Ultra-low power water flow measurement for AMR reference design
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Key Document


This fully tested reference design demonstrates a low-power solution for electronic measurement of water flow through a mechanical meter and provides a single-chip platform for flow measurement and wireless communications. The design is ideal for water meter automatic meter reading (AMR) modules that add wireless communications to existing mechanical meters. The RF subsystem supports standard protocols such as wireless M-Bus or proprietary protocols in the Sub-1 GHz ISM bands. This reference design offers the ability to accurately read the mechanical rotation from longer distances, and provides greater reliability. The ultra-low power consumption reduces the battery requirement and extends product lifetime.

  • Single-chip integrated solution with flow meter metrology and RF communications subsystem
  • Meets measurement accuracy requirements of ISO4064-1:2014-11 (Class 1)
  • Consumes 1.83 µA while sampling at 16 Hz with 3.3-V power supply
  • Accurate measurement at up to 5.8 mm from rotating disc
  • Complete tested reference design with firmware, design files and test report

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD23285F5  -12-V, P channel NexFET™ power MOSFET, single LGA 0.8 mm x 1.5 mm, 35 mOhm, gate ESD protection  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
SN74AUP1T00  Low Power, 1.8/2.5/3.3-V In, 3.3-V CMOS Out, Single 2-Input Positive-NAND Gate  Voltage level translators  Sample & Buy View Design Kits & Evaluation Modules
SN74AUP2G00  2-ch, 2-input, 0.8-V to 3.6-V low power NAND gates  Gate  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
SN74AUP1T00 Download Download
SN74AUP2G00 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 5064 12 Apr 2019
Design files (6)
Title Type Size (KB) Date
ZIP 533 12 Apr 2019
ZIP 520 12 Apr 2019
PDF 496 12 Apr 2019
PDF 114 12 Apr 2019
PDF 204 12 Apr 2019
PDF 743 12 Apr 2019
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
SimpleLink™ Sub-1 GHz CC1312R Wireless Microcontroller (MCU) LaunchPad™ Development Kit  LAUNCHXL-CC1312R1  Development kit 

Software development (3)

Name Part Number Software Type
Sensor Controller Studio  SENSOR-CONTROLLER-STUDIO  IDE, configuration, compiler or debugger 
SimpleLink™ CC13x2 and CC26x2 software development kit (SDK)  SIMPLELINK-CC13X2-26X2-SDK  Software development kit (SDK) 

Models (1)

Title Category Type Size (KB) Date Views
TIDA-010050 Simulation TINA-TI Reference Design ZIP 10 KB 12 Apr 2019

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