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Flow Meter ref design using the world’s lowest-power MCU

3,867 views · Published 27 August 2014 · 5:56 · Indexed 29 October 2026

Channel: Texas Instruments · 2014 · Science & Technology

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In a battery-operated water meter, long battery life is the key. One of the challenges is to continuously measure the water flow information while consuming the least energy possible. The Extended Scan Interface (ESI) sensing peripheral integrated onto the ultra-low-power MSP430 microcontroller is solving this problem. By using ESI, it automates the measurement process and reduces CPU involvement, which helps to reduce power consumption of the MCU. In water meter designs, coupled to a LC rotation detection sensor, the ESI continuously detects the rotation of the propeller while the rest of the microcontroller is sleeping in low-power mode. This reference design demonstrates a usage example of the ESI to achieve ultra-low power consumption compared with the same detecting methodology using external circuit.

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