lc75838e Sanyo Semiconductor Corporation, lc75838e Datasheet - Page 25

• Manufacturer Part Number: lc75838e
• Description: 1/8 To 1/10 Duty General-purpose Lcd Display Drivers
• Manufacturer: Sanyo Semiconductor Corporation

The INH Pin and Display Control
Since the IC internal data (the display data and the control data) is undefined when power is first applied, applications
should set the INH pin low at the same time as power is applied to turn off the display (This sets the S1 to S38,
S39/COM10, S40/COM9, and COM1 to COM8 to the V
period send serial data from the controller. The controller should then set the INH pin high after the data transfer has
completed. This procedure prevents meaningless displays at power on. (See figures 3, 4, and 5.)
Power Supply Sequence
The following sequences must be observed when power is turned on and off. (See figures 3, 4, and 5.)
• Power on :Logic block power supply(V
• Power off:LCD driver block power supply(V
However, if the logic and LCD driver blocks use a shared power supply, then the power supplies can be turned on and off
at the same time.
• 1/8 duty
Internal data (D1 to D80)
Internal data (D81 to D160)
Internal data (D161 to D240)
Internal data (D241 to D320)
Internal data PC1 to PC3
CT0 to CT3, CTC
SC, BU, DT1, DT2
V
V
INH
CE
DD
LCD
Undefined
Undefined
Undefined
Undefined
Undefined
DD
) on
t1
LCD
LC75838E, 75838W
) off
Display and control data transfer
LCD driver block power supply(V
Figure 3
LCD
Logic block power supply(V
4 level and the P1 to P3 to the V
LCD
VIL
Defined
Defined
Defined
Defined
Defined
tc
DD
) on
) off
VIL
SS
level.) and during this
t2
• t1 ≥ 0
• t2 > 0
• t3 ≥ 0 (t2 > t3)
• tc • • • 10 µs min
t3
Undefined
Undefined
Undefined
Undefined
Undefined
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