R-2397

Pin No.

Signal

I/O

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

46

P10

OUT

Segment data signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal similar to P17.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

47-48

P07-P06

OUT

Segment data signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal similar to P17.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

49

P05

OUT

Digit selection signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

The relation between digit signal and digit are as ß(50Hz)

 

 

 

 

 

 

 

 

 

 

L

 

 

 

follows:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Digit signal

Digit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P05

1st.

 

 

 

 

 

P05

 

 

 

 

 

 

 

 

 

 

 

-31(V)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P04

2nd.

 

 

 

 

 

P04

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P03

3rd.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P02

4th.

 

 

 

 

 

P03

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P01

5th.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P00

6th.

 

 

 

 

 

P02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normally, one pulse is output in every ß period,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

and input to the grid of the Fluorescent Display.

P00

 

 

 

 

 

 

 

 

 

 

-31(V)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50-54

P04-P00

OUT

Digit selection signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal similar to P16.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

55-57

P27-P25

OUT

Terminal not used.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

58-59

P24-P23

OUT

Segment data signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal similar to P17.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

P22

OUT

(Sound) Voltage level control terminal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This terminal (P22) is to control volume level of buzzer sound with terminals P21. Since

 

 

 

the volume level of buzzer sound depends on voltage energized, it is control level in 3

 

 

 

steps by combining signal levels for P22,P21. Relationship of signal level combination to

 

 

 

sound volume level is shown in the following table, 1~3 in the table, however, are indicated

 

 

 

in the descending order from the maximum level of sound volume through the minimum

 

 

 

level.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sound Volume

 

P21

P22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,(Max.)

 

 

L

L

 

 

 

 

 

 

 

 

 

 

A A : 1,(Max) 20V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2,

 

 

13V

 

 

 

 

2,

 

 

H

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3,(Min)

7V

 

 

 

 

3,(Min.)

 

 

L

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*At Output terminal P32, rectangular wave signal of 2.5kHz is output.

 

61

P21

OUT

Sound level control signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to above signal P22.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

62

P20

IN

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

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Door opened; "L" level signal(-31.0V).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

63/64

AVCC/VCC

IN

Connected to GND.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2-2 Memory IC (IC2)

AT24C04 is a 4K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 512 registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal for IC2 are as shown in the following diagram.

FUNCTIONAL DIAGRAM

 

 

TOP VIEW

 

 

 

 

 

 

 

 

 

A0

 

1

8

 

2

7

A1

 

A2

 

3

6

 

VSS

 

4

5

 

 

 

 

 

VCC

TEST

SCL

SDA

(3) Vcc

 

 

 

 

 

(4) Vss

 

 

START CYCLE

H.V. GENERATION

 

 

 

 

TIMING

 

 

 

 

 

& CONTROL

 

(5) SDA

START

 

 

 

 

 

STOP

 

 

 

 

 

LOGIC

 

 

 

 

 

CONTROL

 

 

 

 

LOGIC

 

E 2PROM

 

 

 

 

64

 

 

SLAVE ADDRESS

 

512 x 8

 

 

 

XDEC

 

(6) SCL

REGISTER

 

 

 

 

COMPARATOR

 

 

 

 

 

LOAD

INC

 

 

 

 

WORD

 

 

 

 

 

ADDRESS

 

1

64

 

 

COUNTER

 

5

 

 

 

 

 

 

 

R/W

 

3

YDEC

 

 

 

 

 

 

 

 

CK

8

 

 

PIN

 

Dout

 

 

DATA REGISTER

 

 

 

 

 

 

Dout

 

 

 

 

 

ACK

 

 

 

 

Figure T-4 Relation between Pin Nos, and Signals

20

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Image 22
Sharp R-2397 service manual Sound Voltage level control terminal

R-2397 specifications

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