17
R-3C57
DESCRIPTION OF LSI
LSI(IZA655DR)
The I/O signal of the LSI(IZA655DR) is 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 R11 - R13, R20, R21, R23 and D6 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 R11 - R13, R20, R21, R23 and D6 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 R11 - R13, R20, R21, R23 and D6 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 R11 - R13, R20, R21, R23 and D6 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.
2 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 : 45Hz)
To turn on and off shut-off relay. The square (45Hz) 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 Low operation, the signals holds “L” level during
microwave cooking and “H” level while not cooking. In other cooking modes
(P10~P90) 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.
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