BU9796AFS-E2 Datasheet, PDF (12/32 Pages) Rohm – Standard LCD Segment Driver

BU9796Axxx Series MAX 80 segments (SEG20×COM4)
Datasheet
○OSCILLATOR
The clock signals for logic and analog circuit can be generated from internal oscillator or external clock. If internal
oscillator circuit is used, OSCIN must be connected to VSS level.
*When using external clock mode, input external clock from OSCIN terminal after ICSET command setting.
OSCIN
BU9796A
VSS
OSCIN
BU9796A
VSS
Clock
Figure 13. Internal oscillator circuit mode
Figure 14. Ext 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 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 initialize 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 Display Control (DISCTL)
2 Mode Set (MODESET)
3 Address Set (ADSET)
4 Set IC Operation (ICSET)
5 Blink Control (BLKCTL)
6 All Pixel Control (APCTL)
Function
Set LCD display mode 1
Set LCD drive mode
Set LCD display mode 2
Set IC operation
Set blink mode
Set pixel condition
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TSZ02201-0A2A0D300100-1-2
13.Jun.2014 Rev.003