SA9602E(2017) Просмотр технического описания (PDF) - South African Micro Electronic Systems
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Компоненты Описание
производитель
SA9602E
(Rev.:2017)
(Rev.:2017)
South African Micro Electronic Systems
SA9602E Datasheet PDF : 10 Pages
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SA9602E
ELECTROSTATIC DISCHARGE (ESD)
PROTECTION
The SA9602E integrated circuits inputs and outputs are
protected against ESD.
POWER CONSUMPTION
The power consumption rating of the SA9602E integrated
circuit is less than 25mW.
INPUT SIGNALS
VREF
A bias resistor of 24k sets optimum bias conditions on chip.
Calibration of the SA9602E should be done on the voltage
input as described in Typical Applications.
Current Sense Inputs (IIP and IIN)
Figure 3 shows the typical connections for the current sensor
input. The resistors R1 and R2 define the current level into
the current sense inputs of the SA9602E. At maximum rated
current the resistor values should be selected for input
currents of 16μARMS. The current sense inputs saturate at an
input current of ±25μA peak.
Values for resistors R1 and R2 can be calculated as follows:
��1
=
��2
=
����
16����
×
������
2
where
IL is the line current and
RSH is the shunt resistor or termination resistor if a CT
(current transformer) is used as the current sensor.
The value of RSH, if used as a CT termination resistor, should
be less than the DC resistance of the secondary winding of
the CT. The voltage drop across RSH should not be less than
16mVRMS at rated currents.
Voltage Sense Input (IVP)
The current into the A/D converter should be set at 14μARMS
at nominal mains voltage. The voltage sense input saturates
at an input current of ±25μA peak. Referring to Figure 3, the
typical connections for the voltage sense input is illustrated.
Resistors R3, R4 and R5 set the current for the voltage sense
input. The mains voltage is divided down to 14VRMS. The
current into the A/D converter input is set at 14μARMS via
resistor R5.
OUTPUT SIGNALS
Pulse Outputs (FOUT1 and FOUT2)
The output on FOUT1 and FOUT2 is a pulse density signal
representing the instantaneous power/energy measurement
as shown in Figure 5. The pulse width (tp) is 71μs. The output
frequency may be calculated using the following formula:
��
=
11.16
×
����������
×
���� × ����
���� 2
×
����������������
3.5795
where
FOUTX is the typical rated output frequency (1160Hz on
FOUT1 and 4Hz on FOUT2),
II is the input current on the current sense inputs in RMS
(16μA at rated conditions),
IV is the input current on the voltage sense input in RMS
(14μA at rated conditions),
IR is the reference current on VREF, typically 50μA, and
fCRYSTAL is the frequency of the crystal used in MHz.
VMAINS
t
Power
VxI
t
FOUT
tP
Figure 5: Instantaneous pulse output
OSCILLATOR
The SA9602E contains a crystal oscillator driver circuit
requiring only an external crystal to be connected between
OSC1 and OSC2. All other components are integrated on the
device. The recommended crystal is a TV colour burst crystal
(3.5795MHz).
SPEC-3117 (REV. 5)
5/10
29-09-2017
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