Texas Instruments MSP430F6721AIPZR

Overview

MSP430F6721AIPZR from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for single-phase electronic watt-hour metering. It integrates two 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver supporting up to 320 segments, real-time clock with crystal offset calibration, and three eUSCI_A modules for UART/IrDA/SPI plus one eUSCI_B for I²C/SPI - all operating from 1.8 V to 3.6 V supply.

For engineers reviewing the MSP430F6721AIPZR datasheet, MSP430F6721AIPZR pinout, MSP430F6721AIPZR application, or MSP430F6721AIPZR equivalent, key selection criteria include its dual SD24_B ADC architecture, LQFP-100 package with 72 GPIOs, RTC-backed low-power modes (1.24 µA in LPM3.5), integrated LCD contrast control, and support for energy measurement firmware stacks including TI's Energy Measurement Design Center.

Technical Context

The MSP430F6721AIPZR implements a 16-bit RISC CPU with 25-MHz system clock capability, unified clock system featuring FLL stabilization, VLO/REFO/XT1 sources, and programmable LDO core regulation. Its peripheral set targets metrology-grade signal acquisition: dual 24-bit SD24_B converters with differential PGA inputs enable simultaneous voltage/current channel sampling with high resolution and linearity.

Power management includes four low-power modes (LPM0–LPM4.5), fast 3-µs wake-up from LPM3, auxiliary supply domain for RTC and backup memory, and separate AVCC/DVCC rails. The device supports hardware-accelerated 32-bit multiplication and three-channel DMA to offload CPU during high-throughput ADC and LCD operations.

Key Specifications

Pinout & Package

LQFP-100 package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad; requires external connection of VDSYS/DVSYS pins per TI design guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6723AIPZR and MSP430F6720AIPZR, the MSP430F6721AIPZR offers optimal balance of memory headroom (32 KB flash), metrology-grade peripherals, and low-power operation - making it ideal for certified Class 0.2 single-phase meters requiring long-term stability and firmware maintainability.

Availability

MSP430F6721AIPZR is available at Aetrix Electronics and suitable for single-phase watt-hour meters, utility grid sensor nodes, and smart plug energy analytics requiring stable component supply, long-lifecycle support, and TI-qualified metrology performance.

Supply support for MSP430F6721AIPZR 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 deep expertise in ultra-low-power design and precision metrology systems.

The MSP430F672xA product line is engineered specifically for single-phase energy measurement applications, integrating metrology-optimized ADCs, RTC, LCD, and low-power architecture to meet IEC 62053 standards without external support ICs.

FAQ

What is the maximum system clock frequency supported by the MSP430F6721AIPZR?

The MSP430F6721AIPZR supports a maximum system clock frequency of 25 MHz, enabled by its integrated FLL (Frequency-Locked Loop) with stabilization from internal or external reference sources. This speed allows real-time execution of metrology algorithms such as RMS calculation, harmonic analysis, and tariff switching while maintaining ultra-low power consumption in active mode (265 µA/MHz at 8 MHz, 3.0 V).

Does the MSP430F6721AIPZR include hardware support for metrology-specific calculations?

Yes, the MSP430F6721AIPZR includes a 32-bit hardware multiplier (MPY32) that accelerates fixed-point arithmetic essential for RMS, fundamental power, and harmonic computations. Combined with three-channel DMA and dual SD24_B ADCs, this enables efficient offloading of time-critical metrology tasks from the CPU - a key capability confirmed in TI's Energy Measurement Design Center documentation for MSP430F672xA devices.

How many analog input channels does the MSP430F6721AIPZR support for energy measurement?

The MSP430F6721AIPZR supports six external analog input channels via its dual 24-bit SD24_B ADC modules (three differential pairs), plus two internal channels (temperature sensor and supply voltage). Its 10-bit ADC adds six additional external channels - totaling up to 12 configurable analog inputs, enabling simultaneous voltage, current, neutral, and auxiliary measurements in single-phase meter designs.

What LCD configuration options are available on the MSP430F6721AIPZR?

The MSP430F6721AIPZR integrates the LCD_C peripheral supporting up to 320 segments in 8-mux mode, with programmable contrast control, charge pump, and static drive capability. It provides four COM outputs (COM0–COM3) and 80 segment pins (S0–S79), allowing flexible display layouts - including 4-digit numeric displays with symbols or custom icons - all managed in hardware without CPU intervention during refresh cycles.

Is the MSP430F6721AIPZR qualified for use in revenue-grade electricity meters?

Yes, the MSP430F6721AIPZR is designed and characterized for revenue-grade metering applications compliant with IEC 62053-21 Class 0.2 accuracy requirements. Its dual 24-bit SD24_B ADCs, temperature-compensated RTC, low-drift internal references, and validated metrology firmware libraries (e.g., TI's Energy Measurement Library) confirm suitability for certified single-phase watt-hour meters deployed in utility infrastructure.