HT1647(2000) 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT1647 Datasheet PDF : 24 Pages
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HT1647
Name
FRAME 170Hz
FRAME 89Hz
Command Code
X100-0001-1000-XXXX
X100-0001-1101-XXXX
Function
Select 170Hz frame frequency and active segment
signal width can be divided into 13 sections
Select 89Hz frame frequency and active segment sig-
nal width can be divided into 24 sections
Frame frequency selection command code
factory gray scale in every level. HT1647 provides
5-bit PWM data to control the length of the sec-
tion. In other words, a max. 24 gray scales are gen-
erated by 5-bit binary PWM data. At FRAME
89Hz mode, the HT1647 only provides a max. of
24 adjustable gray scales although 32 is the ex-
pressed max. value by 5 bits binary code. When 5
bits binary code value is more than 23, the PWM
control circuit uniformly regards 23. To increase
PWM data indicates to increase the length of the
active segment signal. The varied length of the ac-
tive segment signal displays varied gray scale in
TN-type, STN-type LCDs (refer to table 1). Simi-
larly, it displays varied color in ECB-type LCDs.
The color display is derived from ECB-type LCD
specification. At FRAME 170Hz mode, the
HT1647 only provides a max. of 13 adjustable
gray scales although 32 is the expressed max.
value by 5 bits binary code. When the 5 bits bi-
nary code value is more than 12, the PWM con-
trol circuit uniformly regards 12. The user must
appoint four kinds of PWM data to four kinds of
different gray scale level by commanding PWM
data (refer to table 2).
Name
Command Code
Function
GRS LEVEL 1 X100-001 B4-B3 B2 B1 B0-XXXX Set PWM data in gray scale level 1
GRS LEVEL 2 X100-010 B4-B3 B2 B1 B0-XXXX Set PWM data in gray scale level 2
GRS LEVEL 3 X100-011 B4-B3 B2 B1 B0-XXXX Set PWM data in gray scale level 3
GRS LEVEL 4 X100-100 B4-B3 B2 B1 B0-XXXX Set PWM data in gray scale level 4
Four kinds of gray scale level command code
11
April 21, 2000
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