Texas Instruments MSP430F6731AIPNR

Overview

MSP430F6731AIPNR from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for single-phase electronic watt-hour metering applications. It integrates three 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver (up to 320 segments), real-time clock with crystal offset calibration, and four enhanced USCI modules (three UART/IrDA/SPI + one I²C) in an 80-pin LQFP package. Its 32 KB Flash, 2 KB RAM, and standby current of 1.7 µA at 2.2 V enable long-life battery operation in utility metering systems.

For engineers reviewing the MSP430F6731AIPNR datasheet, MSP430F6731AIPNR pinout, MSP430F6731AIPNR application, or MSP430F6731AIPNR equivalent, this page delivers verified technical context, validated pin functions, confirmed low-power mode behavior, exact ADC channel count (3× SD24_B + 6 external/2 internal 10-bit), and precise package mapping to LQFP-80 (PN).

Technical Context

The MSP430F6731AIPNR implements a 16-bit RISC CPU with 25-MHz system clock capability, unified clock system featuring FLL stabilization, VLO, REFO, and 32-kHz XT1 crystal support, and flexible power management with integrated LDO, supply supervision, and dual auxiliary supply support. Its architecture enables sub-3-µs wake-up from LPM3 standby mode.

It features three independent 24-bit sigma-delta ADCs (SD24_B) with differential PGA inputs for precision metrology, plus a separate 10-bit ADC with internal reference, sample-and-hold, autoscan, and temperature sensor integration. The device includes three-channel DMA, hardware multiplier for 32-bit operations, and password-protected RTC with temperature compensation.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PN), 12 mm × 12 mm body size, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar metrology microcontroller applications.

Compared with MSP430F6733AIPN, the MSP430F6731AIPNR offers sufficient memory for basic DLMS-compliant metering but less headroom for feature-rich firmware; compared with MSP430F6721AIPN, it adds a third SD24_B ADC enabling full 3-wire single-phase measurement with neutral current monitoring.

Availability

MSP430F6731AIPNR is available at Aetrix Electronics and suitable for single-phase electronic watt-hour meters, utility grid sensor nodes, and smart home energy monitors requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MSP430F6731AIPNR 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 specializing in analog, embedded processing, and digital signal processing technologies, with decades of experience in utility infrastructure and industrial control solutions.

The MSP430F673xA family is engineered specifically for precision metrology applications, integrating high-resolution sigma-delta ADCs, low-power RTC, and metering-specific peripherals to simplify compliance with IEC 62053 standards.

FAQ

What is the maximum system clock frequency supported by the MSP430F6731AIPNR?

The MSP430F6731AIPNR supports a maximum system clock (MCLK) frequency of 25 MHz, enabled by its integrated FLL control loop and DCO oscillator. This allows high-speed execution of metrology algorithms and communication stack processing while maintaining ultra-low power consumption in active mode (265 µA/MHz at 8 MHz, 3.0 V). The device achieves sub-3-µs wake-up from LPM3 standby mode, ensuring responsive real-time performance.

Does the MSP430F6731AIPNR include hardware support for energy calculation?

Yes, the MSP430F6731AIPNR includes a dedicated hardware multiplier supporting 32-bit operations, which accelerates energy computation (e.g., active power P = Vrms × Irms × cosφ) and harmonic analysis. Combined with three synchronized 24-bit SD24_B ADCs and three-channel DMA, it enables cycle-accurate sampling and accumulation without CPU intervention-critical for meeting IEC 62053-21 Class 0.2 accuracy requirements in the MSP430F6731AIPNR.

How many analog input channels does the MSP430F6731AIPNR support for metrology measurements?

The MSP430F6731AIPNR supports nine total analog input channels: six external channels and two internal channels (including an integrated temperature sensor) for its 10-bit ADC, plus three fully differential 24-bit sigma-delta ADCs (SD24_B) each with programmable gain amplifier inputs. This configuration enables simultaneous voltage, current, and neutral current sampling for high-accuracy single-phase metering in the MSP430F6731AIPNR.

What package type and pin count does the MSP430F6731AIPNR use?

The MSP430F6731AIPNR uses an 80-pin LQFP package (orderable code "PN"), with 12 mm × 12 mm body size and standard surface-mount footprint. It provides 52 general-purpose I/O pins, including dedicated LCD segment/com drive lines, ADC inputs, UART/I²C interfaces, and crystal oscillator connections-all mapped in the official TI pinout documentation for the MSP430F6731AIPNR.

Is the MSP430F6731AIPNR compatible with the EVM430-F6736 evaluation module?

Yes, the MSP430F6731AIPNR is pin-compatible with the MSP430F6736AIPN used on the EVM430-F6736 evaluation board, sharing the same 80-pin LQFP (PN) package, identical peripheral pin mappings, and compatible power/signal routing. Engineers can use the EVM430-F6736 hardware and Energy Measurement Design Center software to develop and validate firmware for the MSP430F6731AIPNR without hardware modification.