This reference design gives an example implementation of a 4–20mA interface for 2-wire loop-powered sensors. The design enables evaluation of the AFE881H1 and AFE882H1 in a lower power application-like environment with a 1.8V signal chain. The AFE881H1 and AFE882H1 integrate a high-precision 16-bit digital-to-analog converter (DAC) and a HART® modem. The reference design provides a serial peripheral interface (SPI) and universal asynchronous receiver-transmitter (UART) interface on a pin header to connect to a microcontroller (MCU). This pin header provides 3.3V and 1.8V to power a MCU and a 1.25V reference voltage to be used for an analog-to-digital converter (ADC).
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
Detailed overview of design layout for component placement
Complete listing of design components, reference designators, and manufacturers/part numbers
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Detailed schematic diagram for design layout and components
Includes TI products in the design and potential alternatives.
Initial Release
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Field Transmitter Platform: 4mA to 20mA Loop-Powered Interface Reference Design (Rev. A) | PDF | HTML | Jan 12, 2026 |
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