Page 1
sames
OSC1
DR-0108 8
7
OSC2
IIP
VRE F
TEST
DD
V
IIN
26543
1
FOUT1
8
IVP
TP12
GND
SS
TP11
FOUT2
13V910111214
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 Total power consumption rating below
25mW
n Adaptable to different types of current
sensors
n Operates over a wide temperature range
n Precision voltage reference on-chip
n Different pulse rate options available
DESCRIPTION
PIN CONNECTIONS
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,
the frequency of which is proportional to the
power consumption. The SA9602E performs
the calculation for active power.
The method of calculation takes the power
factor into account.
Energy consumption can be determined by
the power measurement being integrated over
time.
This innovative universal single phase power/
energy metering integrated circuit is ideally
suited for energy calculations in applications
such as residential municipal metering and
factory energy metering and control.
The SA9602E integrated circuit is available in
both 14 and 20 pin dual-in-line plastic (DIP-14/
Package: DIP-14
DIP-20), as well as 20 pin small outline (SOIC-
20) package types.
4448 PDS039-SA9602E-001 REV. D 17-06-97
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SA9602E
PIN CONNECTIONS
BLOCK DIAGRAM
IIP
IIN
IIN
IIP
VREF
TP4
TP5
TP6
TEST
V
DD
TP9
OSC2
ANALOG
1
2
3
4
5
6
7
8
9
10
DR-01095
Package: DIP-20
SOIC-20
POWER
INTEG-
20
19
18
17
16
15
14
13
12
11
GND
IVP
TP18
TP17
TP16
TP15
V
SS
FOUT2
FOUT1
OSC1
V
DD
POWER
V
SS
FOUT1
FOUT2
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IVP
GND
DR-01089
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SIGNA L
PROCE-
SSING
RATOR
VOLTAGE
VREF OSC1
REF.
OSC
TO
FREQUENCY
TIMING
OSC2
Page 3
SA9602E
ABSOLUTE MAXIMUM RATINGS*
Parameter Symbol Min Max Unit
Supply Voltage VDD -V
Current on any pin I
Storage Temperature T
Operating Temperature T
PIN
STG
O
SS
-0.3 6.0 V
-150 +150 mA
-40 +125 °C
-40 +85 °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
T
-25 +85 °C
O
Supply Voltage: Positive V
Supply Voltage: Negative V
Supply Current: Positive I
Supply Current: Negative I
DD
SS
DD
SS
Current Sensor Inputs (Differential)
Input Current Range I
II
Voltage Sensor Input (Asymmetrical)
Input Current Range I
IV
Pins FOUT1, FOUT2
Output Low Voltage V
Output High Voltage V
Pulse Rate FOUT1 f
FOUT2
1
OL
OH
P
f
P2
sames
2.25 2.75 V
-2.75 -2.25 V
56mA
56mA
-25 +25 µA Peak value
-25 +25 µA Peak value
VSS+1 V IOL = 5mA
VDD-1 V IOH = -2mA
10 1160 Hz Specified linearity
0.5 3000 Hz Min and max limits
fP/290
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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
Ref. Voltage V
R
R
45 50 55 µA connected to V
1.1 1.3 V Referred to V
SS
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 20 Pin Designation Description
14 20 GND Ground
5 8 V
10 14 V
DD
SS
Positive Supply Voltage
Negative Supply Voltage
13 19 IVP Analog input for Voltage
1 1 IIN Inputs for current sensor
2 2 IIP
7 11 OSC1 Connections for crystal or ceramic resonator
6 10 OSC2 (OSC1 = Input ; OSC2 = Output)
8 12 FOUT1 First pulse rate output
9 13 FOUT2 Second pulse rate output
3 3 VREF Connection for current setting resistor
4 7 TEST Test Pin. Tie to VSS for protection in case of HV
transients
5 TP5 Test Pin (Leave unconnected)
6 TP6
9 TP9
11 TP11
12 TP12
15 TP15
16 TP16
17 TP17
18 TP18
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SS
Page 5
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 16mV
converted to a current of between 0 and 16µA
(0 to 80A through a shunt resistor of 200µΩ). This voltage is
RMS
, by means of resistors R1 and R2.
RMS
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 14µA
at nominal
RMS
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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Page 6
SA9602E
IIP
CURRENT
SEN SO R
IN P U TS
IIN
IVP
VOLTAGE
SEN SO R
IN P U T
V
DD
V
SS
V
DD
V
SS
V
DD
V
SS
A
I
A
V
D R - 0 10 90
GN D
3. Electrostatic Discharge (ESD) Protection
The SA9602E integrated circuit's inputs/outputs are protected against ESD .
4. Power Consumption
The power consumption rating of the SA9602E integrated circuit is less than 25mW.
5. Pulse Output Signals
The diagram below shows the behaviour of the instantaneous pulse output, FOUT1,
with respect to the power consumption.
v
MAI NS
t
POWER
V x I
t
FOUT
DR-01282
t
P
t
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Page 7
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 16µA
into the SA9602E at maximum
RMS
line current.
Values for RSH of less than 200µΩ should be avoided.
R1 = R2 = (IL/16µA
Where I
L
) * RSH/2
RMS
= 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
*
3.58MHz I
FOSC * II .I
*
V
2
R
Where FOUTX = Normal rated frequency (4Hz or 1160Hz)
.
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SA9602E
FOSC = Oscillator frequency (2MHz ...... 4MHz)
I
I
I
V
I
R
= Input current for current input (16µA
= Input current for voltage input (14µA
= Reference current (typically 50µA)
at rated)
RMS
at rated)
RMS
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.
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SA9602E
Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.
NC
6
4
5
IC-2
3
2
1
NC
R6
R8
R4
14
1
13
2
12
3
11
IC-1
4
10
5
9
C15
6
7
C10
C9
DR-01091
8
XTA L
R1
R7
ZD1
ZD2
R2
R9
C13
D1
RSH
R3
R5
C11
LOA D
C14
D2
R10
SU PPLY
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Page 10
SA9602E
Parts List for Application Circuit: Figure 1
Item Symbol Description Detail
1 IC-1 SA9602E DIP-14
2 IC-2 Optocoupler 4N35 DIP-6
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 Colour burst TV
8 R1 Resistor, 1% metal Note 1
9 R2 Resistor, 1% metal Note 1
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 Note 2
24 RSH Shunt Resistor 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.
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SA9602E
R
Figure 2: Application Circuit using a Current Transformer for Current Sensing.
DI
R6
FM
C11*
R4
8
13
14
9
12
10
11
0V
C9
C10
R3
IC-1
1
R1
RSH
5
7
2
6
3
4
XTAL
R7
R2
R2
R8
R9
=
R1
RSH = TE RM I NATI ON RES I STO R FO R CURRENT T RANSF O RM ER
5V
CT
2.4V T O 2.6V DC
DR-01092
L
LOAD
N
SUPPLY
sames
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SA9602E
Parts List for Application Circuit: Figure 2
Item Symbol Description Detail
1 IC-1 SA9602E DIP-14
2 XTAL Crystal, 3.5795MHz Colour burst TV
3 RSH Resistor Note 1
4 R1 Resistor, 1%, metal Note 2
5 R2 Resistor, 1%, metal Note 2
6 R3 Resistor, 390k, (230VAC), 1%, metal
7 R4 Resistor, 1M, 1/4W, 1%, metal
8 R6 Resistor, 24k, 1/4W, metal
9 R7 Resistor, 24k, 1/4W, 1%, metal
10 R8 Resistor, 2.2k, 1/4W, 1%, metal
11 R9 Resistor, 2.2k, 1/4W, 1%, metal
12 C9 Capacitor, 820nF Note 3
13 C10 Capacitor, 100nF
14 C11 Capacitor Note 4
15 CT Current transformer
Note 1: See TYPICAL APPLICATIONS when selecting the value of RSH.
Note 2: Resistor (R1and R2) values are dependant upon the selected value of RSH.
Note 3: Capacitor (C9) to be positioned as close to Supply Pins (VDD & VSS) of IC-1,
as possible.
Note 4: 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: When ordering, the Package Option should be specified along with the Part
Number.
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Page 13
Note:
SA9602E
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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: 012 333-6021 Tel: Int +27 12 333-6021
Fax: 012 333-8071 Fax: Int +27 12 333-8071
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