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SA2002D Scheda tecnica(PDF) 5 Page - Sames

Il numero della parte SA2002D
Spiegazioni elettronici  Single Phase Kilowatt-hour Metering IC for Mechanical Display Applications
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Produttore elettronici  SAMES [Sames]
Homepage  http://www.sames.co.za
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The current and voltage sense inputs are both identical. Both
inputs are differential current driven up to ±25µA peak. One
input of the voltage sense amplifier is internally connected to
GND. This is possible because the voltage sense input is much
less sensitive to externally induced parasitic signals compared
to the current sense inputs.
ELECTROSTATIC DISCHARGE (ESD)
PROTECTION
POWER CONSUMPTION
VREF
Current sense input (IIP and IIN)
Voltage Sense Input (IVP)
The SA2002D integrated circuit's inputs/outputs are protected
against ESD.
The power consumption rating of the SA2002D integrated
circuit is less than 25mW.
A bias resistor of 24k
sets optimum bias and reference
conditions on chip. Calibration of the SA2002D should be done
on the voltage input as described in Typical Applications.
Figure 3 on page 4 shows the typical connections for the
current sensor input. The resistor R1 and R2 define the current
level into the current sense inputs of the SA2002D. At
maximum rated current the resistor values should be selected
for input currents of 16µA
.
The values for resistors R1 and R2 can be calculated as
follows:
R1 = R2 = (I /16µA) x RSH/2
Where I
=
Line current
RSH
=
Shunt resistor or termination
Resistor if a CT is used as the current sensor.
The value of RSH, if used as the CT's termination resistor,
should be less than the DC resistance of the CT's secondary
winding. The voltage drop across RSH should not be less than
16mV
at rated currents.
The current into the A/D converter should be set at 14µA
at
nominal mains voltage. The voltage sense input saturates at
an input current of ±25µA peak. Referring to Figure 3 the
typical connections for the voltage sense input is illustrated.
Resistors R3, R4 and R5 set the current for the voltage sense
input. The mains voltage is divided down to 14V
. The current
into the A/D converter input is set at 14µA
via resistor R5.
INPUT SIGNALS
W
RMS
L
L
RMS
RMS
RMS
RMS
Rated condition select (R0, R1, R2)
The rated condition select pins R0, R1 and R2 are inputs,
which configure the SA2002D for different rated conditions.
This feature eliminates the need for different stepper motor
gear ratios. The LED pulse output follows the average power
consumption measured.
*This figure not in parenthesis indicates that a MOP pulse
followed by a MON pulse is treated as one energy pulse. The
figure inside parenthesis means that a MOP pulse followed by
a MON pulse is treated as two energy pulses.
The Motor pulse rate is not restricted to 100 (200) pulses/kWh.
The following examples show how different LED and motor
pulse rates can be achieved:
Example 1. A manufacturer designing a 220V/10A meter can
choose to have the pins R2, R1 and R0 connected as for a
220V/20A (R2=0, R1=0 and R0=1). In comparison to table 1
the Rated Condition is now half (2200W), this in turn doubles
the LED and Motor Pulse output rates as shown in the
following table:
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
220V/10A
220V/20A
220V/40A
220V/80A
220V/6A
220V/30A
220V/60A
Test Mode
6400
3200
1600
800
6400
3200
1600
Test Mode
100 (200)
100 (200)
100 (200)
100 (200)
100 (200)
100 (200)
100 (200)
-
R2 R1 R0
Rated
Condition
LED Output
(Pulses/
KWh)
Motor Pulse
Rate (Pulses/
KWh)*
Table 1
0
0
1
220V/10A
6400
100 (200)
R2 R1 R0
Rated
Condition
LED Output
(Pulses/
KWh)
Motor Pulse
Rate (Pulses/
KWh)*
Example 2. A manufacturer designing a 220V/80A meter can
choose to have the pins R2, R1 and R0 connected as for a
220V/40A (R2=0, R1=0 and R0=1). In comparison to table 1
the Rated Condition has doubled (17600W), this in turn halves
the LED and Motor Pulse output rates as shown in the
following table:
0
1
0
220V/80A
800
50 (100)
R2 R1 R0
Rated
Condition
LED Output
(Pulses/
KWh)
Motor Pulse
Rate (Pulses/
KWh)*


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