BU9799KV Datasheet, PDF (9/28 Pages) Rohm – Standard LCD Segment Driver

BU9799KV MAX 200 segments (SEG50×COM4)
Datasheet
●Detailed command description
D7 (MSB) is bit for command or data judgment.
Refer to Command and data transfer method.
C: 0: Next byte is RAM write data.
1: Next byte is command.
○Mode Set (MODE SET)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
0
0
P3 P2
*
*
( * : Don’t care)
Set display ON and OFF
Setting
P3
Display OFF
0
Display ON
1
Reset initialize condition
○
Display OFF : Regardless of DDRAM data, all SEGMENT and COMMON output will be stopped after 1frame off
data write. Display OFF mode will be finished by Display ON.
Display ON : SEGMENT and COMMON output will be active and start to read the display data from DDRAM.
Set bias level
setup
P2
1/3 Bias
0
1/2 Bias
1
Refer to LCD driving waveform
Reset initialize condition
○
○Address set (ADSET)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
0
0 P4 P3 P2 P1 P0
It is set address as follows;
Internal register
command
MSB
Address [5]
ICSET [P2]
Address [4]
ADSET [P4]
・・・
・・・
LSB
Address [0]
ADSET [P0]
The range of address can be set as 00000 to 10001(2).
Don’t set out of range address, otherwise address will be set 00000.
ICSET command is only define MSB bit of address, not set the address of DDRAM.
If want to set the address of DDRAM, it has to be input ADSET command.
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23.Jan.2015 Rev.003