BU9794AKV Datasheet, PDF (9/26 Pages) Rohm – Standard LCD Segment Driver

BU9794AKV MAX 200 Segments (SEG50×COM4)
●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 (MODESET)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
0
0
P3 P2 P1 P0
Set display ON and OFF
Setting
P3 Reset initialize condition
Display OFF
0
○
Display ON
1
Display OFF: Regardless of DDRAM data, all SEGMENT and COMMON output will be stopped after 1frame of
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 LCD drive waveform
Setup
P2 Reset initialize condition
Line inversion
0
○
Frame inversion
1
*Refer to LCD driving waveform.
Set Power save mode
Setup
P1 P0
Power save mode 1
0
0
Power save mode 2
0
1
Normal mode
1
0
High power mode
1
1
*Please use VLCD3.0V at High power mode.
Reset initialize condition
○
(Reference current consumption data)
Setup
Current consumption
Power save mode 1
×0.5
Power save mode 2
×0.67
Normal mode
×1.0
High power mode
×1.8
*Above data is reference. It depends on Panel load.
○Address Set (ADSET)
MSB
D7 D6 D5 D4 D3 D2
C
0 P5 P4 P3 P2
The address can be set from 00h to 31h.
Address beyond this range will be set at 00h.
At reset condition, the address is set to 00h.
LSB
D1 D0
P1 P0
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10.Apr.2015 Rev.004