Texas Instruments MSP430F67621AIPZR

Overview

MSP430F67621AIPZR from Texas Instruments is a polyphase metering SoC designed for revenue-grade three-phase electricity meters. It integrates three 24-bit sigma-delta ADCs, a 25-MHz CPU with 32-bit multiplier, 64KB flash/4KB RAM, RTC with AUXVCC3 power domain, and LCD controller supporting up to 320 segments - enabling <0.5% accuracy over 2000:1 dynamic range per phase under ANSI C12.20 and IEC 63053 compliance.

For engineers reviewing the MSP430F67621AIPZR datasheet, MSP430F67621AIPZR pinout, MSP430F67621AIPZR application, or MSP430F67621AIPZR equivalent, key selection considerations include its 100-pin LQFP (PZ) package, ultra-low-power LPM3.5 mode (1.24 µA), four UART/SPI/I²C configurable eUSCI ports, and dedicated analog front-end for current transformer, Rogowski coil, or shunt-based sensing in utility metering systems.

Technical Context

The MSP430F67621AIPZR implements a dedicated metering architecture with three independent SD24_B sigma-delta modulators feeding digital filters and energy calculation engines. Its analog subsystem supports exact phase-angle measurement, digital phase correction, and 40–70 Hz line frequency operation using single-point calibration - eliminating need for multi-frequency recalibration in field-deployed meters.

Digital execution leverages the MSP430 CPU core with hardware 32-bit multiplier for real-time tariff management, pulse generation, and communication stack handling. Power management includes dual-supply domains (AVCC/DVCC), auxiliary rails (AUXVCC1–3), and automatic supply switching between main and backup sources - ensuring continuous RTC and data retention during AC mains failure.

Key Specifications

Pinout & Package

100-pin LQFP (PZ) package, 14 mm × 14 mm body size, 0.5 mm pitch, exposed thermal pad not present. Pin functions include three SD24_B analog input pairs (SD0P0/SD0N0 through SD2P0/SD2N0), dedicated AUXVCC3 for RTC bias, LCDCAP for LCD charge pump, and 72 general-purpose I/Os with mixed analog/digital capability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67641AIPZR and ADE9153AACPZ-RL, the MSP430F67621AIPZR provides optimal balance of metrology accuracy, embedded processing, and system integration - delivering full meter functionality in a single chip while maintaining upgrade path to higher-flash variants.

Availability

MSP430F67621AIPZR is available at Aetrix Electronics and suitable for smart electricity metering, revenue-grade energy monitoring, and AMI endpoint node designs requiring stable component supply, long-term lifecycle support, and traceable sourcing for utility-certified production.

Supply support for MSP430F67621AIPZR 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 for industrial, automotive, and energy infrastructure markets.

The MSP430F676x1A product line was engineered specifically for revenue metering applications - integrating metrology-grade ADCs, low-power real-time processing, and utility-compliant security features into a single SoC to reduce system cost and certification effort.

FAQ

What is the maximum dynamic range accuracy guaranteed for MSP430F67621AIPZR in three-phase metering?

The MSP430F67621AIPZR guarantees better than 0.5% accuracy over a 2000:1 dynamic range for phase current measurements, as verified per ANSI C12.20 and IEC 63053 standards. This performance is achieved using its three 24-bit sigma-delta ADCs with digital phase correction and single-point 40–70 Hz line frequency calibration - eliminating need for multi-point calibration across operating conditions.

Does MSP430F67621AIPZR support direct connection to current transformers without external amplification?

Yes, the MSP430F67621AIPZR supports direct CT interfacing via its SD24_B modulator inputs (pins SD0P0/SD0N0 through SD2P0/SD2N0), which accept ±100 mV differential signals with programmable gain. Internal PGA stages and digital filtering allow direct connection to standard 1:2000 CT secondaries - no external op-amps or level-shifting circuitry required for typical meter designs.

How does the RTC in MSP430F67621AIPZR maintain time during AC mains failure?

The MSP430F67621AIPZR RTC operates from the dedicated AUXVCC3 power rail, which can be supplied by a supercapacitor or coin-cell battery. In LPM3.5 mode, RTC consumes only 1.24 µA at 3 V - enabling >10 years of continuous timekeeping on a standard CR2032 cell. Crystal offset and temperature calibration are performed autonomously during normal operation to ensure ±2 ppm accuracy over temperature.

Can MSP430F67621AIPZR drive a 320-segment LCD without external bias circuitry?

Yes, the MSP430F67621AIPZR integrates a programmable LCD controller capable of driving up to 320 segments in static, 2-, 3-, or 4-mux configurations. The internal charge pump (enabled via LCDCAP pin) generates required bias voltages - only an external 1–10 µF capacitor is needed. Contrast is digitally adjustable across 32 levels, eliminating need for external potentiometers or resistor networks.

What communication interfaces are available on MSP430F67621AIPZR for smart meter connectivity?

The MSP430F67621AIPZR provides four eUSCI modules configurable as three UARTs, three SPIs, and one I²C interface - supporting concurrent connections to optical probe (UART), PLC modem (SPI), and HAN radio (UART or SPI). All interfaces operate down to LPM3 with autonomous wakeup, enabling always-on communication readiness while maintaining ultra-low system power.