Texas Instruments MSP430F67471AIPZR

Overview

MSP430F67471AIPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four independent 24-bit sigma-delta ADCs, 256KB flash, 32KB RAM, and ultra-low-power operation (0.18 µA in LPM4.5). It supports ANSI C12.20 and IEC 62053 compliance, 4-quadrant energy measurement per phase, and integrated LCD driver for up to 320 segments.

For engineers reviewing the MSP430F67471AIPZR datasheet, MSP430F67471AIPZR pinout, MSP430F67471AIPZR application, or MSP430F67471AIPZR equivalent, key selection criteria include its 128-pin LQFP (PEU) package, 90 GPIOs, dedicated pulse output pins for active/reactive energy calibration, RTC with tamper detection, and support for current transformers, Rogowski coils, or shunt-based sensing in utility-grade metering systems.

Technical Context

The MSP430F67471AIPZR implements a metrology-optimized architecture with four SD24_B sigma-delta modulators feeding dedicated digital filters, enabling <0.1% accuracy over 2000:1 dynamic range for phase current. Its CPU integrates a 32-bit hardware multiplier for real-time energy calculations, while the 24-bit ADCs operate with differential inputs and programmable gain for direct sensor interfacing.

Digital subsystems include three-channel DMA, 16-bit CRC, four Timer_A modules (9 capture/compare registers total), six eUSCI interfaces (four UART/IrDA/SPI-capable, two SPI/I2C-capable), and an LCD controller with contrast control. Power management supports multiple low-power modes, including RTC mode (0.34 µA) and shutdown mode (0.18 µA), with automatic supply switching between AC mains and backup battery.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, with 90 usable I/O pins including dedicated metrology analog inputs (SDxP/N), pulse outputs (Sx), LCD segment/common drivers (COMx, Sx), RTC crystal connections (XIN/XOUT), and dual power domains (AVCC/AVSS, DVCC/DVSS, VASYS/VDSYS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67471AIPZR, the PZ variant trades I/O and LCD capacity for smaller footprint, while the F67671AIPZR adds metrology channel depth and auxiliary monitoring at the cost of higher system-level calibration complexity and flash overhead.

Availability

MSP430F67471AIPZR is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade energy monitors, and anti-tamper utility metering systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for global deployments.

Supply support for MSP430F67471AIPZR 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 decades of expertise in metrology and utility infrastructure solutions.

The MSP430F67xx1A product line was engineered specifically for polyphase energy measurement, integrating metrology-grade ADCs, ultra-low-power operation, and security features to replace discrete metering designs with single-chip SoCs.

FAQ

What is the maximum number of LCD segments supported by the MSP430F67471AIPZR?

The MSP430F67471AIPZR supports up to 320 LCD segments using its integrated LCD_C module with eight common outputs (COM0–COM7) and 40 segment outputs (S0–S39). This enables high-resolution, multiplexed displays for utility meter front panels without external display controllers. The MSP430F67471AIPZR's segment mapping and bias generation are fully configurable in software to match custom glass LCD designs.

Does the MSP430F67471AIPZR support both 50 Hz and 60 Hz line frequencies with a single calibration?

Yes, the MSP430F67471AIPZR supports 40–70 Hz line frequency range with a single factory calibration, eliminating the need for separate 50 Hz and 60 Hz calibration routines. This capability is enabled by adaptive digital filtering and temperature-compensated gain/offset correction algorithms executed in real time by the on-chip CPU and SD24_B modules. The MSP430F67471AIPZR maintains <0.1% accuracy across this full range per ANSI C12.20 and IEC 62053 standards.

How many independent 24-bit sigma-delta ADCs does the MSP430F67471AIPZR integrate?

The MSP430F67471AIPZR integrates four independent 24-bit sigma-delta ADCs (SD24_B modules), each with differential inputs, programmable gain, and dedicated digital filters. These are assigned to phase A, B, C, and neutral current measurement paths, enabling true 4-quadrant per-phase energy calculation. The MSP430F67471AIPZR does not include SD4P0/SD4N0 or SD5/SD6 pins - confirming its four-channel metrology configuration as specified in TI's SLAS983A datasheet Table 3-1.

What low-power modes are available on the MSP430F67471AIPZR, and what is the lowest supply current?

The MSP430F67471AIPZR offers six low-power modes, including LPM3 (standby, 2.1 µA), LPM3.5 (RTC-only, 0.34 µA), and LPM4.5 (shutdown, 0.18 µA) - all measured at 3 V. In LPM4.5, only the RTC and tamper-detection circuitry remain active, allowing >10 years of battery-backed timekeeping and event logging during AC mains failure. The MSP430F67471AIPZR achieves this via selective power gating of analog and digital domains while retaining SRAM retention.

Which communication interfaces are available on the MSP430F67471AIPZR for smart meter connectivity?

The MSP430F67471AIPZR provides six enhanced Universal Serial Communication Interfaces (eUSCIs): four eUSCI_A modules (supporting UART, IrDA, and SPI) and two eUSCI_B modules (supporting SPI and I2C). This enables concurrent connectivity to optical ports (UART), RF modules (SPI), and on-board sensors (I2C), all without external level shifters or protocol translators. The MSP430F67471AIPZR's eUSCI peripherals are clocked independently and support automatic baud-rate detection for legacy AMR systems.