BU9795AKS2 Datasheet, PDF (16/40 Pages) Rohm – Standard LCD Segment Drivers

BU9795Axxx Series MAX 140 segments (SEG35×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.
C : 1 : Next byte is command.
○Mode Set (MODE SET)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
0
*
P3 P2
*
*
(* : Don’t care)
Set display ON and OFF
Setting
P3 Reset initialize condition
Display OFF(DISPOFF)
0
○
Display ON(DISPON)
1
Display OFF : Regardless of DDRAM data, all SEGMENT and COMMON output will be stopped after 1 frame 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.
(Note) It is not synchronize with display frame, when it will be controlled display ON/OFF with INHb terminal.
Set bias level
Setting
1/3 Bias
1/2 Bias
Refer to LCD driving waveform.
P2 Reset initialize condition
0
○
1
○Address set (ADSET)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
0
0 P4 P3 P2 P1 P0
Address data is specified in P[4 : 0] and P2 (ICSET command) as follows.
Internal register
Bit of each command
MSB
Address [5]
ICSET [P2]
Address [4]
ADSET [P4]
・・・
・・・
The address is 00h in reset condition. The valid address is 00h to 22h.
Another address is invalid, (otherwise address will be set to 00h.)
P2 of ICSET command is only to define either MSB of address is “1” or “0”.
Address counter will be set only when ADSET command is executed.
LSB
Address [0]
ADSET [P0]
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TSZ02201-0A0A2D300020-1-2
12.July.2012 Rev.002