Field Transmitter with BLE Connectivity Powered from 4 to 20-mA Current Loop Reference Design


Design files


TIDA-00666 enables Bluetooth Low Energy communication powered from a 2-wire 4- to 20-mA loop. For industrial process control instruments, analog 4- to 20-mA current loops are commonly used for analog signaling, with 4 mA representing the lowest end of the range and 20 mA the highest. This reference design measures humidity and temperature and is broadcasting the measured values with Bluetooth Low Energy. TIDA-00666 is loop powered and the current value on the loop is changed according to the humidity value (0% is 4 mA and 100% is 20 mA).

  • 4- to 20-mA loop powered Bluetooth low energy communication
  • 4- to 20-mA current-loop output signal
  • 8-V to 33-V input voltage range
  • 16-bit loop current resolution
  • On-board humidity and temperature sensor
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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.

TIDUC27B.PDF (3037 K)

Reference design overview and verified performance test data

TIDRN24.PDF (607 K)

Detailed schematic diagram for design layout and components

TIDRN25.PDF (76 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRN26.PDF (374 K)

Detailed overview of design layout for component placement

TIDRN28.ZIP (1069 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRN27.PDF (1907 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM51653V-65V, 150mA Synchronous Buck Converter With Ultra-Low IQ

Data sheet: PDF | HTML
Humidity sensors

HDC10802% RH low-power digital relative humidity sensor

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS717150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Low-power 2.4-GHz products

CC2650SimpleLink™ 32-bit Arm Cortex-M3 multiprotocol 2.4 GHz wireless MCU with 128kB Flash

Data sheet: PDF | HTML
Precision DACs (≤10 MSPS)

DAC161S99716-Bit Precision DAC With Internal Reference and 4mA-to-20mA Current Loop Drive

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Field Transmitter With BLE Connectivity Powered From 4 to 20 mA Ref Design (Rev. B) Dec. 12, 2016
Technical article What’s next for Industry 4.0? The best new technologies shaping the future of smar PDF | HTML Nov. 07, 2016
White paper Making factories smarter, more productive through predictive maintenance Nov. 02, 2016
Analog Design Journal Low-EMI buck powers a multivariable sensor transmitter with BLE connectivity Oct. 24, 2016

Related design resources

Software development

BLE-STACK Bluetooth Low Energy software stack

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