Water Meter Reference Design for two LC Sensors, Using Extended Scan Interface (ESI)
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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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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
MSP430F5528  25 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR6989  Rotary Sensing MCU with extended scan interface, 128KB FRAM, AES, LCD for flow meters  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
TUSB2046B  4-port USB 2.0 12-Mbps USB full-speed hub  USB ICs  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
MSP430F5528 Download Download
Download -
(ZQE) | 80 Download -
MSP430FR6989 Download Download
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TUSB2046B Download Download
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Technical documentation

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Application note (2)
Title Type Size (KB) Date
PDF 374 28 Aug 2014
PDF 2171 28 Aug 2014
User guide (1)
Title Type Size (KB) Date
PDF 3054 25 Aug 2014
Design files (5)
Title Type Size (KB) Date
ZIP 562 25 Aug 2014
ZIP 318 25 Aug 2014
ZIP 874 25 Aug 2014
PDF 138 25 Aug 2014
ZIP 228 25 Aug 2014
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