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AS8228 Datasheet(PDF) 29 Page - ams AG

Part # AS8228
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

AS8228 Datasheet(HTML) 29 Page - ams AG

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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 29 of 123
The ideal number of pulses Ni is the ratio between the pulse rates, which is always >1. The formula for Ni is as
follows:
)
mconst
(
Rate
Pulse
LED
)
ref
(
PR
Ni
=
,
where PR(ref) is the reference meter constant.
The Pulse_lev (ideal) is calculated using the following formula:
)
default
(
lev
_
Pulse
I
A
40
V
V
230
)
ideal
(
lev
_
Pulse
max
mains
×
×
=
Example
The reference meter has a pulse rate, which is 10,000 times greater than the pulse rate of the AS8218 /
AS8228 LED output. During a calibration cycle we measure 11,000 pulses between two LED pulses. Therefore
the ideal Pulse_lev has to be changed by a factor of 10,000/11,000 = 0.909.
LED Meter Constant Selection (mconst, 9330h)
The LED pulses are derived directly from the fast internal pulses (204,800i/kWh).
The ‘mconst’ register in SREG specifies the LED pulse rate:
MSB
LSB
-
-
-
-
mconst[3]
mconst[2]
mconst[1]
mconst[0]
Bit
Symbol
Function
7
-
Not used
6
-
Not used
5
-
Not used
4
-
Not used
Bit3
Bit2
Bit1
Bit0
LED Pulse Rate
0
0
0
0
204,800
0
0
0
1
102,400
3
mconst[3]
0
0
1
0
51,200
0
0
1
1
25,600
0
1
0
0
12,800
0
1
0
1
6,400
2
mconst[2]
0
1
1
0
3,200
0
1
1
1
1,600
1
0
0
0
800
1
mconst[1]
1
0
0
1
400
1
0
1
0
200
1
0
1
1
100
0
mconst[0]
1
1
X
X
100



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