Datasheet SA2005FPA, SA2005FSA Datasheet (SAMES)

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Three Phase Bidirectional Power/Energy Metering IC with Instantaneous Pulse Output

SA2005F

FEATURES

n Functionally compatible with the SA9105F with reduced

external components

n Performs bidirectional one, two or three phase power and

energy measurement

n Meets the IEC 521/1036 Specification requirements for

Class 1 AC Watt hour meters

DESCRIPTION

The SAMES SA2005F is an enhancement of the SA9105F. A precision oscillator and the loop capacitors are integrated on chip.

The SAMES SA2005F three phase bidirectional power/energy metering integrated circuit generates pulse rate outputs for positive and negative energy directions. The frequency of the pulses is proportional to the measured power consumption. The SA2005F performs active power calculation.

The method of calculation takes the power factor into account.

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n Operates over a wide temperature range n Uses current transformers for current sensing n Easily adaptable to different signal levels n Precision voltage reference on chip n Precision oscillator on chip. n Protected against ESD

Energy consumption is determined by integrating the power measurement over time.

This innovate universal three phase power/energy metering integrated circuit is ideally suited for applications such as residential and industrial energy metering and control.

The SA2005F integrated circuit is available in 20 pin dual-inline plastic (DIP-20), and 20 pin small outline (SOIC-20) package types.

IIN1 IIP1

IVN1

IIN2 IIP2

IVN2

IIN3 IIP3

IVN3

GND

Dr-01570

REF

VREF

VDD VSS

TIMING & CONTROL

TEST

Figure 1: Block Diagram

INTEGRATE

AND

AVERAGE

PGM0

POWER

PULSE

RATE

PGM1

OSC

TCLK

FOUT

DIR

SPEC-0042 (REV. 1)

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SA2005F

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ELECTRICAL CHARACTERISTICS

(V = 2.5V, V = -2.5V, over the temperature range -10°C to +70°C , unless otherwise specified.)

DD SS

Parameter

Operating temp. Range

Supply Voltage

Supply Current

Nonlinearity of Power Calculation

Symbol

V - V

DD SS

Min

-25

4.5

-0.3

Typ

Max

+85

5.5

+0.3

Current Sensor Inputs (Diffferential)

Input Current Range

-25

+25

Voltage Sensor Input (Asymmetrical)

Input Current Range

Pins FOUT, DIR Output Low Voltage Output High Voltage

Pulse Rate: FOUT

-25

V-1

0 0

+25

V+1

64 200

1160 3500

Pin PGM0, PGM1, TEST, TCLK High Voltage Low Voltage

V-1

V+1

Pin VREF Ref. Current Ref. Voltage

-I

1.1

1.3

Unit

°C

µA

V V

Hz Hz

V V

µA V

Output unloaded

1% - 100% of rated power

MODES 0, 1, 2 Specified linearity Min and Max limits

MODE 3 Specified linearity Min and Max Limits

With R = 24kW connected to V Referred to V

Condition

Peak value

I = 5mA

I = -2mA

ABSOLUTE MAXIMUM RATINGS*

Parameter Symbol Min Max Unit

Supply Voltage V -V -0.3 6.0 V

Current on any pin I -150 +150 mA

Storage Temperature T -40 +125 °C

Operating Temperature T -40 +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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STG

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SA2005F

PIN DESCRIPTION

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17, 20, 3

19, 18, 2, 1,

5, 4

7, 10

12, 13

Designation Description

GND

IVN1, IVN2, IVN3

IIN1, IIP1, IIN2, IIP2,

IIN3, IIP3

VREF

TCLK, TEST

FOUT

Analog Ground. The voltage to this pin should be mid-way between V and V .

Positive Supply voltage.

Negative Supply voltage.

The current into the A/D converter should be set at 14µA at nominal mains voltage. The voltage sense input saturates at an input current of ±25µA peak.

Inputs from current sensors. The shunt resistor voltage from each channel is converted to a current of 16µA at rated conditions. The current sense input saturates at an input current of ±25µA peak.

This pin provides the connection for the reference current setting resistor. A 24kW resistor connected to V sets the optimum operating condition.

Test inputs. For normal operation these pins must be connected to V .

Pulse rate output. The pulse frequency is proportional to the sum of the power measured on all three phases. The pulse format also indicates the direction of energy flow.

DIR

PGM0, PGM1

Direction output. This output indicates the direction of energy flow.

FOUT Pulse format Select. These inputs define the FOUT pulse width and format.

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RMS

1IIP2 IVN2

IIN2 IIN1

IVN3 IIP1

VDD

TEST

FOUT

IIP3

IIN3

6 15

DIR

DR-01571

IVN1

GND

VREF

VSS

PGM1

PGM0

NCTCLK

Figure 2: Pin connections: Package: DIP-20, SOIC-20

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ORDERING INFORMATION

Part Number

SA2005FPA

SA2005FSA

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Package

DIP-20

SOIC-20

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SA2005F

FUNCTIONAL DESCRIPTION

The SAMES SA2005F is a CMOS mixed signal integrated circuit, which performs three phase power/energy calculations over a range of 1000:1, to an overall accuracy of better than Class 1.

The SA2005F is functionally similar to the SA9105F. No external loop capacitors are required and an precision oscillator is integrated on chip.

The integrated circuit includes all the required functions for 3phase 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 SA2005F generates pulses with a frequency proportional to the power measured. The pulse rate follows the instantaneous power measured. The pulse frequency is proportional to the total sum of the three phases.

POWER CALCULATION

In the application circuit (figure 5), the mains voltages from V1, V2 and V3, are converted to currents and applied to the voltage sense inputs IVP1, IVP2 and IVP3.

The current levels on the voltage sense inputs are derived from the mains voltages (3 x 230VAC) being divided down to 14V through voltage dividers. The resulting input currents into the A/D converters are 14µA through the resistors R8, R9 and R10.

RMS

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through clamping diodes, in conjunction with the amplifiers input configuration. The feedback loops from the outputs of the amplifiers A and A generate virtual shorts on the signal inputs. Exact duplications of the input currents are generated for the analog processing circuitry.

Voltage Reference Connection (VREF)

A bias resistor of 24k provides an optimum bias conditions on chip. Calibration of the SA2005F should be done on the voltage inputs of the device as described in Typical Applications.

Current Sense Inputs (IIN1, IIP1, IIN2, IIP2, IIN3, IIP3)

At rated current the resistor values should be selected for input currents of 16µA . Referring to figure 5, the resistors R1 and R2 on current channel 1, resistors R3 and R4 on current channel 2 and resistors R5 and R6 on current channel 3, define the current level into the current sense inputs of the SA2005F. The current sense inputs saturates at an input current of ±25µA peak. Resistors R25, R26 and R27 are the current transformer termination resistors. The voltage drop across the termination resistors should be at least 20mV at rated conditions. Values for the current sense inputs are calculated as follows:

R = R = (I / 16µA ) x R / 2

1 2 L RMS 25

R = R = (I / 16µA ) x R / 2

3 4 L RMS 26

R = R = (I / 16µA ) x R / 2

5 6 L RMS 27

Where: I = Line current/CT-ratio

I V

RMS

For the current sense inputs the voltage drop across the current transformers terminating resistors are converted to currents of 16µA at rated conditions, by means of resistors

RMS

R1, R2 (Phase 1); R3, R4 (Phase 2) and R5, R6 (Phase 3). The signals providing the current information are applied to the current sensor inputs IIN1, IIP1, IIN2, IIP2 and IIN3, IIP3.

The output frequency of the SA2005F energy metering integrated circuit at rated conditions is 64Hz on FOUT (PGM0=0, PGM1=1).

One pulse (measured in Watt second) correspond to an energy measured of 3 x I x V / 64Hz.

RATED RATED

For a more detailed description see the Input Signals section.

INPUT SIGNALS

Analog Input Configuration

The current and voltage sensor inputs are illustrated in figure 3. These inputs are protected against electrostatic discharge

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IIP

IIN

IVP

GND

CURRENT SENSOR INPUTS

VOLTAGE SENSOR INPUT

DR-01288

Figure 3: Analog Input Internal Configuration

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SA2005F

Voltage Sense Inputs (IVN1, IVN2, IVN3)

The current into the voltage sense inputs (virtual ground) should be set to 14µA at rated voltage conditions. The individual mains voltages are divided down to 14V per phase. The resistors R8, R9 and R10 set the current for the voltage sense inputs. The voltage sense inputs saturate at an input current of ±25µA peak.

Pulse Programming Inputs (PGM0, PGM1)

The pulse programming inputs PGM1 and PGM0 define the representation of energy measured by the device on FOUT. The table below shows the difference between the various modes.

Mode

PGM1 PGM0

Test Inputs (TCLK, TEST)

The TEST and TCLK inputs are manufacturers test pins and must be connected to VSS in a metering application.

RMS

Frequency

at rated

conditions

64Hz

1160Hz

Forward

Pulse Width

1.14ms

71µs

RMS

Reverse

Pulse Width

3.4ms

1.14ms

71µs

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DIR as a logic 1. The DIR pin may be used to drive a LED in order to indicate reverse energy flow.

Frequency Output (FOUT)

The sum of the measured power, from the three phases produce a pulse rate of 64Hz or 1160Hz (mode 3), at rated conditions on FOUT. The format of the pulse output signal, which provides power/energy and direction information is shown in figure 4. Refer to Pulse Programming Inputs for pulse widths.

The following equation may be used for calculating the output frequency:

f = 11.16 x FOUTX x ((I x I )+(I x I )+(I x I )) / 3 x I Where: FOUTX = Nominal rated frequency (64Hz/1160Hz)

I , I , I = Input currents for current sensor inputs (16µA at rated

I1 I2 I3

line current) I , I , I = Input currents for voltage sensor inputs (14µA at

V1 V2 V3

rated line voltage) I = Reference current (typically 50µA)

An integrated anti-creep function ensures that no pulses are generated at zero line currents.

I1 V1 I2 V2 I3 V3 R

OUTPUT SIGNALS

Direction Indication (DIRO)

The SA2005F indicates the measured energy flow direction on

ELECTROSTATIC DISCHARGE (ESD) PROTECTION

The SA2005F integrated circuit's inputs/outputs are protected against ESD.

pin DIR. A logic 0 on pin DIR 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

POWER CONSUMPTION

The overall power consumption rating of the SA2005F integrated circuit is less than 50 mW with a 5V supply.

sense and current sense input are in phase, is indicated on pin

MODE 0 FOUT

MODE1 FOUT

MODE2 FOUT

MODE3 FOUT

DIR

DR-01582

Note: Frequency of pulse rate in MODE 3 is 18 times higher than other modes

Figure 4: FOUT options

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SA2005F

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TYPICAL APPLICATION

In figure 5, the components required for the three phase power/energy metering section of a meter, is shown. The application uses current transformers for current sensing. The 4-wire meter section is capable of measuring 3x230V/80A with precision better than Class 1.

The most important external components for the SA2005F 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 and reference currents. With R7=24kW, optimum conditions are set. Device calibration is done on the voltage inputs of the device.

CT TERMINATION RESISTOR

The voltage drop across the CT termination resistor at rated current should be at least 20mV. The CT’s used have low phase shift and a ratio of 1:2500.The CT is terminated with a

2.7W resistor giving a voltage drop across the termination resistor 864mV at rated conditions (Imax for the meter).

CURRENT SENSE RESISTORS

The resistors R1 and R2 define the current level into the current sense inputs of phase one of the device. The resistor values are selected for an input current of 16µA on the current inputs at rated conditions.

VOLTAGE DIVIDER

The voltage divider is calculated for a voltage drop of 14V. Equations for the voltage divider in figure 5 are:

RA = R16 + R19 + R22 RB = R8 || (R13+P1) Combining the two equations gives:

( RA + RB ) / 230V = RB / 14V

A 5k trimpot is used in each of voltage channel for meter calibration. The center position of the pot is used in the calculations. P1 = 2.5k and values for resistors R13 = 22k and R8 =1M is chosen.

Substituting the values result in: RB = 23.9k RA = RB x (230V / 14V - 1) RA = 368.9k.

Resistor values of R16, R19 and R22 is chosen to be 120k, 120k and 130k.

The three voltage channels are identical so R14= R15= R16 = R17 = R18 = R19 and R20 = R21= R22.

According to equation described in the Current Sense inputs section:

R1 = R2 = (I / 16µA ) x R / 2

I = Line current / CT Ratio

The three current channels are identical so R1 = R2 = R3 = R4 = R5 = R6.

LSH

= 80A /2500 / 16µA x 2.7W / 2 = 2.7kW

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SA2005F

NEUTRAL

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V3 In

V2 In

V1In

GND

Figure 5: Application Circuit

V3 Out

V2 Out

V1 Out

CT1

CT2

CT3

R14

R15

R16

GND

R25

R26

R27

VSS

R17

R18

R19

R20

R21

R22

IIN1

IIP1

IIN2

IIP2

IIN3

IIP3

VREF

VSS

SA2002F

GND

IVN1

IVN2

IVN3

DIR

FOUT

PGM1

PGM0

TCLK

TEST

VDD

Dr-01572

R12

R11

R13

GND

VDD

R10

GND

R23

R24

R28

R29

VDD

VSS

VDD

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VSS

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SA2005F

Parts List for Application Circuit: Figure 5

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Symbol

U1 R1 R2 R3

R4 R5 R6 R7 R8 R9 R10 R11 R12 R13

R14 R15

R16 R17 R18 R19 R20

R21 R22 R23 R24 R25 R26

R27 P1

C1 C2

C3 C4 C5

LED1

LED2 CT1

CT2

CT3

Description

SA2005F Resistor, 2.7k, 1/4W, 1% metal

Resistor, 2.7k, 1/4W, 1% metal Resistor, 2.7k, 1/4W, 1% metal

Resistor, 2.7k, 1/4W, 1% metal Resistor, 2.7k, 1/4W, 1% metal Resistor, 2.7k, 1/4W, 1% metal Resistor, 24k, 1/4W, 1%, metal

Resistor, 1M, 1/4W, 1%, metal Resistor, 1M, 1/4W, 1%, metal

Resistor, 1M, 1/4W, 1%, metal

Resistor, 22k, 1/4W, 1%, metal

Resistor, 120k, 1/4W, 1%, metal

Resistor, 120k, 1/4W, 1%, metal Resistor, 120k, 1/4W, 1%, metal Resistor, 120k, 1/4W, 1%, metal

Resistor, 130k, 1/4W, 1%, metal

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

Resistor, 2.7R, 1/4W, 1%, metal Resistor, 2.7R, 1/4W, 1%, metal Resistor, 2.7R, 1/4W, 1%, metal Trim pot, 5k, Multi turn Trim pot, 5k, Multi turn Trim pot, 5k, Multi turn

Capacitor, 220nF

Capacitor, 820nF

Capacitor, 820nF Capacitor, 820nF 3mm Light emitting diode 3mm Light emitting diode

Current Transformer, TZ76

Detail

DIP-20/SOIC-20 Note 1

Note 1 Note 1 Note 1

Note 1 Note 1

Note 1

Note 2

Note 2 Note 2 Note 3

Note 1: Resistor (R1 to R6) values are dependant on the selection of the termination resistors (R25 to R27) and CT combination. Note 2: Capacitor values may be selected to compensate for phase errors caused by the current transformers. Note 3: Capacitor C6 to be positioned as close as possible to supply pins V and V of U1 as possible.

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SA2005F

NOTES:

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PM9607AP

SA2005F

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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:

For the latest updates on datasheets, please visit our web site:

SOUTH AFRICAN MICRO-ELECTRONIC SYSTEMS

DIVISION OF LABAT TECHNOLOGIES (PTY) LTD

P O BOX 15888

33 ELAND STREET

LYNN EAST 0039

REPUBLIC OF SOUTH AFRICA

energy@sames.co.za

http://www.sames.co.za.

Tel : (012) 333-6021

Tel: Int +27 12 333-6021

Fax: (012) 333-8071

Fax: Int +27 12 333-8071

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Datasheet SA2005FPA, SA2005FSA Datasheet (SAMES)

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

DESCRIPTION

ELECTRICAL CHARACTERISTICS

PIN DESCRIPTION

ORDERING INFORMATION

FUNCTIONAL DESCRIPTION

TYPICAL APPLICATION