The Texas Instruments MSP430F677x family of polyphase metering SoCs are powerful highly integrated solutions for revenue meters that offer accuracy and low system cost with few external components. The F677x family of devices uses the low-power MSP430 CPU with a 32-bit multiplier to perform all energy calculations, metering applications such as tariff rate management, and communications with AMR and AMI modules.
The F677x devices feature TI"s 24-bit sigma-delta converter technology, which provides better than 0.1% accuracy. Family members include up to 512KB of flash, 32KB of RAM, and an LCD controller with support for up to 320 segments.
The ultra-low-power nature of the F677x devices means that the system power supply can be minimized to reduce overall cost. Lowest standby power means that backup energy storage can be minimized and critical data retained longer in case of a mains power failure.
The F677x family of devices executes the TI energy measurement software library, which calculates all relevant energy and power results. The energy measurement software library is available with the F677x devices at no cost. Industry standard development tools and hardware platforms are available to speed development of meters that meet all of the ANSI and IEC standards globally.
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
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
Password-Protected Real-Time Clock With Crystal Offset Calibration and Temperature Compensation
Integrated Security Modules to Support Anti-Tamper and Encryption
Multiple Communication Interfaces for Smart Meter Implementations
High-Performance 25-MHz CPU With 32-Bit Multiplier
Wide Input Supply Voltage Range: 3.6 V Down to 1.8 V
Ultra-Low-Power Consumption During Energy Measurement
2.9 mW at 10-MHz Operation (3 V)
Multiple Low-Power Modes
Standby Mode (LPM3): 2.1 µA at 3 V, Wake Up in Less Than 5 µs
RTC Mode (LPM3.5): 0.34 µA at 3 V
Shutdown Mode (LPM4.5): 0.18 µA at 3 V
Up to 512KB of Single-Cycle Flash
Up to 32KB of RAM With Single-Cycle Access
Up to Seven Independent 24-Bit Sigma-Delta ADCs With Differential Inputs and Variable Gain
System 10-Bit 200-ksps ADC
Six Channels Plus Supply and Temperature Sensor Measurement
Integrated Hardware AES-128 Module for Encryption
Six Enhanced Communications Ports
Configurable Among Four UART, Six SPI, and Two I²C Interfaces
Four 16-Bit Timers With Nine Total Capture/Compare Registers
128-Pin LQFP (PEU) Package With 90 I/O Pins
100-Pin LQFP (PZ) Package With 62 I/O Pins
Industrial Temperature Range of –40°C to 85°C
3-Phase Electronic Watt-Hour Meter Development Tools
