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SA9605A
THREE PHASE POWER/ENERGY METERING
IC WITH INSTANTANEOUS PULSE OUTPUT
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FEATURES
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Functionally similar to the SA9105E
and SA9105F, with reduced number of
external components
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Output frequency represents the abso-
lute sum of energy on all three phases
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Performs one, two or three phase power
and energy measurement
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Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
Operates over a wide temperature
range
Current transformers for sensing
Excellent long term stability
Easily adaptable to different signal
levels
Precision voltage reference on-chip
Pin selectable pulse rates
Supports tamper detection
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PIN CONNECTIONS
DESCRIPTION
The SAMES SA9605A is an enhancement
of the SA9105E and SA9105F, as no external
capacitors are needed for the A/D converters.
The SAMES SA9605A Three Phase Power/
Energy metering integrated circuit generates
a pulse rate output, the frequency of which
1
20
IIP2
is proportional to the absolute power con-
2
19
IIN2
sumption. The SA9605A performs the
18
3
IVN3
calculation for active power.
17
4
IIP3
The method of calculation takes the power
16
5
IIN3
factor into account.
VDD
6
15
Energy consumption is determined by the
14
FOUT1
7
power measurement being integrated over
13
time.
FOUT2
8
12
9
DIR
The output of this innovative universal three
phase power/energy metering integrated
11
OSC1
10
circuit, is ideally suited for applications such
DR-01109
as residential and industrial energy metering
and control.
The SA9605A integrated circuit is available
Package: DIP-20
in both 20-pin dual-in-line plastic (DIP-20),
SOIC-20
as well as 20-pin plastic small outline (SOIC-
20) package types.
4452
PDS039-SA9605A-001
Rev. B
IVP2
IIN1
IIP1
IVN1
GND
VREF
VSS
PGM1
PGM0
OSC2
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14-03-97
SA9605A
BLOCK DIAGRAM
PGM0 PGM1
VD D VS S
IVN1
IVN2
IVN3
IIP1
IIN1
IIP2
IIN2
IIP3
IIN3
GND
VREF
OSC1
ANALOG
INTEG.
SIGNAL
&
PRO-
AVERAGE
CESSING
POWER
TO
PULSE
RATE
FOUT1
FOUT2
DIR
REF
TIMING & CONTROL
OSC
OSC2
DR-01110
ABSOLUTE MAXIMUM RATINGS *
Parameter
Symbol
Supply Voltage
V
DD
-V
SS
Current on any Pin
I
PIN
Storage Temperature
T
STG
Operating Temperature
T
O
Current at any pin
I
P
Min
-0.3
-150
-40
-40
-100
Max
6.0
+150
+125
+85
+100
Unit
V
mA
°C
°C
mA
* 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 conditions above those indicated in the operation sections of this
specification, is not implied. Exposure to Absolute Maximum Ratings for extended
periods may affect device reliability.
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SA9605A
ELECTRICAL CHARACTERISTICS
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10°C to +70°C
#
, unless otherwise
specified.)
Parameter
Operating Temperature
Range
#
Supply Voltage
Supply Current
Nonlinearity of
Power Calculation
Symbol
T
O
V
DD
-V
SS
I
DD
Min Typ
-25
4.5
Max Unit Condition
+85
5.5
15
+0.3
°C
V
mA
%
1% - 100% of
rated power
Peak value
Peak value
I
OL
= 5mA
I
OH
= -2mA
Specified linearity
Min and max limits
User selectable
-0.3
Current Sensor Inputs (Differential)
Input Current Range
I
II
Voltage Sensor Inputs (Asymmetric)
Input Current Range
I
IV
Pins FOUT1, FOUT2, DIR
Output Low Voltage
Output High Voltage
Pulse Rate:
FOUT1
FOUT2
Oscillator
Pin VREF
Ref. Current
Ref. Voltage
#
-25
-25
+25
+25
V
SS
+1
µA
µA
V
V
Hz
Hz
V
OL
V
OH
f
p
V
DD
-1
10
1160
3000
Recommended crystal:
TV colour burst crystal, f = 3.5795 MHz
With R = 24 kΩ
-I
R
45
50
55
µA connected to V
SS
V
R
1.1
1.3
V Referred to V
SS
Extended Operating Temperature Range available on request.
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SA9605A
PIN DESCRIPTION
Pin
16
6
14
17
20
3
19
18
2
1
5
4
10
11
7
8
9
12
13
15
Designation
Description
GND
V
DD
V
SS
IVN1
IVN2
IVN3
IIN1
IIP1
IIN2
IIP2
IIN3
IIP3
OSC1
OSC2
FOUT1
FOUT2
DIR
PGM0
PGM1
VREF
Ground
Positive Supply Voltage
Negative Suply Voltage
Analog input for Voltage : Phase 1
Analog input for Voltage : Phase 2
Analog input for Voltage : Phase 3
Inputs for Current sensor : Phase 1
Inputs for Current sensor : Phase 2
Inputs for Current sensor : Phase 3
Connections for crystal or ceramic resonator
(OSC1 = Input ; OSC2 = Output)
Pulse rate outputs
Direction indicator
FOUT2 Frequency select pins
Connection for current setting resistor
FUNCTIONAL DESCRIPTION
The SAMES SA9605A is a CMOS mixed signal Analog/Digital integrated circuit, which
performs three phase power/energy calculations over a range of 1000:1, to an overall
accuracy of better than Class 1.
The SA9605A in both DIP-20 and SOIC-20 package options is functionally similar to the
SA9105E and SA9105F with the advantage of no external loop capacitors.
The integrated circuit includes all the required functions for 3-phase power and energy
measurement such as 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 SA9605A generates pulses, the frequency of which is proportional to the power
consumption. Two frequency outputs (FOUT1 and FOUT2) are available. The pulse rate
follows the instantaneous power measured.
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SA9605A
1.
Power Calculation
In the Application Circuit (Figure 1), the mains voltages from Line 1, Line 2 and Line
3, are converted to currents and applied to the voltage sense inputs IVN1, IVN2 and
IVN3.
The current levels on the voltage sense inputs are derived from the mains voltage
(3 x 230 VAC) being divided down through voltage dividers to 14V. The resulting
input currents into the A/D converters are 14µA through the resistors R
15
, R
16
and
R
17
.
For the current sense inputs the voltage drop across the current transformers
terminating resistors are converted to currents of 16µA for rated conditions, by
means of resistors R
8
, R
9
(Phase 1); R
10
, R
11
(Phase 2); and R
12
, R
13
(Phase 3).
The signals providing the current information are applied to the current sensor
inputs: IIN1, IIP1; IIN2, IIP2; and IIN3, IIP3.
In this configuration, with the mains voltage of 3 x 230 V and rated currents of 80A,
the output frequency of the SA9605A energy metering integrated circuit at FOUT1
is 1.16kHz. In this case 1 pulse will correspond to an energy consumption of 3 x 18.4
kW/1160Hz = 47.6 Ws.
The output frequency at FOUT1 and FOUT2 represents the absolute sum of the
energy measured on all three phases, regardless of the direction of energy flow
through the current sensors. This measurement method will assist meter
manufacturers to circumvent meter tampering by reversal of the phases.
2.
Analog Input Configuration
The current and voltage sensor inputs are illustrated below.
These inputs are protected against electrostatic discharge through clamping
diodes, in conjunction with the amplifiers input configuration.
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 processing circuitry.
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