Single Phase Power/Energy Metering IC with
Tamper Detection
SA9607M
FEATURES
■
Provides direct interface to mechanical counters
■
Total power consumption rating below 25mW
■
Monitors Live and Neutral for tamper detection
■
Adaptable to different types of sensors
■
Performs bidirectional energy measurement
■
Operates over a wide temperature range
■
Various setup modes selectable
■
Precision voltage reference on chip.
■
Meets the IEC 521/1036 Specification for Class 1 AC Watt
hour meters
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.
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 electromechanical counter directly.
Two current sensor inputs allow the measurement of energy
consumption on both the live and neutral.
The SA9607M integrated circuit is available in 20 pin dual-inline plastic (DIP-20) and small outline (SOIC-20) package
types.
Direction detection of energy flow as well as other common
tamper conditions are flagged.
VDD VS S
PO W ER 1 (D IG ITA L)
IIN1
IIP1
ANA LO G
SIG NAL
PRO CES SING
AND
PO W ER
CAL CUL ATIO N
IIN2
IIP2
IV P
G ND
D r-0 15 58
ELT
CO M PAR ATO R
PO W ER 2 (D IG ITA L)
DIR O
L ED
MOP
MON
PO W ER
TO
PUL SE RATE
VO LTAG E
REF.
O SC
VRE F
O SC1 O SC2
M P1 M P0
SE L1
RAT ED
Figure 1: Block Diagram
SPEC-0005 (REV. 2)
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26-05-00
SA9607M
ELECTRICAL CHARACTERISTICS
(VDD = 2.5V, VSS = -2.5V, over the temperature range -10°C to +70°C#, unless otherwise specified.)
Parameter
Symbol
Min
Max
Unit
To
-25
+85
°C
Supply Voltage: Positive
V DD
2.25
2.75
V
Supply Voltage: Negative
VSS
-2.75
-2.25
V
Supply Current: Positive
IDD
5
6
mA
Supply Current: Negative
I SS
5
6
mA
Operating temp. range
Typ
Condition
Current Sensor Inputs (Differential)
Input Current Range
I II
-25
+25
µA
Peak value
Input Current Range
I IV
-25
+25
µA
Peak value
Pin DIRO, LED
Output High Voltage
Output Low Voltage
VOH
VOL
V DD-1
VSS+1
V
V
IOH = -2mA
IOL = 5mA
Pin MP0, MP1
Input High Voltage
Input Low Voltage
VIH
VIL
V DD-1
VSS+1
V
V
Output High Voltage
VOH
V DD-1
Output Low Voltage
VOL
Pin RATED, SEL1, ELT
Input High Voltage
Input Low voltage
VIH
VIL
Voltage Sensor Input (Asymmetrical)
Pull down
Pin MOP, MON
V
IOH = -2mA
VSS+1
V
IOL = 5mA
VSS+1
V
V
Bi-direct**
V DD-1
Pin VREF
With R = 24kΩ
Ref. Current
Ref. Voltage
Oscillator
-I R
VR
45
1.1
50
55
1.3
µA
V
connected to VSS
Referred to VSS
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 µS.
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Min
Max
Unit
Supply Voltage
VDD -VSS
-0.3
6.0
Current on any pin
IPIN
-150
+150
mA
V
Storage Temperature
TSTG
-40
+125
°C
Operating Temperature
TO
-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.
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SA9607M
PIN DESCRIPTION
PIN
Designation Description
Analog Ground. The voltage to this pin should be mid-way between V DD and VSS.
20
GND
8
VDD
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.
14
VSS
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.
19
IVP
The current into the A/D converter should be set at 14µARMS at nominal mains voltage. The voltage sense
input saturates at an input current of ±25µA peak.
1, 2
3, 4
IIN1, IIP1
IIN2, IIP2
Inputs for current sensor - channel 1 and Channel 2. The shunt resistor voltage from each channel is
converted to a current of 16µARMS at rated conditions. The current sense input saturates at an input current
of ±25µA peak.
5
VREF
This pin provides the connection for the reference current setting resistor. A 24kΩ resistor connected to VSS
set the optimum operating condition.
6, 7
MP0, MP1 Motor pulse rate select inputs. Described under Input Signals.
9, 12
MON, MOP 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.
13
LED
15
RATED
16
SEL1
Current channel select output. This output indicates which channel is been used for kWh metering.
17
ELT
Earth loop tamper output. This output indicates an earth loop tamper condition.
18
DIRO
Rated condition select input. Described under Input Signals.
Direction output. This output indicates the energy flow direction.
10, 11 OSC1, OSC2 Connections for a crystal or ceramic resonator. (OSC1 = input; OSC2 = Output)
ORDERING INFORMATION
IIN 1
1
20
GND
IIP1
2
19
IV P
IIN 2
3
1 8 D IR O
IIP2
4
1 7 ELT
VR EF
5
16
SE L1
M P1
6
15
R AT ED
M P0
7
1 4 VS S
VD D
8
1 3 L ED
MON
9
12 MOP
11 O S C 2
OS C1 10
D R -0 1557
Figure 2: Pin connections: Package: Dip-20, SOIC-20
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Part Number
Package
SA9607MPA
SA9607MSA
DIP-20
SOIC-20
SA9607M
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.
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.
The integrated circuit includes all the required functions for 1phase 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.
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
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
Frequency outputs (MOP, MON and LED) are available. The
pulse rate on these pins follows the instantaneous active
power consumption measured.
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.
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 VSS.
V DD
POWER CALCULATION
In the Application Circuit (Figure 7), the voltage drop across
the shunt will be between 0 and 16mVRMS (0 to 80A through a
shunt resistor of 200µΩ). The voltage accross the current
transformers terminating resistor will also be between 0 and
16mVRMS. These voltages are converted to currents of between
0 and 16µARMS for each current sense inputs by means of
resistors R1 and R 2 (channel 1) as well as R3 and R4. (channel
2).
IIP
CURRENT
SENSOR
INPUTS
V SS
AI
V DD
IIN
V SS
The current sense input saturates at an input current of ±25µA
peak.
V DD
IVP
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 R6 (1MΩ).
VOLTAGE
SENSOR
INPUT
Different pulse rates are available at the MOP and MON pins.
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 MP0 and MP1.
A
V
GND
DR-01288
Figure 3: Analog Input Internal Configuration
The LED pulse rate is fixed at 6400 pulses per kWh. Rated
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V SS
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SA9607M
INPUT SIGNALS
OUTPUT SIGNALS
VREF
The VREF pin is the reference for the bias resistor and is the
recommended point for calibration. With a bias resistor of
24kΩ 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 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:
VDD
MO P
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:
VSS
VDD
MO N
Pulse rate selection
Pulse Rate Selection
Input
VSS
Motor drive
output
Unit
MP1
MP0
selection
V SS
VSS
1
pulses/kWh
V SS
VDD
10
pulses/kWh
VDD
VSS
100
pulses/kWh
VDD
VDD
Device test mode
D R -0 1 5 5 9
tm
tm
tm
tm = 142ms
Figure 5: Motor drive waveform
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.
VDD
LED
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).
VSS
D R - 01332
tLED = 10ms
Figure 4: LED pulse output
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.
Rated condition select (RATED)
Signal Input RATED
Rated Conditions
VSS
230V / 20A
OPEN
230V / 40A
VDD
230V / 60A
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Signal
Output
Value
SEL1
0
1
Description
Channel 1selected (IIN1/IIP1)
Channel 2selected (IIN2/IIP2)
SA9607M
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
DIRO
Value
Description
1
Reverse energy flow
0
Forware energy flow
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SA9607M
TYPICAL APPLICATION
Where:
IL = Line current/CT-ratio
R10 = Termination resistor
R11 = Termination resistor
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.
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 14µARMS.
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.
Bias Resistor
R7 defines all on-chip bias and reference currents. With R7 =
24kΩ, optimum conditions are set.
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 16µARMS into the current
channels of the SA9607M at IMAX (rated current of the meter).
The voltage drop of the resistors R10 and R17 should be at least
20mV.
R7 may be varied within ±10% for calibration purposes. Any
change to R7 will affect the output quadratically (i.e.: R 7 = +5%,
fP = +10%).
Current Channel 1
R1= R2= (IL/16µA RMS) x R10/2
Current Channel 2
R3= R4= (IL/16µA RMS) x R11/2
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SA9607M
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LO A D
N
L
R9
R8
C3
R5
P1
R1
R2
R3
R4
R7
R6
C4
D IR
ELT
IC - 1
SEL
R 15
R 16
R 17
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Figure 7: Application Circuit
P2
SA 9607 M
PUL SE
MO TO R
D R -0 1 56 0
X TA L
C6
R 12
VDD
IC2
D1 D2
R 13
C1
MOV
GND
C2
R 14
D3 D4
VSS
N
L
SU PPLY
R 18
M1
C5
SA9607M
Parts List for Application Circuit: Figure 7
Item
Symbol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
IC1
D1
D2
D3
D4
D5
D6
D7
D8
XTAL
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
P1
P2
C1
C2
C3
C4
C5
C6
CT1
CT2
TX
IC2
M1
M0V
Note
Note
Note
Note
1:
2:
3:
4:
Description
Detail
SA9607M
Diode, Silicon 1N4007
Diode, Silicon 1N4007
Diode, Silicon 1N4007
Diode, Silicon 1N4007
Light emmitting diode, Red
Light emmitting diode, Green
Light emmitting diode, Amber
Light emmitting diode, Green
Crystal, 3.5759MHz
Resistor, 1/4W, 1%, metal
Resistor, 1/4W, 1%, metal
Resistor, 1/4W, 1%, metal
Resistor, 1/4W, 1%, metal
Resistor, 1M, 1/4W, 1%, metal
Resistor, 24k, 1/4W, 1%, metal
Resistor, 22k, 1/4W, 1%, metal
Resistor, 180k, 1/4W, 1%, metal
Resistor, 200k, 1/4W, 1%, metal
Resistor, 1/4W, 1%, metal
Resistor, 1/4W, 1%, metal
Resistor, 10Ω, 2W, Wire wound
Resistor, 1k, 1/4W, 1%, metal
Resistor, 1k, 1/4W, 1%, metal
Resistor, 1k, 1/4W, 5%, carbon
Resistor, 1k, 1/4W, 5%, carbon
Resistor, 1k, 1/4W, 5%, carbon
Resistor, 1k, 1/4W, 5%, carbon
Multi-turn, Trim Pot
Multi-turn, Trim Pot, 5k
Capacitor, 100µF, 16V, electrolytic
Capacitor, 100µF, 16V, electrolytic
Capacitor
Capacitor, 220nF
Capacitor, 220nF
Capacitor, 820nF
Current Transformer
Current Transformer
Transformer, 230V/9V
78LC05, Voltage regulator
Bipolar step motor
400V, Metal oxide varistor
DIP-20/SOIC-20
Note
Note
Note
Note
1
1
1
1
Note 2
Note 2
Note 2
Note 4
Note 3
Resistor (R1, R2, R3 and R4) values are dependant upon the selected value of R10 and R11.
See TYPICAL APPLICATION when selecting the value of R10 and R11.
Capacitor (C6) to be positioned as closed to Supply Pins (VDD & VSS) of IC-1, as possible.
Capacitor (C7) selected to minimize phase error introduced by current transformer (typically 1.5µF for normal CT5,
approx. 100nF)
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SA9607M
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 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
Tel: (012) 333-6021
Tel: Int +27 12 333-6021
Fax: (012) 333-8071
Fax: Int +27 12 333-8071
33 Eland Street
Koedoespoort Industrial Area
Pretoria
Republic of South Africa
P O Box 15888
33 Eland Street
Lynn East 0039
Republic of South Africa
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