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參數(shù)資料
| 型號： | AS2591 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 顯示驅動器 |
| 英文描述： | 16-Digit LCD Driver CMOS Integrated Circuit |
| 中文描述： | LIQUID CRYSTAL DISPLAY DRIVER, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大小： | 74K |
| 代理商： | AS2591 |
Preliminary
AS2591
Rev. 1.0
Page 5
May 1999
Functional Description
AS2591 is a CMOS mixed-mode integrated circuit for
driving LCDs with 4 backplanes and 24 or 31
segments providing 12 or 16 7-segment digits and 12
symbols. The device is controlled via a simple 2-wire
bus and a chip-select signal. The device also
includes an elapse-time counter which is started 5
seconds after power-up and incremented every
second.
The timer is re-started whenever the device gets a
WRITE-DIGIT or SHIFT&WRITE command within the
first 5 counts (except commands for displaying digits
"
-
", "
second after receiving the last WRITE-DIGIT,
SHIFT&WRITE or BLINKING command. The normal
display appears immediately after receiving a WRITE-
DIGIT, SHIFT&WRITE, or BLINKING command.
o
", "
o
"). The content of the timer is displayed 5
Supply Arrangement
The device is supplied through V
. The internal
reference voltages (V
, V
, and V
) for the backplane
and segment outputs are set at pin V
. With V
set
to 3.27V the segment output voltage is 2.97V
(middle).
This voltage can be programmed through the serial
bus to 2.83V (low) or 3.09V (high) for optimising the
contrast of the LCD. The 1/3, 2/3, and 3/3 voltages
are generated internally (see Figure 4: Supply
arrangement). In applications with varying V
, it is
recommended to insert a voltage regulator at V
in
order to assure a constant contrast (see also
application note AN525 for further information).
V
DD
V
SS
From
AS2525
V
LCD
V
DD
V
33
Contrast
control
V
23
V
13
Contrast
control
Figure 4: Supply arrangement
LCD Digit Code
Code [HEX]:
Number:
01
1
02
2
_
_|
|_
03
3
_
_|
_|
04
4
05
5
_
|_
_|
06
6
_
|_
|_|
07
7
_
|
|
08
8
_
|_|
|_|
09
9
_
|_|
_|
00
0
_
| |
|_|
Display:
|
|
|_|
|
Code [HEX]:
Letters/Signs:
0A
a
_
|_|
| |
0B
b
0C
c
0D
d
0E
e
_
|_
|_
0F
f
_
|_
|
10
#
_
_
_
11
*
12
-
13
(
_
|
|_
14
)
_
|
_|
Display:
|_
|_|
_
|_
_|
|_|
|_
|
_
Code [HEX]:
Letters/Signs:
15
H
16
I
17
L
18
N
19
O
1A
P
_
|_|
|
1B
R
1C
T
1D
U
1E
"
_
|_|
1F
Display:
|_|
| |
|
|
|_
_
| |
_
|_|
_
|
|_
|_
|_|
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