Texas Instruments MSP430F67481IPZR

Overview

MSP430F67481IPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four 24-bit sigma-delta ADCs, 512KB flash, 16KB RAM, and support for ANSI C12.20 and IEC 62053 compliance in utility revenue metering applications.

For engineers reviewing the MSP430F67481IPZR datasheet, MSP430F67481IPZR pinout, MSP430F67481IPZR application, or MSP430F67481IPZR equivalent, key selection criteria include its 100-pin LQFP (PZ) package, ultra-low-power operation (0.18 µA in LPM4.5), integrated LCD controller (320 segments), and dedicated pulse outputs for active/reactive energy calibration.

Technical Context

The MSP430F67481IPZR implements a 25-MHz CPU with 32-bit hardware multiplier for real-time energy calculations and tariff management. Its analog front end integrates four independent SD24_B sigma-delta modulators with differential inputs and programmable gain, supporting current transformer, Rogowski coil, or shunt-based sensing across three phases plus neutral.

It features dual power domains (AVCC/DVCC), auxiliary supply switching (AUXVCC1–AUXVCC3), and a tamper-protected RTC with crystal offset calibration. Communication is handled via six eUSCI modules configurable as UART, SPI, or I²C - all operating independently of the main CPU during low-power modes.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, 0.5 mm pitch, with 62 general-purpose I/O pins and dedicated analog/digital power domains.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67471IPZ, the MSP430F67481IPZR offers double the flash for future firmware upgrades and secure bootloader expansion; compared with MSP430F67681IPZ, it trades two ADC channels for lower system cost while retaining full 3-phase metrology capability.

Availability

MSP430F67481IPZR is available at Aetrix Electronics and suitable for smart meter manufacturing, industrial energy monitoring systems, and AMI gateway development requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F67481IPZR 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 emphasis on reliability, power efficiency, and system-level integration.

The MSP430F674x1 product line is engineered specifically for revenue-grade polyphase metering, integrating metrology ADCs, low-power processing, and anti-tamper features to reduce bill-of-materials and accelerate certification to ANSI and IEC standards.

FAQ

What is the maximum number of independent sigma-delta ADC channels supported by the MSP430F67481IPZR?

The MSP430F67481IPZR integrates four independent 24-bit SD24_B sigma-delta modulators. Each channel supports differential inputs and programmable gain, enabling simultaneous sampling of phase A, B, C, and neutral currents or voltages. This configuration satisfies ANSI C12.20 and IEC 62053 requirements for 3-phase 4-wire metering without external ADCs. The MSP430F67481IPZR does not support more than four SD24_B channels.

Does the MSP430F67481IPZR support crystal oscillator calibration for the RTC?

Yes, the MSP430F67481IPZR includes password-protected RTC functionality with built-in crystal offset calibration. It measures and compensates for frequency deviation of the 32.768 kHz crystal due to aging and temperature effects, maintaining timekeeping accuracy within ±1 ppm over temperature. This feature is implemented in hardware and requires no host CPU intervention, ensuring robust operation in the MSP430F67481IPZR's LPM3.5 mode.

What low-power modes are available on the MSP430F67481IPZR, and what is the lowest achievable current draw?

The MSP430F67481IPZR supports multiple low-power modes including LPM3 (2.1 µA), LPM3.5 (0.34 µA), and LPM4.5 (0.18 µA) at 3 V. LPM4.5 disables all clocks and retains only RTC and backup RAM contents, making it ideal for extended mains-failure operation. All modes wake in less than 5 µs, preserving real-time responsiveness. These values are measured and specified in the SLAS815D datasheet for the MSP430F67481IPZR.

Can the MSP430F67481IPZR drive a 320-segment LCD directly without external components?

Yes, the MSP430F67481IPZR includes an integrated LCD_C peripheral supporting up to 320 segments with software-controllable contrast and internal charge pump. It drives common-electrode LCDs with up to 8 commons (COM0–COM7) and requires only external capacitors on LCDCAP and V2/V3 pins. No external bias generator or driver IC is needed, reducing BOM cost and board space in the MSP430F67481IPZR-based design.

Which communication interfaces are available on the MSP430F67481IPZR, and how are they configured?

The MSP430F67481IPZR provides six enhanced Universal Serial Communication Interfaces (eUSCI), configurable as UART, SPI, or I²C. Four eUSCI_A modules support UART/IrDA/SPI; two eUSCI_B modules support SPI/I²C. Configuration is done via register settings - no hardware pin strapping. All modules operate independently in low-power modes, allowing background communication while the CPU remains in LPM3. This flexibility supports HAN, WAN, and PLC interfaces in the MSP430F67481IPZR.