Texas Instruments MSP430F6746IPZR

Overview

MSP430F6746IPZR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring four 24-bit sigma-delta ADCs, 256KB 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 MSP430F6746IPZR datasheet, MSP430F6746IPZR pinout, MSP430F6746IPZR application, or MSP430F6746IPZR equivalent, this device is selected for revenue-grade energy metering where ultra-low-power operation (0.18 µA in LPM4.5), multi-sensor interface (CT/Rogowski/shunt), and secure firmware execution are critical design requirements.

Technical Context

The MSP430F6746IPZR implements a dedicated metering signal chain with four independent SD24_B sigma-delta modulators feeding into a hardware-based energy calculation engine, enabling simultaneous phase A/B/C + neutral power measurement. Its 25-MHz CPU with 32-bit multiplier executes TI's certified energy measurement library without external co-processing.

It features dual-domain power architecture: AVCC/AVSS for analog precision (±0.1% gain error, 99 dB SNR), DVCC/DVSS for digital logic, and AUXVCCx rails for backup subsystems including RTC and tamper detection. The device supports automatic supply switching between main and backup sources during AC failure.

Key Specifications

Pinout & Package

100-pin LQFP (PZ) package, 14 mm × 14 mm body size, industrial temperature range (–40°C to +85°C), with 62 general-purpose I/O pins and dedicated metering analog inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6746IPZR, the F6748IPZR offers double flash capacity for complex communication stacks, while the F6766IPZR adds two extra sigma-delta channels for auxiliary energy monitoring-both retain identical low-power performance and metrology accuracy.

Availability

MSP430F6746IPZR is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade submetering, and AMI endpoint node designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for utility-certified production.

Supply support for MSP430F6746IPZR 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 specializing in analog and embedded processing technologies, with leadership in low-power microcontrollers and precision metrology solutions.

The MSP430F67xx product line is engineered specifically for revenue-grade energy metering, integrating metrology ADCs, secure processing, and ultra-low-power operation to replace discrete metering ICs and MCUs in single-chip solutions.

FAQ

What is the maximum number of analog input channels supported by the MSP430F6746IPZR?

The MSP430F6746IPZR integrates four independent 24-bit sigma-delta ADC modules (SD24_B), each accepting a differential analog input pair. This supports up to four simultaneous measurement channels - typically configured for three-phase voltage/current plus neutral - with dedicated hardware for gain, offset, and phase correction. No external ADCs are required for Class 0.2 metering.

Does the MSP430F6746IPZR support ANSI C12.20 and IEC 62053 standards out of the box?

Yes, the MSP430F6746IPZR meets or exceeds ANSI C12.20 Class 0.1 and IEC 62053-22 Class 0.2 accuracy requirements across 40–70 Hz line frequencies using a single calibration point. TI's certified Energy Measurement Library (EML) implements all required calculations - including four-quadrant energy, harmonics, and demand - validated against standard test benches.

What package and pin count does the MSP430F6746IPZR use?

The MSP430F6746IPZR uses a 100-pin LQFP (PZ) package measuring 14 mm × 14 mm, with 62 general-purpose I/O pins. It shares pin compatibility with other MSP430F674x and MSP430F676x devices in the same PZ package, enabling scalable design reuse across metering tiers.

How does the MSP430F6746IPZR achieve ultra-low-power operation during mains failure?

The MSP430F6746IPZR enters LPM4.5 mode drawing only 0.18 µA at 3 V, retaining RTC time, tamper logs, and critical registers using AUXVCC3. Its integrated RTC with crystal offset calibration and temperature compensation maintains ±1 ppm accuracy over –40°C to +85°C, enabling >10-year battery-backed operation without external supervision.

Is hardware-based AES-128 encryption available on the MSP430F6746IPZR?

Yes, the MSP430F6746IPZR includes a dedicated hardware AES-128 cryptographic accelerator that operates independently of the CPU. It supports ECB/CBC modes for secure firmware authentication, DLMS/COSEM message encryption, and key wrapping - with constant-time execution to prevent side-channel attacks during secure boot or OTA updates.