Texas Instruments MSP430F6745AIPZ

Overview

MSP430F6745AIPZ 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 (up to 320 segments), and hardware AES-128 encryption. It operates across 40–70 Hz line frequency with single calibration and supports current transformers, Rogowski coils, or shunt sensors.

For engineers reviewing the MSP430F6745AIPZ datasheet, MSP430F6745AIPZ pinout, MSP430F6745AIPZ application, or MSP430F6745AIPZ equivalent, key selection criteria include metrology-grade ADC channel count, RTC tamper detection, ultra-low-power LPM3.5 mode (0.34 µA), and 100-pin LQFP package compatibility with ANSI C12.20/IEC 62053 compliance requirements.

Technical Context

The MSP430F6745AIPZ integrates a 25-MHz 16-bit CPU with 32-bit hardware multiplier for real-time energy calculations, paired with 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 uses dedicated pulse output pins for active/reactive energy calibration and digital phase correction for CT-based current sensing.

Power management includes automatic supply switching between AC mains and backup battery, RTC with crystal offset calibration and temperature compensation, and multiple low-power modes-LPM3 (2.1 µA), LPM3.5 (0.34 µA), and LPM4.5 (0.18 µA)-enabling extended operation during mains failure while retaining critical data in RAM.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, 0.5 mm pitch, 62 I/O pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6745AIPZ, MSP430F6746AIPZ offers double flash/RAM for advanced firmware features, while MSP430F6765AIPZ adds two extra SD24_B channels-both retain identical pinout, power profile, and metrology accuracy, enabling scalable design reuse.

Availability

MSP430F6745AIPZ is available at Aetrix Electronics and suitable for smart electricity meters, revenue-grade energy monitors, and AMI endpoint nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F6745AIPZ 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 decades of utility infrastructure experience.

The MSP430F67xxA family targets metrology and power monitoring applications, integrating high-accuracy ADCs, secure peripherals, and ultra-low-power operation specifically for ANSI/IEC-compliant smart meters and grid-edge sensors.

FAQ

What metrology standards does the MSP430F6745AIPZ meet?

The MSP430F6745AIPZ meets or exceeds ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S accuracy requirements for active and reactive energy measurement. Its 24-bit sigma-delta ADCs achieve <0.1% error over 2000:1 dynamic range, validated across 40–70 Hz line frequencies using single-point calibration-enabling compliance without external calibration hardware. The MSP430F6745AIPZ also supports 4-quadrant measurement and exact phase-angle calculation required by modern utility standards.

Does the MSP430F6745AIPZ support tamper detection and secure firmware updates?

Yes, the MSP430F6745AIPZ includes password-protected RTC with dedicated tamper-detect pins that log physical intrusion events with precise timestamps, meeting ANSI C12.20 anti-tampering mandates. It also integrates a hardware AES-128 encryption module for on-the-fly encryption of meter data and authenticated firmware updates-eliminating software-based crypto overhead and ensuring secure communication over HAN/PLC links without external security ICs.

What is the lowest power mode supported by the MSP430F6745AIPZ during AC mains failure?

The MSP430F6745AIPZ supports LPM3.5 (RTC mode) with 0.34 µA current draw at 3 V, retaining full 16 KB RAM content and running the real-time clock continuously. This enables >10-year battery life in backup operation while preserving critical meter state, time-stamped events, and tamper logs-critical for revenue-grade applications where mains interruption must not compromise data integrity or timekeeping accuracy.

How many independent analog input channels does the MSP430F6745AIPZ provide for current/voltage sensing?

The MSP430F6745AIPZ provides four independent 24-bit sigma-delta ADC channels (SD24_B) with differential inputs, configured as SD0–SD3. Each channel supports programmable gain and direct connection to current transformers, Rogowski coils, or shunt resistors-enabling simultaneous measurement of phase A, B, C, and neutral currents without external signal conditioning. An additional 10-bit SAR ADC (ADC10_A) provides six external channels for auxiliary sensing (e.g., supply voltage, temperature).

Is the MSP430F6745AIPZ pin-compatible with other devices in the MSP430F67xxA family?

Yes, the MSP430F6745AIPZ in the 100-pin LQFP (PZ) package shares identical pinout, power domains, and peripheral mapping with all other PZ-package variants in the MSP430F67xxA family-including MSP430F6746AIPZ, MSP430F6765AIPZ, and MSP430F6775AIPZ. This enables hardware design reuse across performance tiers (flash/RAM/ADC count) without PCB changes, simplifying platform scaling for meter manufacturers targeting different certification levels or feature sets.