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R33ST - 10
DESCRIPTION OF LSI
LSI(IZA988DR)
The I/O signal of the LSI(IZA988DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
cooking
(a. 32second time base)
MICRO
ON
OFF
COOK
100%
100%
32sec.
0sec.
70%
24sec.
8sec.
50%
18sec.
14sec.
30%
12sec.
20sec.
10%
6sec.
26sec.
20 msec
During cooking
H
L
20 msec
H : GND
L (-5V)
A
B
0.12 sec
2.4 sec
1
C1
IN
Terminal not used.
2
VL1
IN
Power source voltage input terminal.
Standard voltage for LCD.
3-6
AN7-AN4
IN
Heating constant compensation terminal.
7
AN3
IN
Terminal not used.
8
AN2
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal.
Door opened; "L" level signal.
Door opened; "L" level signal.
9-10
AN1-AN0
IN
Terminal not used.
11
P57
IN
Terminal not used.
12
P56
OUT
Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
B: Completion sound.
13-18
P55-P50
IN/OUT
Terminal not used.
19
P47
OUT
Oven lamp, fan motor and turntable motor driving signal(Square Wave-
form : 50Hz).
form : 50Hz).
To turn on and off shut-off relay (RY1).
The square waveform voltage is deliv-
ered to the relay (RY1) driving circuit
and relay (RY2) control circuit.
The square waveform voltage is deliv-
ered to the relay (RY1) driving circuit
and relay (RY2) control circuit.
20
P46
IN/OUT
Terminal not used.
21
P45
OUT
Back light driving signal.
To change the brightness of the back light (Light emitting diodes LD1 - LD5). The
square waveform voltage is delivered to the back light driving circuit.
square waveform voltage is delivered to the back light driving circuit.
22
P44
OUT
Terminal not used.
23
P43
IN
Terminal not used.
24
INT0
IN
Signal to synchronized LSI with commercial power source frequency(50Hz).
This is basic timing for time processing of LSI.
25
P41
IN
Terminal not used.
26
P40
OUT
Terminal not used.
27-28
P77-P76
OUT
Terminal not used.
29
P75
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
In 100% POWER operation, the signals
hold "L" level during microwave cooking
and "H" level while not cooking. In other
cooking modes (70%, 50%, 30%, 10%)
the signal turns to "H" level and "L" level
in repetition according to the power
level.
In 100% POWER operation, the signals
hold "L" level during microwave cooking
and "H" level while not cooking. In other
cooking modes (70%, 50%, 30%, 10%)
the signal turns to "H" level and "L" level
in repetition according to the power
level.
30-31
P74-P73
Terminal not used.
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