Texas Instruments MSP430F67691IPZR

Overview

MSP430F67691IPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring six 24-bit sigma-delta ADCs, 512KB flash, 32KB RAM, and <0.1% energy measurement accuracy over 2000:1 dynamic range. It integrates LCD controller (320 segments), RTC with temperature compensation, anti-tamper security modules, and supports ANSI C12.20 and IEC 62053 compliance in utility metering applications.

For engineers reviewing the MSP430F67691IPZR datasheet, MSP430F67691IPZR pinout, MSP430F67691IPZR application, or MSP430F67691IPZR equivalent, this page delivers verified technical context, package mapping, real-world use cases, and validated alternative options for revenue-grade smart meter design and certification.

Technical Context

The MSP430F67691IPZR implements a dedicated energy measurement architecture with six independent SD24_B sigma-delta modulators for phase A/B/C and neutral current/voltage sensing, each supporting differential inputs and programmable gain. Its 25-MHz CPU with 32-bit hardware multiplier executes TI's certified energy measurement library for active/reactive power, RMS, harmonics, and four-quadrant analysis.

It features dual auxiliary supply domains (AUXVCC1–AUXVCC3) enabling seamless backup during AC mains failure, ultra-low-power LPM3.5 mode (0.34 µA), and hardware-accelerated digital phase correction for CT-based current sensing - all within a single-chip solution eliminating external metrology ASICs.

Key Specifications

Pinout & Package

100-pin LQFP (PZ) package, 14 mm × 14 mm body size, 0.5 mm pitch, with 62 general-purpose I/O pins and dedicated metrology analog inputs (SDxP/N), RTC crystal terminals (XIN/XOUT), and auxiliary supply rails (AUXVCC1–AUXVCC3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67681IPZ, the MSP430F67691IPZR provides double the RAM for larger data logs and secure firmware partitions; compared with MSP430F67791IPZ, it trades one SD24_B channel for identical memory and metrology performance - optimizing cost while retaining full 3-phase+neutral compliance.

Availability

MSP430F67691IPZR is available at Aetrix Electronics and suitable for utility metering, industrial energy monitoring, and AMI endpoint designs requiring stable component supply, long-term lifecycle support, and traceable sourcing for global certification programs.

Supply support for MSP430F67691IPZR 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 low-power microcontrollers and precision metrology solutions.

The MSP430F67691IPZR belongs to TI's polyphase metering SoC product line, engineered specifically to replace discrete metrology signal chains with integrated, standards-compliant, ultra-low-power single-chip solutions for revenue-grade electricity meters.

FAQ

What is the maximum number of SD24_B ADC channels supported by the MSP430F67691IPZR?

The MSP430F67691IPZR integrates six independent 24-bit sigma-delta ADCs (SD24_B) optimized for metrology. This matches the device's designation in the F676x1 family and is confirmed in Table 3-1 of the SLAS815D datasheet. The MSP430F67691IPZR uses all six channels for full 3-phase + neutral current/voltage sensing, leaving no unused SD24_B resources. Each channel supports differential inputs, programmable gain, and built-in decimation filtering.

Does the MSP430F67691IPZR support IEC 62053-22 Class 0.2 accuracy out of the box?

Yes - the MSP430F67691IPZR achieves <0.1% energy measurement error over 2000:1 dynamic range, satisfying IEC 62053-22 Class 0.2 requirements. This is enabled by its six high-linearity SD24_B ADCs, on-chip digital phase correction, temperature-compensated reference, and TI's certified energy measurement software library. No external calibration components are needed to meet this grade.

What package type and pin count does the MSP430F67691IPZR use?

The MSP430F67691IPZR is packaged in a 100-pin LQFP (PZ) with 14 mm × 14 mm body size and 0.5 mm pitch. This is explicitly documented in the Device Information table (Section 1.3) and confirmed in Table 3-1 and Figure 4-2 of the SLAS815D datasheet. It provides 62 usable I/O pins, including dedicated metrology analog inputs, RTC crystal terminals, and auxiliary supply rails.

Can the MSP430F67691IPZR operate during AC mains failure?

Yes - the MSP430F67691IPZR supports uninterrupted operation during mains loss via three dedicated auxiliary supplies (AUXVCC1–AUXVCC3). In LPM3.5 mode, it draws only 0.34 µA at 3 V to maintain RTC, LCD, and critical metrology functions. Its ultra-low standby power (2.1 µA in LPM3) ensures >10-year battery backup life using standard coin cells or supercapacitors.

Which communication interfaces are available on the MSP430F67691IPZR for smart meter connectivity?

The MSP430F67691IPZR includes six enhanced USCI (eUSCI) modules configurable as UART, SPI, or I²C. Specifically, it supports up to four UARTs, six SPIs, and two I²C interfaces - enabling concurrent connections to PLC modems, RF transceivers, optical ports, and secure elements. All interfaces are accessible on the 100-pin PZ package with full pin remapping flexibility.