LC75835W Datasheet, PDF (28/35 Pages) Sanyo Semicon Device – CMOS IC 1/3, 1/4-Duty General-Purpose LCD Display Driver

The INH pin and Display Control
LC75835W
Since the IC internal data (1/4 duty: the display data D1 to D272 and the control data, 1/3 duty: the display data D1 to
D210 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/P1 to S16/P16, S17 to S34, COM1 to COM3, and
COM4/S35 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
Figures 5 and 6.)
Notes on the Power On/Off Sequences
Applications should observe the following sequences when turning the LC75835W power on and off.
(See Figures 5 and 6)
• At power on: Logic block power supply (VDD) on → LCD driver block power supply (VLCD) on
• At power off: LCD driver block power supply (VLCD) off → Logic block power supply (VDD) 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.
1. 1/4 duty
t1
VDD
t2
t3
VLCD
INH
CE
PC1 to PC16,PS1 to PS16,
Internal data PZ0 to PZ4,PZF,DR,DT,OC,
FC0,FC1,BF0,BF1,SC,BC,BU
Internal data (D1 to D24)
Undefined
Undefined
Display data and control data transfer
VIL1
tc
VIL1
Defined
Defined
Undefined
Undefined
Internal data (D25 to D48)
Undefined
Defined
Undefined
Internal data (D241 to D256)
Internal data (D257 to D272)
Undefined
Undefined
Figure 5
Defined
Defined
Undefined
Undefined
Note: t1≥0
t2>0
t3≥0 (t2>t3)
tc⋅⋅⋅10µs min
No.A0429-28/35