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AS8267 Datasheet(PDF) 35 Page - ams AG

Part # AS8267
Description  Single-Phase 2-Current Energy Measurement Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os
PDF  136 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS8267 Datasheet(HTML) 35 Page - ams AG

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Data Sheet AS8267 / AS8268
Revision 1.0, 19-Jun-07
Page 35 of 136
The following flowchart describes how accumulators and registers work together:
Accumulate fast
pulses (np);
accumulate
squares (sos)
nsamp reached?
Add P_ACCU to
np-register
Transfer sos-
accus to registers
(MDR/sos)
Clear sos accus
and P_ACCU
ack reset by
MCU?
Reset np-register
(MDR)
N
Y
Y
N
Calculation of Apparent Power
[]
∑
∑
=
=
×
×
×
=
×
=
nsamp
1
i
2
i
nsamp
1
i
2
i
rms
rms
V
nsamp
1
I
nsamp
1
I
V
VA
S
i
_
sos
nsamp
1
v
_
sos
nsamp
1
×
×
×
=
Calculation of Real Power
[]
rate
pulse
fast
,i
1
np
W
P
×
=
[]
Ws
800
,
204
600
,
3
000
,
1
1
rate
pulse
fast
,i
×
=
Calculation of Reactive Power
[]
2
2
P
S
VAr
Q
−
=
Calculation of cos(
ϕ)
()
S
P
cos
=
ϕ



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