Texas Instruments MSP430F67651AIPZR

Overview

MSP430F67651AIPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, integrating six 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 128KB flash, 16KB RAM, LCD controller (320 segments), and dual eUSCI_A/B interfaces. It delivers <0.1% energy measurement accuracy over 2000:1 dynamic range and meets ANSI C12.20 and IEC 62053 standards.

For engineers reviewing the MSP430F67651AIPZR datasheet, MSP430F67651AIPZR pinout, MSP430F67651AIPZR application, or MSP430F67651AIPZR equivalent, key selection considerations include its 128-pin LQFP package, dedicated pulse output pins for active/reactive energy calibration, RTC with tamper detection, and ultra-low-power operation (0.18 µA in LPM4.5).

Technical Context

The MSP430F67651AIPZR implements a metrology-optimized architecture with seven independent SD24_B modulators (six active in this variant) supporting simultaneous voltage/current sampling across three phases plus neutral. Its analog front end includes programmable gain, digital phase correction for CTs, and temperature-compensated energy computation.

Digital subsystems include three-channel DMA, 16-bit CRC, four timers (nine capture/compare registers), and six eUSCI modules-four UART/IrDA/SPI-capable (eUSCI_A0–A3) and two SPI/I²C-capable (eUSCI_B0–B1)-enabling concurrent communication with metrology sensors, PLC modems, and display interfaces.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, 0.5 mm pitch, 90 GPIOs including 32 LCD segment lines and 8 common lines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67661AIPZR, the MSP430F67651AIPZR trades flash capacity for lower unit cost while retaining identical metrology performance and low-power behavior; versus MSP430F67651AIPZ, it provides 28 additional GPIOs and full LCD support-critical for feature-rich front-panel interfaces.

Availability

MSP430F67651AIPZR is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade submetering, and anti-tamper utility metering requiring stable component supply and long-term industrial lifecycle support.

Supply support for MSP430F67651AIPZR 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 over 50 years of innovation in energy measurement ICs.

The MSP430F67651AIPZR belongs to TI's Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy, low-power, standards-compliant electricity metering in utility and industrial applications.

FAQ

What is the maximum number of LCD segments supported by the MSP430F67651AIPZR?

The MSP430F67651AIPZR integrates an LCD controller supporting up to 320 segments with 8 commons (COM0–COM7). This is achieved using dedicated segment driver pins (e.g., P1.6/COM2, P5.x/Sxx) and internal charge pump. The full 320-segment capability requires the 128-pin LQFP package (PEU) - the 100-pin variant (PZ) supports fewer segments due to reduced I/O count. Designers must allocate segment/common pins per TI's LCD_C module mapping in the user's guide.

Does the MSP430F67651AIPZR support hardware-based energy pulse generation?

Yes, the MSP430F67651AIPZR includes dedicated hardware pulse output functionality for active and reactive energy. Pins such as P1.0/TA1.1 and P1.1/TA2.1 can be configured as pulse outputs synchronized to accumulated energy values, enabling direct calibration against reference meters without CPU involvement. Pulse width, frequency scaling, and quadrature mode are controlled via the SD24_B and Timer_A registers - no firmware polling or ISR overhead is required.

How does the MSP430F67651AIPZR achieve <0.1% accuracy over 2000:1 dynamic range?

The MSP430F67651AIPZR achieves <0.1% accuracy over 2000:1 dynamic range through a combination of six independent 24-bit sigma-delta ADCs with programmable gain amplifiers, on-chip digital phase correction for current transformers, temperature-compensated reference trimming, and factory-calibrated offset/gain coefficients stored in TLV memory. These features collectively suppress harmonic distortion, CT saturation effects, and thermal drift - all validated per ANSI C12.20 and IEC 62053 test procedures.

What communication interfaces are available on the MSP430F67651AIPZR for smart meter connectivity?

The MSP430F67651AIPZR provides six enhanced universal serial communication interfaces: four eUSCI_A modules (supporting UART, IrDA, and SPI) and two eUSCI_B modules (supporting SPI and I²C). Typical configurations include UART for optical port communication, SPI for PLC/HPLC modem interfacing, and I²C for EEPROM or environmental sensors. All interfaces operate concurrently and are independently clocked, eliminating bus contention in multi-protocol deployments.

Is the MSP430F67651AIPZR qualified for operation in extended temperature ranges?

Yes, the MSP430F67651AIPZR is specified for operation from –40°C to +85°C ambient temperature. Its metrology subsystem maintains <0.1% energy accuracy across this range via on-chip temperature sensing and factory-trimmed compensation coefficients applied in real time. The RTC module also includes temperature-compensated crystal oscillator calibration, ensuring ±2 ppm timekeeping stability over the full industrial temperature range.