Design

What are isolated digital inputs?

24th September 2019
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Digital isolators serve the basic (or often reinforced!) function of providing galvanic isolation digital signal paths. TI isolation structures are capacitive, with the insulation barrier consisting of two high-voltage capacitors built from our complementary metal-oxide semiconductor (CMOS) process technology.

A high-frequency carrier communicates across the isolation barrier from the primary side to the secondary side, and our digital isolators are capable of withstanding up to 12.8 kV of applied surge voltage and 1.5kV of working voltage without breaking down the double capacitive barrier. A key component of digital isolators is the isolation rating of basic or reinforced.

Isolated digital inputs serve the basic (yes, basic!) function of providing galvanic isolation from a sensor input or other input type to a logic output for a host controller interface.

Unlike digital isolators, the input stage of an isolated digital input includes a user-set input threshold and integrated current limit that allows input voltages ranging from nine to 60V to be translated to a logic output. In its simplest form, isolated digital inputs operate as isolated comparators, with some great added features for ease of design.

To learn more, click here.

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