SA9602M
SINGLE PHASE POWER/ENERGY METERING IC WITH
SELECTABLE PULSE RATE FOR MECHANICAL DISPLAY
APPLICATIONS
FEATURES
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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
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.
7130
n
sames
n
n
n
n
n
Total power consumption rating below
25mW
Adaptable to different types of current
sensors
Operates over a wide temperature range
Precision voltage reference on-chip
Selectable pulse rate
Scaling of rated conditions provides
ease of implementation for meter
manufactured.
PIN CONNECTIONS
IIN
IIP
1
2
20
G N D
19
18
17
16
15
IV P
D IR I
D IR O
MP W
VRE F
3
R1
R0
MP 1
MP 0
VD D
TE S T
4
5
6
7
8
9
MD
14
V S S
13
LE D
12
MO TO R
11
O S C 1
O S C 2
10
D R -0 1 3 2 8
Package:
DIP-20
SOIC-20
1/16
PDS039-SA9602M-001
REV. B
9-09-97
SA9602M
BLOCK DIAGRAM
VDD
VSS
TEST
R0
R1
MP0 MP1
IVN
ANALOG
GN D
DIGITAL
SIGNAL
SIGNAL
PRO-
CESSING
PROG.
MOTOR
DRIVER
LED
MOTOR
IIN
PRO-
IIP
VREF
CESSING
O S C I L L ATO R
D R -01333
OSC1
OSC2
DIRO
DIRI
MPW
MD
ABSOLUTE MAXIMUM RATINGS*
Parameter
Symbol
Supply Voltage
V
DD
-V
SS
Current on any pin
I
PIN
Storage Temperature
T
STG
Operating Temperature
T
O
Min
-0.3
-150
-40
-25
Max
6.0
+150
+125
+85
Unit
V
mA
°C
°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.
2/16
sames
SA9602M
ELECTRICAL CHARACTERISTICS
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10°C to +70°C
#
, unless otherwise
specified.)
Parameter
Operating temp. range
Supply Voltage: Positive
Supply Voltage: Negative
Supply Current: Positive
Supply Current: Negative
Symbol Min
T
o
V
DD
V
SS
I
DD
I
SS
-25
2.25
-2.75
5
5
Typ
Max
+85
2.75
-2.25
6
6
Unit Condition
°C
V
V
mA
mA
Current Sensor Inputs (Differential)
Input Current Range
I
II
-25
+25
µA
Peak value
Voltage Sensor Input (Asymmetrical)
Input Current Range
Pin R0, R1,
Input High Voltage
Input Low Voltage
Pin MP0, MP1
Input High Voltage
Input Low Voltage
Pin MOTOR
V
OH
V
OL
Pin DIRO
Output High Voltage
Output Low Voltage
Pin DIRI
Input High Voltage
Input Low Voltage
Pin LED
Output High Voltage
Output Low Voltage
sames
V
OH
V
OL
V
IH
V
IL
V
DH
V
OL
V
DD
-1
V
SS
+1
V
DD
-1
V
SS
+1
V
DD
-1
V
SS
+1
V
DD
-1
V
SS
+1
V
V
V
V
V
V
V
V
I
OH
= -2mA
I
OL
= 5mA
3/16
I
IV
V
IH
V
IL
V
IH
V
IL
-25
V
DD
-1
+25
µA
V
Peak value
Pull down
V
SS
+1
V
DD
-1
V
SS
+1
V
Pull down
V
V
Tri-state
I
OH
= -2mA
I
OL
= 5mA
Pull up
SA9602M
ELECTRICAL CHARACTERISTICS (Continued)
(V
DD
= 2.5V, V
SS
= -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
IH
V
DD
-1
V
V
IL
V
SS
+1 V
Pin VREF
Ref. Current
Ref. Voltage
Oscillator
#
-I
R
V
R
45
1.1
50
55
1.3
µA
V
With R = 24kΩ
connected to V
SS
Referred to V
SS
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
Extended Operating Temperature Range available on request.
PIN DESCRIPTION
Pin
20
8
14
19
1
2
3
11
10
12
13
4
5
6
7
18
17
16
15
9
4/16
Designation
GND
V
DD
V
SS
IVP
IIN
IIP
VREF
OSC1
OSC2
MOTOR
LED
R1
R0
MP1
MP0
DIRI
DIRO
MPW
MD
TEST
sames
Description
Ground
Positive Supply Voltage
Negative Supply Voltage
Analog input for Voltage
Inputs for current sensor
Connection for current setting resistor
Connections for crystal or ceramic resonator
(OSC1 = Input ; OSC2 = Output)
Pulse rate output
Pulse rate output
Rated conditions select
Motor pulse rate select
Direction input
Direction output
Motor pulse width select
Motor driver configuration select
Manufacturer test pin. Connect to V
SS
for
normal operation.
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
RMS
(0 to 80A through a shunt resistor of 200µΩ). This voltage
is converted to a current of between 0 and 16µA
RMS
, by means of resistors R
1
and
R
2
.
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
RMS
. The current into the A/D converter input is set at 14µA
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.
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.
2.
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