Electrolux EI30MH55GB Service Manual - Page 26

Description Of Lsi

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EI30MH55GSA EI30MH55GBA EI30MH55GWA DESCRIPTION OF LSI LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal I/O 1-2 VL2-VL1 IN 3-5 AN7-AN5 IN 6 AN4 IN 7 AN3 OUT 8 AN2 IN 9 AN1 IN 10 AN0 IN 11 P57 OUT Description Power source voltage input terminal. Standard voltage for LCD. 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. 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. To input signal which communicates the door open/close information to LSI. Door close "H" level signal (0V). Door open "L" level signal (-5V). Humidity sensor input for R2120J. This input is an analog input terminal from the humidity sensor circuit, and connected to the A/D converter built into the LSI. 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 for R-2120J. Oven lamp, fan motor stirrer motor and inverter unit driving signal To turn on and off shut off relay (RY1). The square waveform voltage is delivered to the RY1 driving circuit. 6.7 msec. H : GND 12 13 14-18 19 20 21 22 23 24 P56 P50 P54-P50 P47 P46 P45 P44 P43 INT0 OUT OUT OUT OUT IN IN IN IN IN Signal to sound buzzer (2.0 kHz). During cooking L : -5V A: key touch sound. B: Completion sound. Terminal not used. 0. sec. A 2.0 sec. B H : GND L : -5V H : GND L : -5V Used for initial balancing of the bridge circuit (humidity sensor) for R2120J. Power level data output signal for inverter unit. The power level will be decided by the time ratio of T1 and T2. 6.7 msec. H : GND Signal coming from touch key. T T2 L : -5V When either G1 line on key matrix is touched, a corresponding signal out of P20 - P27 will be input into P46. When no key is touched, the signal is held at "H" level. Signal similar to P46. When either G2 line on key matrix is touched, a corresponding signal will be input into P45. Signal similar to P46. When either G3 line on key matrix is touched, a corresponding signal will be input into P44. 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. This is the basic timing for time processing of LSI. 6.7 msec. H : GND L : -5V 26

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26
EI30MH55GSA
EI30MH55GBA
EI30MH55GWA
±6.7 msec.
H : GND
L : -5V
DESCRIPTION OF LSI
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No.
Signal
I/O
Description
±-2
VL2-VL±
IN
Power source voltage input terminal.
Standard voltage for LCD.
3-5
AN7-AN5
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.
6
AN4
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.
7
AN3
OUT
Back light circuit (Light emitting diodes) driving signal.
8
AN2
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).
9
AN±
IN
Humidity sensor input for R2120J.
This input is an analog input terminal from the humidity sensor circuit, and connected
to the A/D converter built into the LSI.
±0
AN0
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 for R-2±20J.
±±
P57
OUT
Oven lamp, fan motor stirrer motor and inverter unit driving signal
To turn on and off shut off relay (RY±).The
square waveform voltage is delivered to the
RY± driving circuit.
±2
P56
OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
±3
P50
OUT
Terminal not used.
±4-±8
P54-P50
OUT
Used for initial balancing of the bridge circuit (humidity sensor) for R2±20J.
±9
P47
OUT
Power level data output signal for inverter unit.
The power level will be decided by the time ratio
of T± and T2.
20
P46
IN
Signal coming from touch key.
When either G± line on key matrix is touched, a corresponding signal out of P20 - P27
will be input into P46. When no key is touched, the signal is held at “H” level.
2±
P45
IN
Signal similar to P46.
When either G2 line on key matrix is touched, a corresponding signal will be input into
P45.
22
P44
IN
Signal similar to P46.
When either G3 line on key matrix is touched, a corresponding signal will be input into
P44.
23
P43
IN
Signal similar to P46.
When either G4 line on key matrix is touched, a corresponding signal will be input into
P43.
24
INT0
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
A
B
0.± sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V
±6.7 msec.
During cooking
H : GND
L : -5V
±6.7 msec.
T±
T2
L : -5V
H : GND