Sharp R-930AW service manual Description Of Lsi, LSIIZA797DR, Pin No, Signal, Power source voltage

R-930AK

R-930AW

DESCRIPTION OF LSI

LSI(IZA797DR):

The I/O signals of the LSI(IZA797DR) are detailed in the following table.

Pin No.

Signal

I/O

Description

1

VCC

IN

Connected to GND.

2

VEE

IN

Anode (segment) of Fluorescent Display light-up voltage: -30V.

Vp voltage of power source circuit input.

3

AVSS

IN

Power source voltage: -5V.

VC voltage of power source circuit input.

4

VREF

IN

Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)

5

AN7

IN

Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is

an analog input terminal from the AH sensor circuit, and connected to the A/D

converter built into the LSI.

6

AN6

IN

AH sensor input.

This input is an analog input terminal from the AH sensor circuit, and connected to the

A/D converter built into the LSI.

7-9

AN5-AN3

IN

Heating constant compensation terminal.

10

AN2

IN

Input signal which communicates the door open/close information to LSI.

Door closed; "H" level signal(0V).

Door opened; "L" level signal(-5V).

11

AN1

IN

Input signal which communicates the damper open/close information to LSI.

Damper opened; "H" level signal(0V:GND).

Damper closed; "L" level signal(-5V).

12

AN0

IN

Temperature measurement input: OVEN THERMISTOR.

By inputting DC voltage corresponding to the temperature detected by the thermistor,

this input is converted into temperature by the A/D converter built into the LSI.

13

P55

OUT

Digit selection signal.

The relationship between digit signal and digit are as follows;

Digit signal

Digit

H

ß(60Hz)

P03........................... 1st.

L

P02.......................... 2nd.

GND

P01........................... 3rd.

P03

VP

P02

P00........................... 4th.

P01

P37........................... 5th.

P00

P36

6th.

P37

P35

7th.

P36

P55

8th.

P35

Normally, one pulse is output in every ß

period, and input to the grid of the Fluores-

P55

cent Display.

14

P54

OUT

Oven lamp and turntable motor driving signal. (Square Waveform : 60Hz)

To turn on and off the shut-off relay(RY1).

16.7 msec.

The square waveform voltage is delivered to

H

the relay(RY1) driving circuit.

L

During cooking

15

P53

OUT

Convection motor driving signal.

During

H. GND

To turn on and off shut-off relay(RY5). "L"

OFF

cooking

level during CONVECTION; "H" level other-

ON

(Convection)

L

wise.

16

P52

OUT

Cooling fan motor driving signal.

To turn on and off shut-off relay(RY6). "L"

H. GND

During

OFF

level during both microwave and convection

ON

cooking

L

cooking; "H" level otherwise.

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