BU9795AKS2 Datasheet, PDF (19/40 Pages) Rohm – Standard LCD Segment Drivers

BU9795Axxx Series MAX 140 segments (SEG35×COM4)
Datasheet
○Set IC Operation (ICSET)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
C
1
1
0
1
P2 P1 P0
P2 : MSB data of DDRAM address. Please refer to “ADSET” command.
Setting
P2
Reset initialize condition
Address MSB’0’
0
○
Address MSB’1’
1
Set Software Reset condition
Setting
P1
No operation
0
Software Reset
1
When “Software Reset” is executed, this LSI will be reset to initial condition.
If software reset is executed, the value of P2 and P1 will be ignored and they will be set initialized condition. (Refer
to “Reset initial condition”)
Switch between internal clock and external clock.
Setting
P0
Reset initialize condition
Internal clock
0
○
External clock input
1
For internal clock
: OSCIN is connected to VSS.
For external clock input : Input external clock into OSCIN.
<external Clock Frame frequency calculation>
DISCTL 80Hz select : Frame frequency [Hz] = external clock[Hz] / 512
DISCTL 71Hz select : Frame frequency [Hz] = external clock[Hz] / 576
DISCTL 64Hz select : Frame frequency [Hz] = external clock[Hz] / 648
DISCTL 53Hz select : Frame frequency [Hz] = external clock[Hz] / 768
Command
ICSET
OSCIN_EN
(Internal signal)
Internal oscillation
(Internal signal)
External clock
(OSCIN)
Internal clock mode
External clock mode
Figure 23. OSCMODE switching timing
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TSZ02201-0A0A2D300020-1-2
12.July.2012 Rev.002