sames
SA9602H
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
■
■
■
■
Total power consumption rating below
25mW
Adaptable to different types of current
sensors
Operates over a wide temperature range
Precision voltage reference on-chip
PIN CONNECTIONS
DESCRIPTION
The SAMES SA9602H is an enhancement of
the SA9102H, as no external capacitors are
required for the A/D converters. The SA9602H
has a higher output pulse rate than the
SA9102H.
IIN
1
The SAMES SA9602H Single Phase
IIP
2
bidirectional Power/Energy metering integrated
circuit generates a pulse rate output, the
VREF 3
frequency of which is proportional to the power
TEST 4
consumption. The SA9602H performs the
calculation for active power.
5
V DD
The method of calculation takes the power
OSC2 6
factor into account.
OSC1 7
Energy consumption can be determined by
the power measurement being integrated over
DR-01276
time.
This innovative universal single phase power/
energy metering integrated circuit is ideally
Package: DIP-14
suited for energy calculations in applications
such as residential municipal metering and
factory energy metering and control.
The SA9602H integrated circuit is available in
both 14 and 20 pin dual-in-line plastic (DIP-14/
DIP-20), as well as 20 pin small outline (SOIC20) package types.
14
GND
13
IVP
12
TP12
11
FMO
10
V SS
9
DIR
8
FOUT
1/14
7149
PDS039-SA9602H-001
REV.D
27-08-98
SA9602H
PIN CONNECTIONS
IIN
1
20
GND
IVP
IIP
2
19
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 -01277
Package: DIP-20
SOIC-20
BLOCK DIAGRAM
TE S T
V DD
TE S T2
IIP
V SS
FOU T
POWER
D IR
IIN
ANALOG
INTEG-
POWER
RATOR
TO
SIGNA L
FREQUENCY
PROCEVOLTAGE
REF.
SSING
IV P
FM O
GND
OSC
D R -0 1 2 7 8
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V RE F
OS C 1
TIMING
OS C 2
SA9602H
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage
VDD -VSS
Current on any pin
IPIN
Storage Temperature
TSTG
Operating Temperature
TO
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 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
VDD
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
VSS+1
V
V
IOL = 5mA
IOH = -2mA
1160
3000
Hz
Hz
µs
µs
Specified linearity
Min and max limits
Positive Energy Flow
Negative Energy Flow
Current Sensor Inputs (Differential)
Input Current Range
III
-25
Voltage Sensor Input (Asymmetrical)
Input Current Range
Pins FOUT, FOUT2
Output Low Voltage
Output High Voltage
IIV
-25
VOL
VOH
VDD-1
Pulse Rate FOUT
fP
Pulse Width tp
tPP
tpn
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0
0
71.55
143.1
3/14
SA9602H
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
VSS
IVP
IIN
IIP
VREF
TEST
Negative Supply Voltage
Analog input for Voltage
Inputs for current sensor
7
6
8
9
11
11
10
12
13
15
4
5
6
9
OSC1
OSC2
FOUT
DIR
FMO
TP4
TP5
TP6
TP9
TP12
TP16
TP17
TP18
12
16
17
18
4/14
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Connection for current setting resistor
Test Pin. Tie to VSS for protection against HV
transients and noise
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)
SA9602H
FUNCTIONAL DESCRIPTION
The SA9602H is a CMOS mixed signal Analog/Digital integrated circuit, which performs
power/energy calculations across a power range of 1000:1, to an overall accurancy of
better than Class 1.
The integrated circuit includes 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. The SA9602H generates pulses, the frequency of
which is proportional to the power consumption. The pulse rate follows the instataneous
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 14V. 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 SA9602H power meter chip at FOUT is 1.16kHz. In this case 1 pulse
will correspond to an energy consumption of 18.4kW/1160Hz = 15.9Ws.
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 AI 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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5/14
SA9602H
VD D
IIP
CURRE NT
S E NS O R
INP UT S
VSS
AI
VD D
IIN
VS S
VD D
IVP
V O L T AG E
S E NS O R
I NP UT
VSS
AV
G ND
DR-01279
3.
4.
5.
Electrostatic Discharge (ESD) Protection
The SA9602H integrated circuit's inputs/outputs are protected against ESD
Power Consumption
The power consumption rating of the SA9602H integrated circuit is less than 25mW.
Pulse Output Signals
The diagram below shows the behavior of the instantaneous pulse output, FOUT,
with respect to the power consumption.
v MA I N S
t
P OW E R
V x I
t
F OU T
t
D R-0 1 2 8 2
tP
6/14
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SA9602H
The diagram below shows the behavior of the direction indicator, 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 -01 2 84
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
SA9602H
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 SA9602H integrated circuit 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 SA9602H at maximum
line current.
Values for RSH of less than 200µΩ should be avoided.
R1 = R2 = (IL/16µA)RMS * 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 14µARMS.
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
I R2
= Normal rated frequency (1160Hz)
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
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LOAD
SUPPLY
R SH
sames
R5
C11
R3
D2
D1
ZD2
C14
R10
ZD1
R7
R1
C13
R9
R2
C9
XTAL
1
2
3
4
5
6
7
C15
I C -1
DR-01280
C10
14
13
12
11
10
9
8
R4
R8
R6
NC
LED
R11
2
3
1
I C -2
6 NC
5
4
SA9602H
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
9/14
SA9602H
Parts List for Application Circuit: Figure 1
Item Symbol
Description
1
IC-1
SA9602H
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
8
9
10
11
12
13
14
15
16
17
18
XTAL
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
Crystal, 3.5795MHz
Resistor, 1% metal
Resistor, 1% metal
Resistor, 390k, (230VAC) 1%, metal
Resistor, 1M, 1/4W, 1%, metal
Resistor, 470Ω, 2W, 5%, carbon
Resistor, 24k, 1/4W, 1%, metal
Resistor, 24k, 1/4W, 1%, metal
Resistor, 680Ω, 1/4W, 1%
Resistor, 680Ω, 1/4W, 1%
Resistor, 680Ω, 1/4W, 1%
Resistor, 2.2K, 1/4W, 1%
19
20
21
22
23
24
25
26
C9
C10
C11
C13
C14
C15
RSH
LED
Capacitor, 100nF
Capacitor, 100nF
Capacitor, 0.47µF, 250VAC, polyester
Capacitor, 100µF
Capacitor, 100µF
Capacitor, 820nF
Shunt Resistor
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
sames
L
SUPPL Y
N
L OA D
5V
D R -0 1 2 8 1
R9
R8
R2
C1 0
R7
RS H
9
8
6
7
C9
10
5
11
12
IC -1
3
4
14
13
1
2
XT AL
R1
R4
C1 1
R6
DIR
F OUT
FM O
R1 = R2
0V
R S H = T E R M I N A T I O N R E S I S T OR F O R C U R R E N T T R A N S F O R M E R
2 .4 V T O 2 .6 V DC
CT
R3
SA9602H
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
11/14
SA9602H
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
SA9602H
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
SA9602HPA
DIP-20
SA9602HSA
SOIC-20
SA9602HPA
DIP-14
Note:
12/14
When ordering, the Package Option must be specified along with the Part
Number.
sames
SA9602H
NOTES:
sames
13/14
SA9602H
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