Drawer Microwave
(Models MWD24-2 / MWD30-2)
Theory of Operation
3-18
#813632 - Revision B - December, 2009
DESCRIPTION OF LSI (IC-1)
The I/O signal of the LSI is detailed in the following table:
Pin No.
1- 3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24 - 25
26
AN5
AN3
AN2
AN1
AN0
CNVSS
RESET
P62
P61
VSS
XIN
XOUT
VCC
P60
P37
P36
TXOUT
P34
RXD2
TXD2
SCLK2
P30
COM3
COM2
COM1
IN
IN
IN
IN
IN
IN
OUT
IN/OUT
IN
IN
OUT
IN
IN
IN
OUT
OUT
OUT
IN
IN
OUT
OUT
OUT
OUT
Terminal to Change Cooking Input According to the Model:
By using A/D con-
verter contained in the LSI, DC voltage in accordance with the Model in operation is
applied to set up its cooking constant.
Input signal which inform the drawer door is in the middle position between the
opened position and the closed position, to LSI from the door position switch rear.
Terminal not used.
Terminal not used.
Power Source Voltage: 0V (GND):
VC voltage of power source circuit input.
Connected GND.
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.
Terminal not used.
Terminal not used.
Power Source Voltage: 0V (GND):
VS voltage of power source circuit input.
Connected GND.
Internal Clock Oscillation Frequency Setting Input:
The internal clock frequency
is set by inserting the ceramic filter oscillation circuit with respect to Xout terminal.
Internal Clock Oscillation Frequency Control Output:
Output to control oscillation
input of Xin.
Power Source Voltage: +5V:
VC voltage of power source circuit input.
Plus signal coming from the Microwave drawer door open-close motor is input into
P60 as revolution number.
Input Signal Which Communicates the Drawer Door Open Information to LSI
from the Door Position Switch Front:
Door opened; “L” level signal(0V). Door
closed; “H” level 5V).
Signal to change the rotational direction is output to the Microwave drawer door
open-close motor.
Signal to change the rotational speed is output to the Microwave drawer door open-
close motor.
Power source to drive the Microwave drawer door open-close motor is output.
Input Terminal to Check the Data of Display:
Data signal from IC-2 is input to
RXD2 to check the flow of the data.
Output Terminal to Send IC-2 the Data:
The data of display is output to IC-2.
Clock Timing Signal Output Terminal:
Clock timing signal is sent to IC-2.
Signal to Reset LSI:
Signal is output to reset IC-2.
Terminal not used.
Common Data Signal:
Connected to LCD signal C5.
Signal
I/O
Description
