SA4106A
Table 4: continued
Dividing Factors
DF_LED DF_MO
OUTPUT SIGNALS
IMAX
(A)
LED Output Motor Output
LED Output (LED)
The LED output pin provides a pulse output with a frequency
proportional to the average active energy consumption
measured when in STANDARD mode or FAST mode. A low
pass filter is applied to the instantaneous energy output
directly after multiplication. This filtering allows all
instantaneous components to be removed resulting in a
constant output frequency at constant energy input, even
over a short period of time. The delay of this filter is about
200ms.
(imp/kWh)
3200
1600
3200
1600
6400
3200
6400
3200
1600
800
(imp/kWh)
100
100
200
200
400
400
100
100
100
100
200
200
200
200
100
100
200
200
100
100
200
200
100
100
100
100
100
100
100
100
100
100
30
30
584
1168
584
1168
292
584
220
440
880
1760
220
440
880
1760
352
704
352
704
584
1168
292
584
220
440
880
1760
352
704
292
584
234
468
32
16
16
8
30
30
30
16
8
30
40
64
32
16
8
40
The LED output is primarily used for calibration purposes.
The Rated Condition Select inputs (R0, R1, R2, R3) and the
Fast Mode Select input (FMS) allow different nominal output
frequencies to be selected. The FMS input also allows
selection between STANDARD mode and FAST mode. The
LED output is active low. Figure 9 shows the LED output
waveform.
40
40
40
32
16
8
6400
3200
1600
800
40
40
40
4
In FAST mode the LED pulse output is set to a nominal
frequency of 5kHz at an input current of 16µARMS on both the
current and voltage channels.
50
32
16
16
8
3200
1600
3200
1600
1600
800
50
50
The nominal output frequency of the LED pin is given by
50
60
16
8
|
|
퐼푉푃 × 퐼퐼푃 × cos 휙
푓
= 5000 ×
ꢋꢌꢍ_ꢎ퐴푆ꢅ
60
162
…(3)
…(4)
60
16
8
3200
1600
3200
1600
800
in FAST mode and by
60
80
32
16
8
푓
ꢋꢌꢍ_ꢎ퐴푆ꢅ
푓
=
ꢋꢌꢍ_푆ꢅꢍ
80
퐷퐹_퐿퐸퐷
80
in STANDARD mode where
IVP and IIP are the analog input currents in µARMS on the
voltage and current sense inputs,
is the phase angle between the current and voltage signals
and
DF_LED is the LED divider selected by R0, R1, R2, R3 and
FMS according to Table 3.
80
4
400
100
100
120
120
150
150
16
8
1600
800
16
8
1600
800
16
8
1600
800
The timing values given below are based on the nominal
frequency value of the internal oscillator.
tL = 1/fLED_FAST in FAST mode (fLED_FAST as per Equation 3)
= 1/fLED_STD in STANDARD mode (fLED_STD as per
Equation 4)
tLP
tL
tLP = 91.5ms when tL > 183ms in STANDARD mode
= tL/2 when tL < 183ms in STANDARD mode
= 69μs in FAST mode
Figure 9: LED pulse output waveform
SPEC-1587 (REV. 5)
29-09-2017
12/18
SAMES [ SAMES ]
