FEDL9298-01
OKI Semiconductor
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
F
G
E
D
C
B
(7 segments)
Display Device
Dynamic drive 4-digit fluorescent display tube (with colon)
Relationship Between Anode/Grid Output and Display
GR2
4b
3f
3a
col
3g
3b
2f
2g
2b
1f
1b
1g
1c
1d
digit1
GR1
2a
1a
4c
3e
3d
digit3
3c
col
2e
2d
digit2
2c 1e
digit4
colon
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
L
H
L
H
DIM2
L
L
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
OKI [ OKI ELECTRONIC COMPONETS ]
