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The touch control section consists of the following units.
(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit and
LSI Unit).
The principal functions of these units and the signals com-
municated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P110-P117.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P100, P101,
P102, P103, ANI6, ANI7 to perform the function that was
requested.
Control Unit
Control unit consists of LSI, ACL circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchro-
nizing signal circuit and back light circuit.
1) ACL
This circuit generates a signal which resets the LSI to the
initial state when power is supplied.
2) Indicator Circuit
This circuit consists of 36 segments and 3 common
electrodes using a Liquid Crystal Display.
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No.
Signal
1-2
P26-P27
OUT
3-5
P70-P72
OUT
6
IC
7
X2
OUT
8
X1
9
Vdd1
10
XT1
11
XT2
OUT
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
I/O
Terminal not used.
Terminal not used
IN
Connected to VC.
Internal clock oscillation output.
Output to control ocsillation input to X1
IN
Internal clock oscillation frequency comtrol input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to X2 terminal.
IN
Power source voltage: GND (0V).
The power source voltage to drive LSI is input to VDD1 terminal.
IN
Connect to GND.
Terminal not used.
3) Power Source Circuit
This circuit generates voltages necessary in the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
Symbol
Voltage
VC
-5V
4) Relay Circuit
A circuit to drive the magnetron, fan motor, turntable
motor and light the oven lamp.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
6) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit.
It accompanies a very small error because it works on
commercial frequency.
7) Door Sensing Switch
A switch to "tell" the LSI if the door is open or closed.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes LD1-
LD4).
9) Absolute Humidity Sensor Circuit
This circuit detects moisture of the cooking food to allow
its automatic cooking.
Description
21
R-420EK
Application
LSI(IC1)
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