R-3A88
15
DESCRIPTION OF LSI
LSI(IZA683DR)
The I/O signal of the LSI(IZA683DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
1
Vdisp
IN
Anode (segment) of Fluorescent Display light-up voltage: -34V
Vp voltage of power source circuit input.
2
R00
IN
Signal coming from touch key.
When either one of G12 line keys on key matrix is touched, a corresponding signal out of R10
- R13, R20, R21 and R22 will be input into R00. When no key is touched, the signal is held
at "L" level.
3
R01
IN
Signal coming from touch key.
When either one of G11 line keys on key matrix is touched, a corresponding signal out of R10
- R13, R20, R21 and R22 will be input into R01. When no key is touched, the signal is held
at "L" level.
4
R02
IN
Signal coming from touch key.
When either one of G10 line keys on key matrix is touched, a corresponding signal out of R10
- R13, R20, R21 and R22 will be input into R02. When no key is touched, the signal is held
at "L" level.
5
R03
IN
Signal coming from touch key.
When either one of G9 line keys on key matrix is touched, a corresponding signal out of R10
- R13, R20, R21 and R22 will be input into R03. When no key is touched, the signal is held
at "L" level.
6
TEST
IN
Connected to VC.
7
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to “L”
level the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.
8
OSC1
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect
to OSC1 terminal.
9
OSC2
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of OSC2.
10/11
GND/AVSS
IN/IN
Connected to VC.
12
AN0
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal.
Door opend; "L" level signal.
13-14
AN1-AN2
IN
Terminal to change cooking constant.
15
R33
OUT
Oven lamp, turntable motor and cooling fan motor driving signal. (Square Waveform
: 50Hz)
To turn on and off shut-off relay. The square (50Hz) is delivered to the relay driving circuit and
cook relay control circuit.
16
P40
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay. In 100% power operation, the signals holds “L” level during
microwave cooking and “H” level while not cooking. In other cooking modes (10%, 30%, 50%,
70% power) the signal turns to “H” level and “L” level in repetition according to the power level.
17-19
R41-R43
OUT
Segment data signal.
Refer to the touch control panel circuit for the relationship between signals and indicators.
Normally, one pulse is output in every synchronized signal period, and input to the anode of
the fluorescent display.
20/21
AVCC/VCC
IN/IN
Connected to GND.
22
INT
IN
Signal to synchronized with commercial source frequency(50Hz).
This is basic timing for time processing of LSI.
23-24
D1-D2
OUT
Segment data signal.
Refer to the touch control panel circuit for the relationship between signals and indicators.
Normally, one pulse is output in every synchronized signal period, and input to the anode of
the fluorescent display.
Summary of Contents for R-3A88
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