SPEC-0005 (REV. 2)
26-05-00
FEATURES
s
Provides direct interface to mechanical counters
s
Monitors Live and Neutral for tamper detection
s
Performs bidirectional energy measurement
s
Various setup modes selectable
s
Meets the IEC 521/1036 Specification for Class 1 AC Watt
hour meters
Single Phase Power/Energy Metering IC with
Tamper Detection
SA9607M
s
Total power consumption rating below 25mW
s
Adaptable to different types of sensors
s
Operates over a wide temperature range
s
Precision voltage reference on chip.
DESCRIPTION
The SAMES SA9607M is a single-phase bidirectional energy
metering integrated circuit. It provides a mono-chip solution
for energy meters with electro-mechanical displays, such as
stepper motors and impulse counters.
Two current sensor inputs allow the measurement of energy
consumption on both the live and neutral.
Direction detection of energy flow as well as other common
tamper conditions are flagged.
The power consumption on both the live and neutral are
continuously measured and the larger of the two is selected
for energy metering.
The SA9607M drives the calibration LED and the electro-
mechanical counter directly.
The SA9607M integrated circuit is available in 20 pin dual-in-
line plastic (DIP-20) and small outline (SOIC-20) package
types.
Figure 1: Block Diagram
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IIN 1
IIP1
IIP2
IV P
AN A LO G
SIG N AL
PR O -
C ES SIN G
AN D
PO W ER
C AL -
C U L ATIO N
C O M -
PAR ATO R
PO W ER
TO
PU L SE R ATE
VO LTAG E
R EF.
O SC
ELT
VS S
VD D
SE L1
D IR O
L ED
M O P
M O N
R AT ED
VR E F
D r-0 15 58
O SC 1 O SC 2
M P0
M P1
PO W ER 1 (D IG ITA L)
PO W ER 2 (D IG ITA L)
G N D
IIN 2
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ELECTRICAL CHARACTERISTICS
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10C to +70C
#
, unless otherwise specified.)
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Min
Max
Unit
Supply Voltage
V
DD
-V
SS
-0.3
6.0
V
Current on any pin
I
PIN
-150
+150
mA
Storage Temperature
T
STG
-40
+125
C
Operating Temperature
T
O
-25
+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.
Parameter
Symbol
Min
Typ
Max
Unit
Condition
Operating temp. range
T
o
-25
+85
C
Supply Voltage: Positive
V
DD
2.25
2.75
V
Supply Voltage: Negative
V
SS
-2.75
-2.25
V
Supply Current: Positive
I
DD
5
6
mA
Supply Current: Negative
I
SS
5
6
mA
Current Sensor Inputs (Differential)
Input Current Range
I
II
-25
+25
A
Peak value
Voltage Sensor Input (Asymmetrical)
Input Current Range
I
IV
-25
+25
A
Peak value
Pin DIRO, LED
Output High Voltage
V
OH
V
DD
-1
V
I
OH
= -2mA
Output Low Voltage
V
OL
V
SS
+1
V
I
OL
= 5mA
Pin MP0, MP1
Pull down
Input High Voltage
V
IH
V
DD
-1
V
Input Low Voltage
V
IL
V
SS
+1
V
Pin MOP, MON
Output High Voltage
V
OH
V
DD
-1
V
I
OH
= -2mA
Output Low Voltage
V
OL
V
SS
+1
V
I
OL
= 5mA
Pin RATED, SEL1, ELT
Bi-direct**
Input High Voltage
V
IH
V
DD
-1
V
Input Low voltage
V
IL
V
SS
+1
V
Pin VREF
With R = 24k
Ref. Current
-I
R
45
50
55
A
connected to V
SS
Ref. Voltage
V
R
1.1
1.3
V
Referred to V
SS
Oscillator
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
#
Extended Operating Temperature Range available on request.
** Switched to output mode every 1.1 seconds for 140 S.
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Figure 2: Pin connections: Package: Dip-20, SOIC-20
ORDERING INFORMATION
Part Number
Package
SA9607MPA
DIP-20
SA9607MSA
SOIC-20
PIN DESCRIPTION
D R -0 1557
1
IIN 1
G N D
SE L1
IIP1
IV P
R AT ED
IIN 2
D IR O
VS S
IIP2
VR EF
M P1
M P0
VD D
ELT
L ED
M O P
O S C 2
O S C 1
M O N
2
3
4
5
6
1 5
1 4
1 3
1 2
11
1 0
9
8
7
1 6
1 7
1 8
1 9
2 0
PIN
20
8
14
19
1, 2
3, 4
5
6, 7
9, 12
13
15
16
17
18
10, 11
Description
Analog Ground. The voltage to this pin should be mid-way between V
DD
and V
SS
.
Positive supply voltage. The voltage to this pin is typically +2.5V if a shunt resistor is used for current sensing
or in the case of a current transformer a +5V supply can be applied.
Negative Supply Voltage. The voltage to this pin is typicall -2.5V if a shunt resistor is used for current sensing
or in the case of a current transofer a 0V supply can be applied.
The current into the A/D converter should be set at 14A
RMS
at nominal mains voltage. The voltage sense
input saturates at an input current of 25A peak.
Inputs for current sensor - channel 1 and Channel 2. The shunt resistor voltage from each channel is
converted to a current of 16A
RMS
at rated conditions. The current sense input saturates at an input current
of 25A peak.
This pin provides the connection for the reference current setting resistor. A 24k
resistor connected to V
SS
set the optimum operating condition.
Motor pulse rate select inputs. Described under Input Signals.
Motor pulse outputs. These outputs can be used to drive an impulse counter or stepper motor directly.
Calibration LED output. Refer to section Led Output (LED) for the pulse rate output options.
Rated condition select input. Described under Input Signals.
Current channel select output. This output indicates which channel is been used for kWh metering.
Earth loop tamper output. This output indicates an earth loop tamper condition.
Direction output. This output indicates the energy flow direction.
Connections for a crystal or ceramic resonator. (OSC1 = input; OSC2 = Output)
Designation
GND
V
DD
V
SS
IVP
IIN1, IIP1
IIN2, IIP2
VREF
MP0, MP1
MON, MOP
LED
RATED
SEL1
ELT
DIRO
OSC1, OSC2
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FUNCTIONAL DESCRIPTION
The SA9607M 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 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
SA9607M incorporates an anti-tamper scheme by continuously
measuring the power consumption on both LIVE and NEUTRAL
lines. A fault is indicated when these measurements differ by
more than 12.5%. The SA9607M generates pulses with a
frequency proportional to the larger of the two current
measurements. The source (LIVE or NEUTRAL) for these
pulses is indicated on the SEL1 pin.
Frequency outputs (MOP, MON and LED) are available. The
pulse rate on these pins follows the instantaneous active
power consumption measured.
A low voltage stepper may be driven directly from the device
by connecting it between the MOP and MON pins, alternatively
an impulse impulse counter may be driven directly by connecting
it between MOP and V
SS
.
POWER CALCULATION
In the Application Circuit (Figure 7), the voltage drop across
the shunt will be between 0 and 16mV
RMS
(0 to 80A through a
shunt resistor of 200
). The voltage accross the current
transformers terminating resistor will also be between 0 and
16mV
RMS.
These voltages are converted to currents of between
0 and 16A
RMS
for each current sense inputs by means of
resistors R
1
and R
2
(channel 1) as well as R
3
and R
4.
(channel
2).
The current sense input saturates at an input current of 25A
peak.
For the voltage sensor input, the mains voltage (230VAC) is
divided down through a divider to 14V
RMS
. The current into the
A/D converter input is set at 14A
RMS
at nominal mains voltage,
via resistor R
6
(1M
)
.
Different pulse rates are available at the MOP and MON pins.
The device may be programmed for a 1 pulse/kWh, 10 pulse
s/
kWh or 100 pulses
/kWh output, depending on the status of
the motor pulse rate select pins MP0 and MP1.
The LED pulse rate is fixed at 6400 pulses per kWh. Rated
conditions such as 230V/20A, 230V/40A and 230V/60A may
be chosen with the rated pin. 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 A
I
and
A
V
generate virtual shorts on the signal inputs. Exact
duplications of the input currents are generated for the analog
signal processing circuitry.
ELECTROSTATIC DISCHARGE (ESD)
PROTECTION
The SA9607M integrated circuit's input's/outputs are protected
against ESD.
POWER CONSUMPTION
The power consumption rating of the SA9607M integrated
circuit is less than 30mW.
VOLTAGE
SENSOR
INPUT
IVP
DR-01288
S S
V
CURRENT
SENSOR
INPUTS
IIP
IIN
S S
V
V DD
S S
V
V DD
DD
V
GND
A
V
A
I
Figure 3: Analog Input Internal Configuration
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INPUT SIGNALS
VREF
The VREF pin is the reference for the bias resistor and is the
recommended point for calibration. With a bias resistor of
24k
optimum conditions are set. It may be varied within
10% for calibration purposes. Any changes to the bias
resistor will affect the output pulse rate quadratically (i.e.
(
R
= +5%,
(
f=10%).
Motor pulse rate select (MP1 and MP0)
The pulse rate of the motor driver ouput of the SA9607M is
selected by the inputs MP1 and MP0. Three pulse rate options
are available as shown in the following table:
Pulse rate selection
OUTPUT SIGNALS
Motor output (MOP, MON)
The MON pulse will follow the MOP pulse within 142ms. This
prevents that the motor armature is in the wrong position after
a power failure. Both MOP and MON outputs are active high.
The motor drive wave forms are shown below:
LED output (LED)
The LED output pulse at a fixed rate of 6400 pulses per kWh.
The LED output is active low. The LED waveform is shown
below:
Please note that the device will not perform metering functions
as described in this document while in test mode.
Rated condition select (RATED)
The rated condition select pin gives the option of having a
3:2:1 scaling ratio of the rated current easily available. This
feature is particularly useful in circumstances where a
manufacturer requires a meter for use in a system rated for
two different conditions, for example 230V/60A and 230V/
40A. With the rated condition select the SA9607M allows for
the development of different rated meters requiring minimal
changes. The following table below lists the options available
(assuming the rated condition to be 230V/60A).
Rated condition select (RATED)
Motor drive
output
selection
Unit
MP1
MP0
V
SS
V
SS
V
DD
V
DD
V
SS
V
DD
V
SS
V
DD
1
10
100
Device test
mode
pulses/kWh
pulses/kWh
pulses/kWh
Pulse Rate Selection
Input
Signal Input RATED
V
SS
OPEN
V
DD
Rated Conditions
230V / 20A
230V / 40A
230V / 60A
Figure 5: Motor drive waveform
t
m
= 142ms
VD D
VD D
VSS
VSS
MO N
MO P
t
m
t
m
t
m
D R -0 1 5 5 9
Figure 4: LED pulse output
t
LED
= 10ms
V D D
V S S
LED
t
L E D
D R - 0 1 3 3 2
Selected input indication (SEL1)
The SA9607M continuously compares the power consumptions
on current channel 1 inputs and current channel 2 inputs. The
larger of the two measurements are used for metering. The
SEL1 output pin indicates which channel is currently being
used for the pulse output.
Signal
Output
Description
0
1
Channel 1selected (IIN1/IIP1)
Channel 2selected (IIN2/IIP2)
SEL1
Value
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Earth loop tamper indication (ELT)
If the power measurments from both current channels differ
by more than 12.5%, (indicating a earth loop tamper condition),
the ELT output is set to zero. The SA9607M continues to
generate output pulses from the larger of the two measured
powers in this condition. The ELT output is active low.
Direction indication (DIRO)
The SA9607M provides information about the energy flow
direction on pin DIRO.
A logic 1 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 (greater
than 90 degrees).
Positive energy flow, when voltage sense and current sense
input are in phase, is indicated on pin DIRO a logic 0.
The DIRO pin may be used to drive a LED in order to indicate
reverse energy.
Signal
Output
Description
1
0
Reverse energy flow
Forware energy flow
DIRO
Value
SA9607M
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TYPICAL APPLICATION
In Figure 1, the components required for a stand-alone power
metering application, is shown.
Current transformers are used for mains current sensing. The
channel showing the highest power consumption will be
selected by the SA9607M for energy metering.
The most important external components for the SA9607M
integrated circuit are the current sense resistors, the voltage
sense resistors as well as the bias setting resistor.
Current Sense Resistors
The resistors R1, R2, R3 and R4 define the current level into
the current sense inputs of the device. The component should
be selected for input currents of 16ARMS into the current
channels of the SA9607M at I
MAX
(rated current of the meter).
The voltage drop of the resistors R
10
and R
17
should be at least
20mV.
Where:
IL = Line current/CT-ratio
R10 = Termination resistor
R11 = Termination resistor
Voltage Sense Resistors
R9, R8, R6 and R5 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 14A
RMS
.
Bias Resistor
R
7
defines all on-chip bias and reference currents. With R
7
=
24k
, optimum conditions are set.
R
7
may be varied within 10% for calibration purposes. Any
change to R
7
will affect the output quadratically (i.e.: R
7
= +5%,
fP = +10%).
Current Channel 1
R
1
= R
2
= (I
L
/16A
RMS
) x R
10
/2
Current Channel 2
R
3
= R
4
= (I
L
/16A
RMS
) x R
11
/2
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Figure 7: Application Circuit
IC - 1
S A 9607 M
R 8
R 1
R 5
R 6
C 4
C 5
R 1 5
R 1 6
R 1 7
R 1 8
M 1
PUL SE
SEL
ELT
D IR
MO TO R
X TA L
C 6
S U P P LY
D R -0 1 56 0
N
L
LO A D
N
L
R 1 2
M O V
D 1
D 2
IC 2
C 1
D 4
C 2
R 1 3
R 1 4
D 3
V S S
G N D
V D D
P 2
C 3
R 2
R 3
R 4
R 7
R 9
P 1
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Note 1:
Resistor (R1, R2, R3 and R4) values are dependant upon the selected value of R10 and R11.
Note 2:
See TYPICAL APPLICATION when selecting the value of R10 and R11.
Note 3:
Capacitor (C6) to be positioned as closed to Supply Pins (V
DD
& V
SS
) of IC-1, as possible.
Note 4:
Capacitor (C7) selected to minimize phase error introduced by current transformer (typically 1.5F for normal CT5,
approx. 100nF)
Parts List for Application Circuit: Figure 7
Item
Symbol
Description
Detail
1
IC1
SA9607M
DIP-20/SOIC-20
2
D1
Diode, Silicon 1N4007
3
D2
Diode, Silicon 1N4007
4
D3
Diode, Silicon 1N4007
5
D4
Diode, Silicon 1N4007
6
D5
Light emmitting diode, Red
7
D6
Light emmitting diode, Green
8
D7
Light emmitting diode, Amber
9
D8
Light emmitting diode, Green
10
XTAL
Crystal, 3.5759MHz
11
R1
Resistor, 1/4W, 1%, metal
Note 1
12
R2
Resistor, 1/4W, 1%, metal
Note 1
13
R3
Resistor, 1/4W, 1%, metal
Note 1
14
R4
Resistor, 1/4W, 1%, metal
Note 1
15
R5
Resistor, 1M, 1/4W, 1%, metal
16
R6
Resistor, 24k, 1/4W, 1%, metal
17
R7
Resistor, 22k, 1/4W, 1%, metal
18
R8
Resistor, 180k, 1/4W, 1%, metal
19
R9
Resistor, 200k, 1/4W, 1%, metal
20
R10
Resistor, 1/4W, 1%, metal
Note 2
21
R11
Resistor, 1/4W, 1%, metal
Note 2
22
R12
Resistor, 10
,
2W, Wire wound
23
R13
Resistor, 1k, 1/4W, 1%, metal
24
R14
Resistor, 1k, 1/4W, 1%, metal
25
R15
Resistor, 1k, 1/4W, 5%, carbon
26
R16
Resistor, 1k, 1/4W, 5%, carbon
27
R17
Resistor, 1k, 1/4W, 5%, carbon
28
R18
Resistor, 1k, 1/4W, 5%, carbon
29
P1
Multi-turn, Trim Pot
30
P2
Multi-turn, Trim Pot, 5k
Note 2
31
C1
Capacitor, 100F, 16V, electrolytic
32
C2
Capacitor, 100F, 16V, electrolytic
33
C3
Capacitor
Note 4
34
C4
Capacitor, 220nF
35
C5
Capacitor, 220nF
36
C6
Capacitor, 820nF
Note 3
37
CT1
Current Transformer
38
CT2
Current Transformer
39
TX
Transformer, 230V/9V
40
IC2
78LC05, Voltage regulator
41
M1
Bipolar step motor
42
M0V
400V, Metal oxide varistor
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Any Sales or technical questions may be posted to our e-mail adress below:
energy@sames.co.za
For the latest updates on datasheets, please visit our web site:
http://www.sames.co.za.
SOUTH AFRICAN MICRO-ELECTRONIC SYSTEMS (PTY) LTD
Tel: (012) 333-6021
Tel: Int +27 12 333-6021
Fax: (012) 333-8071
Fax: Int +27 12 333-807
1
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.
P O Box 15888
33 Eland Street
Lynn East 0039
Republic of South Africa
33 Eland Street
Koedoespoort Industrial Area
Pretoria
Republic of South Africa
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