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 […]
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App note: Interfacing 3V and 5V applications
Another app note from NXP/Phillips Semiconductor on I/O voltage level shifting. Many reasons exist to introduce 3V systems, notably the lower power consumption for mobile applications and the introduction of parts that use technologies with such fine geometries that 5V is simply not allowed any more. The introduction of the 3V standard as supply voltage […]