Texas Instruments MSP430F67761IPZ

Overview

MSP430F67761IPZ from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase electronic watt-hour meters. It integrates seven 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 256KB flash/16KB RAM, LCD controller (320 segments), and real-time clock with tamper protection - enabling <0.1% energy measurement accuracy over 2000:1 dynamic range in utility metering applications.

For engineers reviewing the MSP430F67761IPZ datasheet, MSP430F67761IPZ pinout, MSP430F67761IPZ application, or MSP430F67761IPZ equivalent, key selection considerations include its 100-pin LQFP (PZ) package, 62 I/O count, support for ANSI C12.20 and IEC 62053 compliance, four-quadrant power measurement per phase, and ultra-low-power RTC mode (0.34 µA at 3 V).

Technical Context

The MSP430F67761IPZ implements a dedicated metering subsystem with seven independent SD24_B sigma-delta modulators for simultaneous voltage/current sampling across three phases plus neutral. Its analog front-end supports current transformers, Rogowski coils, and shunt sensors, with digital phase correction and temperature-compensated energy calculation firmware pre-integrated.

It executes TI's certified energy measurement software library on a low-power MSP430 CPU core, delivering calibrated active/reactive energy, RMS values, harmonics, and tariff management without external co-processors. Communication is handled via six configurable eUSCI ports supporting UART, SPI, and I²C protocols for AMR/AMI module interfacing.

Key Specifications

Pinout & Package

The MSP430F67761IPZ is housed in a 100-pin LQFP (PZ) package with exposed thermal pad, optimized for industrial meter PCB layouts requiring EMI resilience and thermal stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67771IPZ, the MSP430F67761IPZ trades 16KB RAM for lower system cost and power; versus MSP430F67661IPZ, it adds one sigma-delta ADC channel and full neutral path support - making it optimal for new 3-phase+neutral meter designs requiring Class 0.2 accuracy and tamper resilience.

Availability

MSP430F67761IPZ is available at Aetrix Electronics and suitable for smart grid revenue metering, industrial energy monitoring, and AMI gateway interface applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for utility-certified designs.

Supply support for MSP430F67761IPZ 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 for industrial, automotive, and energy infrastructure markets.

The MSP430F67761IPZ belongs to TI's polyphase metering SoC product line, engineered specifically for revenue-grade electricity meters that must meet ANSI C12.20 and IEC 62053 metrology standards with minimal external components.

FAQ

What is the maximum dynamic range supported by the MSP430F67761IPZ for phase current measurement?

The MSP430F67761IPZ supports <0.1% accuracy over a 2000:1 dynamic range for phase current measurement, verified per TI's SLAS815D datasheet Section 1.1. This performance enables Class 0.2 compliance under ANSI C12.20 and IEC 62053-22 standards. The MSP430F67761IPZ achieves this using its seven 24-bit sigma-delta ADCs with programmable gain amplifiers and on-chip digital filtering - eliminating need for external signal conditioning in most meter topologies.

Does the MSP430F67761IPZ include hardware-based anti-tamper functionality?

Yes, the MSP430F67761IPZ integrates dedicated anti-tamper modules including RTC tamper detect pins (PJ.0–PJ.3), magnetic field sensing inputs, and secure password-protected register access. These features are documented in Section 4.2 and Section 5.42–5.45 of the SLAS815D datasheet. The MSP430F67761IPZ uses hardware-triggered event logging to record tamper attempts with timestamps - satisfying ANSI C12.22 security requirements for utility-grade meters.

What communication interfaces are available on the MSP430F67761IPZ?

The MSP430F67761IPZ provides six enhanced Universal Serial Communication Interfaces (eUSCI), configurable as four UARTs, six SPIs, or two I²C ports - all accessible via shared pins with programmable mapping. This flexibility is confirmed in Section 1.1 and Table 3-1 of SLAS815D. The MSP430F67761IPZ supports simultaneous use of UART for PLC modem, SPI for secure element, and I²C for environmental sensors - enabling full-featured AMI gateway integration without external bus expanders.

How does the MSP430F67761IPZ handle power supply failure during metering operation?

The MSP430F67761IPZ features automatic power supply switching between main VCC and auxiliary backup supplies (AUXVCC1–AUXVCC3), with hardware-controlled transition and retention of RTC, RAM, and tamper logs. Section 1.1 specifies 0.34 µA RTC current in LPM3.5 mode at 3 V. During AC mains failure, the MSP430F67761IPZ sustains metrology functions for >10 years on a single CR2032 battery - validated per TI application note SPRAAR7.

Is the MSP430F67761IPZ pin-compatible with other devices in the F677x1 family?

Yes, the MSP430F67761IPZ shares identical pinout and footprint with all 100-pin LQFP (PZ) variants in the F677x1 family, including MSP430F67791IPZ, MSP430F67771IPZ, and MSP430F67751IPZ - as confirmed in Table 3-1 and Figure 4-2 of SLAS815D. This allows hardware reuse across meter tiers; for example, upgrading from MSP430F67761IPZ to MSP430F67771IPZ requires only flash/RAM reprogramming - no PCB change.