Texas Instruments MSP430F67481IPZ

Overview

MSP430F67481IPZ from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, integrating a 25-MHz ultra-low-power CPU, four 24-bit sigma-delta ADCs, LCD controller (320 segments), and real-time clock with temperature compensation. It delivers <0.1% energy measurement accuracy over 2000:1 dynamic range, supports ANSI C12.20 and IEC 62053 compliance, and operates across 3.6 V to 1.8 V supply with standby current as low as 2.1 µA.

For engineers reviewing the MSP430F67481IPZ datasheet, MSP430F67481IPZ pinout, MSP430F67481IPZ application, or MSP430F67481IPZ equivalent, key selection criteria include its 100-pin LQFP (PZ) package, 512 KB flash / 16 KB RAM memory configuration, SD24_B ADC channel count, RTC tamper detection capability, and support for shunt/CT/Rogowski sensor interfaces in utility-grade metering designs.

Technical Context

This device belongs to the MSP430F674x1 family - a subset of the F67xx1 polyphase metering SoCs optimized for cost-sensitive 3-phase revenue meters. It implements TI's dedicated energy measurement software library on-chip, enabling tariff management, four-quadrant power calculation, and digital phase correction without external co-processors.

The architecture integrates seven independent analog front-end channels (four SD24_B + one system 10-bit ADC), six eUSCI ports configurable as UART/SPI/I²C, and hardware-accelerated energy computation blocks. Its auxiliary supply subsystem (AUXVCC1–AUXVCC3) enables seamless backup during AC mains failure while maintaining RTC and critical registers in LPM3.5 mode (0.34 µA).

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, 0.5 mm pitch. Pin mapping validated per TI SLAS815D Rev. September 2018, Section 4.1 (Figure 4-2) and Table 4-2 (Terminal Functions – PZ Package).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67481IPZ, MSP430F67471IPZ trades flash for RAM headroom in fixed-function meters, while MSP430F67681IPZ adds two SD24_B channels at identical memory size - making it preferable for future-proofed designs requiring expanded analog sensing without layout change.

Availability

MSP430F67481IPZ is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade energy monitors, AMI gateway nodes, and tamper-resistant meter modules requiring stable component supply across multi-year utility deployments.

Supply support for MSP430F67481IPZ 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 for industrial, automotive, and consumer markets since 1930.

The MSP430F674x1 series is part of TI's ultra-low-power metering SoC portfolio, engineered specifically for ANSI/IEC-compliant 3-phase revenue meters with integrated metrology, security, and human-machine interface functions.

FAQ

What is the maximum number of SD24_B ADC channels supported by the MSP430F67481IPZ?

The MSP430F67481IPZ integrates four independent 24-bit sigma-delta ADCs (SD24_B) - sufficient for simultaneous sampling of three-phase currents and neutral current, or three-phase voltages and one auxiliary channel. This matches the device's designation in the F674x1 family, which specifies four SD24_B converters versus six in F676x1 or seven in F677x1 variants. The MSP430F67481IPZ does not support more than four SD24_B channels.

Does the MSP430F67481IPZ support password-protected RTC access?

Yes, the MSP430F67481IPZ includes hardware-enforced password protection for its real-time clock module. Access to RTC registers requires correct 32-bit password entry via the RTCPSW register; incorrect attempts lock the module until reset. This feature is documented in Section 6.13.4 of the SLAS815D datasheet and applies directly to the MSP430F67481IPZ as a member of the F674x1 family.

What is the standby current consumption of the MSP430F67481IPZ in LPM3 mode?

The MSP430F67481IPZ consumes 2.1 µA in LPM3 mode at 3 V, as specified in Section 5.5 of the SLAS815D datasheet. This includes active ACLK (32.768 kHz), RTC, and RAM retention - enabling extended battery life in backup operation. Measured under recommended operating conditions with all peripherals disabled except essential clock systems.

Can the MSP430F67481IPZ drive a 320-segment LCD display directly?

Yes, the MSP430F67481IPZ features an integrated LCD_C peripheral supporting up to 320 segments using 8 commons (COM0–COM7) and 40 segment lines. It includes programmable contrast control, charge pump, and static/multiplex modes - eliminating need for external LCD drivers. This capability is confirmed in Section 1.1 Features and Section 5.46–5.47 of the SLAS815D datasheet.

Which communication interfaces are available on the MSP430F67481IPZ for AMR/AMI implementation?

The MSP430F67481IPZ provides six enhanced Universal Serial Communication Interfaces (eUSCI), configurable as up to four UARTs, six SPIs, or two I²C ports. This allows concurrent implementation of PLC (via UART + SPI), RF (via UART), and optical port (via UART) - meeting typical AMR/AMI stack requirements. All eUSCI modules support automatic baud-rate detection and deep FIFOs per TI documentation.