BU9794AKV Datasheet, PDF (10/26 Pages) Rohm – Standard LCD Segment Driver

BU9794AKV MAX 200 Segments (SEG50×COM4)
○Display Control (DISCTL)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
0
1
P3 P2 P1 P0
Set bias level
setup
P3
1/3 Bias
0
1/2 Bias
1
*Refer to LCD driving waveform.
Set oscillator mode
setup
P2
Internal oscillation
0
External clock input 1
Reset initialize condition
○
Reset initialize condition
○
Internal oscillation: Must be connected to VSS.
External clock input: Input external clock from OSCIN terminal
<Frame frequency Calculation at external clock mode>
DISCTL 80Hz setting: Frame frequency [Hz] = external clock [Hz] / 512
DISCTL 71Hz setting: Frame frequency [Hz] = external clock [Hz] / 576
DISCTL 64Hz setting: Frame frequency [Hz] = external clock [Hz] / 648
DISCTL 53Hz setting: Frame frequency [Hz] = external clock [Hz] / 768
Command
DISCTL
OSCIN_EN
(internal)
INT oscillation
(internal)
Internal OSC mode
External clock mode
EXT clock
(OSCIN)
Figure 12. OSCMODE change timing
Set Frame frequency
Setup
P1 P0 Reset initialize condition
80Hz
0
0
○
71Hz
0
1
64Hz
1
0
53Hz
1
1
(Note) The setting of the frame frequency, LCD waveform, and Power save mode will influence the following display image qualities.
Please select most suitable value from current consumption and display image quality with LCD panel.
Mode
Frame frequency
LCD waveform
Power save mode
Flicker
○
○
-
Image quality, contrast
-
○
○
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10.Apr.2015 Rev.004