sames
SA9602E
SINGLE PHASE UNIDIRECTIONAL POWER/ENERGY
METERING IC WITH INSTANTANEOUS PULSE OUTPUT
FEATURES
n
Pin and functionally compatible with the
SA9102E with reduced external
components
n
Performs unidirectional power and
energy measurement
n
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
n
Protected against ESD
n
n
n
n
n
Total power consumption rating below
25mW
Adaptable to different types of current
sensors
Operates over a wide temperature range
Precision voltage reference on-chip
Different pulse rate options available
PIN CONNECTIONS
DESCRIPTION
The SAMES SA9602E is an enhancement of
the SA9102E, as no external capacitors are
required for the A/D converters.
The SAMES SA9602E Single Phase
unidirectional Power/Energy metering
integrated circuit generates a pulse rate output,
1
IIN
the frequency of which is proportional to the
power consumption. The SA9602E performs
2
IIP
the calculation for active power.
VR EF 3
The method of calculation takes the power
factor into account.
T E ST 4
Energy consumption can be determined by
5
V DD
the power measurement being integrated over
time.
OS C2 6
This innovative universal single phase power/
OS C1 7
energy metering integrated circuit is ideally
suited for energy calculations in applications
DR-0108 8
such as residential municipal metering and
factory energy metering and control.
The SA9602E integrated circuit is available in
Package: DIP-14
both 14 and 20 pin dual-in-line plastic (DIP-14/
DIP-20), as well as 20 pin small outline (SOIC20) package types.
1 4 GN D
13
IVP
12
T P 12
11
T P 11
10
V SS
9
FO UT 2
8
FO UT 1
1/14
4448
PDS039-SA9602E-001
REV. D
17-06-97
SA9602E
PIN CONNECTIONS
IIN
IIP
1
20 GN D
2
19 IVP
VREF
3
18 TP18
TP4
4
17 TP17
TP5
5
16 TP16
TP6
TEST
V DD
6
15
7
14
TP15
V SS
8
13
FOU T2
9
TP9
OSC 2 10
12
FOU T1
OSC 1
11
DR-01095
Package: DIP-20
SOIC-20
BLOCK DIAGRAM
V DD
IIP
FOUT1
POWER
IIN
A NALOG
INTEG-
POWER
RA TOR
TO
SIGNA L
FREQUENCY
PROCEVOLTA GE
REF.
SSING
IVP
GND
OSC
D R-0 1 08 9
2/14
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VREF
OSC1
V SS
TIMING
OSC2
FOUT2
SA9602E
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage
VDD -VSS
Current on any pin
IPIN
Storage Temperature
Operating Temperature
TSTG
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
Operating temperature
range #
TO
Supply Voltage: Positive
Typ
Max
Unit
Condition
-25
+85
°C
VDD
2.25
2.75
V
Supply Voltage: Negative
V SS
-2.75
-2.25
V
Supply Current: Positive
IDD
5
6
mA
Supply Current: Negative
I SS
5
6
mA
-25
+25
µA
Peak value
IIV
-25
+25
µA
Peak value
V OL
VOH
VSS+1
V DD-1
V
V
IOL = 5mA
IOH = -2mA
1160
3000
Hz
Hz
Specified linearity
Min and max limits
Current Sensor Inputs (Differential)
Input Current Range
III
Voltage Sensor Input (Asymmetrical)
Input Current Range
Pins FOUT1, FOUT2
Output Low Voltage
Output High Voltage
Pulse Rate FOUT1
FOUT21
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fP
fP2
10
0.5
fP/290
3/14
SA9602E
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
-I R
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
Note1:
#
Two additional bondout options of FOUT2 are available on request: fp/4 and
fp/16.
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
7
6
8
9
3
4
14
19
1
2
11
10
12
13
3
7
V SS
IVP
IIN
IIP
OSC1
OSC2
FOUT1
FOUT2
VREF
TEST
Negative Supply Voltage
Analog input for Voltage
Inputs for current sensor
5
6
9
15
16
TP5
TP6
TP9
TP11
TP12
TP15
TP16
17
18
TP17
TP18
11
12
4/14
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Connections for crystal or ceramic resonator
(OSC1 = Input ; OSC2 = Output)
First pulse rate output
Second pulse rate output
Connection for current setting resistor
Test Pin. Tie to VSS for protection in case of HV
transients
Test Pin (Leave unconnected)
SA9602E
FUNCTIONAL DESCRIPTION
The SA9602E 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 SA9602E in both DIP-20 and SOIC-20 package options is a direct replacement for
the SA9102E with the advantage of no external loop capacitors.
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 SA9602E generates pulses, the frequency of
which is proportional to the power consumption. Two frequency outputs (FOUT1 and
FOUT2) are available, with a third frequency option available on request. The pulse rate
follows the instataneous power consumption measured.
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 16µA RMS, 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 SA9602E power meter chip at FOUT1 (Pin 12) is 1.16kHz. In this
case 1 pulse will correspond to an energy consumption of 18.4kW/1160Hz =
15.9Ws.
The output frequency at FOUT2 is FOUT1 /290 (i.e. The frequency ouput at FOUT1
divided by 290).
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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SA9602E
VD D
IIP
C U R R EN T
S EN SO R
IN P U TS
VS S
AI
VD D
IIN
VS S
VD D
IV P
VOLTA G E
S EN SO R
IN P U T
VSS
AV
GN D
D R - 0 10 90
3.
4.
5.
Electrostatic Discharge (ESD) Protection
The SA9602E integrated circuit's inputs/outputs are protected against ESD .
Power Consumption
The power consumption rating of the SA9602E integrated circuit is less than 25mW.
Pulse Output Signals
The diagram below shows the behaviour of the instantaneous pulse output, FOUT1,
with respect to the power consumption.
v MAINS
t
POWER
Vx I
t
F OUT
t
DR-0 1 2 8 2
tP
6/14
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SA9602E
The output on pin FOUT is a pulse density signal representing the instantaneous power/
energy measurement. The minimum timing characteristics are shown in the following
diagram.
71us
71us min.
DR-01151
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 SA9602E 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 SA9602E 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 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:
FOSC
II .IV
f = 11.16 * FOUTX *
* 2
3.58MHz
IR
Where FOUTX
= Normal rated frequency (4Hz or 1160Hz)
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7/14
SA9602E
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 PPL Y
R SH
R5
C 11
D2
D1
R3
ZD 2
C 14
R 10
ZD 1
R7
R1
C 13
R9
R2
C9
X TA L
1
2
3
4
5
6
7
C 15
IC-1
R8
R4
D R -0 10 9 1
C 10
14
13
12
11
10
9
8
R6
2
NC 3
1
IC-2
6 NC
5
4
SA9602E
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
9/14
SA9602E
Parts List for Application Circuit: Figure 1
Item Symbol
Description
1
IC-1
SA9602E
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
C9
Capacitor, 100nF
19
C10
Capacitor, 100nF
20
C11
Capacitor, 0.47µF, 250VAC, polyester
21
C13
Capacitor, 100µF
22
C14
Capacitor, 100µF
23
C15
Capacitor, 820nF
24
RSH
Shunt Resistor
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
S UP P LY
N
L O AD
5V
DR-01092
2.4V T O 2. 6V DC
CT
C10
R7
RS H
X T AL
R1
1
2
3
4
5
6
7
C9
I C-1
14
13
12
11
10
9
8
R4
C11*
R6
RS H = T E RM I NATI O N RE S I S TO R F O R CURRE NT T RANS F O RM ER
R1 = R2
R9
R8
R2
R3
0V
FM
DIR
SA9602E
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
11/14
SA9602E
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
SA9602E
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
SA9602EPA
DIP-14
SA9602EPA
DIP-20
SA9602ESA
SOIC-20
Note:
12/14
When ordering, the Package Option should be specified along with the Part
Number.
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SA9602E
Note:
sames
13/14
SA9602E
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