DESCRIPTION
The SAMES SA9105F Three Phase
bidirectional Power/Energy metering
integrated circuit generates pulse rate
outputs for positive and negative energy
directions, the frequency of which is
proportional to the power consumption.
The SA9105F 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.

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 SA9105F 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.

SA9105F

THREE PHASE BIDIRECTIONAL POWER/ENERGY

METERING IC WITH INSTANTANEOUS PULSE OUTPUT

Package: DIP-40

1 / 1 2

PIN CONNECTIONS

4366

PDS039-SA9105F-001

Rev. B

09-01-97

sames

FEATURES

Performs bidirectional 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

Two pulse output formats available

Protected against ESD

DR-00946

IIP3

COPP

CONP

OSC2

OSC1

TP18

TP17

CIPP

CINP

CIN1

CIP2

CIN2

CIN3

CIP3

IIN3

IIN1

IIP1

IIN2

IIP2

CON3

TP24

FOUT1

TP22

FOUT2

DIR

TP27

TP26

VREF

CIP1

GND

IVP1

IVP2

COP3

IVP3

COP1

CON1

CON2

COP2

SA9105F

sames

2/12

BLOCK DIAGRAM

PIN CONNECTIONS

Package: PLCC-44

N.C.

IVP3

DR-00947

IVP2

IVP1
GND

CON2

COP2

CON1

COP1

CIP1

TP27

V DD

N.C.
CON3
COP3

VREF

TP26

FOUT1

TP24

FOUT2

TP22

DIR

IIP2

CIP3

CIN1

CIP2

CIN2

CIN3

IIN1

IIP1

IIN2

OSC2

OSC1

TP18

TP17

CIPP

COPP

CONP

N.C.

IIN3

IIP3

CINP

TIMING & CONTROL

INTEG.

AVERAGE

G N D

DR-00948

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 2

DIR

SA9105F

sames

3/12

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

, unless otherwise specified.)

Parameter

Symbol

Min Typ

Max Unit Condition

Operating Temp. Range #

-25

+85

�C

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,DIR
Output Low Voltage

= 5mA

Output High Voltage

-1

= -2mA

Pulse Rate: FOUT1, FOUT2

Specified linearity

180

Min and max limits

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

Current at any pin

-100

+100

* 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.

SA9105F

sames

4/12

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

DIR

Direction indication output

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

TP27

Test pin. Connect to V

TP17

Manufacturer's test pins (Leave unconnected)

TP18

TP22

TP24

TP26

Designation Description

SA9105F

sames

6/12

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 SA9105F integrated circuit's inputs/outputs are protected against ESD.

Power Consumption
The overall power consumption rating of the SA9105F integrated circuit is less than
50mW with a 5V supply.

GND

DR-00949

VOLTAGE
SENSOR
INPUT

IVP

IIN

CURRENT
SENSOR
INPUTS

IIP

D D

V DD

SA9105F

sames

7/12

Pulse Output Signals
The calculated power is divided down to a pulse rate of 64Hz, for rated conditions
on both FOUT1 and FOUT2.
The format of the pulse output signal, which provides power/energy and direction
information, is the only difference between the signals on FOUT1 and FOUT2.
The direction of the energy flow is defined by the mark/space ratio on FOUT1, while
the pulse width defines the direction on FOUT2.

An integrated anticreep function ensures no metering at zero line currents.

DR-00950

Wave form on DIR

Positive Energy Flow

Wave form on FOUT1

Wave form on FOUT2

pp = 1.1ms

pn = 3.4ms

Negative Energy Flow

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 (64Hz)

FOSC

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

, I

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

, I

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

= Reference current (typically 50�A)

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 SA9105F integrated circuit are:

SA9105F

sames

8/12

, 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 SA9105F through current setting resistors (R

..R

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

�

RMS

into the SA9105F,

at the rated line current.

The values of these resistors should be calculated as follows:

Phase 1:

= R

= (I

/16

�

RMS

) * R

Phase 2:

= R

= (I

/16

�

RMS

) * R

Phase 3:

= R

= (I

/16

�

RMS

) * 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

�

RMS

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%).

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.

SA9105F

sames

9/12

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

2 5

2 1

2 2

2 3

2 4

3 1

2 8

2 6

2 9

2 7

3 0

3 7

3 6

3 5

3 3

3 4

3 2

3 9

3 8

4 0

V I 2 N

S A 9 1 0 5 F

D IP - 4 0

IC - 1

D R- 0 0 9 5 1

C 7

C 8

V I 3 P

V I 3 N

0 V

R 2 0

C 1 2

1 5

1 6

X T A L

1 9

1 8

2 0

1 7

R 1 2

1 0

R 1 3

1 4

1 3

1 2

1 1

C 6

C 5

F ROM CTs

V I 2 P

V I 1 N

V I 1 P

L IN E 3

R 1 9

R 1 8

0 V

M AI NS VOL TAGES

L IN E 2

L IN E 1

R 3

R 3 A

R 9

R 1 0

R 1 1

R 8

C 4

R 2

R 1

R 2 A

R 1 A

R 5

P 5

0 V

R 1 4

P 1 4

C 1 3

0 V

C 1 1

F OU T 1

D IR

F OU T 2

R 6

P 6

0 V

C 1 4

0 V

R 4

R 2 1

C 3

C 1

C 2

C 1 0

R 1 7

R 1 6

R 1 5

C 9

R 7

5 V

SA9105F

sames

10/12

Parts List for Application Circuit: Figure 1

Item

Symbol

Description

Detail

IC-1

SA9105FPA

DIP-40

XTAL

Crystal, 3.5795 MHz

Colour burst TV

Resistor, 200k, 1%, �W

R1A

Resistor, 180k, 1%, �W

Resistor, 200k, 1%, �W

R2A

Resistor, 180k, 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

SA9105F

sames

11/12

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 for DC blocking and 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

SA9105FPA

DIP-40

SA9105FFA

PLCC-44

SA9105F

sames

12/12

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 (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: SA9105F