DESCRIPTION
The SAMES SA9108F Two Phase bidirec-
tional Power/Energy metering integrated
circuit generates pulse rate outputs for
positive and negative energy directions,
the frequency of which is proportional to the
power consumption. The SA9108F
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 two
phase power/energy metering integrated
circuit is ideally suited for applications such
as residential and industrial energy metering
and control.
The SA9108F integrated circuit is available
in 40 pin dual-in-line plastic (DIP-40), as
well as 44 pin plastic leaded chip carrier
(PLCC-44) package types.
SA9108F
TWO PHASE BIDIRECTIONAL POWER/ENERGY
METERING IC WITH INSTANTANEOUS PULSE OUTPUT
Package: DIP-40
1/12
PIN CONNECTIONS
4364
PDS039-SA9108F-001
Rev. B
09-01-97
sames
FEATURES
n
Performs bidirectional one or two phase
power and energy measurement
n
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
n
Operates over a wide temperature
range
n
Adaptable to different types of current
sensors
n
Excellent long term stability
n
Easily adaptable to different signal
levels
n
Precision voltage reference on-chip
n
Two pulse rate output formats available
n
Protected against ESD
DR-00940
TP11
11
COPP
CONP
OSC2
OSC1
TP18
TP17
SS
CIPP
CINP
V
16
17
18
19
20
12
13
14
15
CIN1
1
CIP2
CIN2
TP10
IIN1
IIP1
IIN2
IIP2
TP4
TP5
6
7
8
9
10
3
5
4
2
TP30
30
TP24
FOUT1
25
21
22
23
24
TP22
FOUT2
DIR
V
TP27
TP26
DD
29
28
27
26
VREF
CIP1
40
GND
35
IVP1
IVP2
TP32
TP31
34
31
32
33
COP1
CON1
CON2
COP2
36
37
38
39
SA9108F
sames
2/12
BLOCK DIAGRAM
PIN CONNECTIONS
Package: PLCC-44
N.C.
N.C.
1 2
3 4
3
TP32
DR-00941
IVP2
IVP1
GND
CON2
COP2
5
4
6
7
CON1
COP1
CIP1
1 0
9
8
1 1
TP27
V DD
N.C.
TP30
TP31
VREF
TP26
TP24
FOUT1
FOUT2
TP22
3 8
4 1
4 2
4 3
4 4
1
2
4 0
3 9
DIR
3 7
3 5
3 6
IIP2
2 1
TP4
1 6
CIN1
CIP2
CIN2
1 5
1 4
1 3
TP5
1 8
1 9
1 7
2 0
IIN1
IIP1
IIN2
OSC2
OSC1
TP18
TP17
SS
3 0
3 3
3 2
3 1
2 7
2 2
2 4
2 5
2 6
2 3
2 8
V
2 9
CIPP
TP10
TP11
COPP
CONP
N.C.
CINP
INTEG.
&
AVERAGE
TIMING & CONTROL
GND
DR-00942
V R E F
R E F
12 CONNECTIONS
FOR LOOPCAPS
IVP2
IVP1
IIP2
IIN2
IIP1
IIN1
ANALOG
SIGNAL
PRO-
CESSING
OSC
OSC1
OSC2
S S
V
V
D D
POWER
TO
PULSERATE
FOUT1
FOUT2
DIR
SA9108F
sames
3/12
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
* 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.
ELECTRICAL CHARACTERISTICS
(V
DD
= 5V over the temperature range -10C to +70C
#
, unless otherwise specified.)
Parameter
Symbol
Min Typ
Max Unit Condition
Supply Voltage
V
DD
-V
SS
4.5
5.5
V
Supply Current
I
DD
10
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
Digital Outputs:
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, FOUT2
f
p
0
64
Hz
Specified linearity
0
180
Hz
Min and max limits
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.
#
SA9108F
sames
4/12
PIN DESCRIPTION
Pin
Pin
PLCC-44 DIP-40
6
35
GND
Ground
42
28
V
DD
Positive Supply Voltage
29
16
V
SS
Negative Suply Voltage
5
34
IVP1
Analog input for Voltage : Phase 1
4
33
IVP2
Analog input for Voltage : Phase 2
18
6
IIN1
Inputs for current sensor : Phase 1
19
7
IIP1
20
8
IIN2
Inputs for current sensor : Phase 2
21
9
IIP2
32
19
OSC1
Connections for crystal or ceramic resonator
33
20
OSC2
(OSC1 = Input; OSC2 = Output)
35
21
FOUT1
Pulse rate outputs
37
23
FOUT2
39
25
DIR
Direction indication
9
38
CON1
Connections for outer loop capacitors of A/D
10
39
COP1
converters
8
37
CON2
7
36
COP2
26
13
CONP
25
12
COPP
13
1
CIN1
Connections for inner loop capacitors of A/D
11
40
CIP1
converters
15
3
CIN2
14
2
CIP2
28
15
CINP
27
14
CIPP
43
29
VREF
Connection for current setting resistor
41
27
TP27
Test Pin. Connect to V
SS
16
4
TP4
Manufacturer's test pins (Leave unconnected)
17
5
TP5
22
10
TP10
23
11
TP11
30
17
TP17
31
18
TP18
36
22
TP22
38
24
TP24
40
26
TP26
1
30
TP30
2
31
TP31
3
32
TP32
Designation Description
SA9108F
sames
5/12
PIN DESCRIPTION (Continued)
Pin
Pin
PLCC-44 DIP-40
12
NC
Not connected
24
NC
34
NC
44
NC
FUNCTIONAL DESCRIPTION
The SAMES SA9108F is a CMOS mixed signal Analog/Digital integrated circuit, which
performs two phase power/energy calculations over a dynamic range of greater than
1000:1, to an overall accuracy of better than Class 1.
The integrated circuit includes all the required functions for 2-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 SA9108F generates pulses, the frequency of which is proportional to the power
consumption. The pulse rate follows the instantenous power measured. Direction
information is also provided.
1.
Power Calculation
In the Application Circuit (Figure 1), the mains voltages from Line 1 and Line 2, are
converted to currents and applied to the voltage sense inputs IVP1 and IVP2. The
mains voltage (2 x 115 V) is divided down through voltage dividers to 14V. The
resulting input currents into the A/D converters are 14
A
RMS
through the resistors R
9
and R
10
.
For the current sense inputs the voltage drop across the current transformers'
terminating resistors are converted to currents of 16
A
RMS
for rated conditions, by
means of resistors R
5
, R
6,
(Phase 1) and R
7
, R
8
(Phase 2).
The signals providing the current information are applied to the current sensor inputs
IIN1, IIP1 and IIN2, IIP2.
In this configuration, with the mains voltage of 2 x 115 VAC and rated currents of
80A, the output frequency of the SA9108F energy metering integrated circuit at
FOUT1 is 64Hz. In this case 1 pulse will correspond to an energy consumption of
2 x 9.2 kW/64Hz = 287.5 Ws.
Designation Description
PDF 
ZIP