Texas Instruments MSP430F67661AIPZ

Overview

MSP430F67661AIPZ from Texas Instruments is a polyphase metering SoC designed for high-accuracy energy measurement in 3-phase utility meters. It integrates six 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 256KB flash, 16KB RAM, LCD controller (320 segments), and dual eUSCI modules supporting UART/IrDA/SPI/I²C. It meets ANSI C12.20 and IEC 62053 standards for revenue-grade metering.

For engineers reviewing the MSP430F67661AIPZ datasheet, MSP430F67661AIPZ pinout, MSP430F67661AIPZ application, or MSP430F67661AIPZ equivalent, key selection criteria include its 0.1% accuracy over 2000:1 dynamic range, RTC with tamper detection, ultra-low-power LPM3.5 mode (0.34 µA), and support for current transformers, Rogowski coils, and shunt sensors in 3-phase 4-wire star configurations.

Technical Context

The MSP430F67661AIPZ implements a dedicated metrology subsystem with six independent SD24_B sigma-delta modulators-each with differential inputs, programmable gain, and digital filtering-feeding into a real-time energy calculation engine. Its CPU executes TI's Energy Measurement Software Library to compute active/reactive power, RMS voltage/current, phase angle, and cumulative kWh/kVARh per phase.

It features dual power domains (AVCC/DVCC), separate analog and digital supply pins (VASYS/VCORE), and hardware-accelerated metrology peripherals including pulse output generators for calibration, 4-quadrant energy accumulation logic, and digital phase correction for CT-based current sensing-all operating within a 40–70 Hz line frequency range using single-point calibration.

Key Specifications

Pinout & Package

The MSP430F67661AIPZ is housed in a 100-pin LQFP (PZ) package measuring 14 mm × 14 mm, with 62 general-purpose I/O pins, dedicated metrology analog inputs (SDxP/N), RTC crystal terminals (XIN/XOUT), LCD segment/common drivers (COM0–COM7, S0–S63), and dual power domains (AVCC/AVSS, DVCC/DVSS, VASYS/VCORE).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67661AIPEU, the MSP430F67661AIPZ reduces board area by 30% and lowers BOM cost via fewer passive components, while matching metrology performance; versus MSP430F67671AIPZ, it trades 16KB RAM for lower system power in space-constrained meters where firmware size is optimized.

Availability

MSP430F67661AIPZ is available at Aetrix Electronics and suitable for 3-phase electronic watt-hour meters, smart grid distribution monitors, and prepayment energy gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F67661AIPZ 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 delivering analog and embedded processing solutions, with leadership in low-power microcontrollers and precision metrology ICs.

The MSP430F67661AIPZ belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for revenue-grade energy measurement in utility, industrial, and commercial metering applications where accuracy, security, and ultra-low-power operation are mandatory.

FAQ

What is the maximum number of independent current measurement channels supported by the MSP430F67661AIPZ?

The MSP430F67661AIPZ integrates six independent 24-bit sigma-delta ADC channels (SD0–SD5), each with differential inputs and programmable gain. This enables simultaneous high-accuracy current sampling for three phases, neutral, and auxiliary monitoring paths-fully satisfying ANSI C12.20 and IEC 62053-22 requirements for 3-phase 4-wire metering. The MSP430F67661AIPZ does not support a seventh channel, unlike higher-tier F677x1A variants.

Does the MSP430F67661AIPZ include hardware support for pulse output generation used in meter calibration?

Yes, the MSP430F67661AIPZ includes dedicated hardware pulse output generators for both active and reactive energy. These outputs are driven directly by the metrology engine-bypassing CPU intervention-to ensure jitter-free, metrology-grade timing accuracy required for calibration compliance. Pulse widths and frequencies are configurable via registers, and outputs can drive LEDs or optocouplers directly, as confirmed in the SLAS983A datasheet Section 1.1 and Figure 1-1.

What low-power modes are available on the MSP430F67661AIPZ, and what is the current draw in RTC-only operation?

The MSP430F67661AIPZ supports LPM3.5 (RTC mode) with a typical current draw of 0.34 µA at 3 V, retaining RTC, RAM, and selected registers while disabling the CPU and main clocks. This enables multi-year battery operation during AC mains failure. Additional modes include LPM3 (standby, 2.1 µA) and LPM4.5 (shutdown, 0.18 µA). All values are specified in SLAS983A Section 5.5 and validated across temperature.

Can the MSP430F67661AIPZ operate across the full 40–70 Hz line frequency range without recalibration?

Yes, the MSP430F67661AIPZ is designed to maintain <0.1% energy accuracy across 40–70 Hz using a single factory calibration point, as stated in the SLAS983A datasheet Section 1.1. This is achieved through adaptive digital filtering and automatic line frequency tracking in the SD24_B modulators-eliminating the need for per-frequency calibration tables or user intervention during operation.

Is the MSP430F67661AIPZ pin-compatible with other devices in the MSP430F676x1A family?

Yes, all MSP430F676x1A variants in the 100-pin PZ package-including MSP430F67651AIPZ, MSP430F67671AIPZ, and MSP430F67681AIPZ-are pin-compatible with the MSP430F67661AIPZ. They share identical pinouts, power domains, and peripheral mappings; differences are limited to flash/RAM size and SD24_B channel count, making them drop-in replacements for design scalability.