Wireless pH Sensor Transmitter (DevPack for SensorTag) Reference Design


Design files


TIDA-00561 shows how to build an industrial-grade wireless pH transmitter for process control. This reference design includes a designed pH front-end which can be connected directly via its onboard connector to most pH probes used in process control. The performance data was tested and characterized (input range 0 to 14 pH, overall tested accuracy +/- 0.01 pH) to ensure compatibility with process instrumentation needs.

Because TIDA-00561 form factor and electrical connections are compatible with the TI SimpleLink™ CC2650 SensorTag ecosystem, a simple firmware update is enough to select the wireless connectivity technology: Bluetooth® Smart, ZigBee® or 6LoWPAN, among others. The firmware used for testing and characterization is Bluetooth Smart, which has the highest presence ratio in portable equipment, making testing and demonstration easier. Once you select the wireless technology for your industrial wireless network, you can start collecting data with the associated gateway, which then allows you to run analytics either on a PC or directly on the Sitara-powered BeagleBone Black.

  • Isolated (wireless) pH sensor transmitter
  • BLE interface
  • pH-input bias current <7 pA
  • Less than 200 µA in advertising mode
  • Include PT100 for temperature compensation
  • pH range: 0 to 14
  • Accuracy: @ 25°C ±0.01 pH
  • Repeatability: @ 25°C ±0.01 pH
  • Temperature range: -40°C to +125°C
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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.

TIDUA47B.PDF (910 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement


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


Includes TI products in the design and potential alternatives.

Signal conditioners

LMP91200Integrated AFE for Low-Power pH Sensing Applications

Data sheet: PDF
Analog switches & muxes

TS5A31591-Ω on-state resistance, 5-V, 2:1 (SPDT), 1-channel analog switch

Data sheet: PDF | HTML
Precision ADCs

ADS112016-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & SPI interface

Data sheet: PDF | HTML
Series voltage references

REF32202.048 4ppm/°C, 100-µA, 6-pin SOT-23 series (bandgap) voltage reference

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide Wireless pH Sensor Transmitter (DevPack for SensorTag) Design Guide (Rev. B) Jun. 03, 2016
White paper Cities grow smarter through innovative semiconductor technologies Jul. 07, 2017
White paper Making factories smarter, more productive through predictive maintenance Nov. 02, 2016
Technical article What can we learn for IIoT from the man who invented the Web? PDF | HTML Jan. 12, 2016

Related design resources

Hardware development

CC2650STK SimpleLink™ Bluetooth low energy/Multi-standard SensorTag

Reference designs

TIDA-00246 Generic Energy Harvesting Adapter Module for Thermoelectric Generators (TEG) Reference Design TIDC-CC2650STK-SENSORTAG SimpleLink™ multi-standard CC2650 SensorTag™ kit reference design

Support & training

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