BU9795AFV-LB Datasheet, PDF (8/29 Pages) Rohm – Standard LCD Segment Drivers

BU9795AFV-LB MAX 108 segments (SEG27×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.
(Note) When you use external clock, execute ICSET command and connect OSCIN to external clock.
OSCIN
BU9795AFV-LB
VSS
OSCIN
BU9795AFV-LB
VSS
Clock input
Figure 10. Internal oscillator circuit mode
Figure 11. External clock mode
LCD Driver Bias Circuit
This LSI generates LCD driving voltage with on-chip Buffer AMP.
And it can drive LCD at low power consumption.
1/3 and 1/2Bias can be set in MODESET command.
Line and frame inversion can be set in DISCTL command.
Refer to “LCD driving waveform” about each LCD driving waveform.
Blink timing generator
This device has Blinking function.
This LSI is able to set blink mode with BLKCTL command.
Blink frequency varies widely by characteristic of fCLK, when internal oscillation circuit.
Refer to Oscillation Characteristics for more details on fCLK.
Reset (initial) condition
Initial condition after execute SOFTWARE RESET is 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 (MODESET)
2 Address Set (ADSET)
3 Display Control (DISCTL)
4 Set IC Operation (ICSET)
5 Blink Control (BLKCTL)
6 All Pixel Control (APCTL)
Function
Set LCD drive mode
Set LCD display mode 1
Set LCD display mode 2
Set IC operation
Set blink mode
Set pixel condition
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26.Feb.2014 Rev.002