BU9794KV Datasheet, PDF (16/23 Pages) Rohm – For 200 Segment type LCD LCD Segment Driver

○ 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
Normal
All pixel OFF
P0 Reset initialize condition
0
○
1
○ 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
LSB
EVR4 EVR3 EVR2 EVR1 EVR0
EVRSET1 EVRSET1 EVRSET1 EVRSET2 EVRSET2
P2
P1
P0
P1
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.
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