Water Meter Reference Design for two LC Sensors, Using Extended Scan Interface (ESI)


Design files


One of the challenges in battery operated water meters is to continuously measure the water flow information while consuming as little energy as possible. The EVM430-FR6989 used in this design features a MSP430 FRAM-based microcontroller with 100uA/MHz active-mode current, 450nA standby-mode current with the real-time clock enabled, and integrated low-power analog and digital peripherals. Additionally, the MCU offers for near infinite write endurance, quick/low-power writes, and data flexibility. This reference design demonstrates a usage example of the integrated Extended Scan Interface (ESI) on the microcontroller to achieve ultra-low power consumption compared with the same detecting methodology using an external circuit. In water meter designs, coupled to LC rotation detection sensor (provided), the ESI is continuously detecting the rotation of the propeller while the rest of the microcontroller is in a low-power mode. By using the ESI integrated in the MSP430 MCU, this design automates the measurement process and reduces CPU involvement, which helps to reduce overall power consumption.

To purchase the kit, please see the EVM430-FR6989 page.

  • Supports 2 LC sensors for detecting rotation movement including rotating direction
  • Ultra-low power consumption compared with external hardware solution
  • GUI for setting up and calibrating the ESI
  • Easy to install daughter sensor board for MCU target board
  • Motor control board with variable speed to simulate flow using metal plate
  • RF socket available to enable Low Power RF extension (Sub 1GHz or 2.4GHz ZigBee)
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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.

TIDU487.PDF (3054 K)

Reference design overview and verified performance test data

TIDRA95.ZIP (562 K)

Detailed schematic diagram for design layout and components

TIDRA92.PDF (138 K)

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

TIDRA93.ZIP (874 K)

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

TIDC582.ZIP (228 K)

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

TIDRA94.ZIP (318 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

MSP430 microcontrollers

MSP430F552825 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier

Data sheet: PDF | HTML
MSP430 microcontrollers

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

Data sheet: PDF | HTML
USB hubs & controllers

TUSB2046B4-port USB 2.0 12-Mbps USB full-speed hub

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide Gas or Water Meter With 2 LC Sensors Design Guide Aug. 25, 2014
Technical article Go differential to differentiate your precision design PDF | HTML Aug. 11, 2016
Application note LC Sensor Rotation Detection With MSP430 Extended Scan Interface (ESI) Aug. 28, 2014
Application note Method to Select the Value of LC Sensor for MSP430 Extended Scan Interface (ESI) Aug. 28, 2014

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