Datasheet SA9105FFA, SA9105FPA Datasheet (SAMES)

sames

SA9105F

THREE PHASE BIDIRECTIONAL POWER/ENERGY

METERING IC WITH INST ANTANEOUS PULSE OUTPUT

FEATURES

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

n Operates over a wide temperature

range

n Uses current transformers for current

sensing

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.

n Excellent long term stability
n Easily adaptable to different signal

levels

n Precision voltage reference on-chip
n Two pulse output formats available
n Protected against ESD

PIN CONNECTIONS

CIN1
CIP2
CIN2
CIP3
CIN3
IIN1
IIP1

IIN2
IIP2

IIN3
IIP3

COPP
CONP
CIPP
CINP
V

SS

TP17
TP18
OSC1

OSC2

1
2
3
4
5
6
7
8
9

10

11
12
13

14
15
16
17
18
19
20

DR-00946

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21

CIP1
COP1
CON1
CON2
COP2
GND
IVP1

IVP2
IVP3
COP3
CON3

VREF
V

DD
TP27
TP26
DIR
TP24
FOUT2
TP22
FOUT1

Package: DIP-40

4366 PDS039-SA9105F-001 Rev. B 09-01-97

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SA9105F

PIN CONNECTIONS

BLOCK DIAGRAM

IVP1
IVP2

IVP3

IIP1
IIN1

IIP2
IIN2

IIP3
IIN3

GND

VREF

DIR

FOUT2

TP24

38

39

37 3536

40

TP26

41

TP27
V

42

DD

43

VREF

44

N.C.

1

CON3

2

COP3

3

IVP3

4

IVP2

5

IVP1

6

GND

7

109811

CON2

COP2

DR-00947

CON1

Package: PLCC-44

16 CONNECTIONS

FOR LOOPCAPS

ANALOG

SIGNAL

PRO-

AVERAGE

CESSING

REF

TIMING & CONTROL

TP22

N.C.

FOUT1

34

12

COP1

CIP1

N.C.

INTEG.

&

OSC2

OSC1

CIP2

CIN1

TP18

151413

CIN2

TP17

3033 32 31

16

CIP3

29

17

CIN3

V

SS

28

CINP

27

CIPP

26

CONP

25

COPP

24

N.C.

23

IIP3

22

IIN3

21

IIP2

20

IIN2

19

IIP1

18

IIN1

POWER

TO

PULSE

RATE

OSC

V

DD

V

SS

FOUT1

FOUT2

DIR

OSC1

OSC2

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DR-00948

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SA9105F

ABSOLUTE MAXIMUM RATINGS *

Parameter Symbol Min Max Unit

Supply Voltage VDD-V
Current on any Pin I
Storage Temperature T
Operating Temperature T
Current at any pin I

PIN

STG

O

P

SS

-0.3 6.0 V

-150 +150 mA

-40 +125 ° C

-40 +85 °C

-100 +100 mA

* 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.

ELECTRICAL CHARACTERISTICS

(Over the temperature range -10°C to +70°C#, unless otherwise specified.)

Parameter Symbol Min Typ Max Unit Condition

Operating Temp. Range # T

O

Supply Voltage VDD-V
Supply Current I

DD

-25 +85 °C

4.5 5.5 V

SS

10 mA

Nonlinearity of
Power Calculation -0.3 +0.3 % 1% - 100% of

rated power

Current Sensor Inputs (Differential)
Input Current Range I

II

-25 +25 µA Peak value
Voltage Sensor Inputs (Asymmetric)
Input Current Range I

IV

-25 +25 µA Peak value
Pins FOUT1,FOUT2,DIR

Output Low Voltage V
Output High Voltage V

Pulse Rate: FOUT1, FOUT2 f

OL
OH

p

VDD-1 V IOH = -2mA

0 64 Hz Specified linearity

VSS+1 V IOL = 5mA

0 180 Hz Min and max limits

Oscillator Recommended crystal:

TV colour burst crystal, f = 3.5795 MHz

Pin VREF With R = 24 kΩ

Ref. Current -I
Ref. Voltage V

#

Extended Operating Temperature Range available on request.

R

R

sames

45 50 55 µA connected to V

1.1 1.3 V Referred to V

SS

SS

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SA9105F

PIN DESCRIPTION

Pin Pin

PLCC DIP

6 35 GND Ground

42 28 V
29 16 V

5 34 IVP1 Analog input for Voltage : Phase 1
4 33 IVP2 Analog input for Voltage : Phase 2

3 32 IVP3 Analog input for Voltage : Phase 3
18 6 IIN1 Inputs for current sensor : Phase 1
19 7 IIP1
20 8 IIN2 Inputs for current sensor : Phase 2
21 9 IIP2
22 10 IIN3 Inputs for current sensor : Phase 3
23 11 IIP3
32 19 OSC1 Connections for crystal or ceramic resonator
33 20 OSC2 (OSC1 = Input ; OSC2 = Output)
35 21 FOUT1 Pulse rate outputs
37 23 FOUT2
39 25 DIR Direction indication output

9 38 CON1 Connections for outer loop capacitors of A/D
10 39 COP1 converters

8 37 CON2

7 36 COP2

1 30 CON3

2 31 COP3
26 13 CONP
25 12 COPP
13 1 CIN1 Connections for inner loop capacitors of A/D
11 40 CIP1 converters
15 3 CIN2
14 2 CIP2
17 5 CIN3
16 4 CIP3
28 15 CINP
27 14 CIPP
43 29 VREF Connection for current setting resistor
41 27 TP27 Test pin. Connect to V
30 17 TP17 Manufacturer's test pins (Leave unconnected)
31 18 TP18
36 22 TP22
38 24 TP24
40 26 TP26

Designation Description

DD

SS

Positive Supply Voltage
Negative Suply Voltage

SS

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SA9105F

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SA9105F

2. 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 AI and AV generate virtual

shorts on the signal inputs. Exact duplications of the input currents are generated
for the analog processing circuitry

V

DD

IIP

V

CURRENT
SENSOR
INPUTS

IIN

SS

V

DD

V

SS

V

DD

A

I

IVP

VOLTAGE
SENSOR
INPUT

DR-00949

V

SS

GND

A

V

3. Electrostatic Discharge (ESD) Protection

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

4. Power Consumption

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

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5. 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.

SA9105F

Positive Energy Flow

Negative Energy Flow

Wave form on FOUT1

Wave form on FOUT2

t

pp

mm

t

pp = 1.1ms

t

pp

mm

t

pn

mm

t

pn = 3.4ms

t

pn

mm

Wave form on DIR

DR-00950

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

The formula for calculating the Output Frequency (f) is given below:
f = 11.16

3.58MHz 3 * I

FOUTX

*

FOSC * (II1 IV1) + (II2 IV2) + (II3 IV3)

*

2

R

Where FOUTX = Nominal rated frequency (64Hz)

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

II1, II2, II3= Input currents for current sensor inputs (16µA at rated line current)
IV1, IV2, IV3= Input currents for voltage sensor inputs (14µA at rated line voltage)
I

R

= Reference current (typically 50µA)

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:

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SA9105F

C7, C9, C10 and C11 are the outer loop capacitors for the integrated oversampling
A/D converters. The typical value of C7 is 2.2nF and the value of C9, C10 and C11 is
560pF.

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

C4, C5, C6 and C8 are the inner loop capacitors for the integrated oversampling A/D
converters. The typical value of C4, C5, C6 and C8 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 (R8 ..R13).

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

into the SA9105F,

RMS

at the rated line current.
The values of these resistors should be calculated as follows:
Phase 1:
R8 = R9 = (IL1/16µA

) * R18/2

RMS

Phase 2:
R10 = R11 = (IL2/16µA

) * R19/2

RMS

Phase 3:
R12 = R13 = (IL3/16µA
Where I
R18, R19 and R

LX

20

) * R20/2

RMS

= Secondary CT current at rated conditions.
= Current transformer termination resistors for the three phases.

R1 + R1A, R4 and R15 set the current for the phase 1 voltage sense input. R2 + R2A, R5 +
P5 and R16 set the current for phase 2 and R3 + R3A, R6 + P6 and R17 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 14µA

for nominal line voltage. Capacitors C1, C2 and C3

RMS

are for decoupling and phase compensation.
R

+ P14 defines all on-chip bias and reference currents. With R14+ P14 = 24kΩ, optimum

14

conditions are set. R14 may be varied within ± 10% for calibration purposes. Any changes
to R

will affect the output quadratically (i.e: ∆R = +5%, ∆f = +10%).

14

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.

8/12

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SA9105F

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

M AI NS V OL TAGES

LINE 1
LINE 2

LINE 3

N

0V

FROM CTs

VI1P
VI1N
VI2P
VI2N
VI3P
VI3N

R18

R19

R20

0V

R1
R2

R3 R3A

C5

C6

R8
R9

R10
R11
R12

R13

C7

C8

XTAL

DR-00951

R1A

R2A

1
2
3
4
5
6
7

SA9105F

8

DIP-40

9

10

IC - 1

11
12
13
14
15
16
17
18
19
20

C4

C12

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21

R14

P14

C9

C10

R15
R16
R17

C11

C1

+

C2

+

C3

+

C13

0V

R6

P6

DIR
FOUT2

FOUT1
0V

R5

P5

R7

R4 R2 1

0V

5V

C14

0V

sames

0V

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SA9105F
Parts List for Application Circuit: Figure 1

Item Symbol Description Detail

1 IC-1 SA9105FPA DIP-40
2 XTAL Crystal, 3.5795 MHz Colour burst TV
3 R1 Resistor, 200k, 1%, ¼W
4 R1A Resistor, 180k, 1%, ¼W
5 R2 Resistor, 200k, 1%, ¼W
6 R2A Resistor, 180k, 1%, ¼W
7 R3 Resistor, 200k, 1% , ¼W
8 R3A Resistor, 180k, 1%, ¼W

9 R4 Resistor, 24k, 1%, ¼W
10 R5 Resistor, 22k, 1%, ¼W
11 R6 Resistor, 22k, 1%, ¼W
12 R7 Resistor, 820 Ω, 1%, ¼W
13 R8 Resistor Note 1
14 R9 Resistor Note 1
15 R10 Resistor Note 1
16 R11 Resistor Note 1
17 R12 Resistor Note 1
18 R13 Resistor Note 1
19 R14 Resistor, 22k, 1%, ¼W
20 R15 Resistor, 1M, 1%, ¼W
21 R16 Resistor, 1M, 1%, ¼W
22 R17 Resistor, 1M, 1%, ¼W
23 R18 Resistor Note 1
24 R19 Resistor Note 1
25 R20 Resistor Note 1
26 R21 Resistor, 820Ω, 1%, ¼W
27 P5 Potentiometer, 4.7k Multi turn
28 P6 Potentiometer, 4.7k Multi turn
29 P14 Potentiometer, 4.7k Multi turn
30 C1 Capacitor, electrolytic, 1µF, 16V Note 2
31 C2 Capacitor, electrolytic, 1µF, 16V Note 2
32 C3 Capacitor, electrolytic, 1µF, 16V Note 2
33 C4 Capacitor, 3.3nF
34 C5 Capacitor, 3.3nF
35 C6 Capacitor, 3.3nF
36 C7 Capacitor, 2.2nF
37 C8 Capacitor, 3.3nF
38 C9 Capacitor, 560pF
39 C10 Capacitor, 560pF
40 C11 Capacitor, 560pF

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SA9105F

Parts List for Application Circuit: Figure 1 (Continued)

Item Symbol Description Detail

41 C12 Capacitor, 820nF Note 3
42 C13 Capacitor, 100nF
43 C14 Capacitor, 100nF

Note 1: Resistor (R8, R9, R10, R11, R12 and R13) values are dependant upon the selected

values of the current transformer termination resistors R18, R19 and R20.

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 (VDD & VSS) of IC-1, as

possible.

ORDERING INFORMATION

Part Number Package

SA9105FPA DIP-40
SA9105FFA PLCC-44

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SA9105F

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:
[e-mail]

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: [phone] Tel: Int [phone]
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