Texas Instruments MSP430F67481AIPZR

Overview

MSP430F67481AIPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, integrating seven 24-bit sigma-delta ADCs (four active in this variant), a 25-MHz CPU with 32-bit multiplier, 512KB flash, 16KB RAM, LCD controller (320 segments), and dual eUSCI_A/B interfaces. It delivers <0.1% energy measurement accuracy over 2000:1 dynamic range and meets ANSI C12.20 and IEC 62053 standards.

For engineers reviewing the MSP430F67481AIPZR datasheet, MSP430F67481AIPZR pinout, MSP430F67481AIPZR application, or MSP430F67481AIPZR equivalent, key selection criteria include its 128-pin LQFP package, four SD24_B ADC channels, RTC with tamper detection, ultra-low-power LPM3.5 mode (0.34 µA), and support for shunt/CT/Rogowski current sensing in utility-grade metering systems.

Technical Context

The MSP430F67481AIPZR implements a dedicated metrology subsystem with four independent 24-bit sigma-delta modulators (SD24_B) configured for phase A–C and neutral current/voltage sampling, paired with digital phase correction and temperature-compensated energy calculation firmware. Its 25-MHz CPU executes the Energy Measurement Software Library to compute active/reactive power, RMS, harmonics, and tariff-based kWh/kVArh values in real time.

Power management includes automatic supply switching between AC mains and backup battery, LCD operation at 3 µA in LPM3, and hardware-accelerated CRC-16 for firmware integrity. The device supports 40–70 Hz line frequency with single-point calibration and provides dedicated pulse output pins for active/reactive energy calibration traceability.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch, 90 GPIOs including 32 LCD segment lines and 8 common lines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67481AIPZR, MSP430F67471AIPZR trades flash capacity for RAM headroom in diagnostic-heavy deployments, while MSP430F67681AIPZR adds two metrology ADCs for sensor fusion-both retain pin compatibility, LPM3.5 current, and ANSI/IEC compliance.

Availability

MSP430F67481AIPZR is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade submetering, and AMI endpoint designs requiring stable component supply, long-term lifecycle support, and TI-qualified metrology performance.

Supply support for MSP430F67481AIPZR 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, embedded processing, and connectivity solutions with focus on reliability, precision, and low-power innovation.

The MSP430F67xx1A product line targets energy measurement and power monitoring applications, specifically engineered to integrate metrology accuracy, anti-tamper security, and ultra-low-power operation into single-chip utility meter SoCs.

FAQ

What is the ADC configuration of the MSP430F67481AIPZR?

The MSP430F67481AIPZR integrates four independent 24-bit sigma-delta ADCs (SD24_B) with differential inputs, programmable gain, and digital phase correction-optimized for simultaneous 3-phase current and neutral voltage sampling in revenue-grade meters. This matches the documented SD24_B channel count for F674x1A variants in Table 3-1 and supports ANSI C12.20 Class 0.2 accuracy.

Does the MSP430F67481AIPZR support RTC tamper detection?

Yes, the MSP430F67481AIPZR includes password-protected RTC with dedicated tamper detection pins, crystal offset calibration, and temperature compensation-features explicitly listed in Section 1.1 and validated in the device description for anti-tamper compliance in utility metering applications.

What package and pin count does the MSP430F67481AIPZR use?

The MSP430F67481AIPZR uses a 128-pin LQFP (PEU) package with 90 usable I/O pins, as confirmed in the Device Information table and Figure 4-1 pin diagram. This matches the "IPZR" suffix designation per TI's packaging nomenclature and enables full access to all metrology, communication, and LCD resources.

How does the MSP430F67481AIPZR achieve <0.1% measurement accuracy?

The MSP430F67481AIPZR achieves <0.1% accuracy over 2000:1 dynamic range through hardware-calibrated 24-bit sigma-delta ADCs, digital phase correction for CT errors, temperature-compensated energy computation, and single-point 40–70 Hz line frequency calibration-all specified in Section 1.1 and validated in metrology test reports referenced by TI.

Which communication interfaces are available on the MSP430F67481AIPZR?

The MSP430F67481AIPZR provides four eUSCI_A modules (UART/IrDA/SPI) and two eUSCI_B modules (SPI/I²C), supporting concurrent optical port (UART), PLC modem (SPI), and environmental sensor (I²C) connectivity-confirmed in Table 3-1 and Section 1.1 features, with full pin mapping in Figure 4-1.