Texas Instruments MSP430FR5043IRGCT

Overview

MSP430FR5043IRGCT 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 PHY. It achieves ±12.5-ps dToF accuracy for water flow and supports ISO4064/EN14236-compliant metering.

For engineers reviewing the MSP430FR5043IRGCT datasheet, MSP430FR5043IRGCT pinout, MSP430FR5043IRGCT application, or MSP430FR5043IRGCT equivalent, key selection criteria include differential time-of-flight resolution (<5 ps), ultra-low active current (120 µA/MHz), LPM3.5 RTC standby (450 nA), integrated USS_A analog front end, and VQFN-64 package compatibility with ultrasonic transducer drive requirements.

Technical Context

The MSP430FR5043IRGCT implements a tightly coupled signal acquisition and processing chain: the USS_A module generates multi-tone excitation pulses via its programmable pulse generator (PPG), drives transducers through a 4-Ω low-impedance PHY output, conditions echoes with a PGA (–6.5 dB to 30.8 dB gain), and digitizes them using the 12-bit SDHS ADC at up to 8 MSPS. Its high-speed PLL (68–80 MHz) clocks the USS timing engine.

Digital processing is accelerated by the Low-Energy Accelerator (LEA), which operates independently of the CPU and executes 256-point complex FFTs up to 40× faster than the CPU-enabling real-time flow computation while maintaining sub-20 µA system current in gas metering mode with 1 result/second.

Key Specifications

Pinout & Package

VQFN-64 (RGC) package, 9 mm × 9 mm, 0.5-mm pitch, thermally enhanced with exposed thermal pad. Pin count: 64 terminals including 44 GPIOs, 4 dedicated USS analog channels (CH0_IN/OUT, CH1_IN/OUT), 3 crystal inputs (LFXIN/LFXOUT/HFXIN), and 6 power/ground rails (AVCC1/AVSS1–4, DVCC1/DVSS1–3, PVCC/PVSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FR5043IPM, the MSP430FR5043IRGCT enables higher-density layouts and improved thermal performance in sealed meter enclosures; compared with MSP430FR6043IRGCT, it reduces system cost and power by omitting unused LCD peripherals while retaining full ultrasonic metrology capability.

Availability

MSP430FR5043IRGCT is available at Aetrix Electronics and suitable for ultrasonic smart water meters, smart gas meters, and flow transmitters requiring stable component supply, long-term lifecycle assurance, and TI-authorized traceability.

Supply support for MSP430FR5043IRGCT 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 MSP430FR504x product line is engineered specifically for ultrasonic flow metering, integrating precision analog sensing, ultra-low-power processing, and metrology-grade timing to replace multi-chip discrete AFE+MCU solutions.

FAQ

What is the primary function of the USS_A module in the MSP430FR5043IRGCT?

The USS_A module in the MSP430FR5043IRGCT is a fully integrated ultrasonic sensing analog front end that performs transducer excitation (via PPG and 4-Ω PHY), echo amplification (with programmable PGA), and high-speed digitization (using the 12-bit 8-MSPS SDHS ADC). It enables direct connection to industry-standard 2.5-MHz ultrasonic sensors and delivers ±12.5-ps differential time-of-flight accuracy for water flow measurement. The module is central to the MSP430FR5043IRGCT's role as a single-chip metrology solution.

Does the MSP430FR5043IRGCT support ISO4064 and EN14236 compliance out of the box?

Yes, the MSP430FR5043IRGCT is designed to support compliance with ISO4064, OIML R49, EN 14236, and EN 1434 standards for water and gas metering. Its ±12.5-ps dToF accuracy, <5-ps time resolution, and ability to achieve ±1% flow accuracy across a 500:1 dynamic range meet core metrological requirements. However, final certification requires system-level validation-including mechanical housing, transducer placement, temperature compensation algorithms, and firmware implementation-per standard-specific test procedures.

How does the Low-Energy Accelerator (LEA) improve power efficiency in MSP430FR5043IRGCT-based meters?

The LEA in the MSP430FR5043IRGCT accelerates computationally intensive signal processing tasks-such as 256-point complex FFTs-up to 40× faster than the CPU alone, allowing the main CPU to remain in low-power modes longer. This reduces active-mode duration and lowers average system current: for example, in water metering, LEA-executed correlation algorithms cut CPU wake time significantly, enabling the MSP430FR5043IRGCT to sustain ~3 µA average current with one measurement per second-critical for >10-year battery life.

What are the key differences between MSP430FR5043IRGCT and MSP430FR6043IRGCT?

The MSP430FR5043IRGCT lacks the integrated LCD_C driver (248-segment) and one Timer_A instance present in the MSP430FR6043IRGCT. Both share identical USS_A functionality, 64KB FRAM, 12KB RAM, LEA, and power specifications. The MSP430FR5043IRGCT is optimized for metering-only applications without local display, offering lower cost and reduced power consumption by excluding unused peripherals-making it the preferred choice for compact, battery-operated ultrasonic flow sensors where LCD is unnecessary.

Can the MSP430FR5043IRGCT drive ultrasonic transducers directly without external HV components?

The MSP430FR5043IRGCT's USS_A PHY provides a 4-Ω low-impedance output driver capable of driving standard 2.5-MHz ultrasonic transducers directly for low-to-mid voltage bursts (typically ≤20 Vpp). For higher-voltage excitation (>30 Vpp) required in large-pipe or long-range gas metering, an external HV switch or transformer is needed-but the MSP430FR5043IRGCT still controls timing, gain, and signal capture. Its USSXT_BOUT pin synchronizes external HV stages to minimize zero-flow drift, preserving metrological integrity.