Texas Instruments MSP430FR6043IPN

Overview

MSP430FR6043IPN from Texas Instruments is an ultrasonic sensing microcontroller (MCU) optimized for battery-powered smart water and gas meters. It integrates a 16-MHz RISC CPU, 64KB FRAM, 12KB RAM, 12-bit 8-MSPS sigma-delta ADC (SDHS), programmable gain amplifier (PGA), and dedicated Ultrasonic Sensing Solution (USS_A) subsystem with PPG and low-impedance PHY driver - enabling ±12.5-ps dToF accuracy and <1 L/h minimum detectable flow in water metering applications.

For engineers reviewing the MSP430FR6043IPN datasheet, MSP430FR6043IPN pinout, MSP430FR6043IPN application, or MSP430FR6043IPN equivalent, key selection criteria include differential time-of-flight resolution, integrated USS_A analog front end, FRAM endurance (10¹⁵ writes), ultra-low-power LPM3.5 mode (450 nA), and LCD driver support for 248-segment displays.

Technical Context

The MSP430FR6043IPN implements a tightly coupled signal chain: the programmable pulse generator (PPG) excites ultrasonic transducers up to 2.5 MHz; the USS_A PHY delivers 4-Ω output drive for impedance-matched sensor coupling; and the SDHS ADC digitizes echo signals at 8 MSPS with configurable oversampling. Time-of-flight measurement leverages high-speed digital capture logic within the USS_A module, not general-purpose timers.

Digital processing offloads FFT and filtering to the Low-Energy Accelerator (LEA), operating independently of the CPU with 8KB shared RAM. The LEA achieves up to 40× speedup over the CPU for 256-point complex FFTs - critical for real-time flow computation while maintaining sub-3-µA average current consumption at 1 result/second in water metering.

Key Specifications

Pinout & Package

LQFP-80 package (12 mm × 12 mm), thermally enhanced with dedicated PVCC/PVSS pins for ultrasonic analog supply isolation and AVCC/AVSS rails for precision analog circuitry.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrasonic sensing MCU applications.

Compared with MSP430FR60431IPN, the MSP430FR6043IPN offers UART-based BSL for simpler serial programming infrastructure; versus MSP430FR5043IPM, it adds LCD support and higher I/O count for feature-rich water meters with local UI - both alternatives retain identical ultrasonic sensing accuracy and power profiles.

Availability

MSP430FR6043IPN is available at Aetrix Electronics and suitable for ultrasonic smart water meters, smart gas meters, and heat metering systems requiring stable component supply, long-term lifecycle assurance, and metrology-grade accuracy certification.

Supply support for MSP430FR6043IPN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer applications.

The MSP430FR604x product line is engineered specifically for ultrasonic flow metering - integrating high-precision time measurement, low-noise analog front ends, and ultra-low-power operation to replace multi-chip metering solutions with a single SoC.

FAQ

What is the primary metrology function of the MSP430FR6043IPN in ultrasonic flow measurement?

The MSP430FR6043IPN performs differential time-of-flight (dToF) calculation using its integrated USS_A subsystem, which includes a programmable pulse generator, 4-Ω PHY driver, PGA, and 8-MSPS sigma-delta ADC. It achieves ±12.5-ps dToF accuracy for water and ±250-ps for gas, directly supporting ISO4064 and OIML R49 compliance. The MSP430FR6043IPN processes raw echo waveforms in real time to derive flow rate without external signal conditioning.

Does the MSP430FR6043IPN support direct connection to standard ultrasonic transducers?

Yes, the MSP430FR6043IPN supports direct interface to industry-standard ultrasonic sensors up to 2.5 MHz via its USS_A PHY with 4-Ω output impedance - enabling optimal impedance matching and minimizing zero-flow drift. Transducer excitation is handled by the programmable pulse generator (PPG), and echo reception uses dedicated CH0_IN/CH1_IN pins routed through the PGA and SDHS ADC. No external driver or receiver ICs are required for basic operation.

How does the FRAM memory in the MSP430FR6043IPN benefit flow meter data logging?

The 64KB FRAM in the MSP430FR6043IPN enables fast, low-energy, wear-free data logging: it writes at 125 ns per word (64KB in 4 ms), withstands 10¹⁵ write cycles, and retains data without power. This allows the MSP430FR6043IPN to log thousands of flow events, diagnostic timestamps, and calibration coefficients daily over a 15+ year meter lifetime - unlike flash-based MCUs that suffer from erase-cycle limitations and higher write energy.

What is the role of the Low-Energy Accelerator (LEA) in the MSP430FR6043IPN?

The LEA in the MSP430FR6043IPN is a dedicated signal-processing coprocessor that executes FFTs and filtering algorithms independently of the CPU, using 8KB of shared RAM. It accelerates 256-point complex FFTs up to 40× faster than the CPU - enabling real-time spectral analysis of ultrasonic echoes for advanced flow diagnostics while the CPU remains in ultra-low-power LPM3.5 mode. This capability is integral to the MSP430FR6043IPN's sub-3-µA average current in water metering.

Can the MSP430FR6043IPN drive a segment LCD display without external components?

Yes, the MSP430FR6043IPN integrates a 248-segment LCD_C driver with contrast control, supporting static and multiplexed (2–8 mux) configurations. It drives common-electrode LCDs directly from internal charge pumps and requires no external bias resistors or capacitors. This on-chip LCD capability is exclusive to the MSP430FR604x series (not present in FR504x variants) and is fully supported in the MSP430FR6043IPN's LQFP-80 package.