Datasheet SA9602MPA, SA9602MSA Datasheet (SAMES)

sames

D R-01328

MP 0

OSC2

V

TEST

DD

10

VREF

IIP

IINR1R0

MP 1

14

VSSMOTOR

LE D

OSC1

111213

MP W

DIRO

DIRI

IV P

GND

MD

1815161719

20

SA9602M

SINGLE PHASE POWER/ENERGY METERING IC WITH

SELECT ABLE PULSE RATE FOR MECHANICAL DISPLA Y

APPLICA TIONS

FEATURES

n Provides ease of interface to systems

employing a mechanical counter

n Performs bidirectional power and

energy measurement

n Meets the IEC 521/1036 Specification

requirements for Class 1 AC Watt hour
meters

n Protected against ESD
n Allows selection of motor driver

configuration

n Total power consumption rating below

25mW

n Adaptable to different types of current

sensors

n Operates over a wide temperature range
n Precision voltage reference on-chip
n Selectable pulse rate
n Scaling of rated conditions provides

ease of implementation for meter
manufactured.

DESCRIPTION

PIN CONNECTIONS

The SAMES SA9602M Single Phase
bidirectional Power/Energy metering inte­grated circuit generates a pulse rate output,
the frequency of which is proportional to
the power consumption. The SA9602M
performs the calculation for active power.

The method of calculation takes the power
factor into account.

Energy consumption can be determined by
counting output pulses. The pulse rate for
a particular application is selected according
to the status of inputs MP0 and MP1.

This innovative universal single phase

1
2
3
4
5
6
7
8
9

power/energy metering integrated circuit is
ideally suited for energy calculations in
applications utilizing a mechanical display.

The SA9602M integrated circuit is available
in 20 pin dual-in-line plastic (DIP-20), as
well as 20 pin small outline (SOIC-20)

Package: DIP-20

SOIC-20

package types.

7130 PDS039-SA9602M-001 REV. B 9-09-97

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SA9602M

DIGITAL

SIGNAL

PRO-

CESSING

OSC1

OSC2

DIRO

TEST

VSSR1R0

MD

PROG.

MOTOR

DRIVER

MP0

BLOCK DIAGRAM

MP1

MOTOR

LED

MPW

IVN

GND

IIN

IIP

VREF

D R - 01333

VDD

ANALOG

SIGNAL

PRO-

CESSING

OSCILLATOR

DIRI

ABSOLUTE MAXIMUM RATINGS*

Parameter Symbol Min Max Unit

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

PIN

STG

O

SS

-0.3 6.0 V

-150 +150 mA

-40 +125 °C

-25 +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 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.

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SA9602M

ELECTRICAL CHARACTERISTICS

(VDD = 2.5V, VSS = -2.5V, over the temperature range -10°C to +70°C#, unless otherwise
specified.)

Parameter Symbol Min Typ Max Unit Condition

Operating temp. range T
Supply Voltage: Positive V
Supply Voltage: Negative V
Supply Current: Positive I
Supply Current: Negative I

DD

SS

DD

SS

-25 +85 °C

o

2.25 2.75 V

-2.75 -2.25 V
56mA
56mA

Current Sensor Inputs (Differential)
Input Current Range I

-25 +25 µA Peak value

II

Voltage Sensor Input (Asymmetrical)
Input Current Range I

IV

-25 +25 µA Peak value

Pin R0, R1, Pull down
Input High Voltage V

Input Low Voltage V

VDD-1 V

IH

IL

VSS+1 V

Pin MP0, MP1 Pull down
Input High Voltage V
Input Low Voltage V

VDD-1 V

IH
IL

VSS+1 V

Pin MOTOR Tri-state

V
V

VDD-1 V

OH

OL

VSS+1 V

Pin DIRO
Output High Voltage V
Output Low Voltage V

VDD-1 V IOH = -2mA

OH

OL

VSS+1 V IOL = 5mA

Pin DIRI Pull up
Input High Voltage V
Input Low Voltage V

VDD-1 V

IH

IL

VSS+1 V

Pin LED
Output High Voltage V
Output Low Voltage V

VDD-1 V IOH = -2mA

DH

OL

VSS+1 V IOL = 5mA

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SA9602M

ELECTRICAL CHARACTERISTICS (Continued)

(VDD = 2.5V, VSS = -2.5V, over the temperature range -10°C to +70°C#, unless otherwise
specified.)

Parameter Symbol Min Typ Max Unit Condition

Pin MD, MPW Pull down

V
V

VDD-1 V

IH
IL

VSS+1 V

Pin VREF With R = 24kΩ

Ref. Current -I
Ref. Voltage V

R
R

45 50 55 µA connected to V

1.1 1.3 V Referred to V

SS

SS

Oscillator Recommended crystal:

TV colour burst crystal f = 3.5795 MHz

#

Extended Operating Temperature Range available on request.

PIN DESCRIPTION

Pin Designation Description

20 GND Ground
8 V

14 V

DD

SS

Positive Supply Voltage

Negative Supply Voltage
19 IVP Analog input for Voltage
1 IIN Inputs for current sensor
2 IIP

3 VREF Connection for current setting resistor

11 OSC1 Connections for crystal or ceramic resonator

10 OSC2 (OSC1 = Input ; OSC2 = Output)

12 MOTOR Pulse rate output
13 LED Pulse rate output

4 R1 Rated conditions select
5R0
6 MP1 Motor pulse rate select

7 MP0
18 DIRI Direction input

17 DIRO Direction output
16 MPW Motor pulse width select
15 MD Motor driver configuration select

9 TEST Manufacturer test pin. Connect to VSS for

normal operation.

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SA9602M

FUNCTIONAL DESCRIPTION

The SA9602M is a CMOS mixed signal Analog/Digital integrated circuit, which performs
power/energy calculations across a power range of 1000:1, to an overall accurancy of
better than Class 1.

The integrated circuit includes all the required functions for 1-phase power and energy
measurement 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. The SA9602M generates pulses, the
frequency of which is proportional to the power consumption. Two frequency outputs
(MOTOR and LED) are available. The pulse rate follows the instantaneous power
consumption measured.

The motor drive pin can be configured as a unipolar or bipolar output using input MD. This
choice allows the manufacturer to use either an impulse counter (unipolar) or stepper
motor (bipolar).

1. Power Calculation

In the Application Circuit (Figure 1), the voltage drop across the shunt will be
between 0 and 16mV
is converted to a current of between 0 and 16µA

(0 to 80A through a shunt resistor of 200µΩ). This voltage

RMS

, by means of resistors R1 and

RMS

R2.
The current sense input saturates at an input current of ±25µA 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 14µA

RMS

RMS

at

nominal mains voltage, via resistor R4 (1MΩ).
Different pulse rates are available at the motor drive pin. The device may be

programmed for a 1 pulse/kWh, 10 pulses/kWh or 100 pulses/kWh output,
depending on the status of the motor pulse rate select pins MPD and MP1.

The LED pulse rate is fixed at 1000 pulses/kWh. The frequency of the motor drive
and LED pin is dependant on the settings of R0 and R1 which allow selection of
different rated conditions. Rated conditions such as 230V/40A, 230V/60A, 230V/
80A and 230V/100A may be chosen. This facility allows meter manufacturers to
cater for a wide range of metering applications with minimal design changes.

2. 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 AI and AV generate virtual

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

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SA9602M

IIP

CURRENT
SENSOR
INPUTS

IIN

IVP

V

DD

V

SS

V

DD

V

SS

V

DD

A

I

VOLTAGE
SENSOR
INPUT

DR-01288

V

SS

GND

A

V

3. Electrostatic Discharge (ESD) Protection

The SA9602M integrated circuit's inputs/outputs are protected against ESD.

4. Power Consumption

The power consumption rating of the SA9602M integrated circuit is less than
30mW.

5. Output Signals

The motor drive output pulse is defined by the status of the MD input pin: MD=0 for
unipolar; and MD=1 for bipolar. Note that the LED output pulses at a high frequency
(1160Hz at rated conditions, irrespective of the R0, R1 inputs) when MD=0, this
mode is very usefull for fast callibration during manufacturing. The wave forms for
the two types of output driving methods are show below:

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sames

MOTOR DRIVE WAVEFORM

V

ss

DR-01331

DD

BIPOL AR MD=1

t

ss

V

DD

tmtmt

m

t

MO TO R

SA9602M

V

t

MO TO R

UNIPOLA R MD=0

Z

V

m

The pulse width for tm is selected by the status of the motor pulse width input pin,
MPW. The two possible options are shown in the following table.

MOTOR PULSE WIDTH, MPW

Signal

t

m

Motor pulse width input, MPW

0

1

37 71.4 ms

Unit

Note that wide pulses (MPW = 1) are not allowed with a high pulse rate specified
by R1 = 1. The pulse rate of the motor driver ouput of the S9602M is selected by
the inputs MP1 and MP0. Four pulse rate options are available as shown in tabular
form below.

PULSE RATE SELECTION

Pulse Rate Selection Input

MP1

0
0
1
1

MP0

0
1
0
1

sames

Motor drive output

selection

1

10

100

1000

Unit

Wh/pulse
Wh/pulse
Wh/pulse
Wh/pulse

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SA9602M

LED

dr-01332

V

V

t

LED

The pulse rate of the LED output is fixed at 1000 pulses/kWh when MD = 1. This
high rate of pulses is preferred for such tasks as calibration, verification and
monitoring of consumption rate. The LED waveform is as shown below:

LED PULSE OUTPUT

DD

SS

LED PULSE WIDTH

Signal

Motor driver configuration, MD

0 1

t

LED

71.4µs 10ms

6. Direction, Indication and Selection

The SA9602M provides information on the energy flow direction on pin DIRO.
A logic 0 on pin DIRO indicates reverse energy flow. Reverse energy flow is defined

as the condition where the voltage sense input and current sense input are out of
phase.

Positive energy flow, when voltage sense and current sense input are in phase, is
indicated on pin DIRO a logic 1.

The DIRO pin may be used to drive a LED in order to indicate reverse energy.

DIRECTION INDICATION

Signal Output

Value Description

0

Reverse energy flow

DIRO

1

Forward energy flow

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SA9602M

The SA9602M allows selection of the form of energy to be measured: forward
energy, reverse energy, or bidirectional energy. Selection is achieved by means of
the DIRI input. A table of possible settings for DIRI is shown below:

DIRECTION SELECTION

Signal Input DIRI

0

Description

Motor pulses only for

Condition

reverse energy

1

Motor pulses only for

Default pull up input

forward energy

DIRO

Motor pulse for
bidirectional energy

DIRO connected to
DIRI

7. Rated Condition Select

The user selectable output frequencies for the MOTOR output and LED pulse rate
will allow a meter manufacturer to build meters for a 5-4-3-2 scaling ratio of rated
current.

The table below shows the various options which can be selected using pins R0 and
R1.

RATED CONDITION SELECT

MD

R1

Rated Conditions

R0

LED Output (1000
pulses/kWh)

0

1

0

1

1

1

1

1

0

230V / 40A

1

230V / 60A

0

230V / 80A

1

230V / 100A

2.55Hz

3.83Hz

5.11Hz

6.39Hz

Scaling of the frequency for the MOTOR drive output pulses takes effect in the
same manner as shown for the LED output pulse rate.

This feature is particularly useful in circumstances where a manufacturer requires
a meter for use in a system rated for two different conditions, for exampe 230V/80A
and 230V/40A. Previously such a requirement would have necessitated alteration
of both the input current sensing resistors and the output measuring/counting block.

With the rated condition select, using R0 and R1, the SA9602M allows for the
development of different rated meters requiring minimal changes.

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SA9602M

For example, a meter manufacturer may wish to build
(a) Meter rated for 230V/80A, 1000 pulses/kWh
(b) Meter rated for 230V/40A, 1000 pulses/kWh
If the LED output pulse rate is considered, then

(a) 230V/80A, R1=1 and R0=0

The table of Rated Condition Select shows that for this case the frequency for the
LED output at rated conditions is 5.11Hz.

Hence,
1 pulse = = 3600 Ws

(b) 230V/40A, R1=0 and R0=0

The table of Rated Condition Select shows that in this case the frequency for the
LED output at rated conditions in 2.55Hz

Hence,
1 pulse = = 3600 Ws

VI 230 x 80
f

p

VI 230 x 40
f

p

5.11

2.55

˜

˜

As the examples shows, the SA9602M can be configured easily for use in meters
for different rated systems. The only changes which must be implemented are:
selection of current sense resistors for the expected rated load current; and
selection of settings for R0 and R1.

10/16

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SA9602M

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 SA9602M integrated circuit are:
R2, R1 and RSH are the resistors defining the current level into the current sense input.

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

into the SA9602M at

RMS

maximum line current.
Values for RSH of less than 200µΩ should be avoided.
R1 = R2 = (IL/16µA
Where I

L

) * RSH/2

RMS

= Line current

RSH = Shunt resistor/termination resistor

R3, R6 and R4 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 14µA

RMS

R7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum conditions
are set. R7 may be varied within ±10% for calibration purposes. Any change to R7 will
affect the output quadratically (i.e.: R7 = +5%, fP = +10%).

The formula for calculating the output frequency is given below:
f = 11.16

LED

FOUTX

3.58MHz I

*

FOSC * II .I

*

V

2

R

Where FOUTX = Frequency for selected rated condition

.

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

I

I

I

V

I

R

= Input current for current input (16µA
= Input current for voltage input (14µA

RMS

RMS

= Reference current (typically 50µA)

at rated)

at rated)

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.

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11/16

SA9602M

RSH

Figure 1: Application Circuit see

specification for details.

PLANE

GROUN D

R6

R4R4

20

1

R1

R2

19

2

DIRECTION

R11

18

3

D3

17

4

16

5

15

IC -1

6

Specifications:

Shunt resistor for current sensing.
Rated conditions 230V/80A.
Bidirectional metering.
Motor step of 1Wh/pulse.
Bipolar Motor.
37ms Motor pulses.

11

10

M

C10

XTAL

C15

C9

R7

R12

PULSE

D4

14

13

789

12

DR -01329

ZD1

ZD2

12/16

R9

C13

D1

R3

C11

R5

LOAD

R10

C14

D2

SU PPLY

sames

Parts List for Application Circuit: Figure 1

Item Symbol Description Detail

1 IC-1 SA9602M DIP-20/SOIC-20

2 D1 Diode, Silicon, 1N4148

3 D2 Diode, Silicon, 1N4148

4 ZD1 Diode, Zener, 2.4V, 200mW

5 ZD2 Diode, Zener, 2.4V, 200mW

6 D3 Light emitting diode

7 D4 Light emitting diode

8 XTAL Crystal, 3.5795MHz Colour burst TV

9 R1 Resistor, 1% metal Note 1

10 R2 Resistor, 1% metal Note 1
11 R3 Resistor, 390k, (230VAC) 1%, metal
12 R4 Resistor, 1M, 1/4W, 1%, metal
13 R5 Resistor, 470Ω, 2W, 5%, carbon
14 R6 Resistor, 24k, 1/4W, 1%, metal
15 R7 Resistor, 24k, 1/4W, 1%, metal
16 R9 Resistor, 680 Ω, 1/4W, 1%
17 R10 Resistor, 680Ω, 1/4W, 1%
18 R11 Resistor, 1k, 1/4W, 5% carbon
19 R12 Resistor, 1k, 1/4W, 5% carbon
20 C9 Capacitor, 100nF Note 4
21 C10 Capacitor, 100nF Note 4
22 C11 Capacitor, 0.47µF, 250VAC, polyester
23 C13 Capacitor, 100µF
24 C14 Capacitor, 100µF
25 C15 Capacitor, 820nF Note 2
26 RSH Shunt Resistor Note 8

SA9602M

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 (VDD & VSS) of IC-1 as

possible.
Note 3: See TYPICAL APPLICATIONS when selecting the value of RSH.
Note 4: Additional Capacitors may be required depending on the change needed to step

the motor.

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13/16

SA9602M

Figure 2: Application circuit see

specification for details.

R6

C11

R4

20

1

19

2

18

3

Specification

Current transformer for current sensing
Rated conditions 230V/40A
Unidirectional metering phase reversal

indication
Motor step at 10 steps/kWh
Impulse counter
Motor step at wide pulses.

S

R10

D3

DIRECTIO N

17

4

16

5

15

IC -1

6

14

7

13

8

12

9

11

XTAL

C9

10

LOAD

14/16

R3

CT

RSH

sames

R2

R7

5V

R8

C10

R9

2.5V DC

DR-01330

L

SUPPLY

N

Parts List for Application Circuit: Figure 2

Item Symbol Description Detail

1 IC-1 SA9602M DIP-20/SOIC-20
2 XTAL Crystal, 3.5795MHz Colour burst TV
3 RSH Resistor Note 1
4 R1 Resistor, 1%, metal Note 2
5 R2 Resistor, 1%, metal Note 2
6 R3 Resistor, 390k, (230VAC), 1%, metal
7 R4 Resistor, 1M, 1/4W, 1%, metal
8 R6 Resistor, 24k, 1/4W, metal

9 R7 Resistor, 24k, 1/4W, 1%, metal
10 R8 Resistor, 2.2k, 1/4W, 1%, metal
11 R10 Resistor 1K, 1/4W, 5% carbon
12 R9 Resistor, 2.2k, 1/4W, 1%, metal
13 C9 Capacitor, 820nF Note 3
14 C10 Capacitor, 100nF
15 C11 Capacitor Note 4
16 CT Current transformer
17 D1 Light emitting diode

SA9602M

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 (VDD & VSS) of IC-1,

as possible.

Note 4: Capacitor (C11) selected to minimize phase error introduced by current

transformer (typically 1.5µF).

ORDERING INFORMATION

Part Number Package

SA9602MPA DIP-20
SA9602MSA SOIC-20

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SA9602M

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 adress 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, 0039 Koedoespoort Industrial Area,
Republic of South Africa, Pretoria,

Republic of South Africa

Tel: [phone] Tel: Int [phone]
Fax: [phone] Fax: Int [phone]

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