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PDF ATT7021 Data sheet ( Hoja de datos )
| Número de pieza | ATT7021 | |
| Descripción | Single Phase Energy Metering IC | |
| Fabricantes | AS | |
| Logotipo |  |
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Actions Semiconductor Co., LTD.
Single Phase Energy Meter IC --ATT7021
Actions Semiconductor Co.,LTD
ATT7021
User’s Manual
Page 1of 8
Tel 86-756-3392353 Fax 86-756-3392251
1 page  
Actions Semiconductor Co., LTD.
Single Phase Energy Meter IC --ATT7021
PERFORMANCE PARAMETER
1) Frequency Outputs F1 and F2 The ATT7021’s output frequency or pulse rate is related to the
input voltage signals by the following equation
Frequency
8.06 ×V1 ×V 2 × G × F1−4
V 2 REF
2) Error as e N % of reading The ATT7021’s percentage error is defined as
Percentage Error
Energy Re gistered By ATT 7021
Ture Energy
True Energy ×100
3) Start – up Current and No load Threshold The ATT7021 also includes a Start-up Current and No
load threshold feature that will eliminate any creep effects in the meter. The ATT7021 is designed to
issue a minimum output frequency on all modes except when SCF = 0 and S1 = S0 = 1. The no-load
detection threshold is disabled on this output mode to accommodate specialized application of the
ATT7021. Any load generating a frequency lower than this minimum frequency will not cause a pulse to
be issued on F1, F2 or CF. The minimum output frequency is given as 0.0014% of the full-scale output
frequency for each of the F1–4 frequency selections. A start-up current 10 mA at 220 V and PF=1.
APPLICATION NOTES:
Table I
F1 and F2 Frequency at 100imp/kWhr
IMAX
12.5 A
25 A
40 A
60 A
80 A
120 A
F1 and F2 (Hz)
0.076
0.153
0.244
0.367
0.489
0.733
Table II
S1 , S0 SCF VS CF Frequency ( full input )
SCF,S1,S0
100
000
101
001
110
010
111
011
F1-4 F1/2 (Hz)
1.7 0.34
3.4 0.68
6.8 1.36
13.6 2.72
CF(Hz)
128×F1,F2
64×F1,F2
64×F1,F2
32×F1,F2
32×F1,F2
16×F1,F2
16×F1,F2
2048×F1,F2
Note : 1) User can select the frequency of F1 according to the table.
2) The CF logic output gives instantaneous real power information. The output is intended to be
used for calibration purpose, or interfacing to an MCU.
3) Performance Parameter Sections The Equation where:
Freq = Output frequency on F1 and F2 (Hz)
V1 = Differential rms voltage signal on Channel 1 (volts)
V2 = Differential rms voltage signal on Channel 2 (volts)
Gain = 1, 2, 8 or 16, depending on the PGA gain selection made using logic inputs G0
and G1
Page 5of 8
Tel 86-756-3392353 Fax 86-756-3392251
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ATT7021.PDF ] | |
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