SINGLE PHASE POWER/ENERGY METERING IC WITH
SELECTABLE PULSE RATE FOR MECHANICAL DISPLAY
APPLICATIONS
sames
1/16
SA9602M
7130
PDS039-SA9602M-001
REV. B
9-09-97
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
The SAMES SA9602M Single Phase
bidirectional Power/Energy metering inte-
grated 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
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 types.
PIN CONNECTIONS
Package:
DIP-20
SOIC-20
D R -0 1 3 2 8
7
MP 0
O S C 2
V
TE S T
D D
9
10
8
V R E F
IIP
IIN
R 1
R 0
MP 1
3
6
4
5
2
1
14
VS S
MO TO R
LE D
O S C 1
11
12
13
MP W
D IR O
D IR I
IV P
G N D
MD
18
15
16
17
19
20
SA9602M
2/16
sames
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Min
Max
Unit
Supply Voltage
V
DD
-V
SS
-0.3
6.0
V
Current on any pin
I
PIN
-150
+150
mA
Storage Temperature
T
STG
-40
+125
C
Operating Temperature
T
O
-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.
DIGITAL
SIGNAL
PRO-
CESSING
O S C I L L AT O R
OSC1
D R -01333
OSC2
DIRO
DIRI
ANALOG
SIGNAL
PRO-
CESSING
VDD
G N D
VREF
I I N
I I P
IVN
TEST
VSS
R1
R0
MPW
MD
PROG.
MOTOR
DRIVER
MP0 MP1
MOTOR
LED
SA9602M
sames
3/16
ELECTRICAL CHARACTERISTICS
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10C to +70C
#
, unless otherwise
specified.)
Parameter
Symbol
Min
Typ
Max
Unit
Condition
Operating temp. range
T
o
-25
+85
C
Supply Voltage: Positive
V
DD
2.25
2.75
V
Supply Voltage: Negative
V
SS
-2.75
-2.25
V
Supply Current: Positive
I
DD
5
6
mA
Supply Current: Negative
I
SS
5
6
mA
Current Sensor Inputs (Differential)
Input Current Range
I
II
-25
+25
A
Peak value
Voltage Sensor Input (Asymmetrical)
Input Current Range
I
IV
-25
+25
A
Peak value
Pin R0, R1,
Pull down
Input High Voltage
V
IH
V
DD
-1
V
Input Low Voltage
V
IL
V
SS
+1
V
Pin MP0, MP1
Pull down
Input High Voltage
V
IH
V
DD
-1
V
Input Low Voltage
V
IL
V
SS
+1
V
Pin MOTOR
Tri-state
V
OH
V
DD
-1
V
V
OL
V
SS
+1
V
Pin DIRO
Output High Voltage
V
OH
V
DD
-1
V
I
OH
= -2mA
Output Low Voltage
V
OL
V
SS
+1
V
I
OL
= 5mA
Pin DIRI
Pull up
Input High Voltage
V
IH
V
DD
-1
V
Input Low Voltage
V
IL
V
SS
+1
V
Pin LED
Output High Voltage
V
DH
V
DD
-1
V
I
OH
= -2mA
Output Low Voltage
V
OL
V
SS
+1
V
I
OL
= 5mA
SA9602M
4/16
sames
Pin Designation
Description
20
GND
Ground
8
V
DD
Positive Supply Voltage
14
V
SS
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
5
R0
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 V
SS
for
normal operation.
ELECTRICAL CHARACTERISTICS (Continued)
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10C to +70C
#
, unless otherwise
specified.)
Parameter
Symbol
Min
Typ
Max
Unit
Condition
Pin MD, MPW
Pull down
V
IH
V
DD
-1
V
V
IL
V
SS
+1
V
Pin VREF
With R = 24k
Ref. Current
-I
R
45
50
55 A connected to V
SS
Ref. Voltage
V
R
1.1
1.3 V Referred to V
SS
Oscillator
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
#
Extended Operating Temperature Range available on request.
PIN DESCRIPTION
SA9602M
sames
5/16
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
RMS
(0 to 80A through a shunt resistor of 200
). This voltage
is converted to a current of between 0 and 16A
RMS
, by means of resistors R
1
and
R
2
.
The current sense input saturates at an input current of 25A peak.
For the voltage sensor input, the mains voltage (230VAC) is divided down through
a divider to 14V
RMS
. The current into the A/D converter input is set at 14A
RMS
at
nominal mains voltage, via resistor R4 (1M
)
.
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 A
I
and A
V
generate virtual
shorts on the signal inputs. Exact duplications of the input currents are generated
for the analog signal processing circuitry.
PDF 
ZIP