22
MMD24S
MMD24B
Pin No.
Signal
I/O
Description
47
P05
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay(RY2). In 00%
power operation, the signals holds “H” level during
microwave cooking and “L” level while not cooking.
In other cooking modes (90%, 80%, 70%, 60%,
50%, 40%, 30%, 20%, 0%, 0%) the signal turns
to “H” level and “L” level in repetition according to
the power level.
48-52
P04-P00
OUT
Used for initial balancing of the bridge circuit (absolute humidity sensor).
53
P57
OUT
Common relay driving signal. (Square Waveform : 60Hz)
To turn on and off the shut-off relays (RY). The
square waveform voltage is delivered to the relay
(RY) driving circuit.
54
P56
IN
Terminal not used.
55
TXD
IN
Terminal not used.
56
RXD
IN
Terminal not used.
57
P53
IN
Terminal not used.
58
P52
OUT
Signal to sound buzzer.
A: Key touch sound.
B: Completion sound.
C: When the oven stops so that the food can be
checked in Automatic cooking mode.
59
P5
IN
Input signal which communicates the drawer door close information to LSI.
Door opened; “H” level 5V).
Door closed; “L” level signal(0V).
60
INT0
IN
Signal to synchronize LSI with commercial power source frequency.
This is the basic timing for all real time processing of LSI.
6
AVSS
IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
62
VREF
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to +5V.
63
AN7
IN
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
64
AN6
IN
Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is
an analog input terminal from the AH sensor circuit, and connected to the A/D converter
built into the LSI.
Microwave cooking mode
Other cooking mode
VARI MODE
ON TIME OFF TIME ON TIME OFF TIME
00% power
32 sec.
0 sec.
60sec.
0ec.
90% power
30 sec.
2 sec.
54sec.
6sec.
80% power
26 sec.
6 sec.
48sec.
2sec.
70% power
24 sec.
8 sec.
42sec.
8sec.
60% power
22 sec.
0 sec.
36sec.
24sec.
50% power
8 sec.
4 sec.
30sec.
30sec.
40% power
6 sec.
6 sec.
24sec.
36sec.
30% power
2 sec.
20 sec.
8sec.
42sec.
20% power
8 sec.
24 sec.
2sec.
48sec.
0% power
6 sec.
26 sec.
4sec.
56sec.
0% power 0 sec.
32 sec.
0sec.
60sec.
During cooking
L: GND
H: +5V
6.7 msec.
A
B
C
H: +5V
L: GND
0. sec
2.0 sec
.0 sec
.0 sec
6.7 msec.
H : +5V
L : GND
