LC75878W 查看數據表（PDF） - ON Semiconductor

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LC75878W

1/8 to 1/10-Duty General-Purpose LCD Driver

ON Semiconductor 

LC75878W

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 S73,

S74/COM10, S75/COM9, and COM1 to COM8 to the VLCD4 level and the P1 to P4 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 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 (VDD) on  LCD driver block power supply (VLCD) on

• Power off: LCD driver block power supply (VLCD) off  Logic block power supply (VDD) off

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

t1

VDD

VLCD

INH

CE

Internal data (D1 to D120)

Undefined

Internal data (D121 to D240)

Undefined

Internal data (D241 to D360)

Undefined

Internal data (D361 to D480)

Undefined

Internal data (D481 to D600)

PC1 to PC4

Internal data CT0 to CT3, CTC

SC, BU, DT1, DT2

Undefined

Undefined

Display and control data transfer

Figure 3

t2

t3

VIL

tc

VIL

Defined

Undefined

Defined

Undefined

Defined

Undefined

Defined

Undefined

Defined

Undefined

Defined

Undefined

• t1  0

• t2 > 0

• t3  0 (t2 > t3)

• tc .... 10s min

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