SA2007MSA [SAMES]
Single Phase Power/Energy Metering IC with Tamper Detection; 单相功率/电能计量IC,具有篡改检测型号: | SA2007MSA |
厂家: | SAMES |
描述: | Single Phase Power/Energy Metering IC with Tamper Detection |
文件: | 总10页 (文件大小:171K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Single Phase Power/Energy Metering IC with
Tamper Detection
SA2007M
ssames
FEATURES
+
+
+
+
+
Providesdirectinterfacetomechanicalcounters
MonitorsLiveandNeutralfortamperdetection
Performsbidirectionalenergymeasurement
Varioussetupmodesselectable
+
+
+
+
+
Totalpowerconsumptionratingbelow30mW
Adaptabletodifferenttypesofsensors
Operatesoverawidetemperaturerange
Precisionvoltagereferenceon-chip
Precisionoscillatoronchip
Meets the IEC 521/1036 Specification for Class 1 AC Watt
hourmeters
DESCRIPTION
The power consumption on both the live and neutral are
continuously measured and the larger of the two is selected for
energymetering.
The SAMES SA2007M 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. A precision oscillator,
thatreplacesanexternalcrystalisintegratedonchip.
The SA2007M drives the calibration LED, the indicator LEDs
andtheelectro-mechanical counterdirectly.
Two current sensor inputs allow the measurement of energy
consumptiononboththeliveandneutral.
The SA2007M integrated circuit is available in 20 pin dual-in-
line plastic (DIP-20) and small outline (SOIC-20) package
types.
Direction detection of energy flow as well as other common
tamperconditionsareflagged.
VDD VSS
POWER 1 (DIGITAL)
IIN1
IIP1
ELT
ANALOG
SIGNAL
PRO-
COM-
POWER 2 (DIGITAL)
SEL1
PARATOR
IIN2
IIP2
CESSING
AND
POWER
CAL-
CULATION
IVP
GND
DIRO
LED
POWER
TO
PULSE RATE
MOP
MON
VOLTAGE
REF.
OSC
Dr-01558
VREF
TCLK
MP1 MP0
RATED
Figure 1: Block diagram
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SPEC-0075 (REV. 2)
PRELIMINARY
16-01-01
SA2007M
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ELECTRICAL CHARACTERISTICS
#
(V = 2.5V, V = -2.5V, over the temperature range -10°C to +70°C , unless otherwise specified.)
SS
DD
Symbol
Typ
Parameter
Min
Max
Unit
Condition
Operating temp. Range
T
-25
+85
2.75
-2.25
8.2
°C
V
O
Supply Voltage: Positive
V
DD
2.25
-2.75
4.1
Supply Voltage: Negative
Supply Current: Positive
Supply Current: Negative
Current Sensor Inputs (Differential)
V
SS
V
I
DD
5.8
5.8
mA
mA
I
SS
4.1
8.2
Input Current Range
I
II
µA
-25
+25
Peak value
Voltage Sensor Input (Asymmetrical)
I
IV
µA
-25
+25
Peak value
Input Current Range
Pin VREF
With R = 24kW
µA
V
-I
45
50
55
R
Ref. Current
Ref. Voltage
connected to V
SS
1.1
V
1.3
R
Reference to V
SS
Digital I/O
Pins DIRO, LED, MON, MOP
Output High Voltage
V
V
V -1
DD
I
= -2mA
OH
OH
V
V
V +1
SS
I
OL
= 5mA
OL
Output Low Voltage
Pins MP0, MP1, TCLK, RATED,
SEL1, ELT
Input High Voltage
Input Low Voltage
V
V
V
V
V -1
DD
IH
V +1
SS
IL
Pin RATED
V = V
I
I
mA
mA
3.1
2
7
DD
SS
IH
Pin scan current**
V = V
I
4.6
-I
IL
Pins MP0, MP1, TCLK
Pull down current
V = V
I
I
IH
µA
48
110
DD
#Extended Operating Temperature Range available on request.
** Switched to pin-scan mode every 1.1 seconds for 71µs.
ABSOLUTEMAXIMUMRATINGS*
Parameter
Symbol
Min
Max
6.0
Unit
V
mA
°C
Supply Voltage
V -V
DD
-0.3
-150
-40
SS
Currentonanypin
StorageTemperature
OperatingTemperature
I
PIN
+150
+125
+85
T
STG
T
O
-25
°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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PRELIMINARY
SA2007M
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PIN DESCRIPTION
Designation
PIN
Description
Analog Ground. The voltage to this pin should be mid-way between V and V .
SS
20
GND
DD
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.
V
DD
8
Negative 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 0V supply can be applied.
V
SS
14
The current into the A/D converter should be set at 14µA at nominal mains voltage.
RMS
19
IVP
The voltage sense input saturates at an input current of ±25µA peak.
Inputs for current sensor - channel 1 and channel 2. The shunt resistor voltage from each
1, 2,
3, 4
IIN1, IIP1
IIN2, IIP2
channel is converted to a current of 16µA at rated conditions. The current sense input
RMS
saturates at an input current of ±25µA peak.
This pin provides the connection for the reference current setting resistor. A 24kW resistor
5
VREF
connected to V sets the optimum operating condition.
SS
Motor pulse rate select inputs. Described under Input Signals.
6, 7
MP0, MP1
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
15
16
LED
RATED
SEL1
Rated condition select input. Described under Input Signals.
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.
Direction output. This output indicates the energy flow direction.
DIRO
18
NC
No Connection.
11
10
Test input. Connect to V for normal operation.
SS
TCLK
ORDERING INFORMATION
IIN1
IIP1
1
20 GND
Part Number
SA2007MPA
SA2007MSA
Package
DIP-20
IVP
2
19
IIN2
IIP2
3
18 DIRO
SOIC-20
ELT
17
4
VREF
MP1
MP0
VDD
SEL1
5
16
15
14
13
12
11
RATED
6
VSS
LED
MOP
NC
7
8
MON
TCLK
9
10
DR-01595
Figure 2: Pin connections: Package: DIP-20, SOIC-20
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PRELIMINARY
SA2007M
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FUNCTIONAL DESCRIPTION
ANALOG INPUT CONFIGURATION
The input circuitry of the current and voltage sensor inputs are
illustrated below.
The SA2007M is a CMOS mixed signal analog/digital
integrated circuit, which performs power/energy calculations
across a power range of 1000:1, to an overall accuracy of
better than Class 1.
These inputs are protected against electrostatic discharge
through clamping diodes.
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
SA2007M 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 SA2007M
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.
The feedback loops from the outputs of the amplifiers A and A
I
V
generate virtual shorts on the signal inputs. Exact duplications
of the input currents are generated for the analog signal
processingcircuitry.
ELECTROSTATIC DISCHARGE (ESD)
PROTECTION
The SA2007M integrated circuit's input's/outputs are protected
againstESD.
POWER CONSUMPTION
The power consumption rating of the SA2007M integrated
circuitislessthan30mW.
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 counter may be driven directly by connecting it
V
DD
between MOP and V .
SS
IIP
POWER CALCULATION
V
SS
CURRENT
In Figure 6, the voltage drops across the current transformers
terminating resistors are converted to currents for each current
sense input, by means of resistors R and R (channel 1) as
SENSOR
INPUTS
AI
V
DD
10
11
well as R and R
12
(channel 2). The current sense input
13.
IIN
saturates at an input current of ±25µA peak.
The mains voltage (230VAC) is divided down through a divider
V
SS
to 14V . The current into the A/D converter input is set at
RMS
V
DD
14µA at nominal mains voltage, via resistor R (1MW).
7
RMS
IVP
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.
VOLTAGE
SENSOR
INPUT
V
SS
A
V
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.
GND
DR-01288
Figure 3: Analog input internal configuration
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PRELIMINARY
SA2007M
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INPUT SIGNALS
OUTPUT SIGNALS
VREF
Motor output (MOP, MON)
A bias resistor of 24kW sets optimum bias and reference
conditions on chip. Calibration of the SA2007M should be
done on the voltage input as described in Typical Application.
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:
Motor pulse rate select (MP1 and MP0)
The pulse rate of the motor driver output of the SA2007M is
selected by the inputs MP1 and MP0. Three pulses rate
options are available as shown in the following table:
VDD
MOP
VSS
Pulse rate selection
VDD
Pulse Rate
Motor drive
Selection Input
MON
VSS
output
Unit
DR-01559
tm
tm
tm
selection
MP1
MP0
t = 142ms
m
V
V
1
pulses/kWh
pulses/kWh
pulses/kWh
SS
SS
Figure 4: Motor drive on MON and MOP pins
V
SS
V
DD
10
100
V
DD
V
SS
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:
V
DD
V
DD
Device test mode
Please note that the device will not perform metering functions
as described in this document while in test mode.
Rated condition select (RATED)
VDD
The rated condition select pin gives the option of having a 3:2:1
scaling ratio for the rated meter current. 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 230V40A. With the
rated condition select the SA2007M allow for the development
of different rated meters requiring minimal changes. The
following table below lists the option available (assuming the
rated condition to be 230V/60A).
LED
VSS
DR-01332
t
LED
Figure 5: LED pulse output
An integrated anti-creep function prevents any output pulses if
the measured power is less than 0.02% of the meters rated
current.
Selected input indicator (SEL1)
Rated condition select (RATED)
The SA2007M 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 Input RATED
Rated Conditions
V
SS
230V / 20A
230V / 40A
230V / 60A
OPEN
V
DD
Signal
Description
Value
Output
0
Channel 1 selected (IIN1/IIP1)
SEL 1
Channel 2 selected (IIN2/IIP2)
1
Switching between channels will not be faster than once per
second when both channels are balanced.
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PRELIMINARY
SA2007M
ssaammeess
Earth loop tamper indication (ELT)
If the power measurements from both current channels differ
by more than 12.5%, (indicating a earth loop tamper
condition), the ELT output is set to zero. The SA2007M
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 SA2007M provides information about the energy flow
direction of both current channels on pin DIRO .
A logic 1 on pin DIRO indicates reverse energy flow of both
current channels. 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 both current
sense input are in phase, is indicated on pin DIRO as a logic 0.
The DIRO output will toggle between 1 and 0 a rate of 1Hz
when one of the current channels measure positive energy
and the other negative energy. This condition may occur with a
improper installed or tampered meter.
The DIRO pin may be used to drive a LED in order to indicate
reverse energy.
Signal
Description
Value
Output
1
Reverse energy flow
DIRO
Forward energy flow
0
Out of phase current channels
1Hz
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PRELIMINARY
SA2007M
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TYPICAL APPLICATION
at approximately 17µA. At a nominal voltage current of 14µA
allows for 20% overdriving. The mains voltage is divided with a
voltage divider to 14V that is fed to the voltage input pins via a
1MW resistor.
The analog (metering) interface described in this section is
designed for measuring 230V/60A with precision better than
Class 1.
The most important external components for the SA2007M
integrated circuit are the current sense resistors, the voltage
sense resistors and the bias setting resistor. The resistors
used in the metering section should be of the same type so
temperature effects are minimized.
VoltageDivider
The voltage divider is calculated for a voltage drop of 14V.
Equationsforthevoltagedividerare:
RA=R1+R2+R3
RB=R7||(R5+P1)
Current Input IIN1, IIP1, IIN2, IIP2
Two current transformers are used to measure the current in
the live and neutral phases. The output of the current
transformer is terminated with a low impedance resistor. The
voltage drop across the termination resistor is converted to a
current that is fed to the differential current inputs of the
SA2007M.
A 5k trimpot will be used in the voltage channel for meter
calibration. The center position on the pot is used in the
calibrationP1=2.5kW.
Combiningthetwoequationsgives:
(RA+RB)/230V=RB/14V
Values for resistors R5 = 22kW, P1 = 2.5kW and R7 = 1MW is
chosen.
CT Termination Resistor
The voltage drop across the CT termination resistor at rated
current should be at least 20mV. The CTs have low phase shift
and a ratio of 1:2500. The CT is terminated with a 3.6W resistor
giving a voltage drop of 86.4mV across the termination resistor
Substitutingthevaluesresultin:
at rated conditions (I for the meter).
max
RB=23.9kW
RA=RBx(230V/14V–1)
RA = 369kW.
The termination resistor on the second current channel is
adjustable by means of P2 to facilitate channel equalization
calibration. The termination resistor is chosen so that a 10W
trimpot in parallel will provide a sufficient channel range.
Standard resistor values of R1, R2 and R3 are chosen to be
120kW, 120kW and130kW.
Current Sensor Input Resistors
The capacitor C1 is used to compensate for phase shift
between the voltage sense inputs and the current sense inputs
of the device, in cases where CTs with phase errors are used.
The phase shift caused by the CT may be corrected by
inserting a capacitor in the voltage divider circuit. To
compensate for a phase shift of 0.18 degrees the capacitor
valueiscalculatedasfollows:
The resistors R10, R11 and R12, R13 define the current level
into the current sense inputs of the SA2007M. The resistor
values are selected for an input current of 16µA on the current
inputs of the SA2007M at rated conditions. For a 60A meter at
2500:1 CT the resistor values are calculated as follows:
R10 = R11 = ( I / 16µA ) x R / 2
SH
L
=60A/2500/16µAx3.6W /2
= 2.7kW
C=1/(2x p xMainsfrequencyxR5xtan(Phaseshiftangle))
C=1/(2x p x50x1MW xtan(0.18degrees))
C=1.013µF
I =Linecurrent
L
RSH=CTTerminationresistor
2500=CTratio
ReferenceVoltageBiasresistor
R6 defines all on chip and reference currents. With R6 = 24kW
optimum conditions are set. Device calibration is done on the
voltageinputofthedevice.
The two current channels are identical so R10 = R11 = R12 =
R13.
VoltageInputIVP
The voltage input of the SA2007M (IVP) is driven with a current
of14µAatnominalmainsvoltage. Thevoltageinputsaturates
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PRELIMINARY
NEUTRAL
VDD
U1
Vin
3
1
Vout
LIVE
D1
D3
R4
L
R18
C2
T1
TZ1
GND
+C5
+
C6
p
s
R19
P1
D2
D4
C3
GND
R5
VSS
R1
R2
R3
VSS
14V
VDD
C1
LED2
LED3
LED1
LED4
CT2
R7
U2
IIN1
R8
R10
R14
R15
R16
R17
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
GND
R11
R12
R13
IIP1
IIN2
IIP2
IVP
DIRO
ELT
CT1
P2
R9
VREF
MP1
MP0
VDD
MON
SEL1
RATED
VSS
VDD
R6
VSS
LED
MOP
C4
10
TCLK
CNT1
LIVE
dr-01597
VSS
6 5 4 3 2 1 .1
NEUTRAL
SA2007M
ssaammeess
Parts List for Application Circuit: Figure 6
Symbol
Item
1
Detail
Description
DIP-20/SOIC-20
U2
D1
SA2007M
2
Diode, Silicon 1N4148
Diode, Silicon 1N4148
Diode, Silicon 1N4148
Diode, Silicon 1N4148
Light emitting diode, Amber
Light emitting diode, Green
Light emitting diode, Red
or Similar
or Similar
or Similar
or Similar
3
D2
4
D3
5
D4
6
LED1
LED2
LED3
LED4
R1
7
8
9
Light emitting diode, Green
Resistor, 120k, 1/4W, 1%, metal
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
R2
Resistor, 120k, 1/4W, 1%, metal
Resistor, 130k, 1/4W, 1%, metal
Resistor, 10W, 2W, Wire wound
Resistor, 24k, 1/4W, 1%, metal
Resistor, 22k, 1/4W, 1%, metal
Resistor, 1M, 1/4W, 1%, metal
Resistor, 1/4W, 1%, metal
R3
R4
R5
R6
R7
R8
Note 2
R9
Resistor, 1/4W, 1%, metal
Note 2
Note 1
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
P1
Resistor, 1/4W, 1%, metal
Note 1
Resistor, 1/4W, 1%, metal
Resistor, 1/4W, 1%, metal
Resistor, 1/4W, 1%, metal
Note 1
Note 1
Resistor, 1k, 1/4W, 5%
Resistor, 1k, 1/4W, 5%
Resistor, 1k, 1/4W, 5%
Resistor, 1k, 1/4W, 5%
Resistor, 1k, 1/4W, 5%, metal
Resistor, 1k, 1/4W, 5%, metal
Multi-turn, Trim pot, 10k
Multi-turn, Trim pot, 10W
Capacitor
Note 2
P2
Note 4
C1
Capacitor, 220nF
C2
Capacitor, 220nF
C3
Capacitor, 820nF
Note 3
C4
C5
Capacitor, 2200µF, 25V, electrolytic
C6
Capacitor, 100µF, 16V, electrolytic
Current Transformer
CT1
CT2
T1
Current Transformer
Transformer, 230V/9V
78LC05, Voltage regulator
Bipolar step motor
U1
CNT1
TZ1
400V, Metal oxide varistor
Note 1: Resistor (R10, R11, R12 and R13) values are dependent upon the selected value of R8 and R9
Note 2: See TYPICAL APPLICATION when selected the value of R8 and R9.
Note 3: Capacitor (C4) to be positioned as closed to Supply Pins (V & V ) of U-1, as possible.
SS
DD
Note 4: Capacitor (C1) selected to minimize phase error introduced by current transformer (typically 1.5µF for normal CTs)
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PRELIMINARY
SA2007P
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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:
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
DIVISION OF LABAT TECHNOLOGIES (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
P O BOX 15888
33 ELAND STREET
LYNN EAST 0039
REPUBLIC OF SOUTH AFRICA
REPUBLIC OF SOUTH AFRICA
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PRELIMINARY
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