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App note from Maxim Integrated on their parasitically powered digital input interface chip which is used favorably on industrial applications. [via]
A digital input (DI) is a circuit designed to receive a binary signal transmitted from an industrial sensor and translate that input into a reliable logic signal for a programmable logic controller (PLC) or industrial controller. Common examples of industrial binary signals are pushbuttons and/or temperature or proximity threshold indicators. The MAX22191 parasitically powered DI circuit can monitor Type 1 and Type 3 sink and source binary input signals for PLC and industrial circuits.
Industrial digital inputs with the MAX22191 – [Link]
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