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FEATURES
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SA9103C
SINGLE PHASE BIDIRECTIONAL POWER/ENERGY
METERING IC WITH SERIAL INTERFACE
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Performs bidirectional active and
reactive power/energy, frequency and
voltage measurement
Meets the IEC 521/1036 Specification
requirements for Class 1 AC Watt hour
meters
Protected against ESD
Total power consumption rating below
25mW
Adaptable to different current sensor
technologies
Operates over a wide temperature
range
Serial interface having a RS232 protocol
Precision voltage reference on-chip
Tri-state output to allow parallel
connection of devices
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DESCRIPTION
The SAMES SA9103C bidirectional Single
Phase Power/Energy metering integrated
circuit has a serial interface with a RS232
protocol, ideal for use with a µ-Controller.
The SA9103C performs the calculation for
active and reactive power.
The integrated values for active and
reactive energy as well as the mains
frequency and voltage information are
accessable through the RS232-Interface
as 16 bit values.
This innovative universal single phase
power/energy metering integrated circuit
is ideally suited for energy calculations in
applications such as electricity dispensing
systems (ED's), residential municipal
metering and factory energy metering and
control.
The SA9103C integrated circuit is available
in both 20 pin dual-in-line plastic (DIP-20),
as well as 20 pin small outline (SOIC-20)
package types.
4259
PIN CONNECTIONS
IIN
IIP
VREF
CPON
CPOP
CPIN
CPIP
V DD
TP9
OSC2
1
2
3
4
5
6
7
8
9
10
DR-00829
20
19
18
17
16
15
14
13
12
11
GND
IVP
CON
COP
CIN
CIP
V SS
SIN
SOUT
OSC1
Package: DIP-20
SOIC-20
1/16
PDS039-SA9103C-001
REV. D
23-08-1996
SA9103C
BLOCK DIAGRAM
V DD
V SS
IIP
IIN
ACTIVE
ENERGY
SIN
SOUT
ANALOG
SIGNAL
PROCE-
SSING
REACTIVE
ENERGY
SERIAL
FREQUENCY
INTERFACE
VOLTAGE
VOLTAGE
REF.
IVP
GND
OSC
TIMING
DR-00830
VREF
OSC1
OSC2
ABSOLUTE MAXIMUM RATINGS*
Parameter
Supply Voltage
Current on any pin
Storage Temperature
Operating Temperature
Symbol
V
DD
-V
SS
I
PIN
T
STG
T
O
Min
-0.3
-150
-40
-10
Max
6.0
+150
+125
+70
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.
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SA9103C
ELECTRICAL CHARACTERISTICS
(V
DD
= 2.5V, V
SS
= -2.5V, over the temperature range -10°C to +70°C
#
, unless otherwise
specified.)
Parameter
Supply Voltage: Positive
Supply Voltage: Negative
Supply Current: Positive
Supply Current: Negative
Symbol Min
V
DD
V
SS
I
DD
I
SS
2.25
-2.75
5
5
Typ
Max
2.75
-2.25
6
6
Unit Condition
V
V
mA
mA
Current Sensor Inputs (Differential)
Input Current Range
I
II
-25
+25
µA
Peak value
Voltage Sensor Input (Asymetrical)
Input Current Range
Pin SOUT
Output Low Voltage
Output High Voltage
Pin SIN
Input High Voltage
Input Low Voltage
Pull-up Current
Oscillator
Pin VREF
Ref. Current
Ref. Voltage
#
I
IV
V
OL
V
OH
V
IH
V
IL
-I
I
-25
+25
V
SS
+1
µA
V
V
V
V
µA
Peak value
I
OL
= 5mA
I
OH
= -2mA
V
DD
-1
V
DD
-1
50
V
SS
+1
150
V
IN
= V
SS
Recommended crystal:
TV colour burst crystal f = 3.5795 MHz
-I
R
V
R
45
1.1
50
55
1.3
µA
V
With R = 24kΩ
connected to V
SS
Referred to V
SS
Extended Operating Temperature Range available on request.
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SA9103C
PIN DESCRIPTION
Pin
20
8
14
19
1
2
11
10
12
13
4
5
6
7
15
16
17
18
3
9
Designation
GND
V
DD
V
SS
IVP
IIN
IIP
OSC1
OSC2
SOUT
SIN
CPON
CPOP
CPIN
CPIP
CIP
CIN
COP
CON
VREF
TP9
Connections for crystal or ceramic resonator
(OSC1 = Input ; OSC2 = Output)
Serial Interface Out
Serial Interface In
Connections for outer loop capacitors of
A/D converter (Voltage)
Connections for inner loop capacitors of
A/D converter (Voltage)
Connections for inner loop capacitors of
A/D converter (Current)
Connections for outer loop capacitors of
A/D converter (Current)
Connection for current setting resistor
Test Pin. Must be connected to V
SS
Description
Ground
Positive Supply Voltage
Negative Supply Voltage
Analog input for Voltage
Inputs for current sensor
FUNCTIONAL DESCRIPTION
The SA9103C 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 SA9103C integrates the measured
active and reactive power consumption into 22 bit integrators, which are accessable via
a serial port having a RS232 protocol. Two additional on-chip registers exist: one register
contains the mains frequency information; and the other the voltage information.
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SA9103C
1.
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 200µΩ). This voltage is
converted to a current of between 0 and 16µA, 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 (230V AC) is divided down through
a divider to 14V. The resulting current into the A/D converter input is 14µA at
nominal voltage, via resistor R4 (1MΩ).
In this configuration, with a mains voltage of 230V and a current of 80A, the
SA9103C functions at its optimum conditions, having a margin of 3dB for overload
available.
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.
V DD
IIP
CURRENT
SENSOR
INPUTS
V SS
V DD
A
I
IIN
V SS
V DD
IVP
VOLTAGE
SENSOR
INPUT
V SS
A
V
DR-00831
GND
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