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PDF ATT7028A Data sheet ( Hoja de datos )
| Número de pieza | ATT7028A | |
| Descripción | Active Multi-Rate Energy Metering IC | |
| Fabricantes | Actions | |
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High accuracy, three-phase, active
multi-rate energy metering IC ATT7028A
ATT7028A User Manual
Date: 2005-03-28
Rev: 1.04
http://www.Actions.com.cn
Page 1 of 42
Rev 1.04
Free Datasheet http://www.datasheet4u.com/
1 page  
High accuracy, three-phase, active
multi-rate energy metering IC ATT7028A
§1.2 Functional description
ATT7028A is a high accuracy 3-phase electronic energy metering chip which is
suitable for 3-phase 3-wire and 3-phase 4-wire.
ATT7028A incorporates 6 second-order sigma-delta ADCs, reference voltage circuitry
and the entire signal processing required calculating power, energy, RMS data, power
factor and frequency.
ATT7028A is suitable for measuring active power and active energy for each phase
and 3 phases combined; it is also suitable for measuring voltage RMS, current RMS,
power factor, phase difference, and frequency. ATT7028A is qualified for 3-phase
multi-rate multifunctional electronic energy meter.
ATT7028A supports two kinds of calibration methods: resistance network calibration
and software calibration. Resistance network calibration applies to system which uses
resistance network to sample in voltage channel, the system error can be calibrated to
suffice class 1S via adjusting resistance network. Software calibration compensates gain
and phase via correlative registers, which can calibrate the system error to suffice class
0.5S. The pulse for active power (CF1) can be used directly to calibrate error. Refer to
chapter 3 for detailed calibration method.
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 ATT7028A’s performance.
§1.3 Block diagram
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Page 5 of 42
Rev 1.04
Free Datasheet http://www.datasheet4u.com/
5 Page 
High accuracy, three-phase, active
multi-rate energy metering IC ATT7028A
§2.3 ADC
There are 6 ADCs in ATT7028A, 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 ATT7028A:
Typical input circuitry:
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Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 42 Páginas | |
| PDF Descargar | [ Datasheet ATT7028A.PDF ] | |
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