BU9795AKS2 Datasheet, PDF (15/40 Pages) Rohm – Standard LCD Segment Drivers

BU9795Axxx Series MAX 140 segments (SEG35×COM4)
Datasheet
○OSCILLATOR
Several kinds of clock for logic and analog circuit are generated from internal oscillation circuit or external clock.
This device has internal oscillator circuit. When you use internal oscillation circuit, please connect OSCIN to VSS.
*When you use external clock, execute ICSET command and connect OSCIN to external clock.
OSCIN
BU9795AKV
/FV/GUW/KS2
VSS
OSCIN
BU9795AKV
/FV/GUW/KS2
VSS
Clock input
Figure 20. Using internal oscillator circuit
Figure 21. Using external clock
○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.
About the characteristics of fCLK, refer to Oscillation Characteristics.
○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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TSZ02201-0A0A2D300020-1-2
12.July.2012 Rev.002