DESCRIPTION
The SAMES SA9105E Three Phase
unidirectional Power/Energy metering
integrated circuit generates a pulse rate
output, the frequency of which is proportional
to the power consumption. The SA9105E
performs the calculation for active power.

The method of calculation takes the power
factor into account.

Energy consumption is determined by the
power measurement being integrated over
time.

The output of this innovative universal three
phase power/energy metering integrated
circuit, is ideally suited for applications such
as residential and industrial energy metering
and control.

The SA9105E integrated circuit is available
in 40 pin dual-in-line plastic (DIP-40), as
well as in 44 pin plastic leaded chip carrier
(PLCC-44) package types.

SA9105E

THREE PHASE UNIDIRECTIONAL POWER/ENERGY

METERING IC WITH INSTANTANEOUS PULSE OUTPUT

Package: DIP-40

1 / 1 2

PIN CONNECTIONS

4262

PDS039-SA9105E-001

Rev. B

15-09-1995

sames

FEATURES

Performs unidirectional one, two or
three phase power and energy
measurement

Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters

Operates over a wide temperature
range

Uses current transformers for current
sensing

Excellent long term stability

Easily adaptable to different signal
levels

Precision voltage reference on-chip

Three pulse rate options available

Protected against ESD

DR-00838

IIP3

COPP

CONP

OSC2

OSC1

TP18

TP17

CIPP

CINP

CIN1

CIP2

CIN2

CIN3

CIP3

IIN3

IIN1

IIP1

IIN2

IIP2

CON3

TP25

TP24

FOUT3

FOUT2

FOUT1

TP27

TP26

VREF

CIP1

GND

IVP1

IVP2

COP3

IVP3

COP1

CON1

CON2

COP2

SA9105E

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BLOCK DIAGRAM

PIN CONNECTIONS

Package: PLCC-44

N.C.

1 2

3 4

N.C.

IVP3

DR-00840

IVP2
IVP1
GND

CON2

COP2

CON1

COP1

CIP1

1 0

1 1

TP27
V DD

N.C.
CON3
COP3

VREF

TP26

FOUT3

FOUT2

FOUT1

TP25

TP24

3 8

4 1

4 2

4 3

4 4

4 0

3 9

3 7

3 5

3 6

IIP2

2 1

1 6

CIP3

CIN1

CIP2

CIN2

1 5

1 4

1 3

CIN3

1 8

1 9

1 7

2 0

IIN1

IIP1

IIN2

OSC2

OSC1

TP18

TP17

3 0

3 3 3 2

3 1

2 7

2 2

2 4

2 5

2 6

2 3

2 8

2 9

CIPP

COPP

CONP

N.C.

IIN3

IIP3

CINP

TIMING & CONTROL

INTEG.

AVERAGE

G N D

DR-00839

V R E F

REF

IIN3

IIP2
IIN2

IIP1

IIN1

IVP3

IVP2

IVP1

IIP3

1 6 C O N N E C T I O N S

F O R L O O P C A P S

ANALOG

SIGNAL

PRO-

CESSING

OSC

O S C 1

O S C 2

S S

D D

POWER

PULSE

RATE

F O U T 1

F O U T 3

F O U T 2

SA9105E

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ELECTRICAL CHARACTERISTICS
(Over the temperature range -10�C to +70�C

, unless otherwise specified.)

Parameter

Symbol

Min Typ

Max Unit Condition

Supply Voltage

-V

4.5

5.5

Supply Current

Nonlinearity of
Power Calculation

-0.3

+0.3

1% - 100% of
rated power

Current Sensor Inputs (Differential)

Input Current Range

-25

+25

�

Peak value

Voltage Sensor Inputs (Asymmetric)

Input Current Range

-25

+25

�

Peak value

Pins FOUT1,FOUT2,FOUT3
Output Low Voltage

= 5mA

Output High Voltage

-1

= -2mA

Pulse Rate:

FOUT1

1160

Specified linearity

0.5

3000

Min and max limits

FOUT2

FOUT3

/290

Oscillator

Recommended crystal:
TV colour burst crystal, f = 3.5795 MHz

Pin VREF

With R = 24 k

Ref. Current

-I

�A

connected to V

Ref. Voltage

1.1

1.3

Referred to V

ABSOLUTE MAXIMUM RATINGS *

Parameter

Symbol

Min

Max

Unit

Supply Voltage

-V

-0.3

6.0

Current on any Pin

-150

+150

Storage Temperature

STG

-40

+125

�C

Operating Temperature

-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 conditions above those indicated in the operation sections of this
specification, is not implied. Exposure to Absolute Maximum Ratings for extended
periods may affect device reliability.

Extended Operating Temperature Range available on request.

SA9105E

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PIN DESCRIPTION

Pin

PLCC

DIP

GND

Ground

Positive Supply Voltage

Negative Suply Voltage

IVP1

Analog input for Voltage : Phase 1

IVP2

Analog input for Voltage : Phase 2

IVP3

Analog input for Voltage : Phase 3

IIN1

Inputs for current sensor : Phase 1

IIP1

IIN2

Inputs for current sensor : Phase 2

IIP2

IIN3

Inputs for current sensor : Phase 3

IIP3

OSC1

Connections for crystal or ceramic resonator

OSC2

(OSC1 = Input ; OSC2 = Output)

FOUT1

Pulse rate outputs

FOUT2

FOUT3

CON1

Connections for outer loop capacitors of A/D

COP1

converters

CON2

COP2

CON3

COP3

CONP

COPP

CIN1

Connections for inner loop capacitors of A/D

CIP1

converters

CIN2

CIP2

CIN3

CIP3

CINP

CIPP

VREF

Connection for current setting resistor

TP17

Manufacturer's test pins (Leave unconnected)

TP18

TP24

TP25

TP26

TP27

Designation Description

SA9105E

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PIN DESCRIPTION (Continued)

Pin

PLCC

DIP

Not connected

Designation Description

FUNCTIONAL DESCRIPTION
The SAMES SA9105E is a CMOS mixed signal Analog/Digital 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 integrated circuit includes all the required functions for 3-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 SA9105E generates pulses, the frequency of which is proportional to the power
consumption. Three frequency outputs (FOUT1, FOUT2 and FOUT3) are available. The
pulse rate follows the instantaneous power measured.

Power Calculation
In the Application Circuit (Figure 1), the mains voltages from Line 1, Line 2 and Line
3, 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 voltage
(3 x 230 VAC) being divided down through voltage dividers to 14V. The resulting
input currents into the A/D converters are 14

�

A through the resistors R

, R

and

For the current sense inputs the voltage drop across the current transformers
terminating resistors are converted to currents of 16

�

A for rated conditions, by

means of resistors R

, R

(Phase 1); R

, R

(Phase 2) and R

, R

(Phase 3).

The signals providing the current information are applied to the current sensor inputs
IIN1, IIP1; IIN2, IIP2 and IIN3, IIP3.

In this configuration, with the mains voltage of 3 x 230 V and rated currents of 80A,
the output frequency of the SA9105E energy metering integrated circuit at FOUT1
is 1.16kHz. In this case 1 pulse will correspond to an energy consumption of 3 x 18.4
kW/1160Hz = 47.6 Ws.

The output frequency at FOUT2 is FOUT1/4. At FOUT3 the output frequency is
FOUT1/290.

SA9105E

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Analog Input Configuration
The current and voltage sensor inputs are illustrated below.

These inputs are protected against electrostatic discharge 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

Electrostatic Discharge (ESD) Protection
The SA9105E integrated circuit's inputs/outputs are protected against ESD
according to Mil-Std 883 method 3015. The SA9105E integrated circuit's resistance
to transients is also dependant upon the external protection components used.

Power Consumption
The overall power consumption rating of the SA9105E integrated circuit is less than
75mW with a 5V supply.

GND

D D

DR-00524

VOLTAGE
SENSOR
INPUT

IVP

IIN

CURRENT
SENSOR
INPUTS

IIP

D D

VDD

SA9105E

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TYPICAL APPLICATION
In the Application Circuit (Figure 1), the components required for a three phase power
metering application are shown. Terminated current transformers are used for current
sensing.

The most important external components for the SA9105E integrated circuit are:

, C

and C

are the outer loop capacitors for the integrated oversampling

A/D converters. The typical value of C

is 2.2nF and the value of C

, C

and C

560pF.

The actual values determine the signal to noise and stability performance. The tolerances
should be within � 10%.

, C

and C

are the inner loop capacitors for the integrated oversampling A/D

converters. The typical value of C

, C

and C

is 3.3nF. Values smaller than 0.5nF

and larger than 5nF should be avoided.

Terminated current sensors (current transformers) are connected to the current sensor
inputs of the SA9105E through current setting resistors (R

..R

The resistor values should be selected for an input current of 16

�

A into the SA9105E, at

the rated line current.

The values of these resistors should be calculated as follows:

Phase 1:

= R

= (I

/16

�

A) * R

Phase 2:

= R

= (I

/16

�

A) * R

Phase 3:

= R

= (I

/16

�

A) * R

Where I

Secondary CT current at rated conditions.

, R

and R

Current transformer termination resistors for the three phases.

+ R

, R

and R

set the current for the phase 1 voltage sense input. R

+ R

, R

and R

set the current for phase 2 and R

+ R

, R

+ P

and R

set the current for phase

3. The values should be selected so that the input currents into the voltage sense inputs
(virtual ground) are set to 14

�

A for nominal line voltage. Capacitors C1, C2 and C3 are

for decoupling and phase compensation.

+ P

defines all on-chip bias and reference currents. With R

+ P

= 24k

, optimum

conditions are set. R

may be varied within � 10% for calibration purposes. Any changes

to R

will affect the output quadratically (i.e:

= +5%,

f = +10%).

SA9105E

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The formula for calculating the Output Frequency (f) is given below:

11.16

* FOUTX *

FOSC

) + (I

)

3.58MHz 3 * I

Where FOUTX

= Nominal rated frequency (4Hz, 290Hz or 1160Hz)

FOSC

= Oscillator frequency (2MHz ...... 4MHz)

, I

= Input currents for current inputs (16�A at rated)

, I

= Input currents for voltage inputs (14�A at rated)

= Reference current (typically 50�A)

XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator
frequency is divided down to 1.7897 MHz on-chip, to supply the digital circuitry and the
A/D converters.

Figure 1: Application Circuit for Three Phase Power/Energy Measurement.

SA9105A

DIP-40

IC-1

2 . 5 V

VI3N

0 V

2 . 5 V

DR-00233

C 1 2

X T A L

R 1 3

C 7

C 8

FROM CTs

VI2P

VI1N

VI1P

VI2N

VI3P

R 2 0

R 1 9

R 1 8

0 V

MAINS VOLTAGES

LINE 3

LINE 2

LINE 1

C 6

R 9

R 1 0

R 1 1

R 1 2

R 8

C 5

C 4

R 3

R 2

R 1

R 3 A

R 2 A

R 1 A

C 1 4

R14

P14

0 V

C 1 1

0 V

FOUT3

FOUT2

FOUT1

C 1 3

5 V

P 6

0 V

P 5

0 V

R 1 7

R 1 6

R 1 5

C 1 0

C 9

R 6

C 3

C 1

C 2

R 7

R 5

R 4

R 2 1

2 . 5 V

5 V

SA9105E

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Parts List for Application Circuit: Figure 1

Item

Symbol

Description

Detail

IC-1

Integrated SA9105E

DIP-40/PLCC-44

XTAL

Crystal, 3.5795 MHz

Colour burst TV

Resistor, 200k, 1%, �W

R1A

Resistor, 180k, 1%, �W

Resistor, 200k, 1%, �W

R2A

Resistor, 200k, 1%, �W

Resistor, 200k, 1% , �W

R3A

Resistor, 180k, 1%, �W

Resistor, 24k, 1%, �W

Resistor, 22k, 1%, �W

Resistor, 820

, 1%, �W

Resistor

Note 1

Resistor

Note 1

R10

Resistor

Note 1

R11

Resistor

Note 1

R12

Resistor

Note 1

R13

Resistor

Note 1

R14

Resistor, 22k, 1%, �W

R15

Resistor, 1M, 1%, �W

R16

Resistor, 1M, 1%, �W

R17

Resistor, 1M, 1%, �W

R18

Resistor

Note 1

R19

Resistor

Note 1

R20

Resistor

Note 1

R21

Resistor, 820

, 1%, �W

Potentiometer, 4.7k

Multi turn

Potentiometer, 4.7k

Multi turn

P14

Potentiometer, 4.7k

Multi turn

Capacitor, electrolytic, 1�F, 16V

Note 2

Capacitor, electrolytic, 1�F, 16V

Note 2

Capacitor, electrolytic, 1�F, 16V

Note 2

Capacitor, 3.3nF

Capacitor, 2.2nF

Capacitor, 3.3nF

Capacitor, 560pF

C10

Capacitor, 560pF

C11

Capacitor, 560pF

SA9105E

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Parts List for Application Circuit: Figure 1 (Continued)

Item

Symbol

Description

Detail

C12

Capacitor, 820nF

Note 3

C13

Capacitor, 100nF

C14

Capacitor, 100nF

Note 1: Resistor (R

, R

and R

) values are dependant upon the selected

values of the current transformer termination resistors R

, R

and R

Note 2: Capacitor values may be selected to compensate for phase errors caused by the

current transformers.

Note 3: Capacitor (C12) to be positioned as close to Supply Pins (V

& V

) of IC-1, as

possible.

ORDERING INFORMATION

Part Number

Package

SA9105EPA

DIP-40

SA9105EFA

PLCC-44

SA9105E

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South African Micro-Electronic Systems (Pty) Ltd
P O Box 15888,

33 Eland Street,

Lynn East,

Koedoespoort Industrial Area,

0039

Pretoria,

Republic of South Africa,

Republic of South Africa

Tel:

012 333-6021

Tel:

Int +27 12 333-6021

Fax:

012 333-8071

Fax:

Int +27 12 333-8071

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.

Электронный компонент: SA9105E