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AS8218 Datasheet(PDF) 120 Page - ams AG

Part # AS8218
Description  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS8218 Datasheet(HTML) 120 Page - ams AG

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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 120 of 123
Due to non-ideal components a different RMS value is calculated: RMS_I(actual). From this, the required
calibration factor is calculated using the following formula:
)
actual
(I
_
RMS
)
ideal
(I
_
RMS
i
_
cal
=
The following formula calculates the actual value to be programmed into the calibration registers (cal_v; cal_i1;
cal_i2):
))
768
,
32
i
_
cal
(
round
(
hex
)
reg
(i
_
cal
×
=
Fast internal pulse rate (PRint):
The Fast Pulse Gen output always has the same relationship with the LED pulse rate, which is defined by
mconst. Only if LED is calibrated to a meter constant different from those provided in the mconst table, will the
fast internal pulse rate be different.
[]
kWh
/
i
mconst
Rate
Pulse
et
arg
T
800
,
204
PRint
×
=
Where mconst is the meter constant.
[]
Ws
PR
600
,
3
000
,
1
i
1
int
×
=
Active power calibration (Pulse_lev):
The Pulse_lev is specified such that a typical pulse rate of 204,800i/kWh can be achieved.
During energy pulse calibration the correct Pulse_lev is determined in order to get the desired pulse rate.
The IC default value for Pulse_lev is defined for Imax=40A and Vmains=230V.
Default Pulse_lev:
570,950
The formula for calculating the ideal Pulse_lev is as follows:
)
default
(
lev
_
Pulse
I
A
40
V
V
230
)
ideal
(
lev
_
Pulse
max
mains
×
×
=
The standard or reference meter pulses are counted between two pulses from the meter under test. From the
deviation the corrected Pulse_lev may be calculated.
Na
Ni
)
ideal
(
lev
_
Pulse
)
corrected
(
lev
_
Pulse
×
=
,
Where Ni is the ideal number of pulses and Na is the actual number of pulses (pcnt register in MPIO).
The ideal number of pulses Ni is the ratio between the pulse rates, which is always >1. The formula for Ni is as
follows:



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