![]() Over the recent years, the three most common voltage levels amongst transistor-transistor logic (TTL) devices are 1.8V, 3.3V, and 5V. ![]() Level shifting, in its simplest terms, is a technique that allows compatibility between two systems of different operating voltages. This application note discusses the fundamental technique to "shift" between two voltages and how to apply it to a 1-Wire ® system using two kinds of level shifters: the discrete level shifter and the IC level shifter. This can be accomplished by using level shifting. Because of this, it is important to convert the output voltage of one device to match the input voltage of another. But, depending on its maximum tolerance, connecting a 5V microcontroller to a 1-Wire device operating at 3.3V can be harmful to the device or the other way around. ![]() There are times when a 5V system needs to implement peripherals that operate at voltage ranges other than at 5V. Unfortunately, that is not always desirable. Ideally, it is best to always connect two devices of equal operating voltages. Introductionĭigital devices operate on a range of different voltages. This application note explains how to integrate a 1-Wire ® slave device into any system, regardless of its operating voltage, using level shifting. Unless the right measurements are taken, integrating systems with different operating voltages can be problematic. Some systems are designed to operate in higher voltages than others.
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