BU9797FUV-M Datasheet, PDF (10/28 Pages) Rohm – Integrated Buffer AMP for LCD Driving

BU9797FUV-M MAX 144 segments (SEG36×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.
BU9797
OSCIN
VSS
BU9797
OSCIN
VSS
Clock
Figure 10. Internal oscillator circuit mode
Figure 11. 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 Set IC Operation (ICSET)
2 Display control (DISCTL)
3 Address set (ADSET)
4 Mode set (MODESET)
5 Blink control (BLKCTL)
6 All pixel control (APCTL)
Function
Software reset, internal/external clock setting
Frame frequency, power save mode setting
DRAM address setting (00h to 23h)
Register address setting (24 to 25h)
Display on/off,1/2bias,1/3bias
Blink off/0.5s/1s/2s/3s/5s blink setting
All pixels on/off during DISON
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TSZ02201-0P4P0D300430-1-2
26.Aug.2013 Rev.001