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FEATURES

Performs bidirectional energy metering
and includes a 7 digit LCD driver with
announciators

4 externally selectable on-chip tariff reg-
isters

An additional total energy register

Meets the accuracy requirements for
Class 1 AC Watt hour meters

Optical interface for electronic reading

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according to IEC1107 Mode D

Pulse output for calibration

Total power consumption rating below
100mW

Uses current transformers for current
sensing

Operates over a wide temperature range

Demonstration software included

MONOCHIP THREE PHASE BIDIRECTIONAL

KILOWATT HOUR METERING MODULE

PM9110BFX

PDS038-SA9110A-001

REV. 2

28-06-00

SA9110A APPLICATION NOTE

PM9110BF

DESCRIPTION

The SAMES monochip three phase bidirectional kilowatt hour metering module, the

PM9110BF, provides all the required metering functions including energy measure-
ment, a 7 digit LCD driver, a tariff selection facility, an optical port as well as a pulse
output for calibration purposes.

Energy consumption is determined by the power measurement being integrated over

time.

This method of calculation takes the power factor into account.
This application utilises the SAMES SA9110AFA monochip three phase bidirectional

kilowatt hour metering IC for energy measurement.

PM9110BF

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BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS*

Parameter

Symbol

Min

Max

Unit

Supply Voltage (Note 1)

540

Storage Temperature

STG

-25

+125

癈

Operating Temperature

-10

+70 (Note 2)

癈

Note 1:

Voltages are specified with reference to Neutral

Note 2:

The SA9110A integrated circuit is specified to operate over the temperature
range -10癈 to +70癈. The module functionality will, however, depend upon
the external components used.

*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 operational sections of this
specification, is not implied. Exposure to Absolute Maximum Ratings for extended
periods may affect device reliability.

SA9110A

5V POWER

SUPPLY

DR-01103

LOAD

DISPLAY

EXTERNAL

POWER SUPPLY

BATTERY

BACKUP

OPTICAL

PORT

PDTA

PGM

PCLK

SCROLL

RESET

TARIF

SELECT

ISOLATED

CALIBRATION

INTERFACE

PULSE

OUTPUT

PM9110BF

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ELECTRICAL CHARACTERISTICS
(Over the temperature range -10癈 to +70癈, unless otherwise specified. Power
consumption figures are applicable to the PM9110BFE only.)

Parameter

Symbol Min

Typ Max

Unit

Condition

Supply Voltage (x3 Phase)

180

230

265

PM9110BFE

(Continuous)
Power Consumption

100

m W

From external
power supply

Isolation Voltage

2500

Continuous

Opto-coupler Output
Current

= 1V

Opto-coupler Input
Current

Note 1: Isolation voltage may be specified, depending on customer requirements.

PIN DESCRIPTION

Designation

Description

SK1

Isolated programming interface

5-Pin

Header

connector

SK2

Isolated pulse output

2-Pin

Header

connector

MAINS

Voltage Supply Connected to Phase 1

Voltage Supply Connected to Phase 2
Voltage Supply Connected to Phase 3
Voltage Supply Connected to Neutral Line (common)

CT1

Phase 1 (Orientation indicated on PCB)

CT2

Phase 2 (Orientation indicated on PCB)

CT3

Phase 3 (Orientation indicated on PCB)

POWER

5V DC Supply Voltage
0V DC Supply Voltage

PM9110BF

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FUNCTIONAL DESCRIPTION
1.

Energy Calculation
This Application Note should be read in conjunction with the SA9110A Data Sheet.
In the Application Circuit (see Figure 2), the output current from the current sensors
will be between 0 and 16礎

RMS

. The current input stage of the module saturates at

input currents greater than18礎

RMS

. The mains voltage (Voltage + 15% - 20%) is

used to perform the energy calculation, together with the current information from
the current sensor (current transformers).
The SA9110AFA integrated circuit may be adjusted to accomodate any voltage or
current values. The method for calculating external component values is described
in section 9 (Circuit Description).
The accumulated energy is directly displayed on a 7 digit LCD. This unique
application offers a host of additional features, which are dealt with below.

Electrostatic Discharge (ESD) Protection
The device's inputs/outputs are protected against ESD. The modules resistance to
transients will be dependant upon the protection components used.

Power Consumption
The overall power consumption rating for this power metering application (Figure
2), is under 100mW, excluding the current sensors.

Isolation
The programming interface and pulse output are isolated from the module which
is at mains potential, via opto-couplers.

Isolated Programming Interface
This isolated interface is provided to allow the user to programme the tariff register
values, calibration constants and manufacturer/meter identification codes. This
port is enabled by inserting the jumpers J8, J9 and J10. The programming may be
performed via the parallel port of a personal computer.

The designation of the pins on connector SK1 are given below:

PM9110BF

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PM9110BF

PC Parallel Connectors (Suggested)

Pin

Description

Pin

Description

GND

PCLK

PDTA

PGM

Note: The recommended connections above are applicable for the demonstration
software provided with the PM9110BF.

Optical Port
The optical port has been designed to meet the IEC1107 Mode D specification. This
facillity offers a pulse output as well as a serial data meter reading facility.
Three types of interfacing elements from the PM9110BF are available:
a) Infra-red optical port
b) Red LED
c) Opto-coupler
In order to maximise the intensity of the element, it is suggested that only one of
the outputs be used at any one time.

Jumper

Element

Opto Coupler

Infra Red LED

Red LED

Liquid Crystal Display (LCD)
The PM9110BF has a LCD comprising of seven digits with announciatiors.
To cater for compatibility with future devices four jumpers are provided for
backplane driving configurations. The PM9110BF boards are shipped to the
customer with jumpers in a default configuration.

Tariff, Scroll and Reset Functions
Tariff Selection
A dual DIP switch provides the user with the facility to set the active tariff register
in which consumption will be accumulated.
The active register is indicated on the LCD.

PM9110BF

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The most important external components 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

is 560pF.

The actual values determine 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 SA9110A through current setting resistors (R

..R

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

RMS

into the

SA9110A at the rated line current.

Scroll Facility
The 4 registers may be sequentially displayed by activating the scroll button. The
contents of the register selected for display is retained on the display for a period
of 10 seconds, provided that the push button is not activated during this period. After
the 10 seconds has elapsed, the display defaults to the "active" register defined by
the status of the tariff DIP switches.
The register selected for display via the scroll button is indicated by the relevant
announciatiors.

Reset Function
By pressing the Reset button the contents of the RAM of the SA9110A device is set
to the default conditions.
Jumpers J8, J9 and J10 must be removed to use this feature.
It is strongly recommended that the provision of this facility is not made available
on production meters.

Circuit Description
The module is supplied from an external 5V DC supply.

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The values of these resistors should be calculated as follows:

Phase 1:

= R

= (I

/16mA) * R

Phase 2:
R

= R

= (I

/16mA) * R

Phase 3:
R

= R

= (I

/16mA) * R

Where I

Secondary CT current at rated conditions.

, R

and R

Termination resistors of the three current transformers.

+ R

, R

and R

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

+ R

+ P

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 14mA

RMS

for rated line voltage. Capacitors

C1, C2 and C3 are for decoupling and phase compensation.
R

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

= 24k

, optimum

conditions are set. Any changes to R

will affect the output quadratically (i.e:

= +5%,

f = +10%).

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

10. Demonstration Software

Serial communication with the SA9110A device is identical to the communication
found on the Single Phase family member, SA9109A. For this reason the
demonstration software for the Single Phase Application circuit is used for the Three
Phase Application.

The software package which accompanies the demonstration unit requires an IBM
or compatible PC with MS-DOS installed. This software, supplied on a 1.44M 3�"
disk, will allow the user to read and write settings from/to the demonstration unit.

Ensure that the communication connectors are in place prior to start.

Insert the diskette into the drive and at the DOS prompt, type

A:SA9109

[enter]

Context sensitive help screen for each input field or command prompt are available
by invoking [alt] H or [F1] key.

An introduction is available by pressing the [F1] key immediately after installation.

PM9110BF

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Figure 2: Application Circuit.

SA9110AFA

R18

R
8

AGND

DR-01105

R23

POWER

C12

C16

C15

C14

C13

BAT.

CT3

CT1

CT2

R22

VBA

CON1

CIP1

CIN1

COP1

SSV

VREF

GND

R21

R13

R20

R12

R19

R10

R11

IIN3

IIP3

IIN2

IIP1

IIP2

IIN1

MAINS

R1A

R3A

R2A

R1B

R2B

R3B

V SS

R17

R16

R15

IVP3

PCLK

PGM

PDTA

IVP2

IVP1

RESET

J10

R29

R28

R27

1
3

S[7]

Total

COP2

CON3

CON2

CIP2

CIN2

COP3

CIN3

C11

C10

C
5

CIP3

CINP

CIPP

CONP

COPP

R[2]

OSCO

COFF

R[0]

R[1]

OSCI

I C - 1

R[3]

S[0]

S[1]

S[2]

S[3]

S[4]

S[5]

S[6]

XTAL

4
3

9
8
7

6
5

15
14

17
16

T3 COM

T4 COST

T2 TOTAL

T1 COST

68
62

SD0

S[9]

S[8]

SR[0]

NC10

NC13

NC24

NC26

NC44

NC9

SR[1]

NC61

NC11

S[10]

S[11]

S[12]

S[13]

XXXXXXX

SCROLL

TAR

RED_LED

IR_LED

SK1

SK2

R26

R25

R24

.
.

27
28
29
30

.
.

Hz 321

Wh/imp

kWsh

22
23

.
.

rro

imp/kWh

LCD

PM9110BF

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Parts List for Application circuit: Figure 2

Item Symbol

Description

Detail

SA9110AFA

PLCC-68

ILQ74 (Quad opto-coupler)

DIP-16

4N35 (opto-coupler)

DIP-6

XTAL

Crystal 3.5795MHz

Colour burst TV

R1A

Resistor, 1%, 糤, metal

Note 4

R1B

Resistor, 1%, 糤, metal

Note 4

R2A

Resistor, 1%, 糤, metal

Note 4

R2B

Resistor, 1%, 糤, metal

Note 4

R3A

Resistor, 1%, 糤, metal

Note 4

R3B

Resistor, 1%, 糤, metal

Note 4

Resistor, 24k, 1%, 糤, metal

Resistor, 22k, 1%, 糤, metal

Resistor, 24k, 1%, 糤, metal

Resistor, 2.7k, 1%, 糤, metal

Note 1

Resistor, 2.7k, 1%, 糤, metal

Note 1

R10

Resistor, 2.7k, 1%, 糤, metal

Note 1

R11

Resistor, 2.7k, 1%, 糤, metal

Note 1

R12

Resistor, 2.7k, 1%, 糤, metal

Note 1

R13

Resistor, 2.7k, 1%, 糤, metal

Note 1

R15

Resistor, 1M, 1%, 糤, metal

R16

Resistor, 1M, 1%, 糤, metal

R17

Resistor, 1M, 1%, 糤, metal

R18

Resistor, 2.7

, 1%, 糤, metal

Note 1

R19

Resistor, 2.7

, 1%, 糤, metal

Note 1

R20

Resistor, 2.7

, 1%, 糤, metal

Note 1

R21

Resistor, 820

, 1%, 糤, metal

R22

Resistor, 820

, 1%, 糤, metal

R23

Resistor, 2M

, 1%, 糤, metal

R24

Resistor, 680

, 1%, 糤, metal

R25

Resistor, 2.2k

, 1%, 糤, metal

R26

Resistor, 2.2k

, 1%, 糤, metal

R27

Resistor, 2.2k

, 1%, 糤, metal

R28

Resistor, 2.2k

, 1%, 糤, metal

R29

Resistor, 2.2k

, 1%, 糤, metal

Potentiometer, 4.7k

Multi turn

Potentiometer, 4.7k

Multi turn

Capacitor, electrolytic, 1礔, 16V

Note 2

Capacitor, electrolytic, 1礔, 16V

Note 2

Capacitor, electrolytic, 1礔, 16V

Note 2

Capacitor, ceramic, 3.3nF

PM9110BF

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Parts List for Application circuit: Figure 2 (continued)

Item Symbol

Description

Detail

Capacitor, ceramic, 2.2nF

Capacitor, ceramic, 3.3nF

Capacitor, ceramic, 560pF

C10

Capacitor, ceramic, 560pF

C11

Capacitor, ceramic, 560pF

C12

Capacitor, 100礔, 16V

C13

Capacitor, 100nF

Note 3

C14

Capacitor, 100nF

Note 3

C15

Capacitor, 100礔, 16V

C16

Capacitor, 820nF

BAT

Battery, 1.2V

IR LED

Infrared light emitting diode

56 RED LED Red light emitting diode
57

Photo transistor

Diode, 1N4148

SCROLL NO, push button

RESET

NO, push button

TARIFF

DIP switch, 2 pole

LCD

OEL-7678*

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 (C13) to be positioned as close to Supply Pins (V

& V

) of IC-1, as

possible

Note 4: See the table below detailing the component values for the selected voltage

standard

*The LCD display is available from:
JEBON CORPORATION
Unit 709, Poongsan Factoria Town,
1141-2, Baegsok-Dong, Ilsan-District,
Koyangcity, Kyonggi-Do, 411-360, Korea
Tel: +82-31-902-9161 (12 lines)
Fax: +82-31-902-7775/7776

Web site: http://www.jebon.com

PM9110BF

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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: PM9110BFE

协谢械泻褌褉芯薪薪褘泄泻芯屑锌芯薪械薪褌: PM9110BFE