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PDF SA9103CSA Data sheet ( Hoja de datos )
| Número de pieza | SA9103CSA | |
| Descripción | SINGLE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH SERIAL INTERFACE | |
| Fabricantes | Sames | |
| Logotipo |  |
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SA9103C
SINGLE PHASE BIDIRECTIONAL POWER/ENERGY
METERING IC WITH SERIAL INTERFACE
FEATURES
n Performs bidirectional active and n Adaptable to different current sensor
reactive power/energy, frequency and
technologies
voltage measurement
n Operates over a wide temperature
n Meets the IEC 521/1036 Specification
range
requirements for Class 1 AC Watt hour
meters
n
Serial interface having a RS232 protocol
n Protected against ESD
n Precision voltage reference on-chip
n Tri-state output to allow parallel
n Total power consumption rating below
connection of devices
25mW
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.
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 GND
19 IVP
18 CON
17 COP
16 CIN
15 CIP
14 V SS
13 SIN
12 SOUT
11 OSC1
Package: DIP-20
SOIC-20
4259
PDS039-SA9103C-001
1/16
REV. D 23-08-1996
1 page  
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 R1 and R2.
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 and A generate virtual
IV
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
AI
IIN
VSS
VDD
IVP
VOLTAGE
SENSOR
INPUT
V SS
AV
DR-00831
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GND
5/16
5 Page 
SA9103C
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 for the circuit.
The most important external components for the SA9103C integrated circuit are:
C1 and C2 are the outer loop capacitors for the two integrated oversampling A/D
converters. The value of these capacitors is 560pF. The actual values determine the
signal to noise and stability performance. The tolerances should be within ±10%.
C3 and C4are the inner loop capacitors of the A/D converters. The optimum value is 3.3nF.
The actual values are uncritical. Values smaller than 0.5nF and larger than 5nF should
be avoided.
R1, R2 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 SA9103C at rated line
current.
Values for RSH of less than 200µΩ should be avoided.
R1 = R2 = (IL/16µA) * RSH/2
Where I
L
= 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.
R7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum conditions
are set.
XTAL is a colour burst TV crystal (f = 3.5795MHz) for the oscillator. The oscillator
frequency is divided down to 1.7897MHz on-chip to supply the A/D converters and digital
circuitry.
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