Sharp R-320BB Service Manual page 23

LSI(IZA865DR)
The I/O signal of the LSI(IZA865DR) is detailed in the following table.
Pin No. Signal
1-2 VL2-VL1
3-6 AN7-AN4
7 AN3 OUT
8 AN2
9 AN1
10 AN0
11-13 P57-P55 OUT
14 P54 OUT
15 P53 OUT
16 P52 OUT
17 P51 OUT
18 P50 OUT
19 P47 OUT
20 P46
21 P45
22 P44
23 P43
24 INT0
I/O
IN Power source voltage input terminal.
Standard voltage for LCD.
IN 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.
Terminal not used.
IN To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
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.
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.
Used for initial balancing of the bridge circuit (absolute humidity sensor).
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
Used for initial balancing of the bridge circuit (absolute humidity sensor).
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.
Used for initial balancing of the bridge circuit (absolute humidity sensor).
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.
IN Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P20 - P27 will
be input into P46. When no key is touched, the signal is held at "H" level.
IN Signal similar to P46.
When either G11 line on key matrix is touched, a corresponding signal will be input into P45.
IN Signal similar to P46.
When either G10 line on key matrix is touched, a corresponding signal will be input into P44.
IN Signal similar to P46.
When either G9 line on key matrix is touched, a corresponding signal will be input into P43.
IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
Description
A
B
P-HI
P-70
(ON and OFF times for other power level.)
21
0.1 sec.
H : GND
L : -5V
2.0 sec.
H : GND
L : -5V
16.7 msec.
During cooking
OFF
H : GND
ON
L : -5V
OFF OFF
H : GND
24 sec.
8 sec.
ON
L : -5V
16.7 msec.
R-320BB
R-320BK
R-320BW
H : GND
L : -5V
H : GND
L : -5V