Texas Instruments MSP430F67491AIPZR

Overview

MSP430F67491AIPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four independent 24-bit sigma-delta ADCs with <0.1% accuracy over 2000:1 dynamic range, integrated LCD controller (320 segments), and ultra-low-power RTC mode (0.34 µA at 3 V). It supports ANSI C12.20 and IEC 62053 compliance in utility metering applications.

For engineers reviewing the MSP430F67491AIPZR datasheet, MSP430F67491AIPZR pinout, MSP430F67491AIPZR application, or MSP430F67491AIPZR equivalent, key selection criteria include its 4-channel SD24_B ADC configuration, 512KB flash/32KB RAM memory layout, 128-pin LQFP (PEU) package with 90 GPIOs, and support for multiple sensor types (CTs, Rogowski coils, shunts) in energy measurement systems.

Technical Context

The MSP430F67491AIPZR implements a dedicated metrology subsystem with four 24-bit sigma-delta modulators feeding into a high-precision digital signal processing engine, enabling exact phase-angle and 4-quadrant power measurements per phase. Its analog front-end includes programmable gain and digital phase correction for current transformers.

Digital resources include a 25-MHz CPU with 32-bit hardware multiplier, three-channel DMA, four 16-bit timers (nine capture/compare registers), six eUSCI modules (four UART/IrDA/SPI + two SPI/I²C), and tamper-protected RTC with crystal offset calibration and temperature compensation.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch, with 90 general-purpose I/O pins and dedicated metrology analog inputs (SDxP/N, VREF, AVSS/AVCC).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67481AIPZR, the MSP430F67491AIPZR provides double the RAM for complex tariff engines and secure boot; versus MSP430F67691AIPZR, it trades two SD24_B channels for lower power and cost in standard 3-phase metering without neutral monitoring.

Availability

MSP430F67491AIPZR is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade energy monitors, grid edge sensor nodes, and tamper-resistant meter modules requiring stable component supply and long-term industrial lifecycle support.

Supply support for MSP430F67491AIPZR 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 and embedded processing technologies, with decades of expertise in metrology, low-power design, and industrial-grade reliability.

The MSP430F67491AIPZR belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for ANSI/IEC-compliant energy measurement in utility and building automation systems - emphasizing accuracy, security, and ultra-low-power operation.

FAQ

What is the primary metrology function of the MSP430F67491AIPZR?

The MSP430F67491AIPZR serves as a complete polyphase metering SoC with four independent 24-bit sigma-delta ADCs optimized for simultaneous voltage and current sampling across three phases. It performs real-time active/reactive/apparent energy calculation, harmonic analysis, and pulse generation - all compliant with ANSI C12.20 and IEC 62053 standards. The MSP430F67491AIPZR integrates the entire signal chain from analog front-end to secure firmware execution.

Does the MSP430F67491AIPZR support 50 Hz and 60 Hz line frequencies without recalibration?

Yes, the MSP430F67491AIPZR supports 40–70 Hz line frequency range using a single calibration profile, eliminating the need for separate firmware variants or field recalibration when deployed globally. Its adaptive digital filters and automatic line frequency detection ensure consistent <0.1% accuracy across both 50 Hz (Europe/Asia) and 60 Hz (North America) grids. This capability is built into the MSP430F67491AIPZR's metrology engine firmware.

How many LCD segments does the MSP430F67491AIPZR drive, and what interface does it use?

The MSP430F67491AIPZR integrates an LCD controller supporting up to 320 segments using static or multiplexed (up to 1:8 bias) drive schemes. It provides eight COM outputs (COM0–COM7) and dedicated segment drivers with programmable contrast control - removing the need for external LCD bias generators or driver ICs. This feature is natively implemented in the MSP430F67491AIPZR's LCDC module.

What security features are included in the MSP430F67491AIPZR for tamper protection?

The MSP430F67491AIPZR includes password-protected RTC with tamper detection on dedicated pins, hardware AES acceleration for firmware encryption, and internal monitoring of supply voltage, temperature, and clock anomalies. It also supports secure boot and flash write protection - meeting IEC 62053-31 requirements for physical and logical tamper resistance. These capabilities are embedded in the MSP430F67491AIPZR's security subsystem.

Is the MSP430F67491AIPZR pin-compatible with other devices in the F67xx1A family?

Yes, the MSP430F67491AIPZR in the 128-pin LQFP (PEU) package shares identical pinout and footprint with all other F67xx1A variants in the same package, including MSP430F67691AIPZR and MSP430F67791AIPZR. This allows hardware reuse across meter tiers - for example, upgrading from 4- to 7-channel ADC capability without PCB redesign. Pin compatibility is guaranteed per TI's SLAS983A datasheet for the PEU variant.