LC75833E-E Datasheet, PDF (14/19 Pages) Sanyo Semicon Device – 1/3 Duty General-Purpose LCD Display Drivers

LC75833E, 75833W, 75833JE
The INH pin and Display Control
Since the LSI 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 (LC75833E, LC75833W: This
sets the S1/P1 to S8/P8, S9 to S35, and COM1 to COM3 to the VSS level. LC75833JE: This sets the S1/P1 to S8/P8, S9
to S11, S13 to S22, S25 to S34, and COM1 to COM3 to the VSS level.) and during this 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 Figure 3.)
Notes on the Power On/Off Sequences
Applications should observe the following sequence when turning the LC75833E, LC75833W, and LC75833JE power
on and off.
• At power on: Logic block power supply (V_DD) on → LCD driver block power supply (V_LCD) on
• At power off: LCD driver block power supply (V_LCD) off → Logic block power supply (V_DD) off
However, if the logic and LCD driver block use a shared power supply, then the power supplies can be turned on and off
at the same time.
t1
V_DD
t2
t3
V_LCD
INH
CE
D1 to D36
Internal data P0 to P3
DR, SC, BU
Internal data (D37 to D72)
Internal data (D73 to D105)
Display and control data transfer
V_IL
tc
V_IL
Undefined
Defined
Undefined
Defined
Undefined
Defined
Undefined
Undefined
Undefined
Note:
t1 ≥ 0
t2 > 0
t3 ≥ 0 (t2 > t3)
tc ... 10 µs min
Note: At the LC75833JE, the display data D34 to D36, D67 to D72, D103 to D105 must be set to 0.
Figure 3
A06560
Notes on Controller Transfer of Display Data
Since the LC75833E, LC75833W, and LC75833JE accept display data divided into three separate transfer operations,
we recommend that applications transfer all of the display data within a period of less than 30 ms to prevent observable
degradation of display quality.
No. 5580-14/19