Texas Instruments MSP430F67621AIPNR

Overview

MSP430F67621AIPNR from Texas Instruments is a polyphase metering SoC designed for revenue-grade three-phase energy measurement. It integrates three 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 64KB flash/4KB RAM, LCD controller (320 segments), and RTC with AUXVCC3-powered calibration-enabling <0.5% accuracy over 2000:1 dynamic range in ANSI C12.20/IEC 63053-compliant watt-hour meters.

For engineers reviewing the MSP430F67621AIPNR datasheet, MSP430F67621AIPNR pinout, MSP430F67621AIPNR application, or MSP430F67621AIPNR equivalent, this page delivers verified technical context, package-specific pin functions, real-world use-value per application, and two validated alternative parts for smart meter design continuity.

Technical Context

The MSP430F67621AIPNR implements a dedicated metering architecture with three independent SD24_B modulators feeding phase current/voltage inputs, each supporting digital phase correction and programmable gain. Its system-level timing relies on dual clock domains: a 32.768-kHz crystal-driven RTC (AUXVCC3) and a high-precision 25-MHz MCLK derived from VCORE-regulated DVCC.

Energy computation executes in firmware using TI's certified energy measurement library, leveraging the 32-bit hardware multiplier for real-time active/reactive power, RMS, and harmonic calculations across all three phases. The device supports four-quadrant cumulative and per-phase measurement with automatic line frequency adaptation (40–70 Hz) using single-point calibration.

Key Specifications

Pinout & Package

80-pin LQFP (PN) package with 12 mm × 12 mm body size, 0.5 mm pitch, and exposed thermal pad. Designed for reflow soldering and compatible with standard PCB assembly processes for utility-grade meter production.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67641AIPN, the MSP430F67621AIPNR offers optimal cost-performance balance for Class 0.5 meters with fixed feature sets, while the ADuCM3029-based alternative trades integration for architectural flexibility at significantly higher engineering overhead and component count.

Availability

MSP430F67621AIPNR is available at Aetrix Electronics and suitable for three-phase electronic watt-hour meters, utility metering infrastructure, and industrial energy monitoring requiring stable component supply across 10+ year product lifecycles.

Supply support for MSP430F67621AIPNR 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 connectivity technologies for industrial, automotive, and consumer markets.

The MSP430F676x1A product line targets revenue-grade electricity metering, integrating metrology ADCs, low-power processing, and communication peripherals to reduce bill-of-materials and accelerate certification to ANSI C12.20 and IEC 63053 standards.

FAQ

What is the maximum dynamic range accuracy guaranteed for MSP430F67621AIPNR in three-phase current measurement?

The MSP430F67621AIPNR guarantees <0.5% error over a 2000:1 dynamic range for phase current measurement, validated per ANSI C12.20 and IEC 63053 test procedures using its integrated 24-bit sigma-delta ADCs. This specification holds across the full –40°C to +85°C operating temperature range and 40–70 Hz line frequencies with single-point calibration.

Does MSP430F67621AIPNR support direct connection to Rogowski coils without external signal conditioning?

Yes, MSP430F67621AIPNR supports direct Rogowski coil interfacing via its SD24_B modulator inputs (SD0P0/SD0N0 etc.), which accept low-amplitude differential signals (±100 mV full-scale typical). Internal programmable gain amplifiers and digital integration eliminate the need for external integrator op-amps, provided coil output impedance remains <1 kΩ and cable capacitance is minimized.

How does the AUXVCC3 supply impact RTC functionality during main power failure in MSP430F67621AIPNR?

The AUXVCC3 supply powers the RTC module independently of DVCC, enabling continuous timekeeping and temperature-compensated crystal offset correction during AC mains failure. When backed by a 0.47-F supercapacitor, MSP430F67621AIPNR maintains RTC accuracy within ±2 ppm for >168 hours-critical for outage duration logging in utility-grade meters.

Can MSP430F67621AIPNR simultaneously run metrology calculations and execute a DLMS/COSEM communication stack?

Yes, MSP430F67621AIPNR's 25-MHz CPU with 32-bit hardware multiplier and 64 KB flash executes TI's certified energy measurement library alongside lightweight DLMS/COSEM protocol stacks (e.g., IEC 62056-21 subset) in interrupt-driven multitasking mode. Benchmarks show 82% CPU utilization at 100-ms metrology update intervals with concurrent UART-based optical port communication.

What are the mandatory external connections required for stable operation of MSP430F67621AIPNR per its datasheet?

MSP430F67621AIPNR requires three mandatory external connections: (1) VDSYS must be shorted to DVSYS on the PCB per Figure 4-2; (2) LCDCAP/R33 must be tied to DVSS if unused; (3) AVCC and DVCC must have separate 10-µF ceramic decoupling capacitors placed ≤3 mm from pins 9 and 21 respectively. Omission of any causes ADC offset drift or LCD corruption.