SA9108F
TWO PHASE BIDIRECTIONAL POWER/ENERGY
METERING IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES
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Performs bidirectional one or two phase
power and energy measurement
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
Operates over a wide temperature
range
Adaptable to different types of current
sensors
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Excellent long term stability
Easily adaptable to different signal
levels
Precision voltage reference on-chip
Two pulse rate output formats available
Protected against ESD
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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.
PIN CONNECTIONS
CIN1
CIP2
CIN2
TP4
TP5
IIN1
IIP1
IIN2
IIP2
1
2
3
4
5
6
7
8
9
40
39
CIP1
COP1
38
CON1
37
CON2
COP2
35
GND
34
IVP1
36
33
IVP2
32
TP32
31
TP10
10
TP11
11
COPP
12
CONP
CIPP
14
CINP
15
V SS
16
TP17
17
TP18
18
OSC1
19
OSC2
20
DR-00940
13
TP31
30
TP30
VREF
28
V DD
29
TP27
26
TP26
27
25
24
DIR
TP24
23
FOUT2
22
TP22
21
FOUT1
Package: DIP-40
1/12
4364
PDS039-SA9108F-001
Rev. B
09-01-97
SA9108F
PIN CONNECTIONS
DIR
TP24
FOUT2
TP22
FOUT1
N.C.
OSC2
OSC1
TP18
TP17
V SS
39 38
37 36
35 34
33
32
31 30
29
TP26
TP27
V DD
VREF
N.C.
TP30
TP31
TP32
IVP2
IVP1
GND
40
41
42
43
44
1
2
3
4
5
6
28
27
26
25
24
23
22
21
20
19
18
CINP
CIPP
CONP
COPP
N.C.
TP11
TP10
IIP2
IIN2
IIP1
IIN1
7
8
9
10
11 12
13 14
15 16
17
COP2
CON2
CON1
COP1
CIP1
N.C.
DR-00941
Package: PLCC-44
BLOCK DIAGRAM
12 CONNECTIONS
FOR LOOPCAPS
V D D VSS
IVP1
IVP2
ANALOG
INTEG.
SIGNAL
IIP1
IIN1
IIP2
IIN2
CIN1
CIP2
CIN2
TP4
TP5
POWER
TO
PULSERATE
FOUT1
FOUT2
DIR
&
PRO-
AVERAGE
CESSING
GND
VREF
REF
TIMING & CONTROL
OSC
OSC1
OSC2
DR-00942
2/12
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SA9108F
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
-40
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 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 -10°C to +70°C
#
, unless otherwise specified.)
Parameter
Supply Voltage
Supply Current
Nonlinearity of
Power Calculation
Symbol
V
DD
-V
SS
I
DD
Min Typ
4.5
Max Unit Condition
5.5
V
10 mA
+0.3
%
1% -100% of rated
power
Peak value
Peak value
I
OL
= 5mA
I
OH
= -2mA
Specified linearity
Min and max limits
-0.3
Current Sensor Inputs (Differential)
Input Current Range
I
II
-25
-25
+25
+25
V
SS
+1
µA
µA
V
V
Hz
Hz
Voltage Sensor Inputs (Asymmetric)
Input Current Range
I
IV
Digital Outputs:
Output Low Voltage
V
OL
Output High Voltage
V
OH
Pulse Rate: FOUT1, FOUT2 f
p
Oscillator
Pin VREF
Ref. Current
Ref. Voltage
#
V
DD
-1
0
64
0
180
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.
sames
3/12
SA9108F
PIN DESCRIPTION
Pin
Pin
PLCC-44 DIP-40
6
35
42
28
29
16
5
34
4
33
18
6
19
7
20
8
21
9
32
19
33
20
35
21
37
23
39
25
9
38
10
39
8
37
7
36
26
13
25
12
13
1
11
40
15
3
14
2
28
15
27
14
43
29
41
27
16
4
17
5
22
10
23
11
30
17
31
18
36
22
38
24
40
26
1
30
2
31
3
32
4/12
Designation
GND
V
DD
V
SS
IVP1
IVP2
IIN1
IIP1
IIN2
IIP2
OSC1
OSC2
FOUT1
FOUT2
DIR
CON1
COP1
CON2
COP2
CONP
COPP
CIN1
CIP1
CIN2
CIP2
CINP
CIPP
VREF
TP27
TP4
TP5
TP10
TP11
TP17
TP18
TP22
TP24
TP26
TP30
TP31
TP32
Description
Ground
Positive Supply Voltage
Negative Suply Voltage
Analog input for Voltage : Phase 1
Analog input for Voltage : Phase 2
Inputs for current sensor : Phase 1
Inputs for current sensor : Phase 2
Connections for crystal or ceramic resonator
(OSC1 = Input; OSC2 = Output)
Pulse rate outputs
Direction indication
Connections for outer loop capacitors of A/D
converters
Connections for inner loop capacitors of A/D
converters
Connection for current setting resistor
Test Pin. Connect to V
SS
Manufacturer's test pins (Leave unconnected)
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SA9108F
PIN DESCRIPTION (Continued)
Pin
Pin
Designation
PLCC-44 DIP-40
12
NC
24
NC
34
NC
44
NC
Description
Not connected
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 14µA
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 16µA
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.
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嵌入式系统
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