Sharp R-2397 Description Of Lsi, LSIIZA646DR, Pin No, Reference voltage input terminal, 50Hz

R-2397

DESCRIPTION OF LSI

LSI(IZA646DR)

The I/O signal of the LSI(IZA646DR) is detailed in the following table.

Pin No.

Signal

I/O

Description

1

VREF

IN

Reference voltage input terminal.

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

2

IN7

IN

Temperature measurement input: MAGNETRON 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.

3

IN6

IN

Temperature measurement input: EXHAUST 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.

4

IN5

IN

A/D input for troubleshooting Magnetron 1.

5

IN4

IN

Terminal to change functions according to the model.

Signal in accordance with the model in operation is applied to set up its function.

6

IN3

IN

A/D input for troubleshooting Magnetron 2.

7

IN2

IN

Connected to GND.(0V)

8

IN1

IN

Terminal not used.

9

IN0

IN

Temperature measurement input: INTAKE 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.

10

P47

OUT

Terminal not used.

11

P46

OUT

Memory (EEPROM) clock output.

12

P45

IN/OUT

Memory (EEPROM) data input/output.

13-14

P44-P43

OUT

Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay. In 100% power level operation, "L" level during cooking;

"H" level otherwise. In other power level operation (90,80,70,60,50,40,30,20,10 or 0%),

"H" and "L" level is repeated according to power level.

Power level

ON

OFF

Power level

ON

OFF

OFF

GND

100%

48sec.

0sec.

40%

22sec.

26sec.

90%

44sec.

4sec.

30%

16sec.

32sec.

ON

80%

40sec.

8sec.

20%

12sec.

36sec.

-5V

70%

36sec.

12sec.

10%

8sec.

40sec.

48 sec.

60%

32sec.

16sec.

0%

0sec.

48sec.

50%

26sec.

22sec.

15

P42

OUT

Power supply output at thermistor detecting circuit.

(Output -5V in cooking only, but apply high impedance to others to prevent thermistor from

electrolytic corrosion ocurrence.)

16

P41

OUT

Terminal not used.

17

P40

OUT

Oven lamp, Blower motor and Stirrer motor driving signal. (Square Waveform :

50Hz)

During cooking

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

H

Square waveform voltage is delivered to the

RY1

relay

driving

circuit

and

L

20 msec

relays(RY3,RY4,COOK RELAY) control circuit.

18-22

P37-P33

OUT

Terminal not used.

23

P32

OUT

Signal to sound buzzer.

0.12 sec

GND

This signal is to control the 2.5kHz continuous

A

-5V

signal.

1.2 sec

1.2 sec

2.4 sec

A: key touch sound.

B

C

B: Guydance sound.

T

C: Completion sound.

200∝sec.

200∝sec.

24

P31

IN

Signal synchronized with commercial power source frequency.

This is basic timing for all time processing of LSI.

H : GND

L (-5V)

20 msec

25

P30

OUT

Terminal not used.

26

CNVSS

IN

Connected to Vc.(-5V)

18