Texas Instruments MSP430F6745IPZR

Overview

MSP430F6745IPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, integrating a 25-MHz ultra-low-power MCU, four 24-bit sigma-delta ADCs, LCD controller (320 segments), AES-128 encryption, and six eUSCI ports. It delivers <0.1% energy measurement accuracy over 2000:1 dynamic range and meets ANSI C12.20 and IEC 62053 standards.

For engineers reviewing the MSP430F6745IPZR datasheet, MSP430F6745IPZR pinout, MSP430F6745IPZR application, or MSP430F6745IPZR equivalent, this device is selected for revenue-grade energy metering where phase angle accuracy, tamper resistance, low standby power (0.34 µA in LPM3.5), and integrated metrology peripherals are critical design requirements.

Technical Context

The MSP430F6745IPZR implements a dedicated metrology subsystem with four independent SD24_B sigma-delta modulators supporting differential inputs and programmable gain, enabling simultaneous voltage/current sampling across up to three phases plus neutral. Its 32-bit hardware multiplier accelerates real-time energy calculations using TI's certified energy measurement library.

It features dual power domains (AVCC/DVCC), auxiliary supply monitoring (AUXVCC1–AUXVCC3), RTC with crystal offset calibration and temperature compensation, and hardware-based AES-128 for secure firmware and data protection - all operating within an industrial temperature range of –40°C to 85°C.

Key Specifications

Pinout & Package

The MSP430F6745IPZR is housed in a 100-pin LQFP (PZ) package measuring 14 mm × 14 mm, with 62 general-purpose I/O pins, dedicated metrology analog inputs (SDxP/N), RTC crystal connections (XIN/XOUT), LCD segment/common drivers (COM0–COM7, S0–S16), and security/tamper detection pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6746IPZR and MSP430F6765IPZR, the MSP430F6745IPZR offers optimal balance of metrology precision, security, and cost for Class 0.2 3-phase meters with standard feature sets - avoiding over-provisioned memory or unused ADC resources.

Availability

MSP430F6745IPZR is available at Aetrix Electronics and suitable for smart electricity meters, industrial energy monitors, anti-tamper utility meters, and grid-scale power analyzers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MSP430F6745IPZR 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, with leadership in low-power microcontrollers and precision metrology ICs.

The MSP430F6745IPZR belongs to TI's polyphase metering SoC product line, engineered specifically for revenue-grade energy measurement in utility-grade smart meters - emphasizing metrology accuracy, security, ultra-low-power operation, and integration of all essential metering peripherals.

FAQ

What is the maximum number of differential analog inputs supported by the MSP430F6745IPZR?

The MSP430F6745IPZR integrates four 24-bit sigma-delta ADC modules (SD24_B), each supporting one differential input pair (e.g., SD0P0/SD0N0). This allows up to four simultaneous differential voltage or current measurements - sufficient for three-phase voltage + neutral or three-phase current + reference configurations. No external signal conditioning is required for direct shunt or CT interfacing.

Does the MSP430F6745IPZR support IEC 62053-22 Class 0.2 accuracy?

Yes, the MSP430F6745IPZR achieves <0.1% energy measurement accuracy over a 2000:1 dynamic range, satisfying IEC 62053-22 Class 0.2 requirements. This is validated through TI's energy measurement software library and confirmed in the SLAS768E datasheet under metrology performance specifications.

What low-power modes are available on the MSP430F6745IPZR and their typical currents?

The MSP430F6745IPZR supports multiple low-power modes: LPM3 (standby) draws 2.1 µA at 3 V with RTC active; LPM3.5 (RTC-only mode) consumes 0.34 µA; and LPM4.5 (shutdown) uses 0.18 µA. These modes retain RAM and register state, enabling sub-5 µs wake-up - critical for maintaining timekeeping and data integrity during AC mains failure.

Can the MSP430F6745IPZR drive a 320-segment LCD directly?

Yes, the MSP430F6745IPZR includes an integrated LCD_C peripheral supporting up to 320 segments with built-in charge pump, contrast control, and blinking functionality. It drives common-electrode LCDs with up to 8 commons (COM0–COM7) and 40 segments per common, eliminating the need for external LCD controllers or bias generators.

Is hardware AES-128 encryption available on the MSP430F6745IPZR?

Yes, the MSP430F6745IPZR includes a dedicated hardware AES-128 module that performs encryption/decryption independently of the CPU. It supports ECB, CBC, and CTR modes and is used by TI's energy measurement library for secure firmware updates, tariff data protection, and encrypted HAN communication - reducing CPU overhead and improving security robustness.