Texas Instruments MSP430F67461AIPEU

Overview

MSP430F67461AIPEU 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, 256KB flash, 16KB RAM, LCD controller (320 segments), and six eUSCI interfaces (4 UART/IrDA/SPI + 2 SPI/I²C). It meets ANSI C12.20 and IEC 62053 standards and supports shunt/CT/Rogowski sensor inputs for phase current measurement with <0.1% error over 2000:1 dynamic range.

For engineers reviewing the MSP430F67461AIPEU datasheet, MSP430F67461AIPEU pinout, MSP430F67461AIPEU application, or MSP430F67461AIPEU equivalent, key selection criteria include its 128-pin LQFP package with 90 GPIOs, ultra-low-power RTC mode (0.34 µA), dedicated pulse outputs for active/reactive energy calibration, digital phase correction, and support for 40–70 Hz line frequency with single-point calibration.

Technical Context

The MSP430F67461AIPEU implements a metrology-optimized architecture with four SD24_B sigma-delta modulators feeding dedicated metrology processing paths, enabling simultaneous voltage/current sampling across up to three phases plus neutral. Its 25-MHz CPU with 32-bit hardware multiplier executes TI's Energy Measurement Library for real-time kWh, kVARh, RMS, and power factor calculation.

Power management includes five low-power modes (LPM0–LPM4.5), with LPM3.5 (RTC active) drawing just 0.34 µA and LPM4.5 (shutdown) consuming 0.18 µA - critical for battery-backed meter operation during AC mains failure. The device uses separate analog (AVCC/AVSS) and digital (DVCC/DVSS) supply domains with internal regulators and auxiliary supplies (AUXVCC1–3) for ADC reference stability.

Key Specifications

Pinout & Package

128-pin LQFP (PEU) package, 20 mm × 14 mm body size, 0.5 mm pitch. Requires external connection between VDSYS1–VDSYS2 and VASYS1–VASYS2 pairs for proper internal regulator operation. LCDCAP/R33 must be tied to DVSS if unused.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67461AIPEU, the MSP430F67471AIPEU offers double RAM for complex firmware but identical metrology capability, while the MSP430F67661AIPEU adds two sigma-delta channels for expanded sensor count - neither is pin-compatible due to differing SD24_B pin allocations in the PEU package.

Availability

MSP430F67461AIPEU is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade submeters, grid edge monitoring nodes, and anti-tamper utility meters requiring stable component supply and long-term industrial lifecycle support.

Supply support for MSP430F67461AIPEU 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The MSP430F67xx1A family is part of TI's Metrology and Monitoring MCU portfolio, engineered specifically for revenue-grade energy measurement in smart grid infrastructure - emphasizing metrology accuracy, ultra-low-power RTC operation, and integrated anti-tamper security.

FAQ

What is the maximum number of differential voltage/current channels supported by the MSP430F67461AIPEU?

The MSP430F67461AIPEU integrates four independent 24-bit sigma-delta ADC modules (SD24_B), each supporting one differential input pair. This enables simultaneous measurement of up to four differential signals - typically configured for three phase voltages and neutral current, or two phase currents and two phase voltages. The device does not support more than four SD24_B channels, and no additional ADC resources are available beyond these four.

Does the MSP430F67461AIPEU support direct connection to current transformers (CTs) without external signal conditioning?

Yes, the MSP430F67461AIPEU supports direct CT interfacing via its SD24_B modulators, which accept ±2.5 V differential inputs and include programmable gain amplifiers (PGA) with gains up to 32×. Its built-in digital phase correction compensates for CT phase lag, eliminating the need for external RC compensation networks. However, a burden resistor and anti-aliasing filter are still required on the CT secondary side per IEC 61869-2.

What low-power modes are available on the MSP430F67461AIPEU, and what is the lowest current draw with RTC active?

The MSP430F67461AIPEU supports five low-power modes (LPM0–LPM4.5). In LPM3.5 - where the real-time clock remains active while CPU and most peripherals are disabled - it draws only 0.34 µA at 3 V. This mode retains RAM contents and enables wake-up via RTC alarm or external interrupt, making it ideal for battery-backed meter timekeeping during AC mains failure.

How does the MSP430F67461AIPEU meet ANSI C12.20 and IEC 62053 standards for revenue-grade metering?

The MSP430F67461AIPEU achieves <0.1% measurement error over 2000:1 dynamic range under specified conditions (40–70 Hz, –25°C to +60°C), satisfying ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S requirements. Its on-chip temperature compensation, digital phase correction, and factory-trimmed reference ensure stability across environmental variations - validated using TI's Energy Measurement Design Center (EMDC) calibration workflow.

Can the MSP430F67461AIPEU drive a 320-segment LCD directly, and what contrast control options are available?

Yes, the MSP430F67461AIPEU includes an integrated LCD_C peripheral supporting up to 320 segments (8 commons × 40 segments) with internal charge pump and software-controllable bias voltage (VLCD). Contrast is adjusted dynamically via register-controlled VLCD levels and frame frequency tuning (fFRAME,4mux/fFRAME,8mux), enabling optimal readability across temperature and battery voltage ranges without external components.