PDF ATT7022B Data sheet ( Hoja de datos )

Número de pieza	ATT7022B
Descripción	3-phase energy metering IC User Manual
Fabricantes	Actions
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No Preview Available ! www.datasheet4u.com Multifunctional fundamental wave and harmonic three-phase energy metering IC ATT7022B ATT7022B User Manual Date: 2005-06-30 Rev: 1.04 http://www.Actions.com.cn Page 1 of 54 Rev 1.04 1 page Multifunctional fundamental wave and harmonic three-phase energy metering IC ATT7022B §1.2 Functional description ATT7022B is a high accuracy 3-phase electronic energy metering chip which is suitable for 3-phase 3-wire and 3-phase 4-wire services. ATT7022B incorporates 7 second-order sigma-delta ADCs, reference circuitry and all www.datasheet4u.com the signal processing required calculating power, energy, RMS data, power factor and frequency. ATT7022B is suitable for measuring active power, reactive power, apparent power, active energy, and reactive energy for each phase and 3 phases combined; it is also suitable for measuring voltage RMS, current RMS, power factor, phase difference, and frequency. ATT7022B is qualified for 3-phase multifunctional electronic energy meter. ATT7022B supports software calibration for gain, phase. Two pulses for active and reactive power (CF1, CF2) can be used directly to calibrate error. Refer to chapter 3 for detailed calibration method. ATT7022B supports fundamental wave active power and reactive power measurement. The two pulses output (CF3, CF4) can be used to calibrate fundamental wave power error. ATT7022B provides two kinds of apparent energy output: RMS apparent energy and PQS apparent energy, CF3 and CF4 could also be used as apparent energy pulse output. SPI port is used to transfer data to and from host MCU for all measuring result and calibration data. Refer to chapter 4 for detailed SPI reading and writing method. Power supply monitor circuitry safeguards ATT7022B’s performance. §1.3 Block diagram http://www.Actions.com.cn Page 5 of 54 Rev 1.04 5 Page Multifunctional fundamental wave and harmonic three-phase energy metering IC ATT7022B §2.3 ADC There are 7 ADCs in ATT7022B, all of which use fully differential voltage inputs, with a maximum input voltage of ±1.0V. For proper application, we suggest that voltage channel input set at 0.5V and current channel input (at base current –Ib) set at 0.1V. The typical value of reference voltage (Refcap and Refout) is 2.4V. Block diagram of ADC in ATT7022B: V1P PGA1 V1N V2P PGA2 SIGMA-DELTA MODULATOR DECIMATION FILTER FIR FILTER V2N V3P PGA3 SIGMA-DELTA MODULATOR DECIMATION FILTER FIR FILTER V3N V4P PGA4 SIGMA-DELTA MODULATOR DECIMATION FILTER FIR FILTER V4N V5P PGA5 SIGMA-DELTA MODULATOR DECIMATION FILTER FIR FILTER Register output V5N V6P PGA6 SIGMA-DELTA MODULATOR DECIMATION FILTER FIR FILTER V6N V7P PGA7 SIGMA-DELTA MODULATOR DECIMATION FILTER FIR FILTER ADC V7N SIGMA-DELTA MODULATOR DECIMATION FILTER FIR FILTER Temperature sensor Reference voltage Diagram 2-3-1 ADC internal circuitry block diagram Typical input circuitry: 1.5(6)A/5mA 1.2K 10K Current input 20Ω 10nF 10K 220V/0.5V 1.2K 10nF 10K 1.2K Voltage input 10nF 10K 1.2K 10nF REFOUT V1P V1N V2P V2N Diagram: 2-3-2 typical input circuitry http://www.Actions.com.cn Page 11 of 54 Rev 1.04 11 Page

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