Texas Instruments MSP430F67621IPZR

Overview

MSP430F67621IPZR from Texas Instruments is a polyphase metering SoC designed for revenue-grade 3-phase electricity meters. It integrates three 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 64KB flash, 4KB RAM, and an LCD controller supporting up to 320 segments - enabling <0.5% accuracy over 2000:1 dynamic range for phase current measurement in ANSI C12.20/IEC 63053-compliant smart meters.

For engineers reviewing the MSP430F67621IPZR datasheet, MSP430F67621IPZR pinout, MSP430F67621IPZR application, or MSP430F67621IPZR equivalent, this device delivers verified metrology performance, ultra-low-power RTC operation (1.24 µA in LPM3.5), flexible communication (3 UART / 3 SPI / 1 I²C), and real-time four-quadrant energy calculation across three phases - critical for utility-grade meter design and certification.

Technical Context

The MSP430F67621IPZR implements a dedicated metrology subsystem with three independent SD24_B sigma-delta modulators feeding digital filters, each configurable for current transformer, Rogowski coil, or shunt sensor inputs. Its analog front-end supports exact phase angle measurement and digital phase correction, with line frequency tracking from 40 Hz to 70 Hz using single-point calibration.

Power management includes dual-domain supply control (AVCC/DVCC/AUXVCCx), automatic switching between main and backup supplies, and hardware-accelerated low-power modes: LPM3 (2.5 µA), LPM3.5 (1.24 µA), and LPM4.5 (0.78 µA) - all preserving RTC and backup RAM functionality during AC mains failure.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, industrial temperature range (–40°C to +85°C). Pinout validated per TI SLAS998A Rev. October 2018, Figure 4-1 and Table 4-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67641IPZR, the MSP430F67621IPZR offers optimized cost and power for Class 0.5 meters with fixed feature sets, while ADuCM3029BBCZ trades metrology integration for broader MCU flexibility - making MSP430F67621IPZR the preferred choice where certified 3-phase accuracy, LCD integration, and sub-µA RTC are mandatory.

Availability

MSP430F67621IPZR is available at Aetrix Electronics and suitable for smart electricity metering, industrial energy monitoring gateways, and grid-quality analyzers requiring stable component supply, long-term lifecycle assurance, and TI-qualified metrology performance.

Supply support for MSP430F67621IPZR 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 high-reliability silicon solutions for industrial, automotive, and energy infrastructure markets.

The MSP430F676x1 product line was engineered specifically for revenue-grade polyphase metering - integrating metrology-grade ADCs, low-power RTC, and certified energy algorithms into a single SoC to reduce system cost and accelerate ANSI/IEC certification.

FAQ

What metrology standards does the MSP430F67621IPZR meet?

The MSP430F67621IPZR meets or exceeds ANSI C12.20 and IEC 63053 Class 0.5 accuracy requirements for active energy measurement. Its 24-bit sigma-delta ADC architecture, digital phase correction, and 2000:1 dynamic range validation are documented in TI's SLAS998A datasheet and supported by TI's certified energy measurement software library - enabling direct compliance evidence for utility certification bodies without external calibration hardware.

Does the MSP430F67621IPZR support three-phase four-wire metering?

Yes, the MSP430F67621IPZR natively supports three-phase four-wire (star-connected) metering via its three independent SD24_B sigma-delta ADC channels (SD0P0/SD0N0, SD1P0/SD1N0, SD2P0/SD2N0) and dedicated voltage channel inputs. The device's functional block diagram and application diagram (Figure 1-1 in SLAS998A) explicitly show 3-phase 4-wire star topology implementation with neutral current monitoring capability.

What is the role of AUXVCC3 in the MSP430F67621IPZR?

AUXVCC3 is a dedicated auxiliary power supply input for the MSP430F67621IPZR's real-time clock (RTC) subsystem. It enables the RTC to operate independently during main power failure, maintaining calendar time, crystal offset calibration, and tamper-event timestamps. In LPM3.5 mode, the RTC draws only 1.24 µA from AUXVCC3 - allowing coin-cell or supercapacitor backup to sustain >10 years of operation without mains power.

Can the MSP430F67621IPZR drive a 320-segment LCD directly?

Yes, the MSP430F67621IPZR integrates a programmable LCD controller capable of driving up to 320 segments in multiplexed configurations (e.g., 4×32 or 8×40). It includes internal charge pumps for V1–V5 bias generation, contrast control registers, and dedicated COM/SEG pins (COM0–COM7, S0–S39). No external LCD driver IC or voltage boosters are required - reducing bill-of-materials cost and PCB area in space-constrained meter designs.

How many communication interfaces does the MSP430F67621IPZR support?

The MSP430F67621IPZR supports four configurable eUSCI modules: three eUSCI_A peripherals (each可 configured as UART or SPI) and one eUSCI_B peripheral (configurable as SPI or I²C). This provides up to three UARTs, three SPIs, and one I²C interface simultaneously - enabling concurrent communication with PLC modems, RF transceivers, optical ports, and host MCUs in advanced AMI meter architectures.