Texas Instruments MSP430F67491IPZR

Overview

MSP430F67491IPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, integrating a 25-MHz ultra-low-power MCU, four 24-bit sigma-delta ADCs, LCD controller (320 segments), RTC with temperature compensation, and dual auxiliary supply support. 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 MSP430F67491IPZR datasheet, MSP430F67491IPZR pinout, MSP430F67491IPZR application, or MSP430F67491IPZR equivalent, key selection criteria include its 4-channel SD24_B ADC configuration, 512KB flash/32KB RAM memory layout, 128-pin LQFP package with 90 GPIOs, and support for three-phase + neutral power measurement in utility-grade revenue meters.

Technical Context

The MSP430F67491IPZR implements TI's dedicated energy measurement architecture with four independent 24-bit sigma-delta modulators feeding dedicated digital filters, enabling simultaneous phase current and voltage sampling with exact phase angle calculation and digital CT phase correction. Its system-level integration includes an on-chip 10-bit ADC for auxiliary sensing, programmable eUSCI modules (4 UART / 6 SPI / 2 I²C), and hardware-accelerated energy computation via the TI Energy Measurement Library.

It operates across 1.8–3.6 V supply, supports 40–70 Hz line frequency with single-point calibration, and features five low-power modes - including LPM3.5 (0.34 µA) and LPM4.5 (0.18 µA) - optimized for battery-backed operation during AC mains failure while retaining RTC and critical data in backup RAM.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67481IPZR, the MSP430F67491IPZR provides double the RAM for advanced tariff management and larger calibration datasets; compared with MSP430F67691IPZR, it trades two SD24_B channels for lower BOM cost and simplified analog front-end design in standard 3-phase 4-wire deployments.

Availability

MSP430F67491IPZR is available at Aetrix Electronics and suitable for smart utility metering, revenue-grade energy monitoring, and grid-tied renewable energy metering requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F67491IPZR 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 specializing in analog and embedded processing technologies, with leadership in ultra-low-power microcontrollers and precision metrology solutions.

The MSP430F674x1 product line is engineered specifically for polyphase revenue metering applications, combining high-accuracy sigma-delta ADCs, secure real-time clock, and integrated LCD driver to minimize external components and reduce system cost.

FAQ

What is the maximum number of SD24_B ADC channels supported by the MSP430F67491IPZR?

The MSP430F67491IPZR integrates exactly four independent 24-bit sigma-delta ADCs (SD24_B), each with differential inputs and programmable gain. This configuration is confirmed in the Device Comparison table (Table 3-1) and matches the "4" entry under SD24_B CONVERTERS for MSP430F67491IPEU/IPZ variants. The MSP430F67491IPZR uses the 128-pin LQFP package, which routes all four SD24_B channel pairs (SD0–SD3) to dedicated analog input pins.

Does the MSP430F67491IPZR support ANSI C12.20 and IEC 62053 compliance out of the box?

Yes, the MSP430F67491IPZR is explicitly specified to meet or exceed ANSI C12.20 and IEC 62053 standards for accuracy and performance, as stated in Section 1.1 Features of the SLAS815D datasheet. Its <0.1% error over 2000:1 dynamic range, four-quadrant measurement capability, and digital phase correction ensure compliance when implemented with calibrated external sensors and proper PCB layout.

What is the standby current consumption of the MSP430F67491IPZR in LPM3 mode?

The MSP430F67491IPZR consumes 2.1 µA at 3 V in Standby Mode (LPM3), as documented in Section 1.1 Features. This current includes active RTC operation and retention of RAM contents, with wake-up latency under 5 µs - enabling rapid response to metering interrupts while maintaining multi-year battery life in backup operation.

Which package variant corresponds to the MSP430F67491IPZR part number?

The "PZ" suffix in MSP430F67491IPZR denotes the 100-pin LQFP package (PZ), with 62 I/O pins and 14 mm × 14 mm body size. This is confirmed in the Device Information table and Table 3-1, where MSP430F67491IPZ is listed alongside "100 PZ" under PACKAGE. The "R" suffix indicates tape-and-reel packaging for automated assembly.

Can the MSP430F67491IPZR drive a 320-segment LCD display directly?

Yes, the MSP430F67491IPZR includes an integrated LCD_C peripheral that supports up to 320 segments using 8 commons (COM0–COM7) and 40 segments per common. It provides programmable contrast control, internal charge pump, and software-configurable bias and frame frequency - eliminating the need for external LCD drivers in utility meter displays.