sames
PRELIMINARY
SA9602F/SA9602J
SINGLE PHASE BIDIRECTIONAL POWER/ENERGY
METERING IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES
■
Performs bidirectional power and
energy measurement
■
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
■
Protected against ESD
DESCRIPTION
The SAMES SA9602F is an enhancement
of the SA9102F, as no external capacitors
are required for the A/D converters. The
SA9602J is an enhancement of the
SA9102H.
The SAMES SA9602F and SA9602J Single
Phase bidirectional Power/Energy metering
integrated circuits generate a pulse rate
output, the frequency of which is proportional
to the power consumption. Both devices
perform the active power calculation.
The method of calculation takes the power
factor into account.
Energy consumption is determined by the
power measurement being integrated over
time.
These innovative universal single phase
power/energy metering integrated circuits
are ideally suited for energy calculations in
applications such as residential municipal
metering and factory energy metering and
control.
The SA9602F and SA9602J integrated
circuits are available in both 14 and 20 pin
dual-in-line plastic (DIP-14/DIP-20), as well
■
■
■
■
Total power consumption rating below
25mW
Adaptable to different types of current
sensors
Operates over a wide temperature range
Precision voltage reference on-chip
as 20 pin small outline (SOIC-20) package
types.
Note that the 20 pin SA9602J is a direct
replacement for the SA9102H. The
SA9602H has a higher output pulse rate
than the SA9102H.
PIN CONNECTIONS
IIN
1
1 4 GND
IIP
2
13
IVP
VREF
3
12
TEST2
TEST
4
11
FMO
V DD
5
10
V SS
OSC2
6
9
DIR
OSC1
7
8
FOUT1
D R -0 1 2 7 6
Package: DIP-14
1/14
7132
PDS039-SA9602F-00A
REV.A
23-07-97
SA9602F/SA9602J
PIN CONNECTIONS
GND
IIN
1
20
IIP
2
19
IVP
VREF
3
18
TP17
TP4
4
17
TEST2
TP5
5
16
TP16
TP6
6
15
TEST
V DD
7
14
FMO
V SS
8
13
DIR
TP9
9
12
FOUT
OSC2
10
11
OSC1
D R -0 1 2 7 7
Package: DIP-20
SOIC-20
BLOCK DIAGRAM
TE S T
VDD
TE S T 2
I IP
V SS
FO U T
POWER
D IR
I IN
ANALOG
INTEG-
POWER
RATOR
TO
SIGNAL
FREQUENCY
PROCEVOLTAGE
REF.
SSING
IV P
FM O
GND
OSC
DR-01278
2/14
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VREF
OS C1
TIMING
OS C2
SA9602F/SA9602J
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage
VDD -VSS
Current on any pin
IPIN
Storage Temperature
T STG
Operating Temperature
TO
Min
-0.3
Max
6.0
-150
-40
-40
+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 condition 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
(VDD = 2.5V, VSS = -2.5V, over the temperature range -10°C to +70°C#, unless otherwise
specified.)
Parameter
Symbol Min
Typ
Max Unit Condition
Operating temperature
range #
TO
-25
+85
°C
Supply Voltage: Positive
V DD
2.25
2.75
V
Supply Voltage: Negative
VSS
-2.75
-2.25
V
Supply Current: Positive
IDD
5
6
mA
Supply Current: Negative
ISS
5
6
mA
+25
µA
Peak value
+25
µA
Peak value
V SS+1
V
V
IOL = 5mA
IOH = -2mA
64
180
Hz
Hz
ms
ms
Current Sensor Inputs (Differential)
Input Current Range
III
-25
Voltage Sensor Input (Asymmetrical)
Input Current Range
IIV
-25
Pins FOUT, DIR
Output Low Voltage
Output High Voltage
VOL
VOH
VDD-1
Pulse Rate FOUT
fP
Pulse Width tp
tPP
tpn
sames
0
0
1.1
3.4
Specified linearity
Min and max limits
Positive energy flow
Negative energy flow
3/14
SA9602F/SA9602J
ELECTRICAL CHARACTERISTICS (Continued)
(VDD = 2.5V, VSS = -2.5V, over the temperature range -10°C to +70°C #, unless otherwise
specified.)
Parameter
Symbol Min
Typ
Max Unit Condition
Pin VREF
With R = 24kΩ
Ref. Current
-IR
45
50
55
µA
connected to VSS
Ref. Voltage
VR
1.1
1.3
V
Referred to VSS
Oscillator
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
#
Extended Operating Temperature Range available on request.
PIN DESCRIPTION
14 Pin
14
5
20 Pin
20
8
Designation
GND
VDD
Description
Ground
Positive Supply Voltage
10
13
1
2
3
4
14
19
1
2
3
7
V SS
IVP
IIN
IIP
VREF
TEST
Negative Supply Voltage
Analog input for Voltage
Inputs for current sensor
12
7
6
8
9
11
18
11
10
12
13
15
4
5
6
9
16
17
TEST2
OSC1
OSC2
FOUT
DIR
FMO
TP4
TP5
TP6
TP9
TP16
TP17
4/14
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Connection for current setting resistor
Test Pin. Tied to VSS for protection against HV
transients and noise
Test Pin. May be left unconnected or tie to Vss
Connections for crystal or ceramic resonator
(OSC1 = Input ; OSC2 = Output)
Pulse rate output
Direction indication output
Rising edge of mains frequency
Test Pins (Leave unconnected)
SA9602F/SA9602J
FUNCTIONAL DESCRIPTION
The SA9602F and SA9602J are CMOS mixed signal Analog/Digital integrated circuits,
which perform power/energy calculations across a power range of 1000:1, to an overall
accurancy of better than Class 1.
The integrated circuits include all the required functions for 1-phase power and energy
measurement such as two 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. These devices generate pulses, the frequency of
which is proportional to the power consumption. The pulse rate follows the instantaneous
power consumption measured. Direction information is also provided.
A voltage zero crossover signal, relevant to the positive going half cycle, is available on
pin FMO. This signal can be used to sychronise circuit breaker switching.
1.
Power Calculation
In the Application Circuit (Figure 1), the voltage drop across the shunt will be between
0 and 16mVRMS (0 to 80A through a shunt resistor of 200µΩ). This voltage is
converted to a current of between 0 and 16µARMS, by means of resistors R1 and R2.
The current sense input saturates at an input current of ±25µA peak.
For the voltage sensor input, the mains voltage (230VAC) is divided down through
a divider to 14VRMS . The current into the A/D converter input is set at 14µARMS at
nominal mains voltage, via resistor R4 (1MΩ).
In this configuration, with a mains voltage of 230V and a current of 80A, the output
frequency of the SA9602F and SA9602J power meter chip at FOUT is 64Hz. In this
case 1 pulse will correspond to an energy consumption of 18.4kW/64Hz = 287.5Ws.
2.
Analog Input Configuration
The input circuitry of the current and voltage sensor inputs are illustrated below.
These inputs are protected against electrostatic discharge through clamping diodes.
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 signal processing circuitry.
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SA9602F/SA9602J
V DD
IIP
CU RR E NT
S E N S OR
IN P U TS
VSS
AI
V DD
IIN
V SS
V DD
IV P
V O LTA GE
S E N S OR
IN P U T
V SS
D R -009 08
3.
4.
5.
A
V
GN D
Electrostatic Discharge (ESD) Protection
The SA9602F and SA9602J integrated circuit's inputs/outputs are protected against
ESD
Power Consumption
The power consumption rating of the SA9602F and SA9602J integrated circuits is
less than 25mW.
Pulse Output Signals
The calculated power is divided down to a pulse rate of 64Hz, for rated conditions on
FOUT for both the SA9602F and SA9602J.
The format on the pulse output signal, which provides power/energy and direction
information, is the only difference between the SA9602F and SA9602J devices.
The direction of the energy flow is defined by the mark/space ratio in the SA9602F,
while the pulse width defines the direction on the SA9602J.
Waveform on FOUT
Posit iv e Energ y F low
N egativ e En erg y Flo w
SA9602F
SA9602J
tpp
t p p = 1 . 1m s
Waveform on DIR
D R -0 09 0 9
6/14
sames
tpp
tpn
t p n = 3 . 4m s
tpn
SA9602F/SA9602J
The diagram below shows the behavior of the direction indication, DIR, when energy
reversal takes place. The timing period for the DIR signal to change state, tDIR, will
be defined by the time it takes for the integrater to count down from its value at the
time of energy reversal. This is determined by the energy consumption rate.
I
t
V
t
D IR
t
D R - 01 283
t D IR
The square wave signal on FMO indicates the polarity of the mains voltage.
V
t
FM O
t
t M A IN S
D R -0 1 2 8 4
Due to comparator offsets, the FMO low to high transition can occur within a range
as shown above. The time between succesive low to high transitions will be equal
to the mains voltage period.
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7/14
SA9602F/SA9602J
TYPICAL APPLICATIONS
In the Application Circuits (Figures 1 and 2), the components required for power metering
applications, are shown.
In Figure 1, a shunt resistor is used for current sensing. In this application, the circuitry
requires a +2.5V, 0V, -2.5V DC supply.
In the case of Figure 2, when using a current transformer for current sensing, a +5V, 0V
DC supply is sufficient.
The most important external components for the SA9602F and SA9602J integrated
circuits are:
R2, R1 and RSH are the resistors defining the current level into the current sense input. The
values should be selected for an input current of 16µARMS into the SA9602F and SA9602J,
at maximum line current.
Values for RSH of less than 200µΩ should be avoided.
R1 = R2 = (IL/16µARMS )* RSH/2
Where IL
= Line current
RSH
= Shunt resistor/termination resistor
R3, R6 and R4 set the current for the voltage sense input. The values should be selected
so that the input current into the voltage sense input (virtual ground) is set to 14µA RMS.
R7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum conditions
are set. R7 may be varied within ±10% for calibration purposes. Any change to R7 will affect
the output quadratically (i.e.: R7 = +5%, fP = +10%).
The formula for calculating the output frequency is given below:
f = 11.16 * FOUTX *
Where FOUTX
FOSC
3.58MHz
*
II .IV
IR2
= Normal rated frequency (64Hz)
FOSC
= Oscillator frequency (2MHz ...... 4MHz)
II
= Input current for current input (16µARMS at rated)
IV
= Input current for voltage input (14µARMS 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.
8/14
sames
LOA D
sames
SU PPLY
R SH
R5
C11
R3
D2
D1
ZD 2
C14
R10
ZD 1
R7
R1
C13
R9
R2
C9
XTA L
1
2
3
4
5
6
7
C15
IC-1
D R -01 2 80
C10
14
13
12
11
10
9
8
R4
R8
R6
NC
LED
R11
1
2
3
IC-2
6 NC
5
4
SA9602F/SA9602J
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
9/14
SA9602F/SA9602J
Parts List for Application Circuit: Figure 1
Item Symbol
Description
1
IC-1
SA9602F or SA9602J
2
IC-2
Optocoupler 4N35
3
D1
Diode, Silicon, 1N4148
4
D2
Diode, Silicon, 1N4148
5
ZD1
Diode, Zener, 2.4V, 200mW
6
ZD2
Diode, Zener, 2.4V, 200mW
7
XTAL
Crystal, 3.5795MHz
8
R1
Resistor, 1% metal
9
R2
Resistor, 1% metal
10
R3
Resistor, 390k, (230VAC) 1%, metal
11
R4
Resistor, 1M, 1/4W, 1%, metal
12
R5
Resistor, 470Ω, 2W, 5%, carbon
13
R6
Resistor, 24k, 1/4W, 1%, metal
14
R7
Resistor, 24k, 1/4W, 1%, metal
15
R8
Resistor, 680Ω, 1/4W, 1%
16
R9
Resistor, 680Ω, 1/4W, 1%
17
R10
Resistor, 680Ω, 1/4W, 1%
18
R11
Resistor, 2.2K, 1/4W, 1%
19
C9
Capacitor, 100nF
20
C10
Capacitor, 100nF
21
C11
Capacitor, 0.47µF, 250VAC, polyester
22
C13
Capacitor, 100µF
23
C14
Capacitor, 100µF
24
C15
Capacitor, 820nF
25
RSH
Shunt Resistor
26
LED
Light Emitting Diode
Detail
DIP-14
DIP-6
Colour burst TV
Note 1
Note 1
Note 2
Note 3
Note 1: Resistor (R1 and R2) values are dependant upon the selected value of RSH.
Note 2: Capacitor (C15) to be positioned as close to Supply Pins (VDD & VSS) of IC-1 as
possible.
Note 3: See TYPICAL APPLICATIONS when selecting the value of RSH.
10/14
sames
N
L
SUPPLY
LOAD
sames
5V
DR-01281
2.4V TO2.6V DC
CT
C10
R7
RSH
XTAL
R1
5
6
7
4
1
2
3
C9
IC-1
11
10
9
8
14
13
12
RSH = TERMINATION RESISTOR FOR CURRENTTRANSFORMER
R1 = R2
R9
R8
R2
R3
R4
C11
R6
0V
DIR
FOUT
FM0
SA9602F/SA9602J
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
11/14
SA9602F/SA9602J
Parts List for Application Circuit: Figure 2
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Note 1:
Note 2:
Note 3:
Note 4:
Symbol
IC-1
XTAL
RSH
R1
R2
R3
R4
R6
R7
R8
R9
C9
C10
C11
CT
Description
SA9602F and SA9602J
Crystal, 3.5795MHz
Resistor
Resistor, 1%, metal
Resistor, 1%, metal
Resistor, 390k, (230VAC), 1%, metal
Resistor, 1M, 1/4W, 1%, metal
Resistor, 24k, 1/4W, metal
Resistor, 24k, 1/4W, 1%, metal
Resistor, 2.2k, 1/4W, 1%, metal
Resistor, 2.2k, 1/4W, 1%, metal
Capacitor, 820nF
Capacitor, 100nF
Capacitor
Current transformer
Detail
DIP-14
Colour burst TV
Note 1
Note 2
Note 2
Note 3
Note 4
See TYPICAL APPLICATIONS when selecting the value of RSH.
Resistor (R1and R2) values are dependant upon the selected value of RSH.
Capacitor (C9) to be positioned as close to Supply Pins (VDD & VSS ) of IC-1,
as possible.
Capacitor (C11) selected to minimize phase error introduced by current
transformer (typically 1.5µF).
ORDERING INFORMATION
Part Number
Package
SA9602FPA
DIP-14
SA9602FPA
DIP-20
SA9602FSA
SOIC-20
SA9602JPA
DIP-14
SA9602JPA
DIP-20
SA9602JSA
SOIC-20
Note:
12/14
When ordering, the Package Option must be specified along with the Part
Number.
sames
SA9602F/SA9602J
Notes:
sames
13/14
SA9602F/SA9602J
Disclaimer:
The information contained in this document is confidential and proprietary to South African
Micro-Electronic 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, 0039
Koedoespoort Industrial Area,
Republic of South Africa,
Pretoria,
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