AS8168 Ver la hoja de datos (PDF) - austriamicrosystems AG
Número de pieza
componentes Descripción
Fabricante
AS8168
Single Phase Average Energy Metering IC with On-Chip Calibration, Stepper Motor Drive and LED Output
austriamicrosystems AG
AS8168 Datasheet PDF : 30 Pages
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Data Sheet AS8168
Anti-Creep Threshold Setting
The anti-creep threshold is programmable to ensure that the set threshold lies between the anti-creep current, a current level
at which no pulses must be generated and the start current. The programmable threshold levels have been set to
accommodate the various specified base currents (IB) of the meter and if the meter is direct connection (shunt resistor) or
connection is through a current transformer. The formulae for calculating the appropriate thresholds are as follows:
Shunt:
ac
_ th
=
4 * IB
1000
*
1
5
= IStart
*
1
5
Current Transformer:
ac
_ th
=
2* IB
1000
*
1
5
= IStart
*
1
5
Parameter: Acreep_sel
(All values are given in mA, unless otherwise specified)
Setting
Ithreshold IB (A)
Imax(A)
(IB*4)
Imax(A)
(IB*6)
Ianticreep
Shunt
00
2.3
1.5
6
9
1.2
2.3
2.5
10
15
2
01
7.4
5
20
30
4
10
14.8
10
40
60
8
14.8
15
60
90
12
11
29.7
20
80
120
16
29.7
30
120
n/a
20
Istarting
Shunt
6
10
20
40
60
80
100
Ianticreep
CT
0.6
1
2
4
6
8
10
Istarting
CT
3
5
10
20
30
40
50
The default anti-creep threshold (ac_th) is set at 7.4mA, best suited to a 30A (IB*6) or 20A (IB*4) meter. The default anti-
creep is the programmed threshold setting, without any programming required to the AS8168.
Summary of Programmable Parameters
The AS8168 programming options, along with the default settings have been summarised in the table below:
I Gain CAL MON/MOP LED
Anti-Creep Threshold
20
8
100
100
2.32mA
16
16
200
200
7.43mA
4
32
400
400
14.90mA
64
800
800
29.70mA
1600
3200
6400
Note: The default settings have been highlighted.
Revision 1.2, 11-Feb-05
Page 9 of 30
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