BU91799KV-M Datasheet, PDF (13/29 Pages) Rohm – Low Duty LCD Segment Driver for Automotive Application

BU91799KV-M 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
Setup
Normal
All pixel ON (APON)
P1 Reset initialize condition
0
○
1
Setup
P0 Reset initialize condition
Normal
0
○
All pixel OFF (APOFF)
1
All pixels ON: All pixels are ON regardless of DDRAM data.
All pixels OFF: All pixels are OFF regardless of DDRAM data.
This command is valid in Display on status. The data of DDRAM is not changed by this command.
If set both P1 and P0 =”1”, APOFF will be selected.
EVR Set 1 (EVRSET1)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
1
0
0 P2 P1 P0
BU91799KV-M has 32-step Electrical Volume Register (EVR) that can set the best V0 voltage level (maximum LCD
driving voltage).
Electrical Volume Register (EVR) setting is shown below.
MSB
LSB
Internal register
EVR4
EVR3
EVR2
EVR1
EVR0
Command
EVRSET1 EVRSET1 EVRSET1 EVRSET2 EVRSET2
P2
P1
P0
P1
P0
Reset initialize condition
0
0
0
0
0
Electrical Volume Register (EVR) is set to “00000” in reset initialize condition.
In “00000” condition, V0 output voltage is equal to VLCD input voltage.
Refer to The Relationship of Electrical Volume Register (EVR) Setting and V0 voltage.
Keep EVR setting for V0 voltage more than 2.5V only.
EVRSET1 command defines the upper 3bit of EVR.
EVR setting is reflected by sending EVRSET1 command.
EVR Set 2 (EVRSET2)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
1
1
1
0
P1 P0
EVRSET2 command defines the lower 2bit of EVR.
EVR setting is reflected by sending by sending EVRSET2 command.
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8. Feb. 2016 Rev.001