ZSC31010 / ZSC31015 Application Note - Analog 4-to -20mA Current Loop Output Applications
●Introduction:
■This document outlines the 4-to-20mA current loop output application for the ZSC31010/ZSC31015 SSC ICs, which are designed to interface with a resistor bridge sensor in a 3-wire sensor module. During normal operation, the Sig™/OUT pin outputs the corrected sensor reading as analog 5V ratiometric, 0 to 1V, or digital output. (Dur-ing calibration/configuration, this pin acts as a bi-directional serial data channel.) The current loop output, a com-mon robust analog output in industrial applications, was not originally supported by the ZSC31010/ZSC31015 as it is for the ZSC31050, which integrates a regulation loop that senses the actual current and regulates the output current to the calibrated target value.
■Calibrating the ZSC31010/ZSC31015 for a current loop output application requires a different method of starting the Command Mode (CM) for communication. The command to enter CM must be sent within the command window, which is the first 5ms after power up for the ZSC31010 or the first 3ms for the ZSC31015. Meeting the command window requirements is especially complicated with a current loop application, particularly for the ZSC31015. The recommended method is to send the “Start CM” command before turning on the current loop voltage supply. This procedure is an exception to standard procedures: even if the absolute maximum ratings given in the data sheet are not observed, it will not harm the IC because there is no significant power consump-tion via the communication lines. If the master communicates via a push-pull stage, no pull-up resistor is needed; otherwise, a pull-up resistor with a value of at least 150Ω must be connected.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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April 19, 2016 |
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482 KB |
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