SA9604/5 APPLICATION NOTE
sames
PM9604/5AP
THREE PHASE POWER/ENERGY METERING MODULE
FOR SPI BUS AND PULSE OUTPUT DEVICES
FEATURES
■
Module used for both SA9604A and
SA9605A evaluation
■
Uses current transformers for current
sensing
■
Meets the accuracy requirements for
Class 1 AC Watt hour meters
■
Protection against ESD
■
■
Operates over a wide temperature
range
Unused connection pads allows the
module to be customised
DESCRIPTION
This innovative power/energy module allows evaluation of both the SA9604A and
SA9605A, members of the SAMES three phase metering I.C. family.
It is advised that the relevant data sheet for the device under evaluation be read in
conjunction with this Application Note.
The output of this innovative universal three phase power/energy metering circuit is
ideally suited for energy calculations in applications using a µ-controller (SA9604A and
SA9605A) or mechanical counter (SA9605A).
On the left hand side of the board, next to the 25-way D-type connector, the array of
unused solder pads allow the user to customise the module. This section of the board
may be used to access the opto-coupler isolated output signals. Such components as
counters and LEDs may be added to this area to allow the user evaluation of a design
using the SA9604A or SA9605A.
CARE MUST BE TAKEN WHEN CONNECTING ADDITIONAL COMPONENTS TO
THE BOARD AS DANGEROUS VOLTAGE LEVELS EXIST IN SOME AREAS.
BLOCK DIAGRAM
SK3
J4
LINE 1
LINE 2
LINE 3
NEUTRAL
S IGN A L
C O N D IT IO N IN G
+ 2.5V
FOUT 1
O
P
T
O
0
FOUT 2
C
O
U
P
L
E
R
- 2.5V
S A 9 6 0 4 /5 A
PHASE 1
PHASE 2
PHASE 3
FOUT X (SA9605A)
DIR
SK2
O
P
T
O
(SA 9604A)
C
O
U
P
L
E
R
25-WAY D-TYPE - FEMALE
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7205
PDS038-SA9604/5-001
REV.B
18-06-98
PM9604/5AP
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage (Note 1)
VAC
Storage Temperature
TSTG
Operating Temperature (Note2)
TO
Note 1:
Note 2:
Min
-25
-10
Max
540
+125
+70
Unit
V
°C
°C
Voltages are specified with reference to Neutral.
The SA9604A and SA9605A integrated circuits are specified to operate over
the temperature range -10°C to +70°C. The module functionality will,
however, depend upon the external components used.
*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 operational 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. Power consumption
figures are applicable to the PM9604/5APE only.)
Parameter
Symbol Min
Typ Max
Unit Condition
Supply voltage (3 phase)
VAC
180
230
265
V
PM9604/5APE
(Continuous)
90
115
138
V
PM9604/5APA
Output
Refer to applicable IC data sheet
1
Power consumption
2.4
W
VDD = 5V
Note 1: Power consumption specifications exclude power consumed by the current
sensor.
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PM9604/5AP
CONNECTION DESCRIPTION
Designation
MAINS
SK2
25-Way female
(D-type)
SK3
4-Way male
Description
Voltage supply connection to Phase 1
Voltage supply connection to Phase 2
Voltage supply connection to Phase 3
Voltage supply connection to Neutral Live (common)
P1 Supply (+ve) to opto-couplers
P7 Input SA9604A - SCK
P8 Input SA9604A - DI
P9 Input SA9604A - CS
P12 Output SA9604A - DO
P18, 20 - 25 Common emitters and cathodes of opto-couplers
1. Supply (+ve) to opto-couplers
2. Output SA9605A - FOUT1 / FOUT2 (selectable)
3. Output SA9605A - DIR
4. Common emitters and cathodes of opto-couplers
SELECTION PINS
Jumper
JP1
JP2
JP3
JP4
JP5
JP6
JP7
Description
CT1 selection
CT2 selection
CT3 selection
SA9604A - SCK signal connection
SA9605A - FOUT1 on FOUT2 selection
SA9604A - DI signal connection
SA9605A - PGM1 level selection
SA9604A - CS signal connection
SA9605A - PGM0 level selection
Resistor selection for on-chip bias and reference current
sames
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PM9604/5AP
FUNCTIONAL DESCRIPTION
1. Power Calculation
In the Application Circuit (Figure 2), the output current from the current sensor will be
between 0 and 16µARMS. The current input stage saturates at input currents greater
than18µARMS. The mains voltage (mains voltage + 15% -20%) is used for the power
calculation, together with the current information from the current sensor (current
transformers).
For rated conditions, the signals into the current and voltage sensor inputs are set
as follows:
Current sensor input currents: 16µARMS
Voltage sensor input currents: 14µARMS
2.
Electrostatic Discharge (ESD) Protection
The device's inputs/outputs are protected against ESD. The modules resistance to
transients will be dependant upon the protection components used.
3.
Power Consumption
The overall power consumption rating for this power metering application (Figure
2), is under 2.4W, excluding the current sensors.
4.
Isolation
The reference for the unit is connected to neutral.
5.
Isolated Input/Output Interface
The isolated interface is provided to allow the user to access the registers of the
SA9604A and the output signals of the SA9605A.
Two connector types are available on the PM9604/5AP module to access the
outputs of the two devices:
SK2 - a 25-way D-type connector (female) for the SA9604A
SK3 - a 4-pin connector for the SA9605A.
Only one of the output interfaces must be used at any one time to avoid conflict of
signal levels on the opto-couplers.
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PM9604/5AP
6.
Jumper Configurations
The jumper configufations required for the two devices types are shown below:
JUMPER POSITION
JP1 1 - 2
SA9604A
Insert
SA9605A
Insert
NOTES
Note 1
JP2
JP3
1-2
1-2
Insert
Insert
Insert
Insert
JP4
1-2
2-3
Remove
Remove
Insert (FOUT1)
Insert (FOUT2)
Note 2
JP5
3-4
1-2
Insert (SCK)
Remove
Remove
Insert (PGM1=1)
Note 3
JP6
2-3
1-2
Insert (CS)
Remove
Remove (PGM1=0)
Insert (PGM0=1)
Note 3
JP7
2-3
1-2
Insert (DI)
Remove
Remove (PGM0=0)
Insert
Note 1:
Note 2:
Note 3:
The removal of the link on the current sensor input must only be
performed during calibration.
Only one of the two output pulse signals on the SA9605A may be
selected at any one time using this module. In a users application both
of these signals may be used.
The SA9605A I.C. has on-board pull-down resistors, pull-up connection
to VDD is, therefore, the only connection which must be catered for.
sames
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PM9604/5AP
7.
Circuit Description
The module is supplied from an on-board DC supply derived from the incoming
three phases.
The Application Circuit (Figure 2) details the components required for a three phase
power metering module. Terminated current transformers are used as current
sensors.
The most important external components are:
Terminated current sensors (current transformers) are connected to the current
sensor inputs of the devices through current setting resistors (R8...R13).
The resistor values should be selected for an input current of 16µARMS into the
integrated circuit current sensor inputs at the rated line current.
The values of these resistors are calculated as follows:
Phase 1:
R8 = R9 = (IL1/16µARMS) x R17/2
Phase 2:
R10 = R11= (IL2/16µARMS) x R18/2
Phase 3:
R12 = R13 = (IL3/16µARMS) x R19/2
Where
ILX
=
Secondary CT current at rated conditions.
R17, R18 and R19
=
Termination resistors of the three current
transformers.
R1A, R1B, R4 and R14 set the current for the phase 1 voltage sense input. R2A + R2B,R5
and R15 set the current Phase 2 and R3A + R3B, R6 and R16 set the current for Phase
3. The values should be selected so that the input current into the voltage sense
input (virtual ground) is set to 14µARMS at nominal line voltage. Capacitors C1, C2
and C3 are for decoupling and phase compensation.
Resistors R7A + R7B and trimpot T7 defines all on-chip bias currents. R7 is made up
of two resistors which can be connected in parallel using JP7 to allow convertion of
the module between the SA9604A and SA9605A devices.
The SA9604A uses a reference current of 25µA ± 10% and the SA9605A reference
current is 50µA ± 10%. Inserting the jumper will connect R7A and R7B in parallel,
thereby doubling the reference current to an appropriate level. T7 may be varied for
calibration purposes.
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.
6/14
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PM9604/5AP
8.
Demonstration Software
Software to demonstrate the capabilities of the SA9604A is provided with the
module. This software is supplied on a 3½" disk and will operate under Windows
95 or Windows 3.1 environment.
Figure 1: Module layout
PH2
PH3
PH1
CT2
JP2
R18
SK2
P I N 1R3 1 9
C3
R35
R34
R33
R11
R10
R16
R13
R12
J P 4 SA9 60 4
P IN 8
P I N 7FSeOUleTc t
P IN 1 2
IC 5
P14
IC 2
R28
P IN 9
SK3
R29
IC 1
R27
R22
R3A
R1A
R1B
R 7 BC 1
R4
C10
T7
R 2 6 GA ad ijn
R25
R32
R31
R30
M3
R2A
R2B
C2
JP6 JP5
M2
M1
R3B
JP1
R15
R8
R9
R14
C 1 1R 7 A
JP7
XTAL
JP3
R21
CT1
T5 T6 P H3
B a la n c e
PH2
R6
B al
R5
R17
CT3
R20
CT
CT
CT
M A IN S
IC 4
R24
C6
C9
IC 3
R23
C5
C4
D6 D5
D4 D3
C8
C7
D2 D1
SAM ES
P M 9 60 4/5A P
Note:
The pins of the voltage supply connector, called 'MAINS' have been incorrectly
marked. The order of the pins should read: N (Neutral), Ph 3, Ph 2, Ph 1.
The printed circuit board markings of the Ph 1 and Ph 3 pins have been swopped.
sames
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PM9604/5AP
Figure 2: Application Schematic
d r -0 1 3 2 0
8/14
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PM9604/5AP
d r-0 1 3 2 1
sames
9/14
PM9604/5AP
Parts List for Application Circuit: Figure 2
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
27
28
29
30
31
32
33
34
35
36
37
38
39
40
10/14
Symbol
IC-1
XTAL
R1A
R1B
R2A
R2B
R3A
R3B
R4
R5
R6
R7A
R7B
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
T5
T6
T7
C1
C2
C3
R20
R21
R22
R23
R24
R25
R26
R27
Description
SA9604AP / SA9605AP
Crystal, 3.5795 MHz
Resistor, 1%, ¼W, Metal
Resistor, 1%, ¼W, Metal
Resistor, 1%, ¼W, Metal
Resistor, 1%, ¼W, Metal
Resistor, 1%, ¼W, Metal
Resistor, 1%, ¼W, Metal
Resistor, 24k, 1%, ¼W, Metal
Resistor, 22k, 1%, ¼W, Metal
Resistor, 22k, 1%, ¼W, Metal
Resistor, 44k, 1%, ¼W, Metal
Resistor, 44k, 1%, ¼W, Metal
Resistor, 2.7k, 1%, ¼W, Metal
Resistor, 2.7k, 1%, ¼W, Metal
Resistor, 2.7k, 1%, ¼W, Metal
Resistor, 2.7k, 1%, ¼W, Metal
Resistor, 2.7k, 1%, ¼W, Metal
Resistor, 2.7k, 1%, ¼W, Metal
Resistor, 1M, 1%, ¼W, Metal
Resistor, 1M, 1%, ¼W, Metal
Resistor, 1M, 1%, ¼W, Metal
Resistor, 2.7Ω, 1%, ¼W, Metal
Resistor, 2.7Ω, 1%, ¼W, Metal
Resistor, 2.7Ω, 1%, ¼W, Metal
Potentiometer, 4.7k
Potentiometer, 4.7k
Potentiometer, 10k
Capacitor, electrolytic, 1µF, 16V
Capacitor, electrolytic, 1µF, 16V
Capacitor, electrolytic, 1µF, 16V
Resistor, 470Ω, 2W
Resistor, 470Ω, 2W
Resistor, 470Ω, 2W
Resistor, 680Ω, 1% ¼W, Metal
Resistor, 680Ω, 1% ¼W, Metal
Resistor, 2.4k, 1% ¼W, Metal
Resistor, 2.4k, 1% ¼W, Metal
Resistor, 2.4k, 1% ¼W, Metal
sames
Detail
DIP-20
TV Crystal
Note 4
Note 4
Note 4
Note 4
Note 4
Note 4
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Multi turn. Note 5
Multi turn. Note 5
Multi turn. Note 5
Note 2
Note 2
Note 2
PM9604/5AP
Parts List for Application Circuit: Figure 2 (Continued)
Item
Symbol
41
42
43
44
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
R28
R29
R31
R32
R33
R34
R35
C4
C5
C6
C7
C8
C9
C10
C11
XTAL
D1
D2
D3
D4
D5
D6
Z1
IC3
IC4
IC2
IC5
Description
Resistor, 820R, 1% ¼W, Metal
Resistor, 820R, 1% ¼W, Metal
Resistor, 47k, 1% ¼W, Metal
Resistor, 47k, 1% ¼W, Metal
Resistor, 680R, 1% ¼W, Metal
Resistor, 680R, 1% ¼W, Metal
Resistor, 680R, 1% ¼W, Metal
Capacitor
Capacitor
Capacitor
Capacitor, 200µF, 35V
Capacitor, 200µF, 35V
Capacitor, Tantulum, 10µF
Capacitor, Tantulum, 10µF
Capacitor, Ceramic 820nF
Crystal, 3.5795MHz
Diode, 1N4002
Diode, 1N4002
Diode, 1N4002
Diode, 1N4002
Diode, 1N4002
Diode, 1N4002
Diode, Zener, 22V
TL 431C, Voltage Reference
TL 431C, Voltage Reference
Quad Opto Coupler, ILQ73
Opto Coupler, 4N35
Detail
Note 4
Note 4
Note 4
Note 3
TV Crystal
Note 1: Resistor (R 8, R9, R10, R11, R12 and R13) values are dependant upon the selected
values of the current transformer termination resistors R17, R18 and R19.
Note 2: Capacitor values may be selected to compensate for phase errors caused by the
current transformers
Note 3: Capacitor (C11) to be positioned as close to Supply Pins (VDD & VSS) of IC-1, as
possible.
Note 4: See the table below detailing the component values for the selected voltage
standard.
Note 5: Trimpots required for calibration.
sames
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PM9604/5AP
Item
Symbol
3
4
5
6
7
8
47
48
49
R1A
R1B
R2A
R2B
R3A
R3B
C4
C5
C6
Description
PM9604/5APE PM9604/5APA
230V
115V
200kΩ
120kΩ
180kΩ
82kΩ
200kΩ
120kΩ
180kΩ
82kΩ
200kΩ
120kΩ
180kΩ
82kΩ
470nF
1µF
470nF
1µF
470nF
1µF
ORDERING INFORMATION
Part Number
PM9604/5APA
PM9604/5APE
12/14
Description
3 X 115V, 3 X 80A Module
3 X 230V, 3 X 80A Module
sames
Detail
PM9604/5AP
NOTE:
sames
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PM9604/5AP
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 our 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:
14/14
012 333-6021
012 333-8071
sames
Tel:
Fax:
Int +27 12 333-6021
Int +27 12 333-8071