![]() ![]() During the next 20 years, the changes in isolation technology were largely incremental until 2000, when the first of the new chip scale digital isolators were introduced. The capabilities of optical isolation shaped many of the properties for these communications buses due to the limits of the isolation devices. These shaped the development of communications standards such as RS-232, RS-485 and industrial busses like 4 to 20mA current loops and DeviceNet and PROFIBUS ®. In the 1970s there was a proliferation of optoelectronic devices. They allowed feedback in power supply control circuits, signal isolation in communications to break ground loops, and communications to high side power transistors or current monitors. The advent of the modern optocoupler about 45 years ago was a great step forward for designers. We will also explore several applications that can benefit from this new class of devices. In this article, we will examine the latest developments in ultralow power isolation, how it relates to the available technologies, and how it has been achieved. Old technology optocouplers and even many newer digital isolators consume so much power that certain types of applications have not been practical. It is a burden because it limits communication speed and consumes a lot of power and board space. It is necessary because it makes electronics safe for anyone to use. Isolation has long been considered a necessary burden by designers. Ultralow Power Opening Applications to High Speed Isolation
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