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Número de pieza SA9602MSA
Descripción SINGLE PHASE POWER/ENERGY METERING IC WITH SELECTABLE PULSE RATE FOR MECHANICAL DISPLAY APPLICATIONS
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SA9602M
SINGLE PHASE POWER/ENERGY METERING IC WITH
SELECTABLE PULSE RATE FOR MECHANICAL DISPLAY
APPLICATIONS
FEATURES
n Provides ease of interface to systems n Total power consumption rating below
employing a mechanical counter
25mW
n Performs bidirectional power and n Adaptable to different types of current
energy measurement
sensors
n Meets the IEC 521/1036 Specification n Operates over a wide temperature range
requirements for Class 1 AC Watt hour n Precision voltage reference on-chip
meters
n Selectable pulse rate
n
n
Protected against ESD
Allows selection of motor driver
configuration
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.
7130
PIN CONNECTIONS
IIN 1
IIP 2
VREF 3
R1 4
R0 5
MP 1 6
MP 0 7
VDD 8
TE S T 9
O S C 2 10
D R -0132 8
Package:
20 G N D
19 IV P
18 D IR I
17 D IR O
16 MP W
15 MD
14 VS S
13 LE D
12 MO TO R
11 O S C 1
DIP-20
SOIC-20
PDS039-SA9602M-001 REV. B
1/16
9-09-97

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SA9602MSA pdf
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 16mVRMS (0 to 80A through a shunt resistor of 200µ). This voltage
is converted to a current of between 0 and 16µARMS, by means of resistors R1 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 . The current into the A/D converter input is set at 14µA at
RMS
RMS
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.
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 AI and AV generate virtual
shorts on the signal inputs. Exact duplications of the input currents are generated
for the analog signal processing circuitry.
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SA9602MSA arduino
SA9602M
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.
The most important external components for the SA9602M integrated circuit are:
R2, R1 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 SA9602M at
RMS
maximum line current.
Values for RSH of less than 200µshould be avoided.
R = R = (I /16µA ) * R /2
1 2L
RMS
SH
Where IL
= 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 14µARMS.
R defines all on-chip bias and reference currents.
7
With
R
7
=
24k,
optimum
conditions
are set. R7 may be varied within ±10% for calibration purposes. Any change to R7 will
affect the output quadratically (i.e.: R7 = +5%, fP = +10%).
The formula for calculating the output frequency is given below:
fLED= 11.16
* FOUTX * FOSC * II .IV
3.58MHz IR2
Where FOUTX = Frequency for selected rated condition
FOSC = Oscillator frequency (2MHz ...... 4MHz)
II = Input current for current input (16µARMS at rated)
IV = Input current for voltage input (14µARMS at rated)
I
= Reference current
(typically 50µA)
R
XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator
frequency is divided down to 1.7897 MHz on-chip, to supply the digital circuitry and the
A/D converters.
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