Texas Instruments MSP430F67621IPNR

Overview

MSP430F67621IPNR from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase electricity meters, featuring three independent 24-bit sigma-delta ADCs, 64KB flash, 4KB RAM, and real-time clock with dedicated AUXVCC3 supply - enabling <0.5% accuracy over 2000:1 dynamic range and compliance with ANSI C12.20 and IEC 63053 standards.

For engineers reviewing the MSP430F67621IPNR datasheet, MSP430F67621IPNR pinout, MSP430F67621IPNR application, or MSP430F67621IPNR equivalent, key selection considerations include its 80-pin LQFP (PN) package with 52 GPIOs, ultra-low-power LPM3.5 mode (1.24 µA), 25-MHz CPU with 32-bit multiplier, and integrated LCD driver supporting up to 320 segments for direct display interfacing in utility meter designs.

Technical Context

The MSP430F67621IPNR integrates TI's high-precision 24-bit SD24_B ADC subsystem with differential inputs, programmable gain, and digital phase correction for current transformers - all synchronized to a single 32768-Hz crystal reference. Its modulator-based architecture supports simultaneous sampling across three phases with exact phase angle measurement and four-quadrant power calculation per phase.

It executes TI's certified energy measurement software library in firmware, leveraging the 25-MHz MSP430 CPU and hardware multiplier to compute active/reactive/apparent energy, RMS voltage/current, and power factor without external co-processing. The device uses dual power domains (AVCC/DVCC + AUXVCC3) to isolate RTC and backup subsystems during AC mains failure.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PN), 12 mm × 12 mm body, industrial temperature range (–40°C to +85°C). Pinout validated per TI SLAS998A Rev. October 2018, Section 4.2 (PN package signal descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67641IPNR, the MSP430F67621IPNR offers optimized cost and footprint for standard Class 0.5 meters without sacrificing metrology fidelity, while ADuCM3029BBCZ trades ultra-low-power RTC autonomy and integrated display for greater processing flexibility and ARM ecosystem support.

Availability

MSP430F67621IPNR is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, utility AMI deployments, and industrial energy monitoring systems requiring stable component supply, long lifecycle assurance, and traceable sourcing.

Supply support for MSP430F67621IPNR 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 high-reliability ICs for industrial, automotive, and energy infrastructure markets.

The MSP430F676x1 product line was engineered specifically for revenue-grade polyphase metering - integrating metrology-grade ADCs, ultra-low-power operation, and certified software to accelerate compliant smart meter development.

FAQ

What is the primary metrology accuracy specification of the MSP430F67621IPNR?

The MSP430F67621IPNR achieves <0.5% total error over a 2000:1 dynamic range for phase current measurements, meeting ANSI C12.20 Class 0.5 and IEC 63053 requirements. This accuracy is enabled by its three 24-bit sigma-delta ADCs with digital phase correction, programmable gain, and synchronized sampling - all validated across 40–70 Hz line frequencies using a single crystal calibration.

Does the MSP430F67621IPNR support real-time clock operation during AC mains failure?

Yes, the MSP430F67621IPNR supports continuous RTC operation during AC mains failure via its dedicated AUXVCC3 power supply rail. In LPM3.5 mode, it draws only 1.24 µA at 3 V, allowing retention of time, date, and critical registers for >72 hours using a typical 0.22-F supercapacitor - with factory-trimmed temperature and offset calibration for long-term stability.

How many analog inputs does the MSP430F67621IPNR support for polyphase metering?

The MSP430F67621IPNR supports six dedicated differential analog inputs across three independent 24-bit SD24_B sigma-delta converters (SD0P0/SD0N0, SD1P0/SD1N0, SD2P0/SD2N0), enabling simultaneous voltage and current sampling per phase in 3-phase 4-wire configurations. It also includes a 10-bit system ADC (ADC10_A) with six external channels plus internal temperature and supply monitoring.

What package and pin count does the MSP430F67621IPNR use?

The MSP430F67621IPNR is offered exclusively in the 80-pin LQFP (PN) package, measuring 12 mm × 12 mm, with 52 general-purpose I/O pins. This variant omits two SD24_B modulator pins and several LCD segment lines compared to the 100-pin PZ version, optimizing cost and board space for mid-tier meter designs without compromising core metrology functionality.

Can the MSP430F67621IPNR drive an LCD display directly?

Yes, the MSP430F67621IPNR integrates a programmable LCD controller supporting up to 320 segments (8 commons × 40 segments) with internal charge pump and contrast control. Pins including COM0–COM7, S0–S39, LCDCAP, and P1.4/P1.5 provide full hardware-level LCD driving capability - eliminating external segment drivers and reducing component count in front-panel meter displays.