Texas Instruments MSP430F6745IPEUR

Overview

MSP430F6745IPEUR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four 24-bit sigma-delta ADCs, 128KB flash, 16KB RAM, and <0.1% energy measurement accuracy over 2000:1 dynamic range. It integrates LCD controller (320-segment), AES-128 encryption, RTC with temperature compensation, and supports ANSI C12.20/IEC 62053 compliance.

For engineers reviewing the MSP430F6745IPEUR datasheet, MSP430F6745IPEUR pinout, MSP430F6745IPEUR application, or MSP430F6745IPEUR equivalent, key selection criteria include its 128-pin LQFP package, 4-channel SD24_B ADC configuration, ultra-low-power LPM3.5 mode (0.34 µA), and dedicated pulse output pins for active/reactive energy calibration in utility metering designs.

Technical Context

The MSP430F6745IPEUR implements a 25-MHz CPU with 32-bit hardware multiplier for real-time energy calculations and tariff management. Its analog front-end includes four independent 24-bit sigma-delta modulators with differential inputs and programmable gain, supporting current transformers, Rogowski coils, or shunt sensors across three phases plus neutral.

Digital subsystems include six eUSCI modules configurable as UART/SPI/I²C, four 16-bit timers with nine capture/compare registers, and an integrated LCD_C controller with contrast control. Power architecture enables automatic switching between main and backup supplies, sustaining operation at 3 µA in LPM3 during AC mains failure.

Key Specifications

Pinout & Package

The MSP430F6745IPEUR is housed in a 128-pin LQFP (PEU) package with 90 general-purpose I/O pins, dual analog supply domains (AVCC/AVSS), auxiliary voltage rails (AUXVCC1–3), and dedicated SD24_B analog input pairs (SD0P0/SD0N0 through SD3P0/SD3N0).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6745IPEUR, MSP430F6746IPEUR offers double flash/RAM for feature-rich firmware, while MSP430F6748IPEUR prioritizes code density over data buffers-both retain identical metrology performance, pinout, and low-power behavior for drop-in compatibility in existing layouts.

Availability

MSP430F6745IPEUR is available at Aetrix Electronics and suitable for utility metering, industrial energy monitoring, and smart grid infrastructure requiring stable component supply, long-term lifecycle support, and TI-qualified metrology-grade silicon.

Supply support for MSP430F6745IPEUR 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, energy efficiency, and system-level integration.

The MSP430F67xx family was engineered specifically for revenue-grade polyphase metering, combining ultra-low-power MCU architecture with high-accuracy analog front-ends and metrology-specific peripherals to minimize external components and certification effort.

FAQ

What is the maximum number of independent analog input channels supported by the MSP430F6745IPEUR?

The MSP430F6745IPEUR integrates four independent 24-bit sigma-delta ADC channels (SD24_B), each with differential inputs and programmable gain. These channels support simultaneous sampling of phase A, B, C, and neutral currents or voltages-enabling full 3-phase 4-wire metering without multiplexing or external ADCs. The MSP430F6745IPEUR also includes a separate 10-bit system ADC with six external channels for auxiliary sensing.

Does the MSP430F6745IPEUR support ANSI C12.20 and IEC 62053 standards out of the box?

Yes, the MSP430F6745IPEUR is designed to meet or exceed ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.5S accuracy requirements across 2000:1 dynamic range. This compliance is achieved through on-chip calibration routines, digital phase correction, temperature-compensated energy calculation, and factory-trimmed reference circuits-all enabled by the TI Energy Measurement Software Library shipped with the MSP430F6745IPEUR.

What low-power modes are available on the MSP430F6745IPEUR, and what is the lowest active current draw?

The MSP430F6745IPEUR supports multiple low-power modes including LPM3 (2.1 µA), LPM3.5 (0.34 µA), and LPM4.5 (0.18 µA) at 3 V. In active mode at 10 MHz and 3 V, it draws 2.9 mW-equivalent to ~967 µA. The ultra-low LPM3.5 mode retains RTC and 16 KB RAM while disabling CPU and most peripherals, making it ideal for battery-backed operation during mains failure.

Can the MSP430F6745IPEUR drive a 320-segment LCD directly, and does it support contrast control?

Yes, the MSP430F6745IPEUR includes an integrated LCD_C controller supporting up to 320 segments (8 commons × 40 segments) with software-programmable bias, frame frequency, and internal charge pump. Contrast is adjustable via register-controlled voltage division and internal capacitor charging, eliminating need for external potentiometers or DACs. The LCDCAP pin must be connected to DVSS if unused.

Is hardware AES-128 encryption available on the MSP430F6745IPEUR, and how is it implemented?

Yes, the MSP430F6745IPEUR includes a dedicated hardware AES-128 encryption module that operates independently of the CPU. It supports ECB, CBC, and CTR modes with zero wait-state throughput, enabling secure firmware updates, encrypted meter data transmission, and tamper-proof key storage. The AES engine is accessible via standard peripheral registers and requires no external crypto ICs-reducing BOM cost and attack surface in the MSP430F6745IPEUR design.