R-875/885 -
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The I/O signal of the LSI are detailed in the following table.
Pin No.
Signal
I/O
Description
1
C1
IN
Terminal not used.
2
VL1
IN
Power source voltage input terminal.
Standard voltage for LCD.
3
AN7
IN
Terminal to change ON timing of the cook relay (RY2).
4-5
AN6-AN5
IN
Heating constant compensation terminal.
6
AN4
IN
Signal coming from potentiometer.
By inputting DC voltage corresponding to the cooking mode set by the potentiometer,
this input is converted into the cooking mode by the A/D converter built into the LSI.
7
AN3
IN
Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the
thermistor, this input is converted into the temperature by the A/D converter built
into the LSI.
8
AN2
IN
Input signal which communicates the door open/close information to LSI.
Door closed; “H” level signal.
Door opened; “L” level signal.
9
AN1
IN
Heating constant compensation terminal.
10
AN0
IN
Terminal to change functions to the Models.
11
P57
OUT
Timing signal output terminal for temperature measurement(OVEN
THERMISTOR).
“H” level (GND) : Thermistor OPEN timing.
“L” level (-5V) : Temperature measuring timing. (Convection cooking)
12
P56
OUT
Terminal not used.
13
P55
OUT
Timing signal output terminal for temperature measurement(OVEN
THERMISTOR).
“H” level (GND) : Thermistor OPEN timing.
“L” level (-5V) : Temperature measuring timing. (Convection cooking)
14
P54
OUT
Terminal not used.
15
P53
IN
Signal coming from touch tact switch.
When any one of J-8 line tact switches on jog switch unit matrix is touched, a
corresponding signal from P40, P41, P76 and P77 will be input into P53. When no
tact switch is touched, the signal is held at “L” level.
16
P52
IN
Signal similar to P53.
When any one of J-7 line tact switches on key and jog switch unit matrix is touched,
a corresponding signal will be input into P52.
17
P51
IN
Signal similar to P53.
When any one of J-4 line tact switches on key and jog switch unit matrix is touched,
a corresponding signal will be input into P51.
18
P50
IN
Signal similar to P53.
When any one of J-3 line tact switches on key and jog switch unit matrix is touched,
a corresponding signal will be input into P50.
19
P47
OUT
Memory (EEPROM) clock out.
20
P46
IN/OUT
Memory (EEPROM) data input/output.
21-22
P45-P44
IN/OUT
Terminal not used.
23
TOUT
OUT
Signal to sound buzzer.
A: Tact switch touch sound.
B: Completion sound.
C: When the temperature of the oven cavity
reaches the preset temperature in the
preheating mode, or when the
preheating hold time (30 minutes) is
elapsed.
24
INT2
IN
Signal to synchronized LSI with commercial power source frequency(50Hz).
This is basic timing for time processing
of LSI.
25
P41
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P51-P53 terminal
while one of J-6 line tact switches on matrix is touched.
A
B
C
H : GND
L
0.1 sec.
2.0 sec.
1.0 sec.
1.0 sec.
20 msec.
H : GND
L (-5V)
DESCRIPTION OF LSI
