Dual Sensor Measurement Using Single Current-Loop with FSK Modulation Reference Design

(ACTIVE) TIDA-00483

Description & Features

Technical Documents

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Key Document

Description

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

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  




TI Devices (7)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DAC161S997  SPI 16-bit Precision DAC for 4-20mA Loops  Digital-to-Analog Converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
HDC1000  Low Power, 3% Accuracy Digital Humidity Sensor with Integrated Temperature Sensor  Sensing Products  Sample & Buy View Design Kits & Evaluation Modules
HDC1010  HDC1010 Low Power, High Accuracy Digital Humidity Sensor with Temperature Sensor  Sensing Products  Sample & Buy View Design Kits & Evaluation Modules
LMV342  Dual Rail-To-Rail Output CMOS Operational Amplifier with Shutdown  Operational Amplifiers (Op Amps)  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR5969  MSP430FR5969 16 MHz Ultra-Low-Power Microcontroller featuring 64 KB FRAM, 2 KB SRAM, 40 IO  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
OPT3001  Digital Ambient Light Sensor (ALS) with High Precision Human Eye Response   Optical Sensors  Sample & Buy View Design Kits & Evaluation Modules
TPS7A4001  100V Input, 50mA, Single Output Low-Dropout Linear Regulator  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 2208 26 Aug 2015 1,328
Design files (6)
Title Abstract Type Size (KB) Date Views
PDF 613 24 May 2016 103
PDF 90 24 May 2016 6
ZIP 3187 03 Nov 2015 14
ZIP 655 02 Nov 2015 105
PDF 1901 02 Nov 2015 6
PDF 200 02 Nov 2015 7
Related Tools & Software

Reference Designs (1)

Name Part Number Tool Type
RTD Temperature Transmitter for 2-wire, 4 to 20-mA Current Loop Systems  TIDA-00095  TI Designs

Software (1)




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