HT1647 datasheet(14/24 Pages) HOLTEK

14 / 24 page

HT1647

April 21, 2000

V LC D

VS S

1/ 5 bi as

VS S

1/ 4 bi as

VD D

VL C D

VD D

VL C D

* T h e v o l t age appl i e d t o V LC D p i n m u s t b e l o w e r th a n V DD

* A d j u s t V R to fi t L C D d i s p l a y , a t V DD = 5 V , V LC D = 4 V , V R = 1 5 k W

2 0 %

V LC D

Internal resistor type bias generator configurations

The following are the data mode ID and the

command mode ID:

Operation

Mode

READ

Data

110

WRITE

Data

101

READ-MODIFY-WRITE

Data

101

COMMAND

Command

100

If successive commands have been issued, the

command mode ID can be omitted. While the

system is operating in the non-successive com-

mand or the non-successive address data mode,

the CS pin should be set to ²1² and the previous

operation mode will also be reset. The CS pin

returns to ²0², so a new operation mode ID

should be issued first.

Bias generator

The HT1647 bias voltage belong to internal re-

sistor type. It provides two kinds of bias option

named 1/5 bias and 1/4 bias respectively. It is

recommeaded to select 1/5 bias to fit TN-type,

STN-type LCDs and select 1/4 bias to fit

ECB-type LCDs. It also provides three kinds of

bias current option by programming to suitably

drive LCD panel. The three kinds of bias cur-

rent are large, middle, and small, respectively.

Usually, large panel LCD can be excellently dis-

played by large bias current. Relatively, it con-

sumes large current when LCD ON command is

used. Small bias current provides low power

consumption during on condition when the

LCD is normally displayed. The following are

the reference value table.

VLCD

Bias

Large bias current

Middle bias current

Small bias current

1/5

300mA

100mA40mA

1/4

375mA

125mA50mA

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