MSP430 datasheet(72/88 Pages) TI

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8.2 Typical Application

This design example shows a loop-powered, 4-mA to 20-mA field transmitter featuring the AFE88101. The

AFE78101 can also be used in this design for lower-resolution applications.

This design example combines several circuit elements to create a subsystem that can support most field

sensors in two-wire, current-loop applications. The design accepts bus voltages from 12 V to 36 V, while

regulating the loop-current representation of a sensor to a post-calibration accuracy of less than 0.1% full-scale

range (FSR) of total error at room temperature. The high integration in the system allows for a compact circuit,

making this device an excellent choice for field transmitters where space is a concern. In field-transmitter

applications, the current-loop transmitter, microcontroller, sensors, and analog front end are all required to

consume less than the minimum bus current of 3 mA. Use an integrated DC/DC converter in the system to

extend the current budget and allow more current for sensors and the AFE.

Figure 8-2 shows the schematic diagram for the loop-powered, 4-mA to 20-mA field transmitter.

AFE78101, AFE88101

SLASF21 – DECEMBER 2022

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Product Folder Links: AFE78101 AFE88101

MSP430 Datasheet(PDF) 72 Page - Texas Instruments