Ultrasonic Water Flow Meter Design using Time to Digital Conversion


Design files


The TIDM-ULTRASONIC-FLOW-TDC is a reference design for an ultrasonic flow meter (water, gas or heat meter) with LCD built using a Time-to-Digital converter and an ultra-low power MCU. Solution includes optimized leakage detection, low power consumption, and a small form factor that are important requirements for water, heat and gas meter applications. This design also includes a high efficiency DC-DC converter for system power.

  • A small form factor, ultra-low power design
  • Ultrasonic Time of Flight measurement - No moving parts
  • Highly efficient DC-DC converter for system power
  • Super-cap design for power supply of RF module
  • Platform Design with sockets for RF, power module and MCU I/Os
  • PC GUI and firmware ready
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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.

TIDU965A.PDF (5731 K)

Reference design overview and verified performance test data

TIDREV1.PDF (1040 K)

Detailed schematic diagram for design layout and components


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

TIDREV4.ZIP (1126 K)

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


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

TIDREV3.PDF (3144 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

TPS61291Low Iq Boost Converter with 15nA Bypass Operation

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS627402.2V-5.5V input, ultra-low-power 300mA step-down buck DCDC converter with 360nA Iq

Data sheet: PDF | HTML
ESD protection diodes

TPD8E0038 channel 9-pF, 5.5-V, ±12-kV ESD protection diode

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR6989Rotary Sensing MCU with extended scan interface, 128KB FRAM, AES, LCD for flow meters

Data sheet: PDF | HTML
Ultrasonic sensor AFEs

TDC7200Time-to-digital converter for time-of-flight (ToF) applications for LIDAR and ultrasonic

Data sheet: PDF | HTML

Start development


Technical documentation

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Type Title Date
* Design guide Ultrasonic Water Flow Measurement Using Time to Digital Conversion Design Guide (Rev. A) Jul. 20, 2015
Technical article Time-of-flight measurements using high-performance time-to-digital converters PDF | HTML Jul. 31, 2015
Technical article Why are flow meter manufacturers switching from mechanical to ultrasonic? PDF | HTML Jun. 11, 2015

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