Texas Instruments MSP430FR60431IPN

Overview

MSP430FR60431IPN from Texas Instruments is an ultrasonic sensing microcontroller (MCU) optimized for smart water and gas metering, integrating 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, PHY, and <100-ps dToF resolution for gas flow. It achieves ±1% accuracy across 200:1 dynamic range at ≤20 µA average current (1 result/s).

For engineers reviewing the MSP430FR60431IPN datasheet, MSP430FR60431IPN pinout, MSP430FR60431IPN application, or MSP430FR60431IPN equivalent, key selection criteria include integrated USS_A timing precision, FRAM endurance (10¹⁵ writes), LPM3.5 RTC operation at 450 nA, MTIF pulse generation up to 1024 p/s, and I²C bootloader support - all in an 80-pin LQFP package.

Technical Context

The MSP430FR60431IPN implements a dedicated ultrasonic sensing signal chain: the USS_A module combines a programmable pulse generator (PPG) driving a low-impedance (4 Ω) PHY output stage, followed by a PGA (–6.5 dB to 30.8 dB gain) and high-speed SDHS ADC (8 Msps, 12-bit). Its PLL delivers 68–80 MHz clocking for precise time-of-flight measurement.

Digital processing leverages the Low-Energy Accelerator (LEA) - an independent 8KB-RAM-coupled coprocessor enabling 256-point complex FFT up to 40× faster than the CPU - while the metering test interface (MTIF) provides hardware pulse generation and counting (16-bit, 1024 p/s) operating in LPM3.5 at 200 nA typical.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PN), 12 mm × 12 mm body size, 0.5-mm pitch. Thermal pad exposed on underside for enhanced power dissipation in ultrasonic transducer driver applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FR6043IPN and MSP430FR50431IPM, the MSP430FR60431IPN uniquely combines I²C bootloader security, full 57-GPIO flexibility, and integrated 248-segment LCD driver - making it optimal for next-generation smart meters requiring field-upgradable firmware and local human-machine interface.

Availability

MSP430FR60431IPN is available at Aetrix Electronics and suitable for ultrasonic smart water meter, ultrasonic smart gas meter, and flow transmitter applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for utility-grade deployments.

Supply support for MSP430FR60431IPN 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 and embedded processing solutions, with over 50 years of innovation in low-power microcontrollers and precision sensing technologies.

The MSP430FR604x family was designed specifically for battery-powered ultrasonic flow metering, integrating TI's FRAM technology and USS_A subsystem to eliminate external analog front-end components while meeting international metrology standards.

FAQ

What distinguishes MSP430FR60431IPN from MSP430FR6043IPN?

The MSP430FR60431IPN features an I²C-based bootloader (BSL) on pins P1.6/BSLSDA and P1.7/BSLSCL, whereas the MSP430FR6043IPN uses UART BSL on P2.0/BSLTX and P2.1/BSLRX. All other specifications - including 64KB FRAM, USS_A subsystem, LEA, MTIF, and 80-pin LQFP package - are identical. This makes MSP430FR60431IPN preferable for systems requiring secure, two-wire firmware updates without UART routing constraints.

Does MSP430FR60431IPN support external crystals for the USS_A timing path?

Yes, MSP430FR60431IPN supports an external 8–16 MHz crystal connected to USSXTIN/USSXTOUT pins to provide a low-jitter reference for the USS_A subsystem. This configuration improves dToF measurement stability under temperature variation and reduces reliance on internal PLL jitter, directly enhancing gas flow accuracy per EN14236 compliance requirements.

How does the MTIF module operate in ultra-low-power modes?

The MTIF module in MSP430FR60431IPN operates autonomously in LPM3.5 (RTC active) at 200 nA typical, generating pulses up to 1024 p/s and counting up to 65535 without CPU intervention. This enables certified pulse output for utility billing while maintaining 15+ year battery life - a critical requirement for sealed, maintenance-free smart meters.

What is the role of the Low-Energy Accelerator (LEA) in ultrasonic signal processing?

The LEA in MSP430FR60431IPN executes compute-intensive tasks like 256-point complex FFT independently of the CPU, using shared 8KB RAM. It delivers up to 40× faster FFT performance than the 16-MHz CPU alone, reducing ultrasonic signal processing time from milliseconds to <100 µs and cutting overall system power by offloading >90% of DSP workload.

Can MSP430FR60431IPN drive standard 2.5-MHz ultrasonic transducers directly?

Yes, MSP430FR60431IPN's USS_A PHY provides a 4-Ω low-impedance output driver on CH0_OUT/CH1_OUT pins, enabling direct excitation of industry-standard 2.5-MHz ultrasonic transducers without external MOSFET drivers or matching networks. This simplifies BOM and improves zero-flow drift (ZFD) performance through precise impedance control.