Sharp R-343WM Service Manual page 9

DESCRIPTION OF LSI
LSI(IZA919DR)
The I/O signal of the LSI(IZA919DR) are detailed in the following table.
Pin No. Signal
1-12 SEG0 -
SEG11
13 R60
14 R61
15 R62
16 R63
17 AIN0
18-20 AIN1-AIN3
21 VSS
22 R70
23 R71
I/O
OUT Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
LCD (Pin No.)
SEG 0 (1) .............................. S12(4)
S6(10)
SEG 1 (2) .............................. S11(5)
S5(11)
SEG 2 (3) .............................. S10(6)
S4(12)
SEG 3 (4) ................................ S9(7)
S3(13)
SEG 4 (5) ................................ S8(8)
S2(14)
SEG 5 (6) ................................ S7(9)
S1(15)
OUT Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R81 terminal while
the tact switch SW4 or the tact switch SW5 is touched.
OUT Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R81 terminal while
the tact switch SW3 or the tact switch SW7 is touched.
OUT Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R81 terminal while
the tact switch SW2 or the tact switch SW6 is touched.
OUT Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to R81 terminal while
the tact switch SW1 is touched.
IN To input signal which communicates the door open/close information to
LSI.
Door close "L" level signal (0V). Door open "H" level (+5V)
IN Terminal to change functions 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 function.
IN Power source voltage: 0V.
VSS voltage of power source circuit input.
OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
The signals holds "L" level during micro-
wave cooking and "H" level while not
cooking. In other cooking modes (vari-
able cooking) the signal turns to "H"
level and "L" level in repetition accord-
ing to the power level.
OUT Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
Description
LCD (Pin No.)
R343M - 9
LSI signal (Pin No.)
SEG 6 (7)
SEG 7 (8)
SEG 8 (9)
SEG 9 (10)
SEG 10 (11)
SEG 11 (12)
OFF
HIGH
ON
OFF OFF
24 sec.
MEDIUM
8 sec.
ON
HIGH
0.1 sec.
A
2 sec.
B
H : +5V
L : 0V
H : +5V
L : 0V
H : +5V
L: 0V
H : +5V
L: 0V