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TIDA-00483
Dual Sensor Measurement Using Single Current-Loop with FSK Modulation Reference Design
TIDA-00483
Overview
The TIDA-00483 reference design demonstrates a 4-20mA current loop subsystem capable of measuring the surrounding environment and communicating the temperature, humidity, and ambient light over the loop. The small footprint of the design contains all sensors, filters, and control circuitry to calculate and communicate the sensor data. The reference design is intended for process measurement applications in factory automation, field transmitters and building automation. The sensors, MCU and communication modules all run from the current loop power, requiring less than 3.5 mA.
Features
- Reduce cabling and installation cost by transmitting two variable parameters simultaneously on a 4-20mA current loop
- Expandable to additional sensor parameters via FSK-modulated digital data stream
- Dual op-amp 4th order Butterworth filter for FSK generation reduces BOM count
- Ultra Low power MSP430 consumes less of the 3.5 mA budget allowing more current for sensors in the loop
Industrial
- Capacitive Level Transmitter
- Capacitive pressure transmitter
- HVAC valve & actuator control
- Hydrometric Pressure Level Transmitter
- Inductive & capacitive position sensor
- LVDT Position Sensor
- LVDT pressure transmitter
- Optical ToF continuous wave position sensor
- Optical ToF pulse position sensor
- Proximity switch
- Radar / microwave level transmitter
- Resistive pressure transmitter
- System controller
- Temperature transmitter
- Ultrasonic level transmitter
- Ultrasonic position sensor
- Unit controller
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDUAH2.PDF (2208 K)
Reference design overview and verified performance test data
TIDRIL6A.PDF (613 K)
Detailed schematic diagram for design layout and components
TIDRIL7A.PDF (90 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDRIL8.PDF (200 K)
Detailed overview of design layout for component placement
TIDRIM4.ZIP (3187 K)
Files used for 3D models or 2D drawings of IC components
TIDCBC6.ZIP (655 K)
Design file that contains information on physical board layer of design PCB
TIDRIL9.PDF (1901 K)
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
Precision DACs (≤10 MSPS)
DAC161S997 — 16-Bit Precision DAC With Internal Reference and 4mA-to-20mA Current Loop Drive
Data sheet: PDF | HTMLMSP430 microcontrollers
MSP430FR5969 — 16 MHz MCU with 64KB FRAM, 2KB SRAM, AES, 12-bit ADC, comparator, DMA, UART/SPI/I2C, timer
Data sheet: PDF | HTMLStart development
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Dual Sensor Measurement Using Single Current-Loop Design Guide | Aug. 26, 2015 |
Related design resources
Reference designs
REFERENCE DESIGN
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