Wireless pH Sensor Transmitter (DevPack for SensorTag) Reference Design
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Key Document


The TIDA-00561 shows how to build an industrial-grade wireless pH transmitter for process control.

This TI 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 +/- 0.01pH) 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 <7pA
  • Less than 200µA in advertising mode
  • Include PT100 for temp compensation
  • pH range: 0 to 14
  • Accuracy: @ 25°C ±0.01 pH
  • Repeatability: @ 25°C ±0.01 pH
  • Temp Range: -40 to +125C

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Schematic/Block Diagram

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Design Files

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1120  16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & SPI interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
LMP91200  Integrated AFE for Low-Power pH Sensing Applications  Specialty sensors  Sample & Buy View Design Kits & Evaluation Modules
REF3220  2.048 4ppm/°C, 100-µA, 6-pin SOT-23 series (bandgap) voltage reference  Voltage references  Sample & Buy Not Available
TS5A3159  1-Ω on-state resistance, 5-V, 2:1 (SPDT), 1-channel analog switch  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1120 Download Download
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LMP91200 Download Download
REF3220 Download Download
TS5A3159 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 910 03 Jun 2016
White paper (2)
Title Type Size (KB) Date
PDF 3648 07 Jul 2017
PDF 1774 02 Nov 2016
Design files (6)
Title Type Size (KB) Date
ZIP 208 18 Jun 2015
ZIP 504 18 Jun 2015
PDF 630 18 Jun 2015
PDF 116 18 Jun 2015
PDF 84 18 Jun 2015
PDF 295 18 Jun 2015
Related Tools & Software

Reference Designs (2)

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

Hardware development (1)

Name Part Number Tool Type
SimpleLink™ Bluetooth low energy/Multi-standard SensorTag  CC2650STK  Development kit 

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