Maxim 公司的78M6631是三相電源功率測量和監(jiān)測系統(tǒng)級芯片(SoC),集成了10MHz 8051兼容的MPU核,22位Delta-Sigma轉(zhuǎn)換器和32位計算引擎(CE),支持三角型和Y型三相連接.2000:1電流范圍內(nèi)和整個溫度內(nèi)瓦特精度小于0.5%,超過IEC 62053/ANSI C12.20標準,基準電壓溫漂小于40 ppm/℃,具有高速SPI通信,主要用在建筑物自動化,數(shù)據(jù)中心,通信,存儲電源和電源分配單元,馬達運行和風細雨太陽能逆變器.本文介紹了78M6631主要特性, 78M6631評估板主要特性以及在三相四線和三相三線連接的應用框圖,評估板電路圖和材料清單,PCB布局圖.
78M6631:3-Phase Power Measurement and Monitoring SoC
The 78M6631 is a highly integrated, 3-phase power measurement and monitoring SoC with a 10MHz, 8051-compatible MPU core and Teridian’s Single Converter Technology® containing a 22-bit delta-sigma converter and 32-bit compute engine (CE). The 78M6631 has been designed specifically for a wide variety of applications requiring 3-phase power and quality measurements. It supports both Delta and Wye configurations.
At the measurement interface, the device provides six analog inputs including three differential current and three voltage for interfacing to current and voltage sensors. The integrated MPU core and 128KB of flash memory provide a flexible means of configuration, post-processing, data formatting, interfacing to host processor through a UART or SPI™ interface, or using DIO pins for LEDs or relay control. All firmware is preloaded during manufacturing test.
78M6631主要特性:
< 0.5% Watt Accuracy Over 2000:1 Current Range and Over Temperature
Exceeds IEC 62053/ANSI C12.20 Standards
Voltage Reference < 40 ppm/℃
Six Analog Inputs Supporting 3-Phase Voltage and Current Measurement Inputs
Pin- or Bi-Selectable Delta or Wye Configuration
22-Bit Delta-Sigma ADC with Independent 32-Bit Compute Engine (CE)
8-Bit MPU (80515), One Clock Cycle per Instruction with 4KB MPU XRAM
128KB Flash with Security
32kHz Time Base with Hardware Watchdog Timer
UART, I²C, and High-Speed Slave SPI Host Interface Options
17 General-Purpose 5V Tolerant I/O Pins
Packaged in a RoHS-Compliant (6/6) Lead-Free 56-Pin TQFN
Application Firmware Includes (per Phase):
True RMS Current and Voltage Calculations
Active, Reactive, Apparent, Fundamental, and Harmonic Power Calculations
Fundamental and Harmonic Current and Voltage Calculations
Line Frequency and Power Factor Calculations
Phase Compensation (±18° at 60Hz)
Built-In Calibration Routines
Programmable Alarm Thresholds
Command Line (UART) Communications
High-Speed SPI Communications
78M6631應用:
Building Automation
Data Center, Telecom, Storage Power Supplies, and Power Distribution Units
Motor Health
Solar Inverters
78M6631評估板
The Teridian™ 78M6631 Evaluation Board is an electrical measurement unit for performing measurements on a 3-phase AC system. It incorporates the 78M6631 power and energy measurement device and connects to a PC through a USB cable such as the one provided in the demo kit. The Evaluation Board demonstrates the capability of the 78M6631 energy meter controller chip for measurement accuracy and overall system use.
The on-board 78M6631 is pre-programmed with the Firmware Demo Code.
The 78M6631 energy measurement data and status is read back over the serial UART interface using a text-based CLI command set (easy manual operation is performed using HyperTerminal) and through the serial peripheral interface (SPI).
圖1.78M6631評估板外形圖
The 78M6631 Evaluation Board Demo Kit includes:
• 78M6631 Evaluation Board
• USB Cable Assembly USB A-B 28/24 1.8M (Tyco/Amp 1487588-3)
• In-Circuit Emulator (ICE) Adaptor
• Three CTs
• CD with documentation
圖2.78M6631評估板應用框圖(三相四線連接)
圖3.78M6631評估板應用框圖(三相三線連接)
圖4.78M6631評估板電路圖(1)
圖5.78M6631評估板電路圖(2)
圖6.78M6631評估板電路圖(3)
78M6631評估板材料清單:
圖7.78M6631評估板PCB布局圖:左為頂層,右為底層
詳情請見:
http://pdfserv.maxim-ic.com/en/an/AN5263
