Texas Instruments MSP430FR5041IPMR

Overview

MSP430FR5041IPMR 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, 32KB 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 PHY. It achieves ±12.5-ps dToF accuracy for water flow and supports pipe diameters from 15 mm to 1000 mm.

For engineers reviewing the MSP430FR5041IPMR datasheet, MSP430FR5041IPMR pinout, MSP430FR5041IPMR application, or MSP430FR5041IPMR equivalent, key selection criteria include differential time-of-flight resolution, ultra-low-power LPM3.5 current (450 nA), integrated USS_A analog front end, FRAM endurance (10¹⁵ writes), and UART/I²C bootloader support.

Technical Context

The MSP430FR5041IPMR implements a dedicated USS_A subsystem comprising a programmable pulse generator (PPG), low-impedance 4-Ω PHY driver, PGA (–6.5 dB to 30.8 dB), and high-speed SDHS ADC with up to 8 Msps output rate. Its PLL delivers 68–80 MHz clocking for precise timing acquisition.

Digital signal processing is accelerated by the Low-Energy Accelerator (LEA), operating independently of the CPU with 8KB shared RAM and delivering up to 40× faster 256-point complex FFT versus Cortex-M0+. The device supports metering test interface (MTIF) with 1024 p/s pulse generation and operates in LPM3.5 at 200 nA typical.

Key Specifications

Pinout & Package

LQFP-64 package (10 mm × 10 mm) with exposed thermal pad; 44 configurable GPIOs, dedicated USS_A analog terminals (CH0_IN/OUT, CH1_IN/OUT, USSXTIN/OUT/XT_BOUT), and separate analog/digital power domains (AVCC/AVSS, DVCC/DVSS, PVCC/PVSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FR5043IPM, the MSP430FR5041IPMR offers identical ultrasonic metrology performance at lower memory cost; compared with MSP430FR6041IPN, it trades LCD integration for smaller footprint and lower BOM count in headless meter designs.

Availability

MSP430FR5041IPMR is available at Aetrix Electronics and suitable for ultrasonic smart water meters, smart gas meters, and flow transmitters requiring stable component supply, long-life battery operation, and metrology-grade timing accuracy.

Supply support for MSP430FR5041IPMR 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 solutions for industrial, automotive, and consumer markets.

The MSP430FR504x product line is designed specifically for ultrasonic flow measurement in battery-powered utility meters, integrating metrology-grade analog front ends, ultra-low-power operation, and FRAM-based firmware resilience.

FAQ

What is the primary metrology function of the MSP430FR5041IPMR in ultrasonic flow measurement?

The MSP430FR5041IPMR performs differential time-of-flight (dToF) calculation using its integrated USS_A subsystem - including PPG, 4-Ω PHY, PGA, and 8-MSPS SDHS ADC - to achieve ±12.5-ps accuracy for water flow. This enables ±1% metering accuracy across a 500:1 dynamic range, directly supporting ISO4064 Class C compliance. The MSP430FR5041IPMR handles all signal acquisition, timing analysis, and flow computation on-chip without external co-processors.

Does the MSP430FR5041IPMR support both water and gas flow measurement?

Yes, the MSP430FR5041IPMR supports both water and gas flow measurement through configurable USS_A parameters. For water, it achieves ±12.5-ps dToF accuracy and 500:1 dynamic range; for gas, it delivers ±250-ps dToF accuracy and 200:1 dynamic range up to 12,000 L/h. Its programmable PPG, PGA, and SDHS ADC allow tuning for different transducer frequencies (up to 2.5 MHz) and acoustic propagation characteristics in liquid vs. gaseous media - all within the same MSP430FR5041IPMR hardware platform.

What is the role of the Low-Energy Accelerator (LEA) in the MSP430FR5041IPMR?

The LEA in the MSP430FR5041IPMR is a dedicated hardware accelerator that performs FFT, FIR, and matrix operations independently of the CPU, using 8KB of shared RAM. It executes a 256-point complex FFT up to 40× faster than the CPU alone, enabling real-time spectral analysis of ultrasonic echoes while the CPU remains free for communication, display, or security tasks. This offloading reduces active-mode current and shortens wake-up latency - critical for battery-powered metering where processing must complete within tight energy budgets.

How does the MSP430FR5041IPMR meet utility certification standards like ISO4064 and OIML R49?

The MSP430FR5041IPMR meets ISO4064, OIML R49, EN 14236, and EN 1434 through its hardware-level metrology features: ±12.5-ps dToF accuracy (water), ±250-ps dToF accuracy (gas), integrated MTIF for pulse output verification, and temperature-compensated timing using the 3.7-pF crystal interface (USSXTIN/OUT). Its USS_A subsystem's low-impedance PHY and programmable gain amplifier minimize zero-flow drift, while FRAM ensures tamper-resistant, wear-free storage of calibration constants and usage logs - all validated in TI's reference designs for certified meter implementations.

What package and pin count does the MSP430FR5041IPMR use, and how many GPIOs are available?

The MSP430FR5041IPMR uses a 64-pin LQFP package (10 mm × 10 mm) with 44 usable GPIOs. Pin functions include 2 dedicated ultrasonic channel pairs (CH0_IN/OUT, CH1_IN/OUT), 2 crystal interfaces (USSXTIN/OUT, LFXIN/LFXOUT), MTIF control (MTIF_PIN_EN, MTIF_OUT_IN), and multiple eUSCI_A/B ports for UART/I²C communication. All pins support capacitive-touch capability without external components, and unused pins can be configured as pullup/pulldown I/O - simplifying PCB layout for compact meter modules.