Texas Instruments MSP430F67621AIPN

Overview

MSP430F67621AIPN 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, 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- and IEC 63053-compliant utility metering systems.

For engineers reviewing the MSP430F67621AIPN datasheet, MSP430F67621AIPN pinout, MSP430F67621AIPN application, or MSP430F67621AIPN equivalent, key selection considerations include its 80-pin LQFP (PN) package, ultra-low-power LPM3.5 mode (1.24 µA), dedicated AUXVCC3-powered RTC with temperature compensation, and support for current transformers, Rogowski coils, or shunt sensors in 3-phase 4-wire star configurations.

Technical Context

The MSP430F67621AIPN implements a dedicated energy measurement architecture centered on three independent SD24_B sigma-delta modulators with differential inputs and programmable gain, each feeding into a shared digital filter engine. Its real-time clock operates from a separate AUXVCC3 supply with integrated crystal offset and temperature calibration, ensuring timekeeping integrity during AC mains failure.

Power management includes automatic switching between main and backup supplies, with LCD operation at 3 µA in LPM3 and shutdown mode consuming only 0.78 µA. Communication is handled via three configurable eUSCI_A (UART/SPI) and one eUSCI_B (SPI/I²C) modules, while timing relies on four 16-bit timers with nine capture/compare registers.

Key Specifications

Pinout & Package

The MSP430F67621AIPN is housed in an 80-pin LQFP (PN) package with exposed thermal pad, measuring 12 mm × 12 mm. Pin functions include dedicated analog inputs for SD24_B modulators (SD0P0/SD0N0 through SD2P0/SD2N0), auxiliary voltage supplies (AUXVCC1–AUXVCC3), LCD segment/com drivers (COM0–COM7, S0–S39), and multiplexed digital peripherals (eUSCI, timers, RTCCLK).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67641AIPN and ADE9153A, the MSP430F67621AIPN delivers optimal balance of integrated processing, metrology accuracy, and cost for mid-tier three-phase meters - offering sufficient flash/RAM for ANSI/IEC compliance while avoiding over-provisioned resources that increase BOM cost and qualification scope.

Availability

MSP430F67621AIPN is available at Aetrix Electronics and suitable for smart grid revenue metering, industrial energy monitoring, and AMI module integration requiring stable component supply and long-term lifecycle assurance.

Supply support for MSP430F67621AIPN 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 MSP430F676x1A product line was engineered specifically for revenue-grade polyphase electricity meters, integrating metrology-grade ADCs, ultra-low-power operation, and certified energy algorithms to reduce system cost and accelerate compliance with ANSI C12.20 and IEC 63053 standards.

FAQ

What is the maximum dynamic range accuracy guaranteed for MSP430F67621AIPN in three-phase current measurement?

The MSP430F67621AIPN guarantees <0.5% accuracy over a 2000:1 dynamic range for phase current measurement, validated per ANSI C12.20 Class 0.5 and IEC 63053 requirements. This performance is achieved using its three 24-bit sigma-delta ADCs with digital phase correction and on-chip energy calculation firmware - no external calibration components required.

Does MSP430F67621AIPN support direct connection to current transformers without external signal conditioning?

Yes, the MSP430F67621AIPN supports direct CT interfacing via its SD24_B modulator inputs (SD0P0/SD0N0, etc.), which accept differential signals with programmable gain and built-in digital phase correction. External burden resistors are required, but no op-amp front-end or level-shifting circuitry is needed - simplifying BOM and layout for CT-based meter designs.

How does the RTC in MSP430F67621AIPN maintain accuracy during AC mains failure?

The MSP430F67621AIPN RTC operates from a dedicated AUXVCC3 supply with integrated crystal offset calibration and temperature compensation. In LPM3.5 mode, it consumes only 1.24 µA at 3 V and retains timekeeping accuracy to ±2 ppm over –40°C to 85°C - enabling reliable timestamping of energy events during extended power outages without external RTC ICs.

What communication interfaces are available on MSP430F67621AIPN for AMI connectivity?

The MSP430F67621AIPN provides three eUSCI_A modules (configurable as UART or SPI) and one eUSCI_B module (configurable as SPI or I²C). This allows simultaneous connections to PLC modems (UART), RF transceivers (SPI), and sensor hubs (I²C), supporting multi-protocol AMI implementations without external bus switches or protocol converters.

Is MSP430F67621AIPN pin-compatible with other devices in the MSP430F676x1A family?

Yes, the MSP430F67621AIPN shares identical pinout and signal mapping with the MSP430F67641AIPN in the 80-pin PN package. Both devices use the same LQFP-80 footprint, power domains, and peripheral assignments - enabling hardware reuse across meter tiers by changing only flash/RAM configuration during firmware programming.