Description Of Lsi - Electrolux EI30MH55GBA Technical & Service Manual

Operation
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No. Signal
1-2 VL2-VL1
3-5 AN7-AN5
6 AN4
7 AN3 OUT
8 AN2
9 AN1
10 AN0
11 P57 OUT
12 P56 OUT
13 P50 OUT
14-18 P54-P50 OUT
19 P47 OUT
20 P46
21 P45
22 P44
23 P43
24 INT0

Description of LSI

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.
IN Temperature measurement input: MAGNETRON THERMISTOR.
By inputting DC voltage corresponding to thetemperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the SLI.
Back light circuit (Light emitting diodes) driving signal.
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 Humidity sensor input f
This input is an analog input terminal from the humidity sensor circuit, and connected
to the A/D converter built into the LSI.
IN Used for initial balancing of the bridge circuit (humidity sensor). This input is an analog
input terminal from the humidity sensor circuit, and connected to the A/D converter
built into the LSI
Oven lamp, fan motor stirrer motor and inverter unit driving signal
To turn on and off shut off relay (RY 1). The
square waveform voltage is delivered to the
RY1 driving circuit.
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
Terminal not used.
Used for initial balancing of the bridge circuit (humidity sensor)
Power level data output signal for inverter unit.
The power level will be decided by the time ratio
of T1 and T2.
IN Signal coming from touch key.
When either G1 line on key matrix is touched, a correspondingsignal 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 G2 line on key matrix is touched, a corresponding signal will be input into
P45.
IN Signal similar to P46.
When either G3 line on key matrix is touched, a corresponding signal will be input into
P44.
IN Signal similar to P46.
When either G4 line on key matrix is touched, a corresponding signal will be input into
P43.
Signal synchronized with commercial power source frequency.
IN
This is the basic timing for time processing of LSI.
Description
0.1 sec.
A
B
2-8
16.7 msec.
During cooking
H : GND
L : -5V
2.0 sec.
H : GND
L : -5V
16.7 msec.
H : GND
L : -5V
T2
T1
16.7 msec.
H : GND
L : -5V
H : GND
L : -5V