FEATURES
+
Functionally compatible with the SA9602H with reduced
external components
+
Bi-directional power and energy measurement
+
Meets the IEC 521/1036 Specification requirements for
Class 1 AC Watt hour meters
+
Protected against ESD
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Single Phase Bi-directional Power / Energy
Metering IC with Instantaneous Pulse Output
SA2002H
1/12
SA2002H (REV. 5)
17-08-00
+
Total power consumption rating below 25mW
+
Adaptable to different types of current sensors
+
Operates over a wide temperature range
+
Precision voltage reference on-chip
+
Precision oscillator on-chip
DESCRIPTION
The SAMES SA2002H is an enhancement of the SA9602H, as
the circuit contains the oscillator on chip.
The SAMES SA2002H single phase bi-directional
power/energy metering integrated circuit generates a pulse
rate output with a frequency proportional to the power
consumption.
The SA2002H performs a calculation for active power. The
method of calculation takes the power factor into account.
Energy consumption can be determined by the power
measurement being integrated over time.
This innovative universal single-phase power/energy metering
integrated circuit is ideally suited for energy calculations in
applications such as residential municipal metering and factory
energy metering and control.
The SA2002H integrated circuit is available in 8, 14 and 20 pin
dual-in-line plastic (DIP) as well as 16 and 20 pin small outline
(SOIC) package types.
Figure 1: Block diagram
IIP
IIN
IVP
GND
VREF
DR-01147
FMO*
POWER
TO
FREQUENCY
DIR*
FOUT
V
DD
V
SS
POWER
INTEGRATOR
ANALOG
SIGNAL
PROCESSING
TIMING
OSC
VOLTAGE
REF.
*FMO and DIR not availble in DIP-8 package type
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage
V -V
-0.3
6.0
V
DD
SS
Current on any pin
I
-150
+150
mA
PIN
Storage Temperature
T
-40
+125
C
STG
Operating Temperature
T
-25
+85
C
O
*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress
rating only. Functional operation of the device at these or any other condition above those indicated in the operational sections of
this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability.
Parameter
Symbol
Min
Max
Unit
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ELECTRICAL CHARACTERISTICS
#
(V = 2.5V, V = -2.5V, over the temperature range -10C to +70C , unless otherwise specified.)
DD
SS
Operating temp. Range
Supply Voltage: Positive
Current Sensor Inputs (Diffferential)
Input Current Range
Voltage Sensor Input (Asymmetrical)
Input Current Range
Pin FOUT, FMO, DIR
Output High Voltage
Output Low Voltage
C
V
A
A
V
V
T
O
V
DD
I
II
I
IV
V
OL
V
OH
-25
-25
-25
2.25
V -1
DD
V +1
SS
+25
+25
+85
2.75
Peak value
Peak value
Condition
Unit
Max
Typ
Min
Symbol
Parameter
Supply Voltage: Negative
V
V
SS
-2.75
-2.25
Supply Current: Positive
I
DD
5
3
mA
Supply Current: Negative
I
SS
5
3
mA
Positive energy flow
Negative energy flow
Pulse Width FOUT
s
s
t
pp
t
pn
71.55
143.1
# Extended Operating Temperature Range available on request.
Pulse Rate FOUT
At rated input conditions
Specified linearity
Min and Max frequency
Hz
Hz
Hz
1600
3000
1360
5
0
f
p
With R = 24kW
connected to V
SS
Reference to V
SS
Pin VREF
Ref. Current
Ref. Voltage
A
V
45
1.1
55
1.3
-I
R
V
R
50
3/12
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PIN DESCRIPTION
8
Pin
14
Pin
16
Pin
20
Pin
Designation
Description
8
14
16
20
GND
Analog Ground. The voltage to this pin should be mid-way
between V and V .
DD
SS
4
5
5
8
V
DD
Positive supply voltage. The voltage to this pin is typically +2.5V
if a shunt resistor is used for current sensing or in the case of a
current transformer a +5V supply can be applied.
6
10
9
14
V
SS
Negative supply voltage. The voltage to this pin is typically -2.5V
if a shunt resistor is used for current sensing or in the case of a
current transformer a 0V supply can be applied.
7
13
15
19
IVP
Analog Input for Voltage. The current into the A/D converter
should be set at 14A
at nominal mains voltage. The
RMS
voltage sense input saturates at an input current of 25A peak.
1, 2
1, 2
1, 2
1, 2
IIN, IIP
Inputs for current sensor. The shunt resistor voltage from each
channel is converted to a current of 16A
at rated conditions.
RMS
The current sense input saturates at an input current of 25A
peak.
3
3
3
3
VREF
This pin provides the connection for the reference current setting
resistor. A 24kW resistor connected to V set the optimum
SS
operating condition.
5
8
6
12
FOUT
Pulse rate output. Refer to pulse output format for a description
of the pulse rate.
4
4
4
6
8
5
7
10
6
12
12
7
9
14
10
11
16
17
18
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
Leave pins unconnected.
13
N.A.
9
7
13
DIR
Direction output. The direction of the energy flow is indicated on
this output.
N.A.
11
11
15
FMO
Voltage sense zero crossover. The FMO output generates pulses
on energy rising edge of the mains voltage.
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Figure 2: Pin connections: Package: DIP-8
Figure 4: Pin connections: Package: SOIC-16
Figure 3: Pin connections: Package: DIP-14
Figure 5: Pin connections: Package: DIP-20, SOIC-20
Part Number
SA2002HPA
SA2002HPA
SA2002HPA
SA2002HSA
SA2002HSA
Package
DIP-8
DIP-14
DIP-20
SOIC-16
SOIC-20
ORDERING INFORMATION
1
IIN
GND
IIP
IVP
V
SS
VREF
V
DD
FOUT
2
3
4
5
6
7
8
dr-01487
1
IIN
GND
IIP
IVP
DIR
TP4
FOUT
VREF
TP1
V
DD
TP2
TP3
FMO
V
SS
2
3
4
5
6
9
8
7
10
11
12
13
14
dr-01488
DR-01489
1
IIN
GND
IIP
IVP
FMO
TP6
V
SS
VREF
TP1
TP2
FOUT
DIR
V
DD
TP5
TP3
2
3
4
5
6
11
10
9
8
7
12
13
14
15
16
TP4
DR-01490
1
IIN
GND
IIP
IVP
FMO
TP10
V
SS
VREF
TP1
TP2
TP3
TP4
V
DD
TP9
TP8
DIR
FOUT
TP5
TP6
TP7
2
3
4
5
6
15
14
13
12
11
10
9
8
7
16
17
18
19
20
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SA2002H
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FUNCTIONAL DESCRIPTION
The SA2002H is a CMOS mixed signal Analog/Digital
integrated circuit, which performs power/energy calculations
across a power range of 1000:1, to an overall accuracy of
better than Class 1.
The integrated circuit includes all the required functions for 1-
phase power and energy measurement such as two
oversampling A/D converters for the voltage and current sense
inputs, power calculation and energy integration. Internal
offsets are eliminated through the use of cancellation
procedures. The SA2002H generates pulses, the frequency of
which is proportional to the measured power consumption.
One frequency output (FOUT) is available. The pulse rate
follows the instantaneous power consumption measured.
POWER CALCULATION
In the application circuit (figure 6), the voltage drop across the
shunt will be between 0 and 16mV
(0 to 80A through a shunt
RMS
resistor of 200W) The voltage is converted to a current of
between 0 and 16uA
, by means of resistors R1 and R2. The
RMS
current sense inputs saturates at an input current of 25A
peak.
For the voltage sensor input, the mains voltage (230VAC) is
divided down through a divider (R3, R4 and P1) to 14V
. The
RMS
current into the A/D converter input is set at 14A
at nominal
RMS
mains voltage, via resistor R5 (1MW). P1 may be varied for
calibration purposes.
In this configuration, with a mains voltage of 230V and a
current of 80A, the output frequency measured on the FOUT
pin is 1360Hz. In this case one pulse on FOUT correspond to
an energy consumption of 18.4kW/1360Hz = 13.53Ws.
ANALOG INPUT CONFIGURATION
The input circuitry of the current and voltage sensor inputs is
illustrated in figure 7. These inputs are protected against
electrostatic discharge through clamping diodes. The
feedback loops from the outputs of the amplifiers A and A
I
V
generate virtual shorts on the signal inputs. Exact duplications
of the input currents are generated for the analog signal
processing circuitry.
Figure 6: Application circuit
Figure 7: Internal analog input configuration
GND
VDD
DR-01148
VOLTA GE
SENSOR
INPUT
IVP
SS
V
IIN
IIP
CURRENT
SENSOR
INPUTS
SS
V
SS
V
VDD
DD
V
A
V
A
I
DR-01587
R3
VDD
VREF
IIP
IIN
GND
IVP
VSS
FOUT
U1
SA2002H
R4
R5
R1
R2
R6
L
N
L
N
RSH
P1
GND
GND
VSS
VDD
GND
Supply
VDD
VSS
Pulse output
DIR
FMO
Fwd/Rev. Energy
Zero crossing
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ELECTROSTATIC DISCHARGE (ESD)
PROTECTION
The SA2002H integrated circuit's inputs/outputs are protected
against ESD.
POWER CONSUMPTION
The power consumption rating of the SA2002H integrated
circuit is less than 25mW.
INPUT SIGNALS
VREF
A bias resistor of 24kW set optimum bias conditions on chip.
Calibration of the SA2002H should be done on the voltage
input as described in Typical Applications.
Current sense input (IIP and IIN)
Figure 6 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 SA2002H. At maximum rated
current the resistor values should be selected for input currents
of 16A
.
RMS
Values for resistors R1 and R2 can be calculated as follows:
R1 = R2 = (I /16A) x RSH/2
L
Where I = Line current
L
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.
RMS
Voltage Sense Input (IVP)
The current into the A/D converter should be set at 14A
at
RMS
nominal mains voltage. The voltage sense input saturates at
an input current of 25A peak. Referring to figure 6 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
RMS
A/D converter input is set at 14A
via resistor R5.
RMS
OUTPUT SIGNALS
Pulse output (FOUT)
The output on FOUT is a pulse density signal representing the
instantaneous power/energy measurement as shown in figure
8. The pulse width on FOUT changes with the direction of
energy measurement by the device. The width of t is 71,5s
p
for positive energy and doubles if negative energy is
measured. The output frequency may be calculated using the
following formula:
2
f = 11.16 x FOUT x ( I x I ) / I
I
V
R
Where:
FOUT = Typical rated output frequency (1360Hz)
I = Input current on current sense input (16A at rated
I
conditions)
I = Input current on voltage sense input (16A at rated
V
conditions)
I = Reference current on VREF typically 50A
R
An integrated anti-creep function does not allow output pulses
on FOUT if no power is measured by the device.
Figure 8: FOUT instantaneous pulse output
POWER
DR-01282
FOUT
V x I
v
MAINS
P
t
t
t
t
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Direction indication (DIRO)
Note that the DIR output is not available in the DIP-8 package
type. Figure 9 shows the behavior of DIR, when energy
reversal takes place. The time period for the DIR signal to
change state, t , is the time it takes for the internal integrator
DIR
to count (down) from its present value to zero. Thus the energy
consumption rate determines the speed of change on DIR.
DR-01283
DIR
V
I
DIR
t
t
t
t
Figure 9: Measured energy direction on DIR
Mains zero crossing indication (FMO)
Note that the FMO output is not available in the DIP-8 package
type. The square wave signal of FMO indicates the polarity of
the mains voltage. Due to comparator offsets, the FMO low to
high transition can occur within a range as shown in figure 10.
The time between successive low to high transitions will be
equal to the mains voltage period.
Figure 10: Mains zero crossings on FMO
DR-01284
FMO
MAINS
t
V
t
t
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TYPICAL APPLICATION
In figure 11, the components required for stand alone power
metering application, is shown. The application uses a shunt
resistor for the mains current sensing. The meter is designed
for 220V/40A I
operation. The most important external
MAX
components for the SA2002H integrated circuit are the current
sense resistors, the voltage sense resistors as well as the bias
setting resistor.
BIAS RESISTOR
R13 defines all on-chip and reference currents. With
R13=24kW, optimum conditions are set. Device calibration is
done on the voltage input of the device.
SHUNT RESISTOR
The voltage drop across the shunt resistor at rated current
should be at least 20mV. A shunt resistor with a value of 625W
is chosen. The voltage drop across the shunt resistor is 25mV
at rated conditions (Imax). The power dissipation in the current
sensor is:
P=(40A) x 625W = 1W.
CURRENT SENSE RESISTORS
The resistors R6 and R7 define the current level into the
current sense inputs of the device. The resistor values are
selected for an input current of 16A on the current inputs of
the SA2002H at rated conditions. According to equation
described in the Current Sense inputs section:
R6 = R7 = ( I / 16A ) x RSH / 2
L
= 40A / 16A x 625W / 2
= 781.2W
A resistor with value of 820W is chosen, the 5% deviation from
the calculated value will be compensated for when calculating
resistor values for the voltage path.
VOLTAGE DIVIDER
The voltage divider is calculated for a voltage drop of 14V +
5%(14.7V). Equations for the voltage divider in figure 9 are:
RA = R1 + R2 + R3
RB = R12 || (R11+P1)
Combining the two equations gives:
(RA + RB) / 220V = RB / 14.7V
A 5k trimpot will be used in the voltage channel for meter
calibration. The center position on the pot is used in the
calculations. P1 = 2.5kW and values for resistors R11 = 22kW
and R12 =1MW is chosen.
Substituting the values will result in:
RB = 23.91kW
RA = RB x (230V/14.7V - 1) = 333kW so the resistor values of
R1, R2 and R3 are chosen to be 110kW.
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Figure 11: Application circuit using a shunt resistor for current sensing.
C
1
D
1
+
C
3
C
2
R
1
R
2
R
3
D
2
+
C
4
R
4
R
5
D
3
D
4
C
5
R
8
V
R
E
F
3
I
I
P
2
I
I
N
1
G
N
D
1
4
I
V
P
1
3
F
O
U
T
8
T
P
1
4
V
D
D
5
T
P
2
6
T
P
3
7
D
I
R
9
V
S
S
1
0
F
M
O
1
1
T
P
4
1
2
U
1
S
A
2
0
0
2
H
R
1
1
R
1
2
R
6
R
7
R
1
3
C
6
+
2
V
5
-
2
V
5
-
2
V
5
+
2
V
5
L
I
V
E
N
E
U
T
R
A
L
L
I
V
E
N
E
U
T
R
A
L
R
1
0
P
1
F
M
O
D
I
R
F
O
U
T
d
r
-
0
1
5
8
8
10/12
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Symbol
Description
Detail
SA2002H
Diode, Silicon, 1N4002
Diode, Silicon, 1N4002
Diode, Zener, 2.4V
Diode, Zener, 2.4V
Resistor, 110k, 1/4W, 1% metal
Resistor, 110k, 1/4W, 1% metal
Resistor, 110k, 1/4W, 1%, metal
Resistor, 680, 1/4W, 1%, metal
Resistor, 680, 1/4W, 1%, metal
Resistor, 820, 1/4W, 1%, metal
Resistor, 820, 1/4W, 1%, metal
Resistor, 47R, 2W, 5%, wire wound
Resistor, 22k 1/4W, 1%, metal
Resistor, 1M, 1/4W, 1%, metal
Resistor, 24k, 1/4W, 1%, metal
Trim pot, 5k, Multi turn
Capacitor, 220nF
Capacitor, 220nF
Capacitor, 100uF, 16V, electrolytic
Capacitor, 100uF, 16V, electrolytic
U1
D1
D2
D3
DIP-14
D4
R1
R2
R3
R4
R5
R6
R7
R8
R10
R11
R12
R13
P1
C1
C2
C3
C4
Shunt resistor
Parts List for Application Circuit: Figure 10
Note 1: Resistor (R6 and R7) values are dependant on the selected shunt resistor (R14) value.
Note 2: Capacitor C6 to be positioned as close as possible to supply pins.
Note 1
Note 1
Capacitor, 330nF, 250VAC
Capacitor, 820nF
C5
C6
Note 2
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NOTES:
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PM9607AP
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DISCLAIMER:
The information contained in this document is confidential and proprietary to South African Micro-Electronic Systems (Pty) Ltd
("SAMES") and may not be copied or disclosed to a third party, in whole or in part, without the express written consent of SAMES.
The information contained herein is current as of the date of publication; however, delivery of this document shall not under any
circumstances create any implication that the information contained herein is correct as of any time subsequent to such date.
SAMES does not undertake to inform any recipient of this document of any changes in the information contained herein, and
SAMES expressly reserves the right to make changes in such information, without notification, even if such changes would render
information contained herein inaccurate or incomplete. SAMES makes no representation or warranty that any circuit designed by
reference to the information contained herein, will function without errors and as intended by the designer.
Any sales or technical questions may be posted to our e-mail address below:
energy@sames.co.za
For the latest updates on datasheets, please visit our web site:
http://www.sames.co.za.
SOUTH AFRICAN MICRO-ELECTRONIC SYSTEMS
DIVISION OF LABAT TECHNOLOGIES (PTY) LTD
Tel: (012) 333-6021
Tel: Int +27 12 333-6021
Fax: (012) 333-8071
Fax: Int +27 12 333-807
1
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33 ELAND STREET
LYNN EAST 0039
REPUBLIC OF SOUTH AFRICA
33 ELAND STREET
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PRETORIA
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