sames
SA9105A
THREE PHASE UNIDIRECTIONAL POWER/ENERGY
METERING IC WITH PULSE OUTPUT
FEATURES
n
n
Performs unidirectional one, two or
three phase power and energy
measurement
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
n
Operates over a wide temperature
Range
n
Uses current transformers for current
sensing
n
Excellent long term stability
n
Easily adaptable to different signal
levels
n
Precision voltage reference on-chip
n
Three pulse rate outputs available
n
Protected against ESD
PIN CONNECTIONS
DESCRIPTION
The SAMES SA9105A Three Phase
unidirectional Power/Energy metering
40
CIN1 1
CIP2 2
integrated circuit generates a pulse rate
39
38
CIN2 3
output, the frequency of which is proportional
CIP3
4
37
to the power consumption. The SA9105A
36
CIN3
5
performs the calculations of active power.
6
35
IIN1
The method of calculation takes the power
IIP1
7
34
factor into account.
8
33
IIN2
Energy consumption is determined by the
32
9
IIP2
31
IIN3 10
power measurement being integrated over
IIP3 11
30
time.
29
COPP 12
The output of this innovative universal three
28
CONP 13
phase power/energy metering integrated
CIPP 14
27
circuit, is ideally suited for applications such
26
CINP 15
as residential and industrial energy metering
25
V SS 16
and control.
TP17 17
24
TP18 18
The SA9105A integrated circuit is available
23
OSC1 19
22
in 40 pin dual-in-line plastic (DIP-40), as
21
OSC2
20
well as in 44 pin plastic leaded chip carrier
DR-00838
(PLCC-44) packages types.
Package: DIP-40
CIP1
COP1
CON1
CON2
COP2
GND
IVP1
IVP2
IVP3
COP3
CON3
VREF
V DD
TP27
TP26
TP25
TP24
FOUT3
FOUT2
FOUT1
1/12
4032
PDS039-SA9105A-001
Rev. C
15-08-1995
SA9105A
TP25
TP24
FOUT3
FOUT2
FOUT1
N.C.
OSC2
OSC1
TP18
TP17
V SS
PIN CONNECTIONS
39
TP26
TP27
V DD
VREF
N.C.
CON3
COP3
IVP3
IVP2
IVP1
GND
38 37 36
35
34
33 32
31 30
29
40
28
41
27
42
26
43
25
44
24
1
23
2
22
3
21
4
20
5
19
6
18
8
9
10
11 12
13 14
15 16
17
COP2
CON2
CON1
COP1
CIP1
N.C.
CIN1
CIP2
CIN2
CIP3
CIN3
7
CINP
CIPP
CONP
COPP
N.C.
IIP3
IIN3
IIP2
IIN2
IIP1
IIN1
DR-00840
Package: PLCC-44
BLOCK DIAGRAM
16 CONNECTIONS
FOR LOOPCAPS
V D D VSS
IVP1
IVP2
ANALOG
IVP3
POWER
INTEG.
SIGNAL
FOUT1
TO
FOUT2
&
IIP1
IIN1
PRO-
PULSE
AVERAGE
IIP2
IIN2
CESSING
FOUT3
RATE
IIP3
IIN3
GND
OSC1
VREF
REF
DR-00839
2/12
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TIMING & CONTROL
OSC
OSC2
SA9105A
ABSOLUTE MAXIMUM RATINGS *
Parameter
Symbol
Supply Voltage
VDD-VSS
Current on any Pin
IPIN
Storage Temperature
TSTG
Operating Temperature
TO
Min
-0.3
Max
6.0
Unit
V
-150
-40
-40
+150
+125
+85
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
(Over the temperature range -10°C to +70°C#, unless otherwise specified.)
Parameter
Supply Voltage
Supply Current
Nonlinearity of
Power Calculation
Symbol
VDD-VSS
IDD
Current Sensor Inputs (Differential)
Input Current Range
III
Voltage Sensor Inputs (Asymmetric)
Input Current Range
IIV
Pins FOUT1,FOUT2,FOUT3
Output Low Voltage
VOL
Output High Voltage
VOH
Pulse Rate:
Min Typ
4.5
Max Unit Condition
5.5
V
15
mA
-0.3
+0.3
%
1% - 100% of
rated power
-25
+25
µA
Peak value
-25
+25
µA
Peak value
V SS+1
V
V
IOL = 5mA
IOH = -2mA
1160
3000
Hz
Hz
VDD-1
FOUT1
fp
10
0.5
FOUT2
fp2
fp/4
FOUT3
fp3
fp/290
Specified linearity
Min and max limits
Oscillator
Recommended crystal:
TV colour burst crystal, f = 3.5795 MHz
Pin VREF
With R = 24 kΩ
Ref. Current
-IR
45
50
55
µA connected to VSS
Ref. Voltage
VR
1.1
1.3
V
Referred to VSS
#
Extended Operating Temperature Range available on request.
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3/12
SA9105A
PIN DESCRIPTION
Pin
PLCC
6
42
29
Pin
DIP
35
28
16
Designation
5
4
3
18
19
20
21
22
23
32
33
35
36
37
9
10
8
7
1
2
26
25
13
11
15
14
17
16
28
27
43
30
31
38
39
40
41
34
33
32
6
7
8
9
10
11
19
20
21
22
23
38
39
37
36
30
31
13
12
1
40
3
2
5
4
15
14
29
17
18
24
25
26
27
IVP1
IVP2
IVP3
IIN1
IIP1
IIN2
IIP2
IIN3
IIP3
OSC1
OSC2
FOUT1
FOUT2
FOUT3
CON1
COP1
CON2
COP2
CON3
COP3
CONP
COPP
CIN1
CIP1
CIN2
CIP2
CIN3
CIP3
CINP
CIPP
VREF
TP17
TP18
TP24
TP25
TP26
TP27
4/12
GND
VDD
VSS
sames
Description
Ground
Positive Supply Voltage
Negative Suply Voltage
Analog Input for Voltage :
Analog Input for Voltage :
Analog Input for Voltage :
Inputs for current sensor :
Phase 1
Phase 2
Phase 3
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
Connections for outer loop capacitors of A/D
converters
Connections for inner loop capacitors of A/D
converters
Connection for current setting resistor
Manufacturer's Test Pins (Leave unconnected)
SA9105A
PIN DESCRIPTION (Continued)
Pin
PLCC
12
24
34
44
Pin
DIP
Designation
NC
NC
NC
NC
Description
Not connected
FUNCTIONAL DESCRIPTION
The SAMES SA9105A 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 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 SA9105A generates pulses, the frequency of which is proportional to the power
consumption. Three frequency outputs (FOUT1, FOUT2 and FOUT3) are available.
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 IVP1, IVP2 and
IVP3.
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 R15, R16 and
R17.
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 R 12, 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 SA9105A 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 FOUT2 is FOUT1/4. At FOUT3 the output frequency is
FOUT1/290.
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5/12
SA9105A
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 AV generate virtual
shorts on the signal inputs. Exact duplications of the input currents are generated
for the analog processing circuitry
VD D
IIP
CURRENT
SENSOR
INPUTS
V SS
AI
V DD
IIN
V SS
V DD
IVP
VOLTAGE
SENSOR
INPUT
DR-00904
V SS
AV
GND
3.
Electrostatic Discharge (ESD) Protection
The SA9105A integrated circuit's inputs/outputs are protected against ESD according
to Mil-Std 883 method 3015. The SA9105A integrated circuit's resistance to
transients is also dependant upon the external protection components used.
4.
Power Consumption
The overall power consumption rating of the SA9105A integrated circuit is less than
75mW with a 5V supply.
6/12
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SA9105A
TYPICAL APPLICATION
In the Application Circuit (Figure 1), the components required for a three phase power
metering application are shown. Terminated current transformers are used for current
sensing.
The most important external components for the SA9105A integrated circuit are:
C7, C9, C10 and C11 are the outer loop capacitors for the integrated oversampling
A/D converters. The typical value of C7 is 2.2nF and the value of C9, C10 and C11 is
560pF.
The actual values determine the signal to noise and stability performance. The tolerances
should be within ± 10%.
C4, C5, C6 and C8 are the inner loop capacitors for the integrated oversampling A/D
converters. The typical value of C4, C5, C6 and C 8 is 3.3nF. Values smaller than 0.5nF
and larger than 5nF should be avoided.
Terminated current sensors (current transformers) are connected to the current sensor
inputs of the SA9105A through current setting resistors (R8 ..R13).
The resistor values should be selected for an input current of 16µA into the SA9105A at
the rated line current.
The values of these resistors should be calculated as follows:
Phase 1:
R8 = R9 = (I L1/16µA) * R18/2
Phase 2:
R10 = R11 = (IL2/16µA) * R19/2
Phase 3:
R12 = R13 = (IL3/16µA) * R20/2
Where ILX
= Secondary CT current at rated conditions.
R18, R19 and R20
= Current transformer termination resistors for the three phases.
R1 + R1A , R4 and R15 set the current for the phase 1 voltage sense input. R2 + R2A, R5 +
P5 and R16 set the current for phase 2 and R3 + R3A, R6 + P6 and R17 set the current for phase
3. The values should be selected so that the input current into the voltage sense inputs
(virtual ground) are set to 14µA for nominal line voltage. Capacitors C1, C2 and C3 are
for decoupling and phase compensation.
R14 + P 14 defines all on-chip bias and reference currents. With R14+ P14 = 24kΩ, optimum
conditions are set. R14 may be varied within ± 10% for calibration purposes. Any changes
to R14 will affect the output quadratically (i.e: ∆R = +5%, ∆f = +10%).
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7/12
SA9105A
The formula for calculating the Output Frequency (f) is given below:
FOSC
(II1 IV1) + (II2 I V2) + (II3 IV3)
f = 11.16 * FOUTX *
*
3.58MHz
3 * I R2
Where FOUTX
= Nominal rated frequency (4Hz, 290Hz or 1160Hz)
FOSC
= Oscillator frequency (2MHz ...... 4MHz)
II1, I I2, I I3
= Input currents for current inputs (16µA at rated)
IV1, IV2, IV3 = Input currents for voltage inputs (14µA at rated)
IR
= Reference current (typically 50µA)
XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator
frequency is divided down to 1.7897 MHz on-chip, to supply the digital circuitry and the
A/D converters.
8/12
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SA9105A
Figure 1: Application Circuit for Three Phase Power/Energy Measurement.
MAINS VOLTAGES
R1
R1A
R2
R2A
R3
R3A
LINE 1
LINE 2
LINE 3
C4
N
0V
C5
FROM CTs
R18
R8
R9
R19
R10
VI2P
R11
VI2N
40
39
3
38
4
37
5
36
5V
C9
R7
C10
C6
VI1P
VI1N
1
2
R20
R12
VI3P
R13
VI3N
2.5V
2.5V
C7
35
6
7
SA9105A
8
9
33
DIP-40
10
11
34
32
+ C1
R16
+ C2
R17
+ C3
IC-1
R5
R4
R21
C14
C11
30
12
29
13
28
14
27
15
26
16
25
17
24
5V
P6
P5
C13
0V
18
23
FOUT3
19
22
FOUT2
20
21
0V
0V
FOUT1
XTAL
DR-00233
2.5V
R6
31
C8
0V
R15
0V
C12
R14
P14
0V
sames
9/12
SA9105A
Parts List for Application Circuit: Figure 1
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
10/12
Symbol
IC-1
XTAL
R1
R1A
R2
R2A
R3
R3A
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
P5
P6
P14
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
Description
Integrated SA9105A
Crystal, 3.5795 MHz
Resistor, 200k, 1%, ¼W
Resistor, 180k, 1%, ¼W
Resistor, 200k, 1%, ¼W
Resistor, 200k, 1%, ¼W
Resistor, 200k, 1% , ¼W
Resistor, 180k, 1%, ¼W
Resistor, 24k, 1%, ¼W
Resistor, 22k, 1%, ¼W
Resistor, 22k, 1%, ¼W
Resistor, 820 Ω, 1%, ¼W
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor, 22k, 1%, ¼W
Resistor, 1M, 1%, ¼W
Resistor, 1M, 1%, ¼W
Resistor, 1M, 1%, ¼W
Resistor
Resistor
Resistor
Resistor, 820Ω, 1%, ¼W
Potentiometer, 4.7k
Potentiometer, 4.7k
Potentiometer, 4.7k
Capacitor, electrolytic, 1µF, 16V
Capacitor, electrolytic, 1µF, 16V
Capacitor, electrolytic, 1µF, 16V
Capacitor, 3.3nF
Capacitor, 3.3nF
Capacitor, 3.3nF
Capacitor, 2.2nF
Capacitor, 3.3nF
Capacitor, 560pF
Capacitor, 560pF
Capacitor, 560pF
sames
Detail
DIP-40/PLCC-44
Colour burst TV
Note
Note
Note
Note
Note
Note
1
1
1
1
1
1
Note 1
Note 1
Note 1
Multi
Multi
Multi
Note
Note
Note
turn
turn
turn
2
2
2
SA9105A
Parts List for Application Circuit: Figure 1 (Continued)
Item
41
42
43
Symbol
C12
C13
C14
Description
Capacitor, 820nF
Capacitor, 100nF
Capacitor, 100nF
Detail
Note 3
Note 1: Resistor (R8, R9, R10, R11, R12 and R13) values are dependant upon the selected
values of the current transformer termination resistors R18, R19 and R20.
Note 2: Capacitor values may be selected to compensate for phase errors caused by the
current transformers.
Note 3: Capacitor (C12) to be positioned as close to Supply Pins (VDD & VSS) of IC-1, as
possible.
ORDERING INFORMATION
Part Number
Package
SA9105APA
DIP-40
SA9105AFA
PLCC-44
sames
11/12
SA9105A
Disclaimer:
The information contained in this document is confidential and proprietary to South African MicroElectronic Systems (Pty) Ltd ("SAMES") and may not be copied or disclosed to a third party, in whole or in part,
without the express written consent of SAMES. The information contained herein is current as of the date of
publication; however, delivery of this document shall not under any circumstances create any implication that the
information contained herein is correct as of any time subsequent to such date. SAMES does not undertake to inform
any recipient of this document of any changes in the information contained herein, and SAMES expressly reserves
the right to make changes in such information, without notification,even if such changes would render information
contained herein inaccurate or incomplete. SAMES makes no representation or warranty that any circuit designed
by reference to the information contained herein, will function without errors and as intended by the designer.
Any Sales or technical questions may be posted to our e-mail address below:
[email protected]
For the latest updates on datasheets, please visit out web site:
http://www.sames.co.za
South African Micro-Electronic Systems (Pty) Ltd
P O Box 15888,
33 Eland Street,
Lynn East,
Koedoespoort Industrial Area,
0039
Pretoria,
Republic of South Africa,
Republic of South Africa
Tel:
Fax:
12/12
012 333-6021
012 333-8071
sames
Tel:
Fax:
Int +27 12 333-6021
Int +27 12 333-8071