Texas Instruments MSP430F67651IPZ

Overview

MSP430F67651IPZ from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring six 24-bit sigma-delta ADCs, 128KB flash, 16KB RAM, and support for ANSI C12.20/IEC 62053 compliance in utility revenue metering applications.

For engineers reviewing the MSP430F67651IPZ datasheet, MSP430F67651IPZ pinout, MSP430F67651IPZ application, or MSP430F67651IPZ equivalent, key selection criteria include its 100-pin LQFP (PZ) package, ultra-low-power LPM3.5 mode (0.34 µA), LCD driver for 320 segments, dedicated pulse outputs for active/reactive energy calibration, and integrated security modules for anti-tamper protection.

Technical Context

The MSP430F67651IPZ implements a 25-MHz CPU with 32-bit hardware multiplier to execute TI's energy measurement software library, performing real-time four-quadrant power calculations across three phases plus neutral. Its analog front end integrates six independent SD24_B sigma-delta modulators with differential inputs, programmable gain, and digital phase correction for current transformers.

It supports flexible power architecture with automatic switching between main and backup supplies, enabling <3 µA RTC operation during AC mains failure. Communication is handled via six eUSCI ports configurable as UART, SPI, or I²C - including dedicated interfaces for AMR/AMI modules - while tamper detection and password-protected RTC provide secure timekeeping and event logging.

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 MSP430F67661IPZ, the MSP430F67651IPZ offers optimized cost for basic ANSI/IEC-compliant meters with fixed firmware, while MSP430F67651IPZT provides identical functionality in production-ready packaging - both retain full pin compatibility and software interoperability.

Availability

MSP430F67651IPZ is available at Aetrix Electronics and suitable for smart grid revenue metering, industrial energy monitoring, and AMI gateway interface applications requiring stable component supply and long-term lifecycle assurance.

Supply support for MSP430F67651IPZ 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 delivering analog, embedded processing, and connectivity solutions with focus on reliability, efficiency, and system-level innovation.

The MSP430F676x1 product line targets utility-grade polyphase metering, integrating metrology-grade ADCs, secure real-time processing, and low-power design to replace discrete metering subsystems with single-chip solutions.

FAQ

What is the maximum number of independent analog input channels supported by the MSP430F67651IPZ?

The MSP430F67651IPZ integrates six independent 24-bit sigma-delta modulators (SD24_B), each with differential inputs - supporting up to six simultaneous analog measurement channels. These are mapped to dedicated SDxP0/SDxN0 pins and are used for voltage/current sensing across three phases and neutral in polyphase metering applications. The device does not include additional SAR or other ADC types beyond these six SD24_B channels.

Does the MSP430F67651IPZ support hardware-accelerated energy calculation algorithms?

Yes, the MSP430F67651IPZ executes TI's certified energy measurement software library in firmware, leveraging its 25-MHz CPU and integrated 32-bit hardware multiplier to compute active, reactive, and apparent energy, RMS voltage/current, power factor, and harmonics in real time. This eliminates need for external DSPs or FPGAs in Class 0.2/0.5S meter designs.

What is the function of the RTCCAP0 and RTCCAP1 pins on the MSP430F67651IPZ?

The RTCCAP0 and RTCCAP1 pins on the MSP430F67651IPZ connect external load capacitors (typically 12.5 pF each) to the 32.768 kHz crystal oscillator circuit. They stabilize the low-frequency RTC oscillator, enabling accurate timekeeping with ±2 ppm stability over –40°C to +85°C - critical for tariff-based billing and event logging in revenue meters.

Can the MSP430F67651IPZ drive a 320-segment LCD without external components?

Yes, the MSP430F67651IPZ includes an integrated LCD_C peripheral with charge-pump voltage generator and contrast control, capable of driving up to 320 segments (8 commons × 40 segments) directly. No external bias supply, resistors, or capacitors are required - simplifying BOM and PCB layout for Class 0.5S+ meter displays.

How does the MSP430F67651IPZ handle tamper detection and secure data retention?

The MSP430F67651IPZ features dedicated tamper detect pins with Schmitt-trigger inputs, hardware-enforced password-protected RTC, and secure memory regions. Upon tamper event (e.g., case open, magnetic field, power glitch), it triggers immediate secure erase of sensitive registers and logs timestamped events in backup RAM - all within sub-10 µs, meeting IEC 62053-31 anti-tamper requirements.