Texas Instruments MSP430F67461AIPEUR

Overview

MSP430F67461AIPEUR from Texas Instruments is a polyphase metering SoC designed for high-accuracy energy measurement in 3-phase utility meters. It integrates four independent 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 256KB flash, 16KB RAM, and an LCD controller supporting up to 320 segments - enabling ANSI C12.20 and IEC 62053-compliant metering with <0.1% accuracy over 2000:1 dynamic range.

For engineers reviewing the MSP430F67461AIPEUR datasheet, MSP430F67461AIPEUR pinout, MSP430F67461AIPEUR application, or MSP430F67461AIPEUR equivalent, key selection considerations include its 128-pin LQFP (PEU) package with 90 GPIOs, ultra-low-power RTC mode (0.34 µA), dedicated pulse output pins for active/reactive energy calibration, and support for current transformers, Rogowski coils, and shunt sensors in 3-phase 4-wire star configurations.

Technical Context

The MSP430F67461AIPEUR implements a metrology-optimized architecture with seven configurable SD24_B modulator channels (four active in this variant), dual ADC subsystems (24-bit sigma-delta + 10-bit SAR), and hardware-accelerated energy calculation engines. Its real-time clock includes tamper detection, crystal offset calibration, and temperature compensation - all operating in LPM3.5 at 0.34 µA.

Digital peripherals include four eUSCI_A modules (UART/IrDA/SPI) and two eUSCI_B modules (SPI/I²C), three-channel DMA, 16-bit CRC, and four 16-bit timers with nine capture/compare registers. Power management supports automatic switching between AC mains and backup supply, with LCD operation drawing only 3 µA during mains failure.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, with exposed thermal pad (not electrically connected). Pin functions follow TI's default multiplexing mapping per SLAS983A Rev. September 2018.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67461AIPEUR, the MSP430F67461AIPZ offers smaller footprint but sacrifices neutral current measurement capability and LCD expansion; the MSP430F67661AIPEUR adds a fifth and sixth SD24_B channel for auxiliary metrology paths without changing layout or power budget.

Availability

MSP430F67461AIPEUR is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade energy monitors, AMI endpoint nodes, and tamper-resistant utility meters requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F67461AIPEUR 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 leadership in metrology ICs and smart grid solutions.

The MSP430F67xx1A product line was engineered specifically for ANSI/IEC-compliant polyphase metering, integrating metrology-grade ADCs, secure RTC, and ultra-low-power operation to minimize bill-of-materials and simplify certification.

FAQ

What is the maximum number of independent analog input channels supported by the MSP430F67461AIPEUR?

The MSP430F67461AIPEUR supports four independent 24-bit sigma-delta ADC input channels (SD0–SD3), each with differential inputs and programmable gain. These are mapped to dedicated pins SD0P0/SD0N0 through SD3P0/SD3N0 and are used for simultaneous voltage and current sampling across three phases and neutral in 3-phase 4-wire metering topologies. The device does not support more than four SD24_B channels.

Does the MSP430F67461AIPEUR include hardware acceleration for energy calculations?

Yes, the MSP430F67461AIPEUR integrates dedicated hardware accelerators within its SD24_B module and CPU subsystem to perform real-time active/reactive/apparent energy calculations, RMS computations, and harmonic analysis. Its 25-MHz CPU with 32-bit hardware multiplier executes the Energy Measurement Software Library (EMSL) efficiently - eliminating need for external DSPs in Class 0.2 meter designs.

Can the MSP430F67461AIPEUR operate from a single 3.3-V supply without external regulators?

Yes, the MSP430F67461AIPEUR operates across 1.8 V to 3.6 V, making it compatible with standard 3.3-V LDOs. Its internal power-management module (PMM) automatically manages core (VCORE), analog (AVCC/AVSS), and LCD (DVCC) domains. No external regulators are required if the 3.3-V rail is well-filtered and meets ripple specifications (<10 mVpp) per SLAS983A Section 5.11.

How does the MSP430F67461AIPEUR handle tamper detection and secure timekeeping?

The MSP430F67461AIPEUR features password-protected RTC with dedicated tamper-detect pins (e.g., RTCCLK, RST/NMI), crystal offset calibration, and temperature compensation. Tamper events trigger immediate secure memory wipe and log entry in the TLV area. The RTC continues running in LPM3.5 at 0.34 µA - ensuring time integrity even during extended AC mains failure.

Is the MSP430F67461AIPEUR pin-compatible with other devices in the MSP430F674x1A family?

Yes, all MSP430F674x1A variants in the 128-pin PEU package - including MSP430F67451AIPEUR, MSP430F67471AIPEUR, and MSP430F67461AIPEUR - share identical pinouts and mechanical footprint. Differences are limited to flash/RAM size and enabled SD24_B channels, allowing drop-in replacement during design iteration or volume optimization.