Texas Instruments MSP430F67621IPN

Overview

MSP430F67621IPN from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase electricity meters, featuring three independent 24-bit sigma-delta ADCs (±0.5% accuracy over 2000:1 dynamic range), 64KB flash/4KB RAM, and real-time clock with dedicated AUXVCC3 backup supply. It supports ANSI C12.20 and IEC 63053 compliance, four-quadrant power measurement per phase, and operates from 1.8 V to 3.6 V.

For engineers reviewing the MSP430F67621IPN datasheet, MSP430F67621IPN pinout, MSP430F67621IPN application, or MSP430F67621IPN equivalent, this device serves as a system-on-chip solution integrating energy calculation, LCD driving (up to 320 segments), ultra-low-power RTC (1.24 µA in LPM3.5), and configurable communication interfaces (UART/SPI/I²C) for smart meter firmware deployment and certification testing.

Technical Context

The MSP430F67621IPN implements a 25-MHz 16-bit RISC CPU with 32-bit hardware multiplier for real-time energy computation across three phases using synchronized sampling from three SD24_B modulators. Its analog front end includes differential inputs with programmable gain, digital phase correction for CTs, and single-calibration support across 40–70 Hz line frequencies.

Digital subsystems include four 16-bit timers (nine capture/compare registers), eUSCI modules configurable as three UARTs, three SPIs, or one I²C, and an LCD controller with contrast control and segment mapping for direct drive of 320-segment displays without external bias generation.

Key Specifications

Pinout & Package

80-pin LQFP (PN) package with 12 mm × 12 mm body size, industrial temperature rating (–40°C to +85°C), and separate analog/digital/auxiliary power domains (AVCC/AVSS, DVCC/DVSS, AUXVCC1–3) for metrology-grade signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67641IPN, the MSP430F67621IPN offers reduced memory footprint for cost-sensitive meters, while AD7176-2 shifts computational responsibility to an external host-increasing PCB area and firmware complexity but enabling independent qualification of metrology and control subsystems.

Availability

MSP430F67621IPN is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, utility grid monitoring systems, and industrial energy monitors requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F67621IPN 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 with broad industrial and automotive portfolio coverage.

The MSP430F676x1 product line delivers ultra-low-power, high-accuracy metering SoCs targeting revenue-grade electricity meters compliant with ANSI C12.20 and IEC 63053 standards.

FAQ

What metrology standards does the MSP430F67621IPN support?

The MSP430F67621IPN meets or exceeds ANSI C12.20 Class 0.5 and IEC 63053 requirements for polyphase energy measurement accuracy, including four-quadrant operation, harmonic immunity, and temperature stability across –40°C to +85°C. Its 24-bit sigma-delta ADC architecture and on-chip digital phase correction ensure compliance without external calibration components. The MSP430F67621IPN integrates all necessary metrology functions-including synchronized sampling, RMS calculation, and reactive power derivation-within a single die.

How many analog inputs does the MSP430F67621IPN support for current and voltage sensing?

The MSP430F67621IPN supports six dedicated differential analog inputs via three independent 24-bit sigma-delta modulators (SD24_B): SD0P0/SD0N0 for phase A current, SD1P0/SD1N0 for phase B current, and SD2P0/SD2N0 for phase C current. Voltage sensing is performed through the 10-bit ADC's six external channels (A0–A5), which can be routed to phase voltage dividers. The MSP430F67621IPN does not integrate dedicated voltage-input sigma-delta converters but relies on its high-resolution SD24_B for primary current measurement and 10-bit ADC for auxiliary voltage monitoring.

What is the lowest power mode available for RTC operation on the MSP430F67621IPN?

The MSP430F67621IPN supports RTC Mode (LPM3.5) with typical current consumption of 1.24 µA at 3 V, powered exclusively from the dedicated AUXVCC3 supply. This mode retains RTC calendar/time registers and continues timekeeping during main power failure while disabling CPU, flash, and most peripherals. The MSP430F67621IPN achieves this ultra-low power state by isolating the RTC subsystem and using a low-frequency oscillator optimized for backup operation.

Does the MSP430F67621IPN include an integrated LCD driver, and what is its segment capacity?

Yes, the MSP430F67621IPN includes a fully integrated LCD controller supporting up to 320 segments with built-in contrast control, charge pump, and programmable bias configuration. It drives common outputs (COM0–COM7) and segment outputs (S0–S39 plus additional mapped pins) directly-eliminating external LCD bias generators. The MSP430F67621IPN's LCD module operates in LPM3 with only 3 µA supply current, enabling persistent display during mains failure.

What communication interfaces are available on the MSP430F67621IPN, and how are they configured?

The MSP430F67621IPN provides four eUSCI modules: three eUSCI_A (configurable as UART or SPI) and one eUSCI_B (configurable as SPI or I²C). These support concurrent interfaces-for example, UART for optical port, SPI for PLC modem, and I²C for EEPROM or sensor ICs. Pin multiplexing allows flexible routing (e.g., P1.2/P1.3 default to UCA0RXD/UCA0TXD). The MSP430F67621IPN's eUSCI modules include automatic baud-rate detection, LIN break detection, and clock timeout features tailored for smart meter communication robustness.