ml9289 Oki Semiconductor, ml9289 Datasheet - Page 20

• Manufacturer Part Number: ml9289
• Description: Vacuum Fluorescent Display Tube Controller Driver
• Manufacturer: Oki Semiconductor

4. “Display duty set” command
For display duty, brightness can be adjusted in 16 stages using 4-bit data.
When power is turned on or when the RESET signal is input, the duty cycle register value is “0”. Always
execute this command before turning the display on, then set a desired duty value.
[Command format]
[Relation between setup data and controlled COM duty]
* The state when power is turned on or when the RESET signal is input.
1st byte
(Writes display duty value into the duty cycle register.)
HEX
0
1
2
3
4
5
6
7
LSB
B0 B1 B2 B3 B4 B5 B6 B7
D0 D1 D2 D3 1
D0 (LSB) to D3 (MSB) : Display duty data (4 bits: 16 stages worth)
D0
0
1
0
1
0
1
0
1
D1
0
0
1
1
0
0
1
1
D2
0
0
0
0
1
1
1
1
0
1
D3
0
0
0
0
0
0
0
0
MSB
0
COM duty
: setup and duty value in display duty specification mode are
specified.
0/16
1/16
2/16
3/16
4/16
5/16
6/16
7/16
HEX
A
B
C
D
E
8
9
F
D0
0
1
0
1
0
1
0
1
D1
0
0
1
1
0
0
1
1
D2
0
0
0
0
1
1
1
1
D3
1
1
1
1
1
1
1
1
COM duty
FEDL9289-01
10/16
11/16
12/16
13/16
14/16
15/16
ML9289-xx
8/16
9/16
20/31