Sharp R-403KK Service Manual page 21

LSI
The I/O signal of the LSI is detailed in the following table.
Pin No. Signal I/O
1-2 VL2-VL1 IN
3-6 AN7-AN4 IN
7 AN3 IN
8 AN2 IN
9 AN1 IN
10 AN0 IN
11-13 P57-P55 OUT
14 CNTR0 OUT
15 P53 OUT
16 P52 OUT
17 P51 OUT
18 P50 OUT
19 P47 IN
20 P46 OUT
21 P45 IN
22-23 P44-P43 OUT
24 INT0 IN
DESCRIPTION OF LSI
Power source voltage input terminal.
Standard voltage for LCD.
Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
Signal coming from touch key.
When either G13 line on key matrix is touched, a corresponding signal out of P20 - P27
will be input into AN3. When no key is touched, the signal is held at "H" level.
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door Open "L" level (-5V).
Terminal not used.
Terminal not used.
Terminal not used.
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
Terminal not used.
Oven lamp, fan motor and turntable motor driving signal
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
Terminal not used.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave cook-
ing and "H" level while not cooking. In other
cooking modes (variable cooking) the signal
turns to "H" level and "L" level in repetition
according to the power level.
Signal similar to AN3.
When either G13 line on key matrix is touched, a corresponding signal will be input into
P46.
Night light circuit (Light emitting diode) driving signal.
Signal similar to AN3.
When either G12 line on key matrix is touched, a corresponding signal will be input into
P45.
Terminal not used.
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
19
Description
0.1 sec.
A
2.0 sec.
B
16.7 msec.
During cooking
OFF
Maximum
output
OFF
70% of maximum
output
16.7 msec.
R-405KS
R-403KK
H : GND
L : -5V
H : GND
L : -5V
H : GND
L : -5V
H : GND
ON
L : -5V
OFF
H : GND
24 sec.
8 sec.
ON
L : -5V
H : GND
L : -5V