FEDL9298-01 Datasheet, PDF (7/12 Pages) List of Unclassifed Manufacturers – 12-Hour System Clock IC for 1/2 Duty Fluorescent Display Tubes

LAPIS 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
digit4
3e
3c
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 s)
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)
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