ML9298 データシートの表示（PDF） - Oki Electric Industry

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ML9298

12-Hour System Clock IC for 1/2 Duty Fluorescent Display Tubes

Oki Electric Industry 

OKI Semiconductor

FEDL9298-01

ML9298

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

A

FB

G

EC

D

(7 segments)

Display Device

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

Relationship Between Anode/Grid Output and Display

GR2

3a

col

4b 3f

3b

3g

GR1 2a

1a

2f

2b 1f

1b

2g

1g

4c 3e

3c

digit4

3d

digit3

col

colon

2e

2c 1e

1c

2d

digit2

1d

digit1

Brightness Switching Function

4-level brightness settings (frequency = 256 Hz, gap between GR1 and GR2 at 1/2 duty = 32 µs)

Switch pin name

DIM1

DIM2

L

L

H

L

L

H

H

H

Operating mode

f = 256 Hz, 1/2 duty (50% display)

f = 256 Hz, 1/4 duty (25% display)

f = 256 Hz, 1/8 duty (12.5% display)

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)

7/12

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