Overview
The MSP430F67791AIPEU is a highly integrated System-on-Chip (SoC) designed by Texas Instruments for polyphase metering applications. It is part of the MSP430™ Metrology and Monitoring MCU portfolio, targeting energy measurement and power monitoring in smart grid and building automation systems. This microcontroller offers high accuracy, low system cost, and minimal external components, making it an ideal solution for three-phase electronic watt-hour meters and utility metering.
Key Specifications
| Specification | Details |
|---|---|
| Part Number | MSP430F67791AIPEU |
| Package | 128-Pin LQFP (PEU) |
| Body Size | 20 mm x 14 mm |
| Flash Memory | Up to 512 KB |
| RAM | Up to 32 KB |
| ADCs | Up to seven independent 24-bit sigma-delta ADCs, 10-bit 200-ksps SAR ADC |
| Timers | Four 16-bit timers with nine total capture/compare registers |
| Communication Interfaces | Six enhanced universal serial communication interfaces (eUSCIs): UART, IrDA, SPI, I²C |
| CPU | High-performance 25-MHz CPU with 32-bit multiplier |
| Supply Voltage Range | 3.6 V down to 1.8 V |
| Low-Power Modes | Standby Mode (LPM3): 2.1 µA at 3 V, RTC Mode (LPM3.5): 0.34 µA at 3 V, Shutdown Mode (LPM4.5): 0.18 µA at 3 V |
| Operating Temperature Range | –40°C to 85°C |
Key Features
- Accuracy < 0.1% over 2000:1 dynamic range for phase current, meeting or exceeding ANSI C12.20 and IEC 62053 standards.
- Support for multiple sensors such as current transformers, Rogowski coils, or shunts.
- Power measurement for up to three phases plus neutral.
- Dedicated pulse output pins for active and reactive energy for calibration.
- Four-quadrant measurement per phase or cumulative, with exact phase-angle measurements.
- Digital phase correction for current transformers and temperature-compensated energy measurements.
- 40-Hz to 70-Hz line frequency range using single calibration.
- Flexible power supply options with automatic switching.
- Display operates at very low power during AC mains failure: 3 µA in LPM3.
- LCD driver with contrast control for up to 320 segments.
- Password-protected real-time clock (RTC) with tamper detection, crystal offset calibration, and temperature compensation.
- Integrated security modules to support anti-tamper and encryption.
- Multiple communication interfaces for smart meter implementations.
- Ultra-low power consumption with multiple low-power modes.
Applications
- Three-phase electronic watt-hour meters.
- Utility metering.
- Energy monitoring.
- Smart grid and building automation systems.
Q & A
- What is the primary application of the MSP430F67791AIPEU?
The primary application is for three-phase electronic watt-hour meters and utility metering.
- What is the accuracy of the MSP430F67791AIPEU for phase current measurement?
The accuracy is less than 0.1% over a 2000:1 dynamic range.
- What types of sensors does the MSP430F67791AIPEU support?
It supports current transformers, Rogowski coils, or shunts.
- What are the low-power modes available in the MSP430F67791AIPEU?
Standby Mode (LPM3), RTC Mode (LPM3.5), and Shutdown Mode (LPM4.5).
- What is the operating temperature range of the MSP430F67791AIPEU?
The operating temperature range is –40°C to 85°C.
- What communication interfaces are available on the MSP430F67791AIPEU?
Six enhanced universal serial communication interfaces (eUSCIs) supporting UART, IrDA, SPI, and I²C.
- What is the maximum flash memory available on the MSP430F67791AIPEU?
Up to 512 KB of single-cycle flash.
- Does the MSP430F67791AIPEU have integrated security features?
- What development tools are available for the MSP430F67791AIPEU?
Development kits include the EVM430-F6779 three-phase electricity meter evaluation module and the MSP-TS430PEU128 128-pin target development board.
- How does the MSP430F67791AIPEU handle power measurement?
