BU9799KV Datasheet, PDF (12/28 Pages) Rohm – Standard LCD Segment Driver

BU9799KV MAX 200 segments (SEG50×COM4)
○All Pixel control (APCTL)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
1
1
1
1
P1 P0
All display set ON, OFF
APON
P1
Normal
0
All pixel ON
1
Reset initialize condition
○
APOFF
P0 Reset initialize condition
Normal
0
○
All pixel OFF
1
All pixels ON : All pixels are ON regardless of DDRAM data
All pixels OFF : All pixels are OFF regardless of DDRAM data
(Note) This command is valid in Display on status.
The data of DDRAM don’t change by this command. If set both P1 and P0 =”1”, APOFF will be select.
○EVR Set 1(EVRSET1)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
1
0
0 P2 P1 P0
It is able to control 32-step Electrical Volume Register (EVR).
It is able to set V0 voltage level (the max level voltage of LCD driving voltage).
It is set electrical volume register as follows;
MSB
EVR4
EVRSET1
P2
EVR3
EVRSET1
P1
EVR2
EVRSET1
P0
EVR1
EVRSET2
P1
LSB
EVR0
EVRSET2
P0
0
0
0
0
0
Reset initialize condition
Electrical Volume Register (EVR) is set “00000” in reset initialize condition
In “00000” condition, V0 voltage output VLCD voltage.
Please refer to next page about V0 output voltage.
It is prohibited the EVR setting that V0 voltage will be under 2.5V.
EVRSET1 is defined the upper 3bit of electrical volume register.
It will be set the electrical volume register by this command (EVRSET1) input.
○EVR Set 2(EVRSET2)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
1
1
1
0
P1 P0
EVRSET2 is defined the lower 2bit of electrical volume register.
It will be set the electrical volume register by this command (EVRSET2) input.
Datasheet
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