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Cirrus公司的CS5480是高精度三相電能測量模擬前端,每路集成了單獨的4階Delta-Sigma模數轉換器(ADC),基準電路和已驗證的EXL信號處理核,提供有功,無功和表觀能量測量.4000:1動態范圍的能量測量精度為0.1%,1000:1動態范圍的電流RMS測量精度為0.1%,電源電壓3.3V.本文介紹了CS5480主要特性,方框圖, 單相三線和兩線連接框圖, 并聯傳感器, 電流變壓器和Rogowski線圈電表連接圖, 以及CDB5480U評估板主要特性,框圖,電路圖,材料清單和PCB布局圖. The CS5480 incorporates independent, 4th order, Delta-Sigma analog-to-digital converters for every channel, reference circuitry, and the proven EXL signal processing core to provide active, reactive, and apparent energy measurement. In addition, RMS and power factor calculations are available. Calculations are output via configurable energy pulse, or direct UART/SPI™ serial access to on-chip registers. Instantaneous current, voltage, and power measurements are also available over the serial port. Multiple serial options are offered to allow customer flexibility. The SPI provides higher speed, and the 2-wire UART minimizes the cost of isolation where required. Three configurable digital outputs provide energy pulses, zerocrossing, energy direction, and interrupt functions. Interrupts can be generated for a variety of conditions including voltage sag or swell, overcurrent, and more. On-chip register integrity is assured via checksum and write protection. The CS5480 is designed to interface to a variety of voltage and current sensors including shunt resistors, current transformers, and Rogowski coils. On-chip functionality makes digital calibration simple and ultra- fast, minimizing the time required at the end of the customer production line. Performance across temperature is ensured with an on-chip voltage reference with very low drift. A single 3.3V power supply is required, and power consumption is very low at <13mW. To minimize space requirements, the CS5480 is offered in a low-cost, 4mm x 4mm 24-pin QFN package. CS5480主要特性: Des cription • Superior Analog Performance with Ultra-low Noise Level & High SNR • Energy Measurement Accuracy of 0.1% over 4000:1 Dynamic Range • Current RMS Measurement Accuracy of 0.1% over 1000:1 Dynamic Range • 3 Independent 24-bit, 4th-order, Delta-Sigma Modulators for Voltage and Current Measurements • 3 Configurable Digital Outputs for Energy Pulses, Zero-crossing, or Energy Direction • Supports Shunt Resistor, CT, & Rogowski Coil Current Sensors • On-chip Measurements & Calculations: - Active, Reactive, and Apparent Power - RMS Voltage and Current - Power Factor and Line Frequency - Instantaneous Voltage, Current, and Power • Overcurrent, Voltage Sag, and Voltage Swell Detection • Ultra-fast On-chip Digital Calibration • Internal Register Protection via Checksum and Write Protection • UART/SPI™ Serial Interface • On-chip Temperature Sensor • On-chip Voltage Reference (25ppm /℃ Typ.) • Single 3.3V Power Supply • Ultra-fine Phase Compensation • Low Power Consumption: <13mW • Power Supply Configurations GNDA = GNDD = 0V, VDDA = +3.3V • 4mm x 4mm, 24-pin QFN Package 
圖1. CS5480方框圖
圖2. CS5480單相三線連接框圖
圖3. CS5480單相兩線連接框圖 CDB5480U評估板 The CDB5480U is an extensive tool designed to evaluate the functionality and performance of the Cirrus Logic CS5480 power/energy measurement device. Multiple analog input connection options, configuration input filters, direct and isolated digital interfaces, multiple power supply options, an onboard programmable micro-controller, and visual LEDs with an LCD panel make the board a flexible and powerful customer development tool for various power/energy measurement applications. The GUI software provides easy and complete access to the onboard CS5480 device. In addition, it includes the function of raw ADC data collection with time domain, frequency domain, and histogram analysis. CDB5480U評估板主要特性: • Standalone Power Meter Application • Voltage and Current Interfaces • Low- and High-voltage Sensor Connections • Adaptable Sensor Filters Onboard • USB Communication with PC • UART/SPI Optically Isolated Communication • Onboard C8051F342 Microcontroller • Single Supply Operation USB or 5V • Onboard DC-DC Converter and Regulator • LCD Power Monitor Display • LabWindows®/CVI® GUI Software – Full Register Setup & Chip Control – Simplified Register Access – Quick Calibration Control FFT Analysis – Time Domain Analysis – Noise Histogram Analysis • Voltage Reference Access CDB5484/80/90 Evaluation Boards
圖4. CDB5484/80/90評估板外形圖 The CDB5484/80/90U boards are designed to evaluate the functionality and performance of the CS5484/80/90 energy measurement IC family. Shunt resistors, current transformers or Rogowski coils can be connected to the analog inputs. Intuitive GUI software provides easy and full access to the on-board CS5484/80/90 device and MCU. On-board LEDs and LCD displays enable stand alone operation for extended testing. These CDBs enable fast and easy preliminary evaluation of Cirrus Logic’s AFE products
圖5. CDB5484/80/90評估板方框圖
圖6. CS5480并聯傳感器電表連接圖
圖7. CS5480電流變壓器電表連接圖
圖8. CS5480 Rogowski線圈電表連接圖
圖9. CS5480評估板電路圖:模擬輸入
圖10. CS5480評估板電路圖:CS5480和插座
圖11. CS5480評估板電路圖:MCU和USB接口 CS5480評估板材料清單(BOM):
圖12. CS5480評估板元件布局圖:頂層
圖13. CS5480評估板PCB布局圖:頂層
圖14. CS5480評估板PCB布局圖:底層 詳情請見: http://www.cirrus.com/en/pubs/proDatasheet/CS5480_F1_v2.pdf 和 http://www.cirrus.com/en/pubs/rdDatasheet/CDB5480U_DB3.pdf |
