Texas Instruments MSP430F6745AIPEU

Overview

MSP430F6745AIPEU 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, 128KB flash, 16KB RAM, and an integrated LCD controller supporting up to 320 segments.

For engineers reviewing the MSP430F6745AIPEU datasheet, MSP430F6745AIPEU pinout, MSP430F6745AIPEU application, or MSP430F6745AIPEU equivalent, key selection criteria include metrology-grade ADC channel count, RTC tamper detection, AES-128 encryption support, ultra-low-power LPM3.5 mode (0.34 µA), and 128-pin LQFP package compatibility with utility meter PCB layouts.

Technical Context

This device implements a dedicated metrology subsystem with four SD24_B sigma-delta modulators for phase current/voltage sensing, digital phase correction for CTs, and 4-quadrant energy calculation per phase. Its CPU executes TI's Energy Measurement Software Library to compute active/reactive power, RMS, harmonics, and tariff-based kWh/kvarh values in real time.

The architecture integrates dual-domain power management: AVCC/AVSS for analog precision circuitry (including reference buffers and ADCs), DVCC/DVSS for digital logic, and auxiliary supplies (AUXVCC1–3) for isolated sensor interfaces. RTC operates independently in LPM3.5 with crystal offset calibration and temperature compensation.

Key Specifications

Pinout & Package

128-pin LQFP (PEU) package with 20 mm × 14 mm body size, 0.5 mm pitch, and exposed thermal pad. Designed for reflow assembly and conformal coating in utility-grade enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6745AIPEU, the F6746AIPEU offers double flash/RAM for advanced firmware features while retaining identical metrology performance, whereas the F6745AIPZ reduces package size and I/O count at the expense of ADC channel flexibility and LCD segment capacity.

Availability

MSP430F6745AIPEU is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade submetering, and energy monitoring gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified designs.

Supply support for MSP430F6745AIPEU 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 delivering analog and embedded processing solutions for industrial, automotive, and consumer applications.

MSP430F6745AIPEU belongs to the Metrology and Monitoring MCU portfolio, engineered specifically for high-accuracy energy measurement in utility-grade meters with integrated analog front-end, security, and low-power operation.

FAQ

What metrology standards does the MSP430F6745AIPEU support out of the box?

The MSP430F6745AIPEU meets or exceeds ANSI C12.20 and IEC 62053-21/62053-22 standards when used with TI's Energy Measurement Software Library and calibrated per TI application notes. Its 24-bit SD24_B ADCs, digital phase correction, and temperature compensation ensure compliance across –40°C to +85°C without external calibration hardware. The MSP430F6745AIPEU achieves <0.1% error over 2000:1 dynamic range in both active and reactive energy measurement.

Does the MSP430F6745AIPEU include hardware for secure firmware updates?

Yes, the MSP430F6745AIPEU integrates a dedicated hardware AES-128 encryption engine that accelerates cryptographic operations required for authenticated and encrypted firmware updates. This allows secure OTA or optical-port updates without exposing private keys in software or burdening the CPU. The MSP430F6745AIPEU also supports secure boot verification using stored signatures in protected memory regions.

How many independent ADC channels does the MSP430F6745AIPEU provide for polyphase sensing?

The MSP430F6745AIPEU provides four independent 24-bit sigma-delta ADC channels via its SD24_B module - sufficient to simultaneously sample three phase voltages/currents plus neutral current in a 3-phase 4-wire system. Each channel supports differential inputs, programmable gain, and built-in digital filters. The MSP430F6745AIPEU does not support more than four SD24_B channels, unlike higher-tier F677xA variants.

What is the lowest power consumption mode available on the MSP430F6745AIPEU with RTC active?

The MSP430F6745AIPEU achieves 0.34 µA in RTC mode (LPM3.5) at 3 V, retaining real-time clock operation, 32KB RAM contents, and tamper-detection circuitry while disabling CPU, flash, and most peripherals. Wake-up from LPM3.5 occurs in less than 5 µs, enabling rapid response to pulse events or communication interrupts. This ultra-low power state is critical for maintaining timekeeping during AC mains failure in the MSP430F6745AIPEU.

Can the MSP430F6745AIPEU drive a large LCD display without external components?

Yes, the MSP430F6745AIPEU integrates a full-featured LCD controller supporting up to 320 segments (e.g., 8 commons × 40 segments) with programmable bias, frame frequency, and contrast control. It drives common-electrode LCDs directly using internal charge pumps and requires only external capacitors (LCDCAP, R33). No external LCD driver IC is needed, reducing BOM cost and board space in the MSP430F6745AIPEU-based meter design.