THREE PHASE POWER/ENERGY METERING
IC WITH INSTANTANEOUS PULSE OUTPUT
1/14
4452
PDS039-SA9605A-001
Rev. B
14-03-97
sames
FEATURES
n
Functionally similar to the SA9105E
and SA9105F, with reduced number of
external components
n
Output frequency represents the abso-
lute sum of energy on all three phases
n
Performs one, two or three phase power
and energy measurement
n
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
Package:
DIP-20
SOIC-20
n
Operates over a wide temperature
range
n
Current transformers for sensing
n
Excellent long term stability
n
Easily adaptable to different signal
levels
n
Precision voltage reference on-chip
n
Pin selectable pulse rates
n
Supports tamper detection
PIN CONNECTIONS
SA9605A
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
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.
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.
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.
7
FOUT1
FOUT2
DIR
OSC1
8
9
10
DR-01109
IIP2
IIN2
IVN3
IIP3
IIN3
DD
V
2
6
4
5
3
1
14
V
SS
PGM1
PGM0
OSC2
11
12
13
IVP2
IIN1
IIP1
IVN1
GND
VREF
19
15
16
17
18
20
SA9605A
sames
2/14
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS *
Parameter
Symbol
Min
Max
Unit
Supply Voltage
V
DD
-V
SS
-0.3
6.0
V
Current on any Pin
I
PIN
-150
+150
mA
Storage Temperature
T
STG
-40
+125
C
Operating Temperature
T
O
-40
+85
C
Current at any pin
I
P
-100
+100
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.
T I M I N G & C O N T R O L
IIP3
REF
V R E F
G N D
IIN3
DR-01110
ANALOG
SIGNAL
PRO-
CESSING
IVN3
IIP2
IIN2
IIP1
IIN1
IVN1
IVN2
INTEG.
&
AVERAGE
OSC
OSC1
OSC2
PGM1
POWER
TO
PULSE
RATE
PGM0
S S
V
VDD
FOUT2
FOUT1
DIR
SA9605A
sames
3/14
ELECTRICAL CHARACTERISTICS
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10C to +70C
#
, unless otherwise
specified.)
Parameter
Symbol
Min Typ
Max Unit Condition
Operating Temperature
Range
#
T
O
-25
+85
C
Supply Voltage
V
DD
-V
SS
4.5
5.5
V
Supply Current
I
DD
15
mA
Nonlinearity of
Power Calculation
-0.3
+0.3
%
1% - 100% of
rated power
Current Sensor Inputs (Differential)
Input Current Range
I
II
-25
+25
A
Peak value
Voltage Sensor Inputs (Asymmetric)
Input Current Range
I
IV
-25
+25
A
Peak value
Pins FOUT1, FOUT2, DIR
Output Low Voltage
V
OL
V
SS
+1
V
I
OL
= 5mA
Output High Voltage
V
OH
V
DD
-1
V
I
OH
= -2mA
Pulse Rate:
FOUT1
f
p
10
1160
Hz
Specified linearity
3000
Hz
Min and max limits
FOUT2
User selectable
Oscillator
Recommended crystal:
TV colour burst crystal, f = 3.5795 MHz
Pin VREF
With R = 24 k
Ref. Current
-I
R
45
50
55
A
connected to V
SS
Ref. Voltage
V
R
1.1
1.3
V
Referred to V
SS
#
Extended Operating Temperature Range available on request.
SA9605A
sames
4/14
PIN DESCRIPTION
Pin
16
GND
Ground
6
V
DD
Positive Supply Voltage
14
V
SS
Negative Suply Voltage
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
Designation Description
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.
SA9605A
sames
5/14
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 14
A 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 16
A 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.
PDF 
ZIP