Water Meter Reference Design for three LC Sensors, Using Extended Scan Interface (ESI)
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 3 LC rotation detection sensors, 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
- Supports 3 LC sensor 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)
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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MSP430F5528 — 25 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplierData sheet: PDF | HTML
MSP430FR6989 — Rotary Sensing MCU with extended scan interface, 128KB FRAM, AES, LCD for flow metersData sheet: PDF | HTML
|*||Design guide||Mechanical to Electronic Conv-3LC Sensors for Gas or Water Meter Design Guide||Aug. 25, 2014|
|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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