BU9799KV Datasheet, PDF (8/28 Pages) Rohm – Standard LCD Segment Driver

BU9799KV MAX 200 segments (SEG50×COM4)
Datasheet
○OSCILLATOR
There are two kinds of clock for logic and analog circuit; from internal oscillator circuit or external clock input. If internal
oscillator circuit will be used, OSCIN must be connected to VSS.
*When using external clock mode, it has to input external clock from OSCIN terminal after ICSET command setting.
OSCIN
BU9799KV
VSS
OSCIN
BU9799KV
VSS
Clock
Figure 10. Internal oscillator circuit mode
Figure 11. External clock input mode
○ LCD Driver Bias Circuit
This device generates LCD driving voltage with on-chip Buffer AMP.
And it can drive LCD at low power consumption.
*1/3 and 1/2Bias can set in MODESET command.
*Line and frame inversion can set in DISCTL command.
Refer to the “LCD driving waveform” about each LCD driving waveform.
○ Blink timing generator
This device has Blink function.
* This device will be at Blink mode with BLKCTL command.
Blink frequency varies widely by characteristic of fCLK, when internal oscillator circuit is used.
Refer to Oscillation Characteristics for more details on fCLK.
○ Reset initialize condition
Initial conditions after execution of Software Reset are as follows.
・Display is OFF.
・DDRAM address is initialized (DDRAM Data is not initialized).
Refer to Command Description about initialize value of register.
●Command / Function List
Description List of Command / Function
No.
Command
1 Mode Set (MODE SET)
2 Address set (ADSET)
3 Display control (DISCTL)
4 Set IC Operation (ICSET)
5 Blink control (BLKCTL)
6 All Pixel control (APCTL)
7 EVR Set 1 (EVRSET1)
8 EVR Set 2 (EVRSET2)
Function
Set LCD drive mode
Set LCD display mode 1
Set LCD display mode 2
Set IC operation
Set Blink mode
Set pixel condition
Set EVR 1
Set EVR 2
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23.Jan.2015 Rev.003