LC75847T(2013) 查看數據表（PDF） - ON Semiconductor

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LC75847T
(Rev.:2013)

1/3, 1/4 Duty General-Purpose LCD Driver

ON Semiconductor 

LC75847T

The INH pin and Display Control

Since the IC internal data (1/3 duty: the display data D1 to D318 and the control data, 1/4 duty: the display data D1 to

D420 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 S8/P8, S9 to S105, COM1 to COM3, and

COM4/S106 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 and 4.)

Notes on the Power On/Off Sequences

Applications should observe the following sequences when turning the LC75847T power on and off.

• 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.

• 1/3 duty

t1

VDD

t2

t3

VLCD

INH

CE

D1 to D108,

Internal data P0 to P3, CT0 to CT2,

DR, DT, FC, SC, BU

Internal data (D109 to D213)

Display and control data transfer

Undefined

VIL

tc

VIL

Defined

Undefined

Defined

Undefined

Undefined

Internal data (D214 to D318)

Undefined

Figure 3

Defined

Undefined

Notes:

t1 ≥ 0

t2 > 0

t3 ≥ 0 (t2 > t3)

tc .......10µs min.

No. 7389-21/27

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