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SA9605A
THREE PHASE POWER/ENERGY METERING
IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES
n Functionally similar to the SA9105E n Operates over a wide temperature
and SA9105F, with reduced number of
range
external components
n Current transformers for sensing
n Output frequency represents the abso- n Excellent long term stability
lute sum of energy on all three phases n Easily adaptable to different signal
n Performs one, two or three phase power
levels
and energy measurement
n Precision voltage reference on-chip
n
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
n
Pin selectable pulse rates
meters
n Supports tamper detection
DESCRIPTION
PIN CONNECTIONS
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
is proportional to the absolute power con-
sumption. The SA9605A performs the
calculation for active power.
The method of calculation takes the power
factor into account.
Energy consumption is determined by the
power measurement being integrated over
time.
IIP2 1
IIN2 2
IVN3 3
IIP3 4
IIN3 5
VDD 6
FOUT1 7
FOUT2 8
20 IVP2
19 IIN1
18 IIP1
17 IVN1
16 GND
15 VREF
14 VSS
13 PGM1
The output of this innovative universal three
phase power/energy metering integrated
circuit, is ideally suited for applications such
as residential and industrial energy metering
and control.
DIR 9
OSC1 10
DR-01109
12 PGM0
11 OSC2
The SA9605A integrated circuit is available
in both 20-pin dual-in-line plastic (DIP-20),
as well as 20-pin plastic small outline (SOIC-
20) package types.
4452
Package: DIP-20
SOIC-20
PDS039-SA9605A-001 Rev. B
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14-03-97

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SA9605A
BLOCK DIAGRAM
PGM0 PGM1 VD D VS S
IVN1
IVN2
IVN3
IIP1
IIN1
IIP2
IIN2
IIP3
IIN3
GND
VREF
ANALOG
SIGNAL
PRO-
CESSING
INTEG.
&
AVERAGE
POWER
TO
PULSE
RATE
REF T I M I N G & C O N T R O L
OSC
FOUT1
FOUT2
DIR
OSC1
OSC2
DR-01110
ABSOLUTE MAXIMUM RATINGS *
Parameter
Symbol
Min
Max
Unit
Supply Voltage
Current on any Pin
Storage Temperature
Operating Temperature
Current at any pin
VDD-VSS
IPIN
T
STG
T
O
IP
-0.3
-150
-40
-40
-100
6.0
+150
+125
+85
+100
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
(VDD = 2.5V, VSS = -2.5V, over the temperature range -10°C to +70°C#, unless otherwise
specified.)
Parameter
Symbol Min Typ Max Unit Condition
Operating Temperature
Range #
T
O
-25
+85 °C
Supply Voltage
Supply Current
Nonlinearity of
Power Calculation
VDD-VSS
I
DD
4.5
-0.3
5.5 V
15 mA
+0.3 % 1% - 100% of
rated power
Current Sensor Inputs (Differential)
Input Current Range
III
Voltage Sensor Inputs (Asymmetric)
-25
+25 µA Peak value
Input Current Range
Pins FOUT1, FOUT2, DIR
Output Low Voltage
Output High Voltage
Pulse Rate: FOUT1
I
IV
VOL
V
OH
f
p
-25
V -1
DD
10
+25 µA Peak value
VSS+1 V
V
1160 Hz
3000 Hz
IOL = 5mA
I = -2mA
OH
Specified linearity
Min and max limits
FOUT2
User selectable
Oscillator
Pin VREF
Ref. Current
Ref. Voltage
Recommended crystal:
TV colour burst crystal, f = 3.5795 MHz
With R = 24 k
-I 45 50 55 µA connected to V
R SS
VR 1.1
1.3 V Referred to VSS
# Extended Operating Temperature Range available on request.
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SA9605A
PIN DESCRIPTION
Pin Designation
Description
16 GND Ground
6 VDD Positive Supply Voltage
14 V Negative Suply Voltage
SS
17 IVN1 Analog input for Voltage : Phase 1
20 IVN2 Analog input for Voltage : Phase 2
3 IVN3 Analog input for Voltage : Phase 3
19 IIN1 Inputs for Current sensor : Phase 1
18 IIP1
2 IIN2 Inputs for Current sensor : Phase 2
1 IIP2
5 IIN3 Inputs for Current sensor : Phase 3
4 IIP3
10 OSC1 Connections for crystal or ceramic resonator
11 OSC2 (OSC1 = Input ; OSC2 = Output)
7 FOUT1 Pulse rate outputs
8 FOUT2
9 DIR Direction indicator
12 PGM0 FOUT2 Frequency select pins
13 PGM1
15 VREF 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 R8, R9 (Phase 1); R10, R11 (Phase 2); and R12, R13 (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 and A generate virtual
IV
shorts on the signal inputs. Exact duplications of the input currents are generated
for the analog processing circuitry.
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