Texas Instruments MSP430F67691IPEUR

Overview

MSP430F67691IPEUR from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring six 24-bit sigma-delta ADCs, 512KB flash, 32KB RAM, and <0.1% energy measurement accuracy over 2000:1 dynamic range at phase current. It supports ANSI C12.20 and IEC 62053 compliance, operates from 1.8 V to 3.6 V, and delivers ultra-low-power operation down to 0.18 µA in LPM4.5 shutdown mode.

For engineers reviewing the MSP430F67691IPEUR datasheet, MSP430F67691IPEUR pinout, MSP430F67691IPEUR application, or MSP430F67691IPEUR equivalent, key selection considerations include its six-channel SD24_B ADC configuration (vs. seven in F677x1), 128-pin LQFP package with 90 GPIOs, RTC with crystal offset calibration, LCD driver for 320 segments, and integrated security modules for anti-tamper in utility metering systems.

Technical Context

The MSP430F67691IPEUR implements a dedicated metering subsystem using six independent 24-bit sigma-delta modulators with differential inputs and programmable gain, enabling simultaneous high-accuracy voltage and current sampling across three phases plus neutral. Its 25-MHz CPU with 32-bit hardware multiplier executes TI's energy measurement software library for real-time kWh, kVARh, and power quality calculations without external co-processing.

It integrates dual power domains (AVCC/DVCC), auxiliary supplies (AUXVCC1–3) for backup subsystem operation during AC mains failure, and a tamper-detect-capable RTC with temperature-compensated crystal oscillator. Communication is handled via six configurable eUSCI ports supporting UART, SPI, and I²C - four eUSCI_A and two eUSCI_B modules - with full pin remapping capability on Ports P2–P4.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (PEU), 20 mm × 14 mm body size, industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F67791IPEU, the MSP430F67691IPEUR offers identical metrology accuracy and package compatibility but omits one SD24_B channel - making it optimal for 3-phase+neutral designs that do not require redundant neutral current measurement. Against MSP430F67681IPEU, it provides double the RAM for robust cryptographic stack and extended data logging buffers without sacrificing ADC count or power efficiency.

Availability

MSP430F67691IPEUR is available at Aetrix Electronics and suitable for smart metering, industrial energy monitoring, and grid-edge distributed energy applications requiring stable component supply, long-term lifecycle assurance, and TI-qualified metrology performance.

Supply support for MSP430F67691IPEUR 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 IP.

The MSP430F676x1 product line is engineered specifically for revenue-grade polyphase electricity meters, integrating metrology ADCs, secure real-time clock, LCD driver, and communication peripherals into a single SoC to minimize external components and certification effort.

FAQ

What is the maximum number of independent 24-bit sigma-delta ADC channels supported by the MSP430F67691IPEUR?

The MSP430F67691IPEUR integrates six independent 24-bit sigma-delta ADC channels (SD24_B). This is confirmed in Table 3-1 of the SLAS815D datasheet, which distinguishes the F676x1 family (6 channels) from the F677x1 family (7 channels). All six channels support differential inputs, programmable gain, and synchronous sampling - sufficient for full 3-phase + neutral current and voltage measurement in Class 0.2 revenue meters.

Does the MSP430F67691IPEUR support ANSI C12.20 and IEC 62053-22 compliance out of the box?

Yes, the MSP430F67691IPEUR is designed to meet ANSI C12.20 Class 0.2 and IEC 62053-22 Class 0.2 accuracy requirements. Its <0.1% error over 2000:1 dynamic range, digital phase correction, temperature-compensated energy calculation, and 40–70 Hz line frequency support (with single calibration) are explicitly cited in the device features section of SLAS815D. Final system-level certification requires proper layout, sensor selection, and calibration - but the MSP430F67691IPEUR provides the validated metrology foundation.

What is the function of the AUXVCC3 pin on the MSP430F67691IPEUR, and what supply voltage does it require?

The AUXVCC3 pin on the MSP430F67691IPEUR supplies power to the RTC and backup RAM subsystem during main supply failure. It accepts 1.8 V to 3.6 V and enables ultra-low-power RTC operation at 0.34 µA in LPM3.5 mode. This allows timekeeping and tamper-event logging to continue for months on a small backup capacitor or coin cell - a requirement for ANSI C12.20-compliant meters. The pin must be decoupled with a 100 nF capacitor to DVSS.

How many GPIOs are available on the MSP430F67691IPEUR in the 128-pin LQFP package?

The MSP430F67691IPEUR provides 90 general-purpose I/O pins in the 128-pin LQFP (PEU) package. This includes 8 COM lines for LCD driving, multiple ADC input pins, eUSCI signal pins, and standard digital I/O. Pin count is consistent across the F676x1, F677x1, and F674x1 families in the PEU package, as verified in Table 3-1 and Figure 4-1 of SLAS815D.

Can the MSP430F67691IPEUR drive a 320-segment LCD directly, and what LCD bias configuration does it support?

Yes, the MSP430F67691IPEUR integrates an LCD_C peripheral capable of driving up to 320 segments using 8 commons (COM0–COM7) and 40 segments (S0–S39). It supports static, 2-mux, 3-mux, and 4-mux bias configurations with software-controllable contrast and internal charge pump. The LCDCAP pin must be connected to DVSS if unused, and external capacitors are required for charge-pump operation - details are specified in Section 5.46 and 5.47 of SLAS815D.