Texas Instruments MSP430F67451AIPZR

Overview

MSP430F67451AIPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four 24-bit sigma-delta ADCs with <0.1% accuracy over 2000:1 dynamic range, 128KB flash, 16KB RAM, and ultra-low-power operation (0.18 µA in LPM4.5). It integrates LCD driver (320 segments), RTC with tamper detection, energy pulse outputs, and supports ANSI C12.20/IEC 62053 compliance.

For engineers reviewing the MSP430F67451AIPZR datasheet, MSP430F67451AIPZR pinout, MSP430F67451AIPZR application, or MSP430F67451AIPZR equivalent, key selection criteria include metrology ADC channel count, phase-angle measurement capability, RTC security features, low-power LCD operation, and compatibility with current transformer or shunt-based sensing topologies.

Technical Context

The MSP430F67451AIPZR implements a dedicated metrology subsystem with four independent SD24_B sigma-delta modulators supporting differential inputs and programmable gain, enabling simultaneous voltage/current sampling per phase in 3-phase+neutral configurations. Its 25-MHz CPU with 32-bit hardware multiplier executes real-time energy calculations including active/reactive power, apparent power, and exact phase-angle derivation.

Digital peripherals include four eUSCI_A modules (UART/IrDA/SPI) and two eUSCI_B modules (SPI/I²C) for smart meter communication stacks, three-channel DMA for zero-CPU-overhead ADC data transfer, and a 16-bit CRC module for firmware integrity verification - all operating under multiple low-power modes with sub-5 µs wake-up latency from LPM3.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 90 general-purpose I/O pins, thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67451AIPZR, the MSP430F67461AIPZR offers headroom for feature-rich firmware updates, while the MSP430F67451IPZ trades I/O and ADC auxiliary pins for compactness - both retain identical metrology performance and security architecture.

Availability

MSP430F67451AIPZR is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade energy monitors, and tamper-resistant utility nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing for global utility deployments.

Supply support for MSP430F67451AIPZR 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 for industrial, automotive, and communications markets.

The MSP430F67451AIPZR belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy, low-power energy measurement in ANSI/IEC-compliant smart grid endpoints.

FAQ

What metrology standards does the MSP430F67451AIPZR meet?

The MSP430F67451AIPZR meets or exceeds ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.2 accuracy requirements for active energy measurement. Its four 24-bit sigma-delta ADCs deliver <0.1% error over 2000:1 dynamic range, and on-chip digital phase correction supports current transformer-based designs without external analog compensation. The MSP430F67451AIPZR also satisfies IEC 62053-31 anti-tamper timing requirements via its password-protected RTC with crystal offset calibration.

How many analog inputs does the MSP430F67451AIPZR support for polyphase measurement?

The MSP430F67451AIPZR supports four differential analog input pairs (SD0P0/SD0N0 through SD3P0/SD3N0) via its SD24_B sigma-delta ADC subsystem. These are configured for simultaneous sampling of phase A, B, C, and neutral currents or voltages - enabling full 3-phase 4-wire metering with CT, Rogowski coil, or shunt sensor interfaces. No external multiplexers or signal conditioning ICs are required for basic topology implementation.

What low-power modes are available on the MSP430F67451AIPZR and their typical current draw?

The MSP430F67451AIPZR offers six low-power modes: LPM3 (2.1 µA at 3 V, RTC active), LPM3.5 (0.34 µA, RTC-only), and LPM4.5 (0.18 µA, full shutdown with RAM retention). In LPM3, the device wakes in <5 µs for metrology interrupts; in LPM4.5, it maintains secure RTC time and tamper logs while drawing minimal battery current - enabling >10-year backup operation with standard coin cells. The MSP430F67451AIPZR's LCD controller consumes just 3 µA in LPM3 during AC mains failure.

Does the MSP430F67451AIPZR include hardware security features for utility applications?

Yes, the MSP430F67451AIPZR integrates multiple hardware security features essential for utility-grade deployment: password-protected RTC with tamper detection (voltage, frequency, temperature), AES-128 encryption engine for secure firmware updates and data transmission, flash memory lock bits to prevent read-out, and memory access control registers. These features satisfy EN 14906 and IEC 62053-31 requirements for tamper evidence and secure timekeeping - critical for revenue meter certification.

What communication interfaces are integrated into the MSP430F67451AIPZR for smart meter connectivity?

The MSP430F67451AIPZR integrates six enhanced universal serial communication interfaces: four eUSCI_A modules supporting UART, IrDA, and SPI (eUSCI_A0–A3), and two eUSCI_B modules supporting SPI and I²C (eUSCI_B0–B1). This enables concurrent connectivity to optical ports (UART), PLC modems (SPI), HAN radios (I²C), and metrology sensor buses - all without external level shifters or protocol translators. The MSP430F67451AIPZR's DMA-assisted UARTs ensure glitch-free 115.2 kbps communication even during peak metrology processing.