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1. Description
MSP430F6779AIPZ polyphase metering SoCs are powerful highly integrated solutions that offer high accuracy and low system cost with few external components. The MSP430F6779AIPZ microcontroller (MCU) family is part of the MSP430™ Metrology and Monitoring MCU portfolio targeting energy measurement and power monitoring applications including smart grid and building automation. MSP430F6779AIPZ MCUs feature up to seven independent 24-bit sigma- delta ADCs that can provide better than 0.1% accuracy. MSP430F6779AIPZ devices integrate a high-performance MSP430 CPU with a 32-bit multiplier to perform all metrology calculations. 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 consumption of the MSP430F6779AIPZ enables the system power supply to be minimized to reduce overall cost. Low standby power requires minimal energy storage, and critical data can be retained longer in case of a mains power failure. The MSP430F6779AIPZ MCU family is supported by an extensive software and hardware ecosystem. The Texas Instruments Energy Measurement Design Center (EMDC) can simplify development and accelerate designs by quickly configuring the Energy Measurement software library, automatically generating code, performing calibration, and viewing results. MSP430F6779AIPZ MCUs execute the Energy Measurement software library, which calculates all relevant energy and power results. Development kits include the EVM430-F6779 three-phase electricity meter evaluation module and the MSP-TS430PEU128 128-pin target development board. Industry standard development tools and hardware platforms are available to speed development of meters that meet all of the ANSI and IEC standards globally.
2. Features
1. Accuracy < 0.1% Over 2000:1 Dynamic Range for Phase Current
2. Meets or Exceeds ANSI C12.20 and IEC 62053 Standards
3. Support for Multiple Sensors Such as Current Transformers, Rogowski Coils, or Shunts
4. Power Measurement for up to Three Phases Plus Neutral
5. Dedicated Pulse Output Pins for Active and Reactive Energy for Calibration
6. 4-Quadrant Measurement per Phase or Cumulative
7. Exact Phase-Angle Measurements
8. Digital Phase Correction for Current Transformers
9. Temperature-Compensated Energy Measurements
10. 40-Hz to 70-Hz Line Frequency Range Using Single Calibration
11. Flexible Power Supply Options With Automatic Switching
12. Display Operates at Very Low Power During AC Mains Failure: 3 µA in LPM3
13. LCD Driver With Contrast Control for up to 320 Segments
14. Password-Protected Real-Time Clock (RTC) With Tamper Detection, Crystal Offset Calibration, and Temperature Compensation
15. Integrated Security Modules to Support Anti‑Tamper and Encryption
16. Multiple Communication Interfaces for Smart Meter Implementations
17. High-Performance Analog
– Up to Seven Independent 24-Bit Sigma-Delta ADCs With Differential Inputs and Variable Gain
– 10-Bit 200-ksps SAR ADC With Six External Channels and Two Internal Channels, Including Supply and Temperature Sensor Measurement
18. Highly Integrated Digital
– Three-Channel Direct Memory Access (DMA) Controller
– Integrated Hardware AES-128 Module for Encryption
– 16-Bit Cyclic Redundancy Check (CRC) Module
– Four 16-Bit Timers With Nine Total Capture/Compare Registers
19. Six Enhanced Universal Serial Communication Interfaces (eUSCIs)
– eUSCI_A0, eUSCI_A1, eUSCI_A2, and eUSCI_A3 Support UART, IrDA, and SPI
– eUSCI_B0, eUSCI_B1 Support SPI and I2C
20. Ultra-Low Power Consumption
– 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
21. CPU
– High-Performance 25-MHz CPU With 32-Bit Multiplier
– Wide Input Supply Voltage Range: 3.6 V Down to 1.8 V
22. Memory
– Up to 512KB of Single-Cycle Flash
– Up to 32KB of RAM With Single-Cycle Access
23. Package Options
– 128-Pin LQFP (PEU) Package With 90 I/O Pins
– 100-Pin LQFP (PZ) Package With 62 I/O Pins
24. Development Tools (Also See Tools and Software)
– Energy Measurement Design Center for MSP430 MCUs with 24-Bit Sigma-Delta ADCs (MSP-EM-DESIGN-CENTER)
– Three-Phase Electronic Watt-Hour EVM for Metering (EVM430-F6779)
– Target Development Board (MSP‑TS430PEU128)
3. Applications
1. 3-Phase Electronic Watt-Hour Meters
2. Utility Metering
3. Energy Monitoring
4. Operating Modes
1. Active mode (AM)
– All clocks are active
2. Low-power mode 0 (LPM0)
– CPU is disabled
– ACLK and SMCLK remain active, MCLK is disabled
– FLL loop control remains active
3. Low-power mode 1 (LPM1)
– CPU is disabled
– FLL loop control is disabled
– ACLK and SMCLK remain active, MCLK is disabled
4. Low-power mode 2 (LPM2)
– CPU is disabled
– MCLK and FLL loop control and DCOCLK are disabled
– DC generator of the DCO remains enabled
– ACLK remains active
5. Low-power mode 3 (LPM3)
– CPU is disabled
– MCLK, FLL loop control, and DCOCLK are disabled
– DC generator of the DCO is disabled
– ACLK remains active
6. Low-power mode 4 (LPM4)
– CPU is disabled
– ACLK is disabled
– MCLK, FLL loop control, and DCOCLK are disabled
– DC generator of the DCO is disabled
– Crystal oscillator is stopped
– Complete data retention
7. Low-power mode 3.5 (LPM3.5)
– Internal regulator disabled
– No RAM retention, backup RAM retained
– I/O pad state retention
– RTC clocked by low-frequency oscillator
– Wake-up input from RST/NMI, RTC_C events, port P1, or port P2
8. Low-power mode 4.5 (LPM4.5)
– Internal regulator disabled
– No RAM retention, backup RAM retained
– RTC is disabled
– I/O pad state retention
– Wake-up input from RST/NMI, port P1, or port P2
5. CPU
The MSP430F6779AIPZ CPU has a 16-bit RISC architecture that is highly transparent to the application. All operations, other than program-flow instructions, are performed as register operations in conjunction with seven addressing modes for source operand and four addressing modes for destination operand. The CPU is integrated with 16 registers that provide reduced instruction execution time. The register-toregister operation execution time is one cycle of the CPU clock. Four of the registers, R0 to R3, are dedicated as program counter, stack pointer, status register, and constant generator, respectively. The remaining registers are general-purpose registers. Peripherals are connected to the CPU using data, address, and control buses. Peripherals can be managed with all instructions.
