Texas Instruments MSP430F67691IPEU

Overview

MSP430F67691IPEU from Texas Instruments is a polyphase metering SoC designed for 3-phase electronic watt-hour meters, featuring a 25-MHz ultra-low-power CPU, six 24-bit sigma-delta ADCs (SD24_B), 512KB flash, 32KB RAM, and LCD controller supporting up to 320 segments. It delivers <0.1% energy measurement accuracy over 2000:1 dynamic range and meets ANSI C12.20 and IEC 62053 standards.

For engineers reviewing the MSP430F67691IPEU datasheet, MSP430F67691IPEU pinout, MSP430F67691IPEU application, or MSP430F67691IPEU equivalent, key selection considerations include its 128-pin LQFP (PEU) package with 90 GPIOs, dedicated pulse output pins for active/reactive energy calibration, four-quadrant power measurement per phase, and integrated RTC with crystal offset calibration and tamper detection-critical for revenue-grade utility metering designs.

Technical Context

The MSP430F67691IPEU implements a multi-ADC architecture with six independent 24-bit sigma-delta converters optimized for simultaneous voltage/current sampling across three phases plus neutral, each with differential inputs and programmable gain. Its SD24_B module supports digital phase correction for current transformers and temperature-compensated energy calculations.

It integrates TI's energy measurement software library for real-time computation of kWh, kVARh, RMS, and harmonic content, executing on the 32-bit hardware multiplier-enhanced CPU. Power management includes five low-power modes (LPM3/LPM3.5/LPM4.5), with standby current as low as 2.1 µA at 3 V and wake-up in under 5 µs-enabling long-duration backup operation during AC mains failure.

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 SoC applications.

Compared with MSP430F67681IPEU, the MSP430F67691IPEU provides double the RAM for deeper waveform capture and secure firmware partitioning; versus MSP430F67791IPEU, it trades one SD24_B channel for cost-sensitive deployments where six ADCs fully cover 3-phase + neutral + reference sensing.

Availability

MSP430F67691IPEU is available at Aetrix Electronics and suitable for smart grid revenue metering, industrial energy monitoring systems, and AMI gateway nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing for UL/IEC-certified designs.

Supply support for MSP430F67691IPEU 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 connectivity technologies, with decades of leadership in ultra-low-power microcontrollers and precision metrology solutions.

The MSP430F676x1 product line was engineered specifically for revenue-grade polyphase electricity meters, integrating metrology-grade ADCs, secure real-time processing, and low-power display drivers to minimize system BOM and meet global utility certification requirements.

FAQ

What is the maximum number of ADC channels supported by the MSP430F67691IPEU?

The MSP430F67691IPEU integrates six independent 24-bit sigma-delta ADCs (SD24_B), each with differential inputs and programmable gain. These are mapped to dedicated pins SD0P0/SD0N0 through SD5P0/SD5N0, enabling simultaneous sampling of three-phase voltage/current and neutral signals without multiplexing delays or accuracy loss.

Does the MSP430F67691IPEU support hardware-based energy pulse generation?

Yes, the MSP430F67691IPEU includes dedicated hardware pulse output pins (e.g., P1.6/COM2 and P1.7/COM3 configured as PULSE_A and PULSE_R) that generate calibrated active and reactive energy pulses synchronized to internal metrology calculations-meeting IEC 62053-31 requirements without CPU intervention.

What low-power modes are available on the MSP430F67691IPEU and their typical current draw?

The MSP430F67691IPEU offers five low-power modes: LPM3 draws 2.1 µA at 3 V (with RTC active); LPM3.5 draws 0.34 µA (RTC-only mode); and LPM4.5 draws 0.18 µA (full shutdown). All support sub-5-µs wake-up, enabling battery-backed operation exceeding 10 years in smart meter applications.

How does the MSP430F67691IPEU handle crystal oscillator calibration for the RTC?

The MSP430F67691IPEU features a password-protected RTC with on-chip crystal offset calibration and temperature compensation. It uses RTCCAP0/RTCCAP1 pins with internal capacitor arrays to auto-tune 32.768-kHz crystal frequency, eliminating external trim caps and maintaining ±2 ppm accuracy across –40°C to +85°C.

Is the MSP430F67691IPEU pin-compatible with other devices in the F676x1 family?

Yes, all MSP430F676x1 variants in the 128-pin LQFP (PEU) package-including MSP430F67691IPEU, MSP430F67681IPEU, and MSP430F67671IPEU-are pin-compatible. Differences are limited to internal resources (RAM size, SD24_B count), allowing firmware reuse and PCB design scalability across performance tiers.