3.3v most of this devices requires logic level conversion to protect them from high voltage signals.
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