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PDF SA9605 Datasheet ( Hoja de datos )

Número de pieza SA9605
Descripción THREE PHASE POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT
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SA9605 datasheet

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SA9605 pdf
SA9605A
1. Power Calculation
In the Application Circuit (Figure 1), the mains voltages from Line 1, Line 2 and Line
3, are converted to currents and applied to the voltage sense inputs IVN1, IVN2 and
IVN3.
The current levels on the voltage sense inputs are derived from the mains voltage
(3 x 230 VAC) being divided down through voltage dividers to 14V. The resulting
input
currents
into
the
A/D
converters
are
14µA
through
the
resistors
R,
15
R
16
and
R.
17
For the current sense inputs the voltage drop across the current transformers
terminating resistors are converted to currents of 16µA for rated conditions, by
means of resistors R8, R9 (Phase 1); R10, R11 (Phase 2); and R12, R13 (Phase 3).
The signals providing the current information are applied to the current sensor
inputs: IIN1, IIP1; IIN2, IIP2; and IIN3, IIP3.
In this configuration, with the mains voltage of 3 x 230 V and rated currents of 80A,
the output frequency of the SA9605A energy metering integrated circuit at FOUT1
is 1.16kHz. In this case 1 pulse will correspond to an energy consumption of 3 x 18.4
kW/1160Hz = 47.6 Ws.
The output frequency at FOUT1 and FOUT2 represents the absolute sum of the
energy measured on all three phases, regardless of the direction of energy flow
through the current sensors. This measurement method will assist meter
manufacturers to circumvent meter tampering by reversal of the phases.
2. Analog Input Configuration
The current and voltage sensor inputs are illustrated below.
These inputs are protected against electrostatic discharge through clamping
diodes, in conjunction with the amplifiers input configuration.
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 processing circuitry.
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SA9605 arduino
SA9605A
XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator
frequency is divided down to 1.78975 MHz on-chip, to supply the digital circuitry and the
A/D converters.
Figure 1: Application Circuit for Three Phase Power/Energy Measurement.
MAINS VOLTAGES
LINE 1
LINE 2
R1
R2
LINE 3
R3
R1A
R2A
R3A
VI2P
VI2N
VI3P
VI3N
FOUT1
FOUT2
DIR
R19
C3
R20
R6
P6
0V
R11
1
R10
2
R17
3
R13 4
R12
5
6
7
8
9
10
SA9605A
DIP - 20
IC-1
20
19
18
17
16
15
14
13
12
11
R16 C2
R8
R9
R15 C1
PGM1
PGM0
R14
P14
R18
R4 R5
P5
R7
0V
VI1P
VI1N
5V
XTAL 0V R21
C14
C13 C12
0V
DR-01112
0V
10/14
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