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Resumen del manual
Two chipset versions are available to support differing ranges of operating temperature: The ADSST-EM-3040 chipset is rated at 0°C to 70°C for commercial applications, while the ADSST-EM- 3041 chipset operates at –25°C to +85°C for industrial use. Adobe Systems .CDSPBUTTONSCTSMPSLCD DISPLAYRTCFLASHSPI BUSRS-232OPTOCTCTADCADSST-EM-3040RESISTORBLOCKBOOTFLASH03738-0-001 Figure 1. Block Diagram of a Functional Meter The ADC and DSP are interfaced to simultaneously acquire voltage and current samples on all three phases and to perform mathematically intensive computations to calculate various instantaneous parameters and perform harmonic analysis. The chipset can be interfaced to any general-purpose microproces- sor to develop state of the art tri-vector or polyphase energy metering solutions with a wide range of basic currents from 1 A to 30 A. By incorporating a comprehensive data set of parame- ters, including instantaneous measurements, accumulated parameters, and harmonic analysis data, the ADSST-SALEM-3T chipset meets high end energy metering requirements. The abil- ity to easily configure the chipset for various parameters makes it a very flexible solution. The phase and nonlinearity compensation for current transformers is done in software (patent pending) without having to use any passive components in the circuit for compensation, thus minimizing variations in accuracy with temperature and time. The ADSST-SALEM-3T measures and computes a large num- ber of parameters essential for high end metering. Table 1. Parameter Each Phase Total RMS Voltage .. RMS Current .. Active Power .. .. Apparent Power .. .. Inductive Reactive Power .. .. Capacitive Reactive Power .. .. Power Factor .. .. Frequency .. Positive Active Energy .. .. Negative Active Energy .. .. Apparent Energy .. .. Positive Inductive Reactive Energy .. .. Negative Inductive Reactive Energy .. .. Positive Capacitive Reactive Energy .. .. Negative Capacitive Reactive Energy .. .. Voltage Magnitude and Phase for All Odd Harmonics up to 21st Order .. .. Current Magnitude and Phase for All Odd Harmonics up to 21st Order .. .. The ADSST-SALEM-3T offers some excellent features that make the final meter cost-effective and easy to manufacture. TABLE OF CONTENTS Easy Calibration............................................................................3 Effective Phase Compensation...................................................3 Ease of Design...............................................................................3 Quadrant and Other Conventions.............................................3 General Description of the ADSST-218x DSP.........................4 Architecture Overview................................................................4 ADSST-218x Common-Mode Pins...........................................6 Clock Signals.................................................................................7 RESET............................................................................................7 Recommended Operating Conditions......................................7 ADSST-218x Electrical Characteristics.........................................8 Absolute Maximum Ratings—ADSST-218x.................................9 ESD Caution..................................................................................9 Pin Configuration—ADSST-218x................................................10 General Description of the ADSST-73360LAR ADC................11 Specifications—ADSST-73360LAR.............................................12 Absolute Maximum Ratings—ADSST-73360LAR....................14 ESD Caution................................................................................14 Pin Configuration and Pin Function Descriptions— ADSST-73360LAR..........................................................................15 Pin Function Descriptions........................................................15 Grounding and Layout..............................................................16 Power-Up Initialization and Data from the ADSST-SALEM-3T....................................................................17 Voltage and Current Sensing....................................................17 Accuracy of Reference Design Using the ADSST-SALEM-3T Chipset.....................................................18 Outline Dimensions.......................................................................20 Ordering Guide...............................................................................21 REVISION HISTORY 7/04—Revision 0: Initial Version EASY CALIBRATION The ADSST-SALEM-3T chipset has highly advanced calibration routines embedded into the software. Ease of calibration is the key feature in this chipset. By sending specific commands to the ADSST-SALEM-3T chipset, the dc offsets and gains for all volt- age and current channels can be calibrated automatically. Active and reactive power calibration is also available for fine-tuning the errors....
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