Overview
The Texas Instruments MSP430F67791IPZR is a highly integrated System-on-Chip (SoC) designed for polyphase metering applications. This device is part of the MSP430F677x1 family, which offers high accuracy and low system cost with minimal external components. The MSP430F67791IPZR features a low-power MSP430 CPU with a 32-bit multiplier, making it suitable for energy calculations, tariff rate management, and communication with Advanced Metering Infrastructure (AMI) and Automatic Meter Reading (AMR) modules. The device supports industry standards such as ANSI C12.20 and IEC 62053, ensuring compliance with global metering requirements.
Key Specifications
| Parameter | Specification |
|---|---|
| Package | LQFP (PZ) with 100 pins |
| Operating Temperature Range | -40°C to 85°C |
| Flash Memory | Up to 512KB |
| RAM | Up to 32KB |
| ADCs | Up to seven independent 24-bit Sigma-Delta ADCs |
| System ADC | 10-bit 200-ksps ADC |
| Communication Interfaces | Configurable among four UART, six SPI, and two I²C interfaces |
| Timers | Four 16-bit timers with nine total capture/compare registers |
| Power Consumption | 2.9 mW at 10-MHz operation (3 V), multiple low-power modes |
| Supply Voltage Range | 3.6 V down to 1.8 V |
| RTC | Password-protected real-time clock with crystal offset calibration and temperature compensation |
Key Features
- Accuracy < 0.1% over 2000:1 dynamic range for phase current
- Meets or exceeds 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
- Exact phase angle measurements and digital phase correction for current transformers
- 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
- Integrated security modules to support anti-tamper
- Multiple communication interfaces for smart meter implementations
- High-performance 25-MHz CPU with 32-bit multiplier
- Ultra-low power consumption during energy measurement
- Multiple low-power modes including standby, RTC, and shutdown modes
Applications
The MSP430F67791IPZR is primarily designed for polyphase metering applications, including:
- Revenue meters
- Smart meters
- Advanced Metering Infrastructure (AMI) and Automatic Meter Reading (AMR) systems
- Three-phase electronic watt-hour meters
- Energy measurement and tariff rate management systems
Q & A
- What is the primary application of the MSP430F67791IPZR?
The primary application is for polyphase metering, including revenue meters, smart meters, and AMI/AMR systems.
- What are the key features of the MSP430F67791IPZR's ADCs?
The device features up to seven independent 24-bit Sigma-Delta ADCs with differential inputs and variable gain.
- What standards does the MSP430F67791IPZR comply with?
The device meets or exceeds ANSI C12.20 and IEC 62053 standards.
- What is the operating temperature range of the MSP430F67791IPZR?
The operating temperature range is -40°C to 85°C.
- What are the power consumption characteristics of the MSP430F67791IPZR?
The device consumes 2.9 mW at 10-MHz operation (3 V) and has multiple low-power modes.
- What communication interfaces are available on the MSP430F67791IPZR?
The device supports configurable interfaces among four UART, six SPI, and two I²C.
- Does the MSP430F67791IPZR have integrated security features?
Yes, it includes integrated security modules to support anti-tamper functions.
- What is the display capability of the MSP430F67791IPZR during AC mains failure?
The display operates at very low power, consuming 3 µA in LPM3 during AC mains failure.
- What is the CPU performance of the MSP430F67791IPZR?
The device features a high-performance 25-MHz CPU with a 32-bit multiplier.
- Is the MSP430F67791IPZR suitable for use in harsh environments?
Yes, it has an industrial temperature range of -40°C to 85°C.
