SA2007MPA_技术文档

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

1/10

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

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 -1

DD

I

= -2mA

OH

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 -1

DD

IH

V +1

SS

IL

Pin RATED

V = V

I

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

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

+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.

2/10

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PRELIMINARY

SA2007M

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PIN DESCRIPTION

Designation

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

3/10

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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

A_I

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

t_m

selection

MP1

MP0

t = 142ms

m

V

1

pulses/kWh

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.

5/10

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SA2007M

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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

6/10

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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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SA2007M

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Parts List for Application Circuit: Figure 6

Symbol

Item

1

Detail

Description

DIP-20/SOIC-20

U2

D1

SA2007M

2

Diode, Silicon 1N4148

Light emitting diode, Amber

Light emitting diode, Green

Light emitting diode, Red

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

Note 1

Resistor, 1k, 1/4W, 5%

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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PSMA29060077PAP

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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

10/10

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PRELIMINARY


型号：	SA2007MPA
厂家：	SAMES
描述：	Single Phase Power/Energy Metering IC with Tamper Detection 单相功率/电能计量IC，具有篡改检测
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

SA2007MPA [SAMES]

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