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CS5484：高精度四路能量測量模擬前端解決方案 Cirrus公司的CS5484是高精度四路能量測量模擬前端(AFE)，每路集成了4階24位Delta-Sigma模數(shù)轉(zhuǎn)換器(ADC)，基準(zhǔn)電路，并提供EXL信號處理核,以進(jìn)行有用、無用和表觀功率測量。支持并聯(lián)電阻，CT和Rogowski線圈電流傳感器，動態(tài)范圍4000:1的能量測量精度0.1%，動態(tài)范圍1000:1的電流RMS測量精度0.1%,單電源3.3V工作，功耗低于13mW。 計算輸出是通過一個可配置的能量脈沖，或通過直接UART/ SPI串行訪問片上寄存器。瞬時電流、電壓和功率的測量，也可通過串口。提供多個串行選項，以增加客戶的靈活性。 SPI提供更高的速度，和2線UART，最大限度地減少了所需隔離的成本。 四個可配置的數(shù)字輸出提供能量脈沖、過零、能源方向和中斷功能。在多種條件下可以產(chǎn)生中斷，包括電壓驟降或驟升和過流等等。通過校驗和寫保護(hù)來保證片上寄存器的整合性。CS5484可以與各種電壓和電流傳感器連接，包括分流電阻器，電流互感器，Rogowski線圈。其片上功能使得數(shù)字校準(zhǔn)簡單易行，和超級快速，減少了客戶生產(chǎn)線所需的時間。其低漂移片上基準(zhǔn)電壓確保了溫度性能。該器件需要一個單一的3.3V電源，功耗低于13mW。為了盡量減少空間需求，CS5484的封裝為低成本的5mm x 5mm28引腳QFN封裝。 CS5484主要特性 •較好的模擬性能與超低的噪聲水平和 高信噪比 •能源測量精度為0.1％（4000:1動態(tài)范圍內(nèi)） •電流RMS測量精度為0.1％（1000:1的動態(tài)范圍） • 4個獨立的24位四階Delta-Sigma調(diào)制器用于電壓和電流測量 • 4個可配置數(shù)字輸出用于能量脈沖，過零，或能源方向 •支持分流電阻，CT和Rogowski線圈電流傳感器 •片上測量/計算： –有功，無功，視在功率 – RMS電壓和電流 –功率因數(shù)和線路頻率 –瞬時電壓，電流和電源 –過電流，電壓驟降，電壓膨脹檢測 –超快速芯片的數(shù)字校準(zhǔn) –通過校驗碼的內(nèi)部寄存器保護(hù)和寫保護(hù)的UART/ SPI串行接口 –片上溫度傳感器 –片上電壓參考（25 PPM/℃典型值） • 3.3V單電源供電 •超細(xì)相位補(bǔ)償 •低功耗：<13mW •電源配置 - GNDA = GNDD = 0 V, VDDA = +3.3 V • 5mm×5mm的28引腳QFN封裝 CDB5484/80/90U 評估板 多個模擬輸入連接選項，配置輸入濾波器，直接和孤立的數(shù)字接口，多種電源選項，板上可編程微控制器，以及與視覺LED液晶顯示面板。該板是一個靈活，強(qiáng)大的客戶開發(fā)工具，可用于各種功率/電能計量應(yīng)用。GUI軟件提供簡單而完整的訪問和控制板載CS5484設(shè)備。包括原始ADC數(shù)據(jù)采集與時域功能、頻域和直方圖分析。該板被分成兩個主要部分，為模擬和數(shù)字。模擬部分包括CS5484，無源抗混疊濾波器和高電壓部分及衰減電阻網(wǎng)絡(luò)。數(shù)字部分包括，C8051F342單片機(jī)，液晶顯示器，硬件測試開關(guān)，復(fù)位電路，USB接口。該板還具有一個用戶友好的電源連接。 CDB5484U評估板主要特性 •單機(jī)功率計應(yīng)用 •電壓和電流接口 •低和高電壓的傳感器連接 •板上可調(diào)傳感器過濾器 •與PC的USB通信 • UART / SPI光隔離通信 •板上C8051F342微控制器 •單電源USB或5V供電 •板上DC / DC轉(zhuǎn)換器和穩(wěn)壓器 • LCD電源監(jiān)視器顯示 • LabWindows/CVI的GUI軟件 •全寄存器設(shè)置和芯片控制 •簡化寄存器 •快速校準(zhǔn)控制 • FFT分析 •時域分析 •噪聲直方圖分析 •參考電壓訪問 詳情請見: http://solution.eccn.com/solution_2012020811065884.htm 解決方案 
圖1 CS5484方框圖
圖2 CS5484典型連接框圖(單相三線I2S電表)
圖3 CDB5484U評估板方框圖 Cirrus公司的CS5484是高精度四路能量測量模擬前端(AFE),每路集成了4階24位Delta-Sigma模數(shù)轉(zhuǎn)換器(ADC),基準(zhǔn)電路,并提供EXL信號處理核,以進(jìn)行有用,無用和表觀功率測量.支持并聯(lián)電阻,CT和Rogowski線圈電流傳感器,動態(tài)范圍4000:1的能量測量精度0.1%,動態(tài)范圍1000:1的電流RMS測量精度0.1%,單電源3.3V工作,功耗低于13mW.本文介紹了CS5484主要特性,方框圖, 單相三線I2S電表的典型連接框圖,以及CDB5484U評估板主要特性,框圖,采用CDB5484U評估板的并聯(lián)傳感器, 電流變壓器和Rogowski線圈電流傳感器的電表框圖,評估板電路圖,材料清單以及PCB元件布局圖與走線圖. The CS5484 is a high-accuracy, four-channel, energy measurement analog front end. The CS5484 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 through a 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. Four configurable digital outputs provide energy pulses, zero-crossing, 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 CS5484 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 low drift. A single 3.3V power supply is required, and power consumption is low at <13mW. To minimize space requirements, the CS5484 is offered in a low-cost, 5mm x5mm 28-pin QFN package. CS5484主要特性: • Superior Analog Performance with Ultra-low Noise Level and 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 • 4 Independent 24-bit, 4th-order, Delta-Sigma Modulators for Voltage and Current Measurements • 4 Configurable Digital Outputs for Energy Pulses, Zero-crossing, or Energy Direction • Supports Shunt Resistor, CT, and 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 (25 ppm/℃ Typ.) • Single 3.3V Power Supply • Ultra-fine Phase Compensation • Low Power Consumption: <13 mW • Power Supply Configurations - GNDA = GNDD = 0 V, VDDA = +3.3 V • 5mmx5mm 28-pin QFN Package
圖1.CS5484方框圖
圖2.CS5484典型連接框圖(單相三線I2S電表) CDB5484/80/90U 評估板 The CDB5484U is an extensive tool designed to evaluate the functionality and performance of Cirrus Logic’s CS5484 power/ energy measurement device. Multiple analog input connection options, configuration input filters, direct and isolated digital interfaces, multiple power supply options, an onboard programmable microcontroller, 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 and control to the onboard CS5484 device. It also includes the function of raw ADC data collection with time domain, frequency domain, and histogram analysis. The board is partitioned into two main sections: analog and digital. The analog section consists of the CS5484, passive anti-aliasing filters, and a high-voltage section with attenuation resistor networks. The digital section consists of the C8051F342 microcontroller, LCD, hardware test switches, reset circuitry, and USB interface. The board also has a user-friendly power supply connection. CDB5484U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 and Chip Control – Simplified Register – Quick Calibration Control – FFT Analysis – Time Domain Analysis – Noise Histogram Analysis • Voltage Reference Access
圖3. CDB5484U評估板外形圖
圖4. CDB5484U評估板方框圖
圖5. CDB5484U并聯(lián)傳感器電表框圖
圖6. CDB5484U電流變壓器電表框圖
圖7. CDB5484U Rogowski線圈電表框圖
圖8. CDB5484U評估板電路圖:模擬輸入
圖9. CDB5484U評估板電路圖:CS5484和插座
圖10. CDB5484U評估板電路圖:MCU和USB接口 CDB5484U評估板材料清單:
圖11. CDB5484U評估板 PCB元件布局圖:頂層
圖12. CDB5484U評估板 PCB走線圖:頂層
圖13. CDB5484U評估板 PCB走線圖:底層 詳情請見: 
CS5484_F1[1].pdf
(964.05 KB)
CDB5484U_DB3[1].pdf
(4.31 MB)
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