The Texas Instruments MSP430FR604x and MSP430FR603x family comprises highly integrated ultrasonic sensing and measurement system-on-chips (SoCs) designed specifically for water and heat metering applications. The featured components, including MSP430FR6047, MSP430FR60471, MSP430FR6045, MSP430FR6037, MSP430FR60371, and MSP430FR6035, deliver best-in-class ultrasonic water flow measurement with ultra-low power consumption. These microcontrollers excel with an active mode current consumption of approximately 120 µA/MHz and a standby mode power draw as low as 450 nA with a real-time clock (RTC) enabled. Key functionalities include a high-precision differential time-of-flight (dTOF) accuracy of less than 25 ps, integrated analog front-end, programmable pulse generation (PPG), and an analog comparator. They also interface directly with standard ultrasonic sensors up to 2.5 MHz and feature up to 256KB FRAM, robust RAM options, and integrated LCD drivers for up to 264 segments. The embedded low-energy accelerator (LEA) enhances digital signal processing capabilities, making these components ideal for battery-powered metering solutions. Peripherals include multiple enhanced serial communication interfaces, high-performance ADCs, DMA controllers, and a suite of timers and encryption modules. These features combine to offer a powerful solution for high-accuracy, low-cost, and ultra-low-power metering applications.

The OPAx863 series from Texas Instruments includes the OPA863, OPA2863, and OPA4863, which are low-power, rail-to-rail input/output, voltage-feedback operational amplifiers designed for high-performance applications. These amplifiers feature a unity-gain bandwidth of 110 MHz, a gain-bandwidth product of 50 MHz, and a low quiescent current of 700 µA per channel. The devices operate across a wide supply voltage range of 2.7 V to 12.6 V, making them suitable for both portable and battery-powered systems. With a slew rate of 105 V/µs, 5.9 nV/√Hz input voltage noise, and exceptional harmonic distortion performance (-129 dBc HD2, -138 dBc HD3 at 20 kHz for 2 Vpp output), the OPAx863 is adept for driving SAR and ΔΣ ADCs, acting as ADC reference buffers, low-side current sensing, photodiode TIA interfaces, and other high-precision tasks. Additional features include overload power limiting, output short-circuit protection, and a power-down mode with minimal quiescent current, making the OPAx863 series a versatile and robust choice for applications requiring low power and high-precision analog performance. The series includes single, dual, and quad-channel configurations available in various surface-mount packages to fit different design requirements.

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For microcontrollers without an analog-to-digital converter or when you want a higher-precision ADC, the ADS1115 provides 16-bit precision at 860 samples/second over I2C. The chip can be configured as 4 single-ended input channels, or two differential channels.