Texas Instruments MSP430F67461IPZ

Overview

MSP430F67461IPZ 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, meets ANSI C12.20 and IEC 62053 standards, and operates from 1.8 V to 3.6 V.

For engineers reviewing the MSP430F67461IPZ datasheet, MSP430F67461IPZ pinout, MSP430F67461IPZ application, or MSP430F67461IPZ equivalent, key selection considerations include its 100-pin LQFP package, 256 KB flash/16 KB RAM configuration, four SD24_B ADC channels, support for current transformers and shunt sensors, and ultra-low standby current of 2.1 µA in LPM3 mode.

Technical Context

The MSP430F67461IPZ implements a dedicated metering architecture with independent 24-bit sigma-delta modulators per phase input, digital phase correction logic for CT-based current sensing, and hardware-accelerated energy calculation engines compliant with ANSI/IEC revenue metering standards. Its AFE includes programmable gain amplifiers and reference buffers optimized for high-precision voltage/current sampling.

It integrates TI's energy measurement software library for active/reactive power, RMS, harmonics, and tariff management, executed on the 32-bit multiplier-enhanced MSP430 core. Power management supports automatic supply switching between main and backup rails, with RTC operation at 0.34 µA in LPM3.5 and shutdown at 0.18 µA in LPM4.5.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67461IPZ, the IPZT variant offers identical metrology performance in tape-and-reel form for production lines, while the MSP430F67471IPZ provides double the RAM for advanced firmware features - both retain the same 100-pin LQFP footprint and metering accuracy.

Availability

MSP430F67461IPZ is available at Aetrix Electronics and suitable for smart grid revenue meters, industrial energy monitors, and AMI endpoint nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F67461IPZ 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 specializing in analog and embedded processing technologies, with leadership in low-power microcontrollers and precision metrology solutions.

The MSP430F674x1 product line is engineered specifically for cost-sensitive, high-accuracy polyphase electricity metering applications - integrating metrology-grade ADCs, RTC, LCD driver, and security features into a single SoC to minimize external components and system cost.

FAQ

What is the maximum number of 24-bit sigma-delta ADC channels supported by the MSP430F67461IPZ?

The MSP430F67461IPZ integrates four independent 24-bit sigma-delta ADCs (SD24_B). This configuration supports simultaneous sampling of three-phase voltage/current inputs plus neutral or alternative sensor configurations such as shunt-based current measurement. Each channel features differential inputs, programmable gain, and built-in digital filters - all directly accessible by the on-chip energy calculation engine without CPU intervention. The MSP430F67461IPZ does not support more than four SD24_B channels.

Does the MSP430F67461IPZ meet ANSI C12.20 and IEC 62053 certification requirements out of the box?

Yes, the MSP430F67461IPZ is designed to meet ANSI C12.20 Class 0.2 and IEC 62053-22/23 accuracy standards when implemented with proper external circuitry (e.g., precision resistors, matched CTs/shunts) and calibrated using TI's energy measurement software library. Its <0.1% error over 2000:1 dynamic range, temperature-compensated calculations, and digital phase correction are validated under standard test conditions defined in those specifications. Final meter-level certification requires system-level testing.

What is the standby current consumption of the MSP430F67461IPZ in LPM3 mode, and what peripherals remain active?

The MSP430F67461IPZ consumes 2.1 µA in LPM3 mode at 3 V. In this state, the real-time clock (RTC) continues running with crystal oscillator enabled, the RAM contents are retained, and the device wakes in less than 5 µs. The LCD controller, sigma-delta ADCs, and CPU are disabled. Auxiliary supplies (AUXVCC1–AUXVCC3) remain powered to support tamper detection and backup register retention - making it ideal for mains-failure scenarios in revenue meters.

How many GPIO pins are available on the MSP430F67461IPZ in its 100-pin LQFP package?

The MSP430F67461IPZ provides 62 general-purpose I/O pins in its 100-pin LQFP (PZ) package. These include multiplexed functions such as eUSCI UART/SPI/I²C, timer capture/compare, LCD segment/commons, ADC inputs, and tamper detection. All GPIOs support Schmitt-trigger inputs, configurable drive strength, and programmable pull-up/down resistors - enabling flexible interface design for meter peripherals like optical ports, pulse LEDs, and communication modules.

Can the MSP430F67461IPZ drive a 320-segment LCD display directly without external components?

Yes, the MSP430F67461IPZ includes an integrated LCD_C controller capable of driving up to 320 segments using eight commons (COM0–COM7) and 40 segment lines. It supports static, 2-, 3-, and 4-mux configurations with programmable contrast control and charge pump. No external LCD driver IC or bias resistors are required - the LCDCAP pin supports internal capacitor-based charge pump operation, simplifying BOM and layout for meter front-panel displays.