Sharp R-370EK Service Manual page 24

R- 370EK
R- 37 0ES
Pin No. Signal
9 AN1
10 AN0
11-13 P57-P55 OUT
14 CNTR0 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
25 P41 OUT
26 P40
27
RESET
28-29 P71-P70 OUT
30 XIN
I/O
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 G11 line on key matrix is touched, a corresponding signal out of P20 - P26
will be input into P46. When no key is touched, the signal is held at "H" level.
IN Signal similar to P46.
When either G10 line on key matrix is touched, a corresponding signal will be input into P45.
IN Signal similar to P46.
When either G9 line on key matrix is touched, a corresponding signal will be input into P44.
IN Signal similar to P46.
When either G8 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.
Terminal not used.
IN Connected to GND through the pull-down resistor R100.
IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set
"L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H"
level.
Terminal not used.
IN Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
Description
P-HI
P-70
(ON and OFF times for other power level.)
22
0.1 sec.
H : GND
A
L : -5V
2.0 sec.
H : GND
B
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.
H : GND
L : -5V
H : GND
L : -5V