BU9910KV Datasheet, PDF (12/15 Pages) Rohm – Status display LCD driver for PCs with I2C Bus interface

Multimedia ICs
BU9910KV
Blink control memory: SEG vs. COM(COM No. / SEG No.)
Base Address
bit7
bit6
bit5
bit4
0110b
3/1
2/1
1/1
0/1
0111b
3/3
2/3
1/3
0/3
1000b
3/5
2/5
1/5
0/5
1001b
3/7
2/7
1/7
0/7
1010b
3/9
2/9
1/9
0/9
1011b
0
0
0
0
bit3
3/0
3/2
3/4
3/6
3/8
3 / 10
bit2
2/0
2/2
2/4
2/6
2/8
2 / 10
bit1
1/0
1/2
1/4
1/6
1/8
1 / 10
bit0
0/0
0/2
0/4
0/6
0/8
0 / 10
3) Direct drive input description
Direct input pin vs.SEG / COM
COM0
COM1
COM2
COM3
SEG6
DIN0
DIN1
DIN2
DIN3
SEG7
DIN4
DIN5
DIN6
DIN7
SEG8
DIN8
DIN9
DIN10
DIN11
SEG9
DIN12
DIN13
DIN14
DIN15
SEG10
DIN16
DIN17
DIN18
DIN19
In the test mode, the specified lighting is carried out regardless of the state of the segment data register. Setting pins
to the open state returns to the normal state without carrying out a reset.
Holding time setting(when activate the direct input pins)
HT1 HT0
Holding time
L
L 0.125s Ϲ HT < 0.156s
L
H 0.250s Ϲ HT < 0.313s
H
L 0.500s Ϲ HT < 0.625s
H
H 1.000s Ϲ HT < 1.250s
At fosc = 32.768kHz
4) LCD device test terminal description
LCD device test pins setting table
LCDT1 LCDT0
Lighting conditions
L
L
Test mode : All cells are turned on
L
H Test mode : 10100101b (set all Segment Data Memory)
H
L
Test mode : 01011010b (set all Segment Data Memory)
H
H Normal: Controlled by the LCD display memory
When these pins are low, the Segment data memory are ignored.
Each of LCDT1 and LCDT2 has a pull-up resister.
When these pins are open, return to nomal operation without reset.
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