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SA9102F/SA9102H

FEATURES

Performs bidirectional power and
energy measurement

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

Protected against ESD

Power consumption rating typically
25mW

Adaptable to different types of current
sensors

Operates over a wide temperature
range

Precision voltage reference on-chip

Two output signal formats available

SINGLE PHASE BIDIRECTIONAL POWER/ENERGY

METERING IC WITH INSTANTANEOUS PULSE OUTPUT

4352

PDS039-SA9102F-001

REV. B

08-01-97

DESCRIPTION

The SAMES SA9102F and SA9102H Single
Phase bidirectional Power/Energy metering
integrated circuits generate pulse rate
outputs for positive and negative energy
directions, the frequency of which is
proportional to the power consumption.
These devices perform 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.

These innovative universal power/energy
metering integrated circuits are ideally suited
for energy calculations in applications such
as electricity dispensing systems (ED's),
residential municipal metering and factory
energy metering and control.

The SA9102F and SA9102H integrated
circuits are available in both 20 pin dual-in-
line plastic (DIP-20), as well as 20 pin small
outline (SOIC-20) package types.

PIN CONNECTIONS

Package: DIP-20

SOIC-20

DR-00906

O S C 2

TP9

D D

IIP

CPIP

CPIN

C P O P

C P O N

VREF

IIN

F O U T

DIR

O S C 1

IVP

C O N

C O P

CIP

CIN

G N D

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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

癈

Operating Temperature

-40

+85

癈

* 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.

BLOCK DIAGRAM

P O W E R

INTEG-

R A T O R

O S C

VOLTAGE

REF.

A N A L O G

SIGNAL

PROCE-

SSING

IVP

G N D

DR-00907

VREF

OSC1

IIP

IIN

OSC2

TIMING

POWER

FREQUENCY

FOUT

DIR

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ELECTRICAL CHARACTERISTICS
(V

= 2.5V, V

= -2.5V, over the temperature range -10癈 to +70癈

, unless otherwise

specified.)

Parameter

Symbol

Min

Typ

Max

Unit

Condition

Supply Voltage: Positive

2.25

2.75

Supply Voltage: Negative

-2.75

-2.25

Supply Current: Positive

Supply Current: Negative

Current Sensor Inputs (Differential)

Input Current Range

-25

+25

礎

Peak value

Voltage Sensor Input (Asymmetrical)

Input Current Range

-25

+25

礎

Peak value

Pins FOUT, DIR

Output Low Voltage

= 5mA

Output High Voltage

-1

= -2mA

Pulse Rate FOUT

Specified linearity

180

Min and max limits

Oscillator

Recommended crystal:
TV colour burst crystal f = 3.5795 MHz

Pin VREF

With R = 24k

Ref. Current

-I

礎

connected to V

Ref. Voltage

1.1

1.3

Referred to V

Extended Operating Temperature Range available on request.

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PIN DESCRIPTION

Pin

Designation

Description

GND

Ground

Positive Supply Voltage

Negative Supply Voltage

IVP

Analog input for Voltage

IIN

Inputs for current sensor

IIP

OSC1

Connections for crystal or ceramic resonator

OSC2

(OSC1 = Input ; OSC2 = Output)

FOUT

Pulse rate output

DIR

Direction indication output

CPON

Connections for outer loop capacitor of

CPOP

A/D converter (Voltage)

CPIN

Connections for inner loop capacitor of

CPIP

A/D converter (Voltage)

CIP

Connections for inner loop capacitor of

CIN

A/D converter (Current)

COP

Connections for outer loop capacitor of

CON

A/D converter (Current)

VREF

Connection for current setting resistor

TP9

Test Pin. Connect to V

FUNCTIONAL DESCRIPTION
The SA9102F/SA9102H are CMOS mixed signal Analog/Digital integrated circuits, which
perform bidirectional power/energy calculations across a power range of 1000:1, to an
overall accurancy of better than Class 1.

These integrated circuits includes all the required functions such as two 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.
These devices generate pulses, the frequency of which is proportional to the power
consumption. The pulse rate follows the instataneous power measured. Direction
information is also provided.

SA9102F/SA9102H

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Power calculation
In the Application Circuit (Figure 1), the voltage drop across the shunt will be
between 0 and 16mV (0 to 80A through a shunt resistor of 200�

). This voltage is

converted to a current of between 0 and 16礎, by means of resistors R

and R

The current sense input saturates at an input current of �25礎 peak.

For the voltage sensor input, the mains voltage (230VAC) is divided down through
a divider to 14V. The current into the A/D converter input is set at 14礎 at nominal
mains voltage, via resistor R4 (1M

In this configuration, with a mains voltage of 230V and a current of 80A, the output
frequency of the SA9102F and SA9102H power meter chips at FOUT (Pin 12) is
64Hz. In this case 1 pulse will correspond to an energy consumption of 18.4kW/
64Hz = 287.5Ws.

Analog Input configuration
The input circuitry of the current and voltage sensor inputs are illustrated below.

These inputs are protected against electrostatic discharge through clamping
diodes.

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 signal processing circuitry.

VOLTAGE
SENSOR
INPUT

DR-00908

IVP

CURRENT
SENSOR
INPUTS

IIP

IIN

GND

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Electrostatic Discharge (ESD) Protection
The SA9102F/SA9102H integrated circuits inputs/outputs are protected against
ESD.

Power Consumption
The power consumption rating of the SA9102F and SA9102H integrated circuits is
less than 30mW.

Pulse Output Signals
The calcualted power is divided down to a pulse rate of 64Hz, for rated conditions
on FOUT (Pin 12), for both the SA9102F and SA9102H.

The format of the pulse output signal, which provides power/energy and direction
information, is the only difference between the SA9102F and SA9102H devices.

The direction of the energy flow is defined by the mark/space ratio in the SA9102F,
while the pulse width defines the direction on the SA9102H.

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

DR-00909

m m

Positive Energy Flow

SA9102H

SA9102F

pp = 1.1ms

m m

pn = 3.4ms

Negative Energy Flow

Waveform on FOUT (Pin 12)

Waveform on DIR (Pin 13)

SA9102F/SA9102H

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The formula for calculating the output frequency (f) is given below:

11.16

* FOUTX *

FOSC

3.58MHz I

Where FOUTX

= Nominal rated frequency (64Hz)

FOSC

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

= Input currents for current inputs (16礎 at rated)

= Input currents for voltage inputs (14礎 at rated)

= Reference current (typically 50礎)

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

TYPICAL APPLICATIONS
In the Application Circuits (Figures 1 and 2), the components required for power metering
applications are shown.

In Figure 1 a shunt resistor is used for current sensing. In this application, the circuitry
requires a +2.5V, 0V, -2.5V DC supply.

In the case of Figure 2, when using a current transformer for current sensing, a +5V, 0V
DC supply is sufficient.

The most important external components for the SA9102F and SA9102H integrated
circuits are:

and C

are the outer loop capacitors for the two integrated oversampling A/D

converters. The value of these capacitors is 560pF.

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

and C

are the inner loop capacitors of the A/D converters. The optimum value is

3.3nF. The actual values are uncritical. Values smaller than 0.5nF and larger than 5nF
should be avoided.

, R

and RSH are the resistors defining the current level into the current sense input.

The values should be selected for an input current of 16礎 into the SA9102F/SA9102H
at maximum line current.

Values for RSH of less than 200�

should be avoided.

= R

= (I

/16礎) * R

Where

Line current

RSH

Shunt resistor/termination resistor

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, R

and R

set the current for the voltage sense input. The values should be selected

so that the input current into the voltage sense input (virtual ground) is set to 14礎.

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

= 24k

, optimum conditions

are set. R

may be varied within �10% for calibration purposes. Any change to R

will

affect the output quadratically (i.e.: R

= +5%, f

= +10%).

Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.

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Parts List for Application Circuit: Figure 1

Item

Symbol

Description

Detail

IC-1

SA9102F/SA9102H

DIP-20/SOIC-20

Diode, Silicon, 1N4148

ZD1

Diode, Zener, 2.4V, 200mW

ZD2

Diode, Zener, 2.4V, 200mW

XTAL

Crystal, 3.5795MHz

Colour burst TV

Resistor, 1% metal

Note 1

Resistor, 1% metal

Note 1

Resistor, 390k, (230VAC) 1%, metal

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

Resistor, 470

, 2W, 1%, carbon

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

Resistor, 680

, 1/4W, 1%

R10

Resistor, 680

, 1/4W, 1%

Capacitor, 560pF

Capacitor, 3.3nF

Capacitor, 100nF

C10

Capacitor, 100nF

C11

Capacitor, 0.47礔, 250VAC, polyester

C13

Capacitor, 100礔

C14

Capacitor, 100礔

C15

Capacitor, 820nF

Note 2

RSH

Shunt Resistor

Note 3

Note 1: Resistor (R1 and R2) values are dependant upon the selected value of RSH.

Note 2: Capacitor (C15) to be positioned as close to Supply Pins (V

& V

) of IC-1 as

possible.

Note 3: See TYPICAL APPLICATIONS when selecting the value of RSH.

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Parts List for Application Circuit: Figure 2

Item

Symbol

Description

Detail

IC-1

SA9102F/SA9102H

DIP-20/SOIC-20

XTAL

Crystal, 3.5795MHz

Colour burst TV

RSH

Resistor

Note 1

Resistor, 1%, metal

Note 2

Resistor, 1%, metal

Note 2

Resistor, 390k, (230VAC), 1%, metal

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

Resistor, 24k, 1/4W, metal

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

Resistor, 2.2k, 1/4W, 1%, metal

Capacitor, 560pF

Capacitor, 3.3nF

Capacitor, 820nF

Note 3

C10

Capacitor, 100nF

C11

Capacitor

Note 4

Current Transformer

Note 1:

See TYPICAL APPLICATIONS when selecting the value of RSH.

Note 2:

Resistor (R1and R2) values are dependant upon the selected value of
RSH.

Note 3:

Capacitor (C9) to be positioned as close to Supply Pins (V

& V

) of IC-1,

as possible.

Note 4:

Capacitor (C11) selected for DC blocking and to minimize phase error
introduced by current transformer (typically 1.5礔).

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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 out web site:
http://www.sames.co.za

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

33 Eland Street,

Lynn East, 0039

Koedoespoort Industrial Area,

Republic of South Africa,

Pretoria,

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.

协谢械泻褌褉芯薪薪褘泄 泻芯屑锌芯薪械薪褌: SA9102H

协谢械泻褌褉芯薪薪褘泄泻芯屑锌芯薪械薪褌: SA9102H