sames
SA9602M
SINGLE PHASE POWER/ENERGY METERING IC WITH
SELECTABLE PULSE RATE FOR MECHANICAL DISPLAY
APPLICATIONS
FEATURES
n
Provides ease of interface to systems
employing a mechanical counter
n
Performs bidirectional power and
energy measurement
n
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
n
Protected against ESD
n
Allows selection of motor driver
configuration
DESCRIPTION
The SAMES SA9602M Single Phase
bidirectional Power/Energy metering integrated circuit generates a pulse rate output,
the frequency of which is proportional to
the power consumption. The SA9602M
performs the calculation for active power.
The method of calculation takes the power
factor into account.
Energy consumption can be determined by
counting output pulses. The pulse rate for
a particular application is selected according
to the status of inputs MP0 and MP1.
This innovative universal single phase
power/energy metering integrated circuit is
ideally suited for energy calculations in
applications utilizing a mechanical display.
The SA9602M integrated circuit is available
in 20 pin dual-in-line plastic (DIP-20), as
well as 20 pin small outline (SOIC-20)
package types.
n
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
Selectable pulse rate
Scaling of rated conditions provides
ease of implementation for meter
manufactured.
PIN CONNECTIONS
IIN
1
20 G N D
IIP
2
19
IV P
VRE F 3
18
D IR I
R1
4
17
D IR O
R0
5
16
MP W
MP 1
6
15
MP 0
VD D
7
14
MD
VS S
8
13
LE D
TE S T
9
12 MO TO R
11 O S C 1
O S C 2 10
D R -0 1 3 2 8
Package:
DIP-20
SOIC-20
1/16
7130
PDS039-SA9602M-001
REV. B
9-09-97
SA9602M
BLOCK DIAGRAM
VDD
VSS
TEST
MP0 MP1
R1
R0
IVN
ANALOG
GN D
DIGITAL
SIGNAL
PROG.
SIGNAL
IIN
IIP
PRO-
PRO-
CESSING
CESSING
MOTOR
MOTOR
DRIVER
LED
VREF
O S C I L L ATO R
D R -01333
OSC1
OSC2
DIRO
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage
VDD -VSS
Current on any pin
IPIN
Storage Temperature
TSTG
Operating Temperature
TO
MPW
DIRI
Min
-0.3
-150
-40
-25
MD
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.
2/16
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SA9602M
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 temp. 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
+25
µA
Peak value
+25
µA
Peak value
Current Sensor Inputs (Differential)
Input Current Range
III
Voltage Sensor Input (Asymmetrical)
Input Current Range
IIV
-25
Pin R0, R1,
Input High Voltage
VIH
VDD-1
Input Low Voltage
VIL
Pin MP0, MP1
Input High Voltage
Input Low Voltage
VIH
VIL
Pull down
V
VSS+1
V
Pull down
VDD-1
VSS+1
V
V
Pin MOTOR
Tri-state
Pin DIRO
Output High Voltage
Output Low Voltage
VOH
VOL
VDD-1
VOH
VOL
VDD-1
Pin DIRI
Input High Voltage
Input Low Voltage
VIH
VIL
VDD-1
Pin LED
Output High Voltage
Output Low Voltage
VDH
VOL
VDD-1
VSS+1
V
V
VSS+1
V
V
IOH = -2mA
IOL = 5mA
Pull up
sames
VSS+1
V
V
VSS+1
V
V
IOH = -2mA
IOL = 5mA
3/16
SA9602M
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 MD, MPW
Pull down
VIH
VDD-1
V
VIL
VSS+1 V
Pin VREF
Ref. Current
Ref. Voltage
Oscillator
#
-IR
VR
45
1.1
50
55
1.3
µA
V
With R = 24kΩ
connected to VSS
Referred to VSS
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
Extended Operating Temperature Range available on request.
PIN DESCRIPTION
4/16
Pin
20
8
Designation
GND
VDD
Description
Ground
Positive Supply Voltage
14
19
1
2
3
11
10
12
13
4
5
6
7
18
17
16
15
9
VSS
IVP
IIN
IIP
VREF
OSC1
OSC2
MOTOR
LED
R1
R0
MP1
MP0
DIRI
DIRO
MPW
MD
TEST
Negative Supply Voltage
Analog input for Voltage
Inputs for current sensor
sames
Connection for current setting resistor
Connections for crystal or ceramic resonator
(OSC1 = Input ; OSC2 = Output)
Pulse rate output
Pulse rate output
Rated conditions select
Motor pulse rate select
Direction input
Direction output
Motor pulse width select
Motor driver configuration select
Manufacturer test pin. Connect to VSS for
normal operation.
SA9602M
FUNCTIONAL DESCRIPTION
The SA9602M 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 SA9602M generates pulses, the
frequency of which is proportional to the power consumption. Two frequency outputs
(MOTOR and LED) are available. The pulse rate follows the instantaneous power
consumption measured.
The motor drive pin can be configured as a unipolar or bipolar output using input MD. This
choice allows the manufacturer to use either an impulse counter (unipolar) or stepper
motor (bipolar).
1.
2.
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 14VRMS. The current into the A/D converter input is set at 14µARMS at
nominal mains voltage, via resistor R4 (1MΩ).
Different pulse rates are available at the motor drive pin. The device may be
programmed for a 1 pulse/kWh, 10 pulses/kWh or 100 pulses/kWh output,
depending on the status of the motor pulse rate select pins MPD and MP1.
The LED pulse rate is fixed at 1000 pulses/kWh. The frequency of the motor drive
and LED pin is dependant on the settings of R0 and R1 which allow selection of
different rated conditions. Rated conditions such as 230V/40A, 230V/60A, 230V/
80A and 230V/100A may be chosen. This facility allows meter manufacturers to
cater for a wide range of metering applications with minimal design changes.
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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5/16
SA9602M
V DD
IIP
CURRENT
SENSOR
INPUTS
V SS
AI
V DD
IIN
V SS
V DD
IVP
VOLTAGE
SENSOR
INPUT
V SS
AV
GND
DR-01288
3.
4.
5.
6/16
Electrostatic Discharge (ESD) Protection
The SA9602M integrated circuit's inputs/outputs are protected against ESD.
Power Consumption
The power consumption rating of the SA9602M integrated circuit is less than
30mW.
Output Signals
The motor drive output pulse is defined by the status of the MD input pin: MD=0 for
unipolar; and MD=1 for bipolar. Note that the LED output pulses at a high frequency
(1160Hz at rated conditions, irrespective of the R0, R1 inputs) when MD=0, this
mode is very usefull for fast callibration during manufacturing. The wave forms for
the two types of output driving methods are show below:
sames
SA9602M
MOTOR DRIVE WAVEFORM
MOTOR
V DD
Vs s
t
tm
tm
UNIPOLAR MD=0
MOTOR
V DD
Z
Vs s
t
tm
DR-01331
tm
BIPOLAR MD=1
The pulse width for t m is selected by the status of the motor pulse width input pin,
MPW. The two possible options are shown in the following table.
MOTOR PULSE WIDTH, MPW
Motor pulse width input, MPW
Signal
tm
0
1
37
71.4
Unit
ms
Note that wide pulses (MPW = 1) are not allowed with a high pulse rate specified
by R1 = 1. The pulse rate of the motor driver ouput of the S9602M is selected by
the inputs MP1 and MP0. Four pulse rate options are available as shown in tabular
form below.
PULSE RATE SELECTION
Pulse Rate Selection Input
MP1
MP0
0
0
1
1
0
1
0
1
sames
Motor drive output
selection
1
10
100
1000
Unit
Wh/pulse
Wh/pulse
Wh/pulse
Wh/pulse
7/16
SA9602M
The pulse rate of the LED output is fixed at 1000 pulses/kWh when MD = 1. This
high rate of pulses is preferred for such tasks as calibration, verification and
monitoring of consumption rate. The LED waveform is as shown below:
LED PULSE OUTPUT
LE D
VDD
V SS
dr-01332
t LED
LED PULSE WIDTH
Signal
Motor driver configuration, MD
0
71.4µs
t LED
6.
1
10ms
Direction, Indication and Selection
The SA9602M provides information on the energy flow direction on pin DIRO.
A logic 0 on pin DIRO indicates reverse energy flow. Reverse energy flow is defined
as the condition where the voltage sense input and current sense input are out of
phase.
Positive energy flow, when voltage sense and current sense input are in phase, is
indicated on pin DIRO a logic 1.
The DIRO pin may be used to drive a LED in order to indicate reverse energy.
DIRECTION INDICATION
Signal Output
DIRO
8/16
sames
Value
Description
0
Reverse energy flow
1
Forward energy flow
SA9602M
The SA9602M allows selection of the form of energy to be measured: forward
energy, reverse energy, or bidirectional energy. Selection is achieved by means of
the DIRI input. A table of possible settings for DIRI is shown below:
DIRECTION SELECTION
Signal Input DIRI
0
Motor pulses only for
reverse energy
Motor pulses only for
forward energy
Motor pulse for
bidirectional energy
1
DIRO
7.
Description
Condition
Default pull up input
DIRO connected to
DIRI
Rated Condition Select
The user selectable output frequencies for the MOTOR output and LED pulse rate
will allow a meter manufacturer to build meters for a 5-4-3-2 scaling ratio of rated
current.
The table below shows the various options which can be selected using pins R0 and
R1.
RATED CONDITION SELECT
MD
R1
R0
1
1
1
0
0
1
1
0
1
0
1
1
Rated Conditions
LED Output (1000
pulses/kWh)
230V
230V
230V
230V
2.55Hz
3.83Hz
5.11Hz
6.39Hz
/
/
/
/
40A
60A
80A
100A
Scaling of the frequency for the MOTOR drive output pulses takes effect in the
same manner as shown for the LED output pulse rate.
This feature is particularly useful in circumstances where a manufacturer requires
a meter for use in a system rated for two different conditions, for exampe 230V/80A
and 230V/40A. Previously such a requirement would have necessitated alteration
of both the input current sensing resistors and the output measuring/counting block.
With the rated condition select, using R0 and R1, the SA9602M allows for the
development of different rated meters requiring minimal changes.
sames
9/16
SA9602M
For example, a meter manufacturer may wish to build
(a)
Meter rated for 230V/80A, 1000 pulses/kWh
(b)
Meter rated for 230V/40A, 1000 pulses/kWh
If the LED output pulse rate is considered, then
(a)
230V/80A, R1=1 and R0=0
The table of Rated Condition Select shows that for this case the frequency for the
LED output at rated conditions is 5.11Hz.
Hence,
VI
230 x 80
1 pulse =
=
3600 Ws
fp
5.11
˜
(b)
230V/40A, R1=0 and R0=0
The table of Rated Condition Select shows that in this case the frequency for the
LED output at rated conditions in 2.55Hz
Hence,
1 pulse =
VI
fp
=
230 x 40
2.55
˜
3600 Ws
As the examples shows, the SA9602M can be configured easily for use in meters
for different rated systems. The only changes which must be implemented are:
selection of current sense resistors for the expected rated load current; and
selection of settings for R0 and R1.
10/16
sames
SA9602M
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 SA9602M 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 SA9602M 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:
fLED = 11.16 * FOUTX *
Where FOUTX
FOSC
3.58MHz
*
II .IV
IR2
= Frequency for selected rated condition
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.
sames
11/16
SA9602M
Specifications:
Figure 1: Application Circuit see
specification for details.
Shunt resistor for current sensing.
Rated conditions 230V/80A.
Bidirectional metering.
Motor step of 1Wh/pulse.
Bipolar Motor.
M
D R -0 1 3 2 9
C 10
C9
9
10
7
8
C 15
X T AL
11
D4
PUL SE
14
13
12
16
5
12/16
R 10
ZD 2
C 14
D2
ZD 1
C 13
R5
SU P P L Y
L O AD
C 11
R3
D1
R9
R7
R2
R1
6
IC -1
18
17
3
4
15
DIRE CT ION
19
2
R4
20
1
D3
R6
GROUND
PL ANE
R 11
R 12
37ms Motor pulses.
R SH
sames
SA9602M
Parts List for Application Circuit: Figure 1
Item Symbol
Description
1
IC-1
SA9602M
2
D1
Diode, Silicon, 1N4148
3
D2
Diode, Silicon, 1N4148
4
ZD1
Diode, Zener, 2.4V, 200mW
5
ZD2
Diode, Zener, 2.4V, 200mW
6
7
8
9
10
11
12
13
14
15
16
17
D3
D4
XTAL
R1
R2
R3
R4
R5
R6
R7
R9
R10
Light emitting diode
Light emitting diode
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%
18
19
20
21
22
23
24
25
26
R11
R12
C9
C10
C11
C13
C14
C15
RSH
Resistor, 1k, 1/4W, 5% carbon
Resistor, 1k, 1/4W, 5% carbon
Capacitor, 100nF
Capacitor, 100nF
Capacitor, 0.47µF, 250VAC, polyester
Capacitor, 100µF
Capacitor, 100µF
Capacitor, 820nF
Shunt Resistor
Detail
DIP-20/SOIC-20
Colour burst TV
Note 1
Note 1
Note 4
Note 4
Note 2
Note 8
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.
Note 4: Additional Capacitors may be required depending on the change needed to step
the motor.
sames
13/16
SA9602M
Specification
Figure 2: Application circuit see
specification for details.
Current transformer for current sensing
Rated conditions 230V/40A
Unidirectional metering phase reversal
indication
Motor step at 10 steps/kWh
Impulse counter
D3
11
C9
12
10
X T AL
13
9
16
5
14
17
8
18
4
7
19
2
3
6
20
L O AD
14/16
sames
D R-01330
L
N
SU P PL Y
CT
2 .5 V D C
5V
R9
R8
R2
R3
R7
C 10
R SH
1
I C -1 1 5
R4
C 11
R6
D I R E CT I O N
R 10
S
Motor step at wide pulses.
SA9602M
Parts List for Application Circuit: Figure 2
Item Symbol
1
IC-1
2
XTAL
3
RSH
4
R1
5
R2
6
R3
7
R4
8
R6
9
R7
10
R8
11
R10
12
R9
13
C9
14
C10
15
C11
16
CT
17
D1
Note 1:
Note 2:
Note 3:
Note 4:
Description
SA9602M
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 1K, 1/4W, 5% carbon
Resistor, 2.2k, 1/4W, 1%, metal
Capacitor, 820nF
Capacitor, 100nF
Capacitor
Current transformer
Light emitting diode
Detail
DIP-20/SOIC-20
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
SA9602MPA
DIP-20
SA9602MSA
SOIC-20
sames
15/16
SA9602M
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 adress 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:
16/16
012 333-6021
012 333-8071
sames
Tel:
Fax:
Int +27 12 333-6021
Int +27 12 333-8071