Texas Instruments MSP430F6745AIPZR

Overview

MSP430F6745AIPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four independent 24-bit sigma-delta ADCs with <0.1% accuracy over 2000:1 dynamic range, integrated LCD controller (320 segments), AES-128 encryption, and ultra-low-power RTC mode (0.34 µA at 3 V). It supports ANSI C12.20 and IEC 62053 compliance in utility metering applications.

For engineers reviewing the MSP430F6745AIPZR datasheet, MSP430F6745AIPZR pinout, MSP430F6745AIPZR application, or MSP430F6745AIPZR equivalent, key selection criteria include phase-current metrology accuracy, multi-sensor interface support (CT/Rogowski/shunt), pulse output calibration capability, and low-power LCD operation during AC mains failure (3 µA in LPM3).

Technical Context

The MSP430F6745AIPZR integrates a 25-MHz CPU with 32-bit hardware multiplier for real-time energy calculations, seven peripheral modules including SD24_B (4-channel), ADC10_A (6 external + 2 internal channels), and six eUSCI interfaces (4 UART/IrDA/SPI + 2 SPI/I²C). Its metrology subsystem performs 4-quadrant power measurement per phase with digital phase correction and temperature-compensated energy computation.

It operates across 40–70 Hz line frequency using single-point calibration, supports flexible supply options with automatic switching, and retains critical data in shutdown mode (LPM4.5) at 0.18 µA. The device includes tamper-detect RTC with crystal offset calibration and password protection.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, 62 I/O pins, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6745AIPZR, the MSP430F6746AIPZR offers doubled memory for advanced firmware features without layout changes, while the MSP430F6765AIPZR adds two sigma-delta channels for expanded sensor coverage-both retain identical low-power metrology performance and regulatory compliance.

Availability

MSP430F6745AIPZR is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade energy monitoring, and AMI endpoint node deployments requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MSP430F6745AIPZR 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 precision measurement and low-power design.

The MSP430F67xxA product line targets metrology and monitoring applications, engineered specifically for high-accuracy, low-cost, and ultra-low-power energy measurement in utility-grade smart meters and grid-edge devices.

FAQ

What is the maximum number of independent current channels supported by the MSP430F6745AIPZR?

The MSP430F6745AIPZR integrates four independent 24-bit sigma-delta ADC channels (SD0–SD3), each with differential inputs, enabling simultaneous measurement of phase A, B, C, and neutral currents. This configuration satisfies 3-phase 4-wire metering requirements per ANSI C12.20 and IEC 62053 standards. The MSP430F6745AIPZR does not support more than four SD24_B channels.

Does the MSP430F6745AIPZR include hardware-based encryption capabilities?

Yes, the MSP430F6745AIPZR includes a dedicated hardware AES-128 encryption module that accelerates cryptographic operations without CPU overhead. This enables secure firmware updates, encrypted data logging, and protected communication in smart meter applications. The MSP430F6745AIPZR AES engine supports ECB and CBC modes and is accessible via DMA for throughput optimization.

What low-power modes are available on the MSP430F6745AIPZR and their typical current draw?

The MSP430F6745AIPZR offers multiple low-power modes: Standby (LPM3) draws 2.1 µA at 3 V with fast wake-up (<5 µs); RTC mode (LPM3.5) consumes 0.34 µA at 3 V for timekeeping only; and Shutdown (LPM4.5) uses 0.18 µA at 3 V. These values are measured under specified conditions per SLAS982A Rev. September 2018. The MSP430F6745AIPZR achieves these figures with integrated power management and segmented LCD operation.

Can the MSP430F6745AIPZR drive a 320-segment LCD display without external components?

Yes, the MSP430F6745AIPZR includes an integrated LCD_C controller supporting up to 320 segments with programmable contrast control and internal charge pump. It requires only external capacitors on LCDCAP and COM lines - no external bias generator or driver IC is needed. The MSP430F6745AIPZR LCD controller operates down to 3 µA in LPM3 during AC mains failure, maintaining display visibility on backup power.

What communication interfaces does the MSP430F6745AIPZR provide for smart meter connectivity?

The MSP430F6745AIPZR provides six enhanced universal serial communication interfaces (eUSCI): four eUSCI_A modules supporting UART, IrDA, and SPI; and two eUSCI_B modules supporting SPI and I²C. These enable concurrent connections to optical ports (UART), PLC modems (SPI), and secure element ICs (I²C). All eUSCI peripherals are fully configurable and DMA-capable, ensuring robust communication in noisy utility environments for the MSP430F6745AIPZR.