LC75842 查看數據表（PDF） - SANYO -> Panasonic

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LC75842

General-Purpose 1/2 Duty LCD Display Driver

SANYO -> Panasonic 

LC75842E, LC75842M

Output Waveforms (1/2 duty, 1/2 bias drive)

COM1

COM2

VDD

1/2VDD

VSS

VDD

1/2VDD

VSS

fOSC

512

[Hz]

S1 to S27 output when LCD

VDD

segments corresponding to

COM1 are on

VSS

S1 to S27 output when LCD

VDD

segments corresponding to

COM2 are on

VSS

S1 to S27 output when LCD

VDD

segments corresponding to

both COM1 and COM2 are on

VSS

S1 to S27 output when LCD

segments corresponding to

both COM1 and COM2 are

turned off

VDD

VSS

A03198

INH and Display Control

Since the IC internal data (D1 to D54 and control data) is undefined when power is first applied, the display is turned off

(S1 to S27, COM1 and COM2 = low) by setting INH pin low at the same time as power is applied. Then, meaningless

display at the power on can be prevented by transferring all 80 bits of serial data from the controller while the display is

turned off and INH pin high after the transfer completes. (See Figure 3.)

VDD

R

INH

C

A03199

VDD

INH

CE

Internal data

t1

Display data and control data

transfer

Undefined

VIL

tc

VIL

Defined

Figure 3

t1 : Determined by the RC circuit

tc : 10 µs min.

A03200

No. 4966-8/10

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