FEDL9298-01

LAPIS Semiconductor

ML9298

7/12

FUNCTIONAL DESCRIPTION

Time Base

Built-in 4.194304MHz crystal oscillation circuit (AMP, feedback resistor)

* Keep crystal and external capacitors as close to this LSI as possible to minimize connection wiring.

* The values of external components, such as crystal and capacitors, should be determined including capacitance

of user's circuit boards. It is recommended to contact a crystal manufacturer.

7-Segment Display Format

Display Device

Dynamic drive 4-digit fluorescent display tube (with colon)

Relationship Between Anode/Grid Output and Display

Brightness Switching Function

4-level brightness settings (frequency 256 Hz, gap between GR1 and GR2 at 1/2 duty 32 s)

Switch pin name

DIM1

DIM2

Operating mode

L

L

f = 256 Hz, 1/2 duty (50

 display)

H

L

f = 256 Hz, 1/4 duty (25

 display)

L

H

f = 256 Hz, 1/8 duty (12.5

 display)

H

H

f = 256 Hz, 1/16 duty (6.25

 display)

Display Mode

4-digit hour and minute display in 12-hour system

Hour display ·················· 1 to 12

Minute display ············ 00 to 59

No time display when the most significant digit is 0 (Most Significant Digit Zero Suppress function)

A

B

C

D

E

F

G

(7 segments)

GR2

GR1

2c

digit2

2f

2a

2g

2d

2e

2b

col

col

colon

3f

3a

3g

3d

3e

3b

3c

digit3

4b

4c

digit4

1f

1a

1g

1d

1b

1c

digit1

1e