Single Phase Bi-directional Power / Energy
Metering IC with Instantaneous Pulse Output
SA2002H
FEATURES
+
Functionally compatible with the SA9602H with reduced
external components
sames
+
+
+
+
+
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
+
+
+
Bi-directional power and energy measurement
Meets the IEC 521/1036 Specification requirements for
Class 1 AC Watt hour meters
Protected against ESD
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.
V
DD
V
SS
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.
IIP
POWER
IIN
INTEGRATOR
ANALOG
SIGNAL
PROCESSING
VOLTAGE
REF.
IVP
GND
OSC
TIMING
TO
FREQUENCY
POWER
FOUT
DIR*
FMO*
DR-01147
VREF
*FMO and DIR not availble in DIP-8 package type
Figure 1: Block diagram
SA2002H (REV. 5)
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17-08-00
SA2002H
ELECTRICAL CHARACTERISTICS
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10°C to +70°C
#
, unless otherwise specified.)
Parameter
Operating temp. Range
Supply Voltage: Positive
Supply Voltage: Negative
Supply Current: Positive
Supply Current: Negative
Current Sensor Inputs (Diffferential)
Input Current Range
Voltage Sensor Input (Asymmetrical)
Input Current Range
Pin FOUT, FMO, DIR
Output High Voltage
Output Low Voltage
Pulse Rate FOUT
sames
Symbol
T
O
V
DD
V
SS
I
DD
I
SS
Min
-25
2.25
-2.75
Typ
Max
+85
2.75
-2.25
Unit
°C
V
V
mA
mA
Condition
3
3
5
5
I
II
-25
+25
µA
Peak value
I
IV
V
OL
V
OH
f
p
-25
V
DD
-1
+25
µA
V
V
Hz
Hz
Hz
µs
µs
Peak value
V
SS
+1
1360
5
0
1600
3000
71.55
143.1
45
1.1
50
55
1.3
At rated input conditions
Specified linearity
Min and Max frequency
Positive energy flow
Negative energy flow
With R = 24kW
connected to V
SS
Reference to V
SS
Pulse Width FOUT
t
pp
t
pn
-I
R
V
R
Pin VREF
Ref. Current
Ref. Voltage
µA
V
# Extended Operating Temperature Range available on request.
ABSOLUTE MAXIMUM RATINGS*
Parameter
Supply Voltage
Current on any pin
Storage Temperature
Operating Temperature
Symbol
V
DD
-V
SS
I
PIN
T
STG
T
O
Min
-0.3
-150
-40
-25
Max
6.0
+150
+125
+85
Unit
V
mA
°C
°C
*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.
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3
SA2002H
sames
16
Pin
16
20
Pin
20
PIN DESCRIPTION
8
Pin
8
14
Pin
14
Designation
GND
Description
Analog Ground. The voltage to this pin should be mid-way
between V
DD
and V
SS
.
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.
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.
Analog Input for Voltage. The current into the A/D converter
should be set at 14µA
RMS
at nominal mains voltage. The
voltage sense input saturates at an input current of ±25µA peak.
Inputs for current sensor. The shunt resistor voltage from each
channel is converted to a current of 16µA
RMS
at rated conditions.
The current sense input saturates at an input current of ±25µA
peak.
This pin provides the connection for the reference current setting
resistor. A 24kW resistor connected to V
SS
set the optimum
operating condition.
Pulse rate output. Refer to pulse output format for a description
of the pulse rate.
Direction output. The direction of the energy flow is indicated on
this output.
Voltage sense zero crossover. The FMO output generates pulses
on energy rising edge of the mains voltage.
Leave pins unconnected.
4
5
5
8
V
DD
6
10
9
14
V
SS
7
13
15
19
IVP
1, 2
1, 2
1, 2
1, 2
IIN, IIP
3
5
N.A.
N.A.
3
8
9
11
4
6
7
12
3
6
7
11
4
8
10
12
13
14
3
12
13
15
4
5
6
7
9
10
11
16
17
18
VREF
FOUT
DIR
FMO
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
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SA2002H
sames
IIN
IIP
VREF
1
2
3
4
5
6
7
14
13
12
11
10
9
8
GND
IVP
TP4
FMO
V
SS
DIR
FOUT
IIN
IIP
VREF
V
DD
1
2
3
4
dr-01487
8
7
6
5
GND
IVP
V
SS
FOUT
TP1
V
DD
TP2
TP3
dr-01488
Figure 2: Pin connections: Package: DIP-8
Figure 3: Pin connections: Package: DIP-14
IIN
IIP
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND
IVP
TP10
TP9
TP8
FMO
V
SS
DIR
FOUT
TP7
IIN
IIP
VREF
TP1
V
DD
FOUT
DIR
TP2
1
2
3
4
5
6
7
8
DR-01489
16
15
14
13
12
11
10
9
GND
IVP
TP6
TP5
TP4
FMO
TP3
V
SS
VREF
TP1
TP2
TP3
TP4
V
DD
TP5
TP6
DR-01490
Figure 4: Pin connections: Package: SOIC-16
Figure 5: Pin connections: Package: DIP-20, SOIC-20
ORDERING INFORMATION
Part Number
SA2002HPA
SA2002HPA
SA2002HPA
SA2002HSA
SA2002HSA
Package
DIP-8
DIP-14
DIP-20
SOIC-16
SOIC-20
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SA2002H
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.
sames
For the voltage sensor input, the mains voltage (230VAC) is
divided down through a divider (R3, R4 and P1) to 14V
RMS
. The
current into the A/D converter input is set at 14µA
RMS
at nominal
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
I
and A
V
generate virtual shorts on the signal inputs. Exact duplications
of the input currents are generated for the analog signal
processing circuitry.
POWER CALCULATION
In the application circuit (figure 6), the voltage drop across the
shunt will be between 0 and 16mV
RMS
(0 to 80A through a shunt
resistor of 200µW) The voltage is converted to a current of
between 0 and 16uA
RMS
, by means of resistors R1 and R2. The
current sense inputs saturates at an input current of ±25µA
peak.
VDD
N
Supply
L
GND
VSS
U1
IIN
R2
IIP
VDD
VDD
IIN
IIP
V DD
CURRENT
SENSOR
INPUTS
VSS
VDD
A
I
RSH
R1
VSS
R3
R5
R4
GND
IVP
GND
FOUT
DIR
FMO
Pulse output
Fwd/Rev. Energy
Zero crossing
IVP
VOLTA GE
SENSOR
INPUT
VDD
N
P1
L
GND
R6
VREF
VSS
SA2002H
V SS
A
V
DR-01587
VSS
GND
DR-01148
Figure 6: Application circuit
Figure 7: Internal analog input configuration
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Embedded System
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