Low-Cost Water Meter Implementation with FRAM Microcontroller Reference Design
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This reference design, featuring the MSP430FR4133 FRAM-based MCU, is a fully-functional battery powered magnetic pulse water meter with wired and wireless automatic meter reading (AMR) function. The instantaneous and total flow is displayed on the LCD. This design works in low power mode and reduces CPU engagement, which helps to reduce overall power consumption.

  • Magnetic pulse measurement
  • 2.9uA standby current
  • Non-volatile on-chip FRAM real-time storage
  • Support NFC and Sub-1GHz BoosterPack
  • Battery voltage monitor
  • This end equipment design is tested and includes HW, firmware, GUI, demo and User's Guide

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Schematic/Block Diagram

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Design Guide

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DRV8837  11-V, 1.8-A H-bridge motor driver  Motor drivers  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR4133  16 MHz MCU with 16KB FRAM, 2KB SRAM, 10-bit ADC, LCD, UART/SPI/I2C, IR Logic, Timer  Microcontrollers (MCU)  Sample & Buy View Design Kits & Evaluation Modules
SN65HVD75  3.3-V half-duplex RS-485 transceiver with IEC ESD, 20 Mbps  Interface  Sample & Buy View Design Kits & Evaluation Modules
TPS782  150-mA, nano-IQ, low-dropout voltage regulator with enable from -40°C to +125°C  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
DRV8837 Download Download
MSP430FR4133 Download Download
Download Download
Download Download
SN65HVD75 Download
TPS782 -

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 10289 15 Oct 2014
Design files (6)
Title Type Size (KB) Date
ZIP 2880 03 Oct 2014
ZIP 150 03 Oct 2014
ZIP 373 03 Oct 2014
ZIP 4143 03 Oct 2014
PDF 61 03 Oct 2014
PDF 101 03 Oct 2014
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
MSP430FR4133 LaunchPad Development Kit  MSP-EXP430FR4133  Development kits 

Software development (2)

Name Part Number Software Type
EnergyTrace Technology  ENERGYTRACE  IDEs, configuration, compilers & debuggers 

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