Low-Power Water Flow Measurement With Inductive Sensing Reference Design


Design files


This reference design demonstrates a highly-integrated solution for this application using an inductive sensing technique enabled by the CC1350 SimpleLink™ Wireless MCU and FemtoFET™ MOSFET. This reference design also provides the platform for integration of wireless communications such as wireless M-Bus, Sigfox™, or a proprietary protocol. Water utility providers who wish to add Automatic Meter Reading (AMR) capability face the choice of replacing all of their existing meters or installing a simple electronic add-on module, which will accurately measure the water flow rate and wirelessly transmit the results. Such add-on modules can provide the least expensive solution to provide AMR features to consumers. 

  • Meets measurement accuracy requirements of ISO4064-1:2014-11 (Class 1)
  • Accurate measurement at a distance of 4.2 mm to a wheel (11mm diameter)
  • Accurate flow measurement as low as 11.25 liters per hour
  • Consumes only 4µA with 12Hz sampling rate
  • Support ISM bands in 431 to 527MHz and 861 to 1054MHz range plus Bluetooth® Low Energy at 2.4GHz

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.

TIDUD25A.PDF (2151 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.

Multi-protocol products

CC1350SimpleLink™ 32-bit Arm Cortex-M3 multiprotocol Sub-1 GHz & 2.4 GHz wireless MCU with 128kB Flash

Data sheet: PDF | HTML
P-channel MOSFETs

CSD23280F3-12-V, P channel NexFET™ power MOSFET, single LGA 0.6 mm x 0.7 mm, 116 mOhm, gate ESD protection

Data sheet: PDF | HTML
P-channel MOSFETs

CSD23285F5-12-V, P channel NexFET™ power MOSFET, single LGA 0.8 mm x 1.5 mm, 35 mOhm, gate ESD protection

Data sheet: PDF | HTML
Sub-1 GHz products

CC1310SimpleLink™ 32-bit Arm Cortex-M3 Sub-1 GHz wireless MCU with 128kB Flash

Data sheet: PDF | HTML

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Support software

TIDA-01228 Software — TIDCDJ6.ZIP (7646 K)

Technical documentation

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Type Title Date
* Design guide Low-Power Water Flow Measurement With Inductive Sensing Reference Design (Rev. A) Sep. 22, 2017
White paper Modernizing the grid to make it more resilient and reliable through technology (Rev. A) Jan. 08, 2019

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