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| 型號： | ST62E40B |
| 廠商： | 意法半導體 |
| 元件分類： | DRAM |
| 英文描述： | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| 中文描述： | 該CAT24FC02是一個2 KB的EEPROM的國內(nèi)256個8位每字舉辦的串行CMOS |
| 文件頁數(shù)： | 49/72頁 |
| 文件大小： | 445K |
| 代理商： | ST62E40B |
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49
ST62T40B/E40B
LCD CONTROLLER-DRIVER (Continued)
4.5.1 Multiplexing ratio and frame frequency
setting
Up to 4 common plates COM1..COM4 can be
used for multiplexing ratio ranging from 1/1 to 1/4.
The selection is made by the bits DS0 and DS1 of
the LCDCR as shown in the Table 20.
Table 20. Multiplexing ratio
If the 1/1 multiplexing ratio is chosen, LCD seg-
ments are refreshed with a frame frequency Flcd
derived from 32KHz clock with a division ratio de-
fined by the bits LF0..LF2 of the LCDCR.
When ahighermultiplexingratiois set,refreshment
frequency is decreased accordingly (Table 21).
Table 21. LCD Frame Frequency Selection
4.5.2 Segment and common plates driving
LCD panels physical structure requires precise
timings and stepped voltage values on common
and segment outputs. Timings are managed by
the LCD controller, while voltages are derivated
from the VLCD value through internal resistive di-
vision. This internal divider is disabled when the
LCD driver is OFF in order to avoid consumption
on VLCD pin.
The 1/3 VLCD and 2/3 VLCD values used in 1/1,
1/3 and 1/4 multiplexing ratio modes are internally
generated and issued on external pins, while 1/2
VLCD value usedin 1/2mode is obtained by exter-
nal connection of the 1/3VLCD and 2/3VLCD pins
(Figure 27).
Figure 27. Bias Config for 1/2 Duty
Figure 28. Typical Current consumption on
VLCDPin(25
°
C,noload,fLCD=512Hz,mux=1/3-
1/4)
I
LCD
(
μ
A)
Note
: For display voltages V
LCD
< 4.5V the resis-
tivity of the divider maybe too high for some appli-
cations (especially using 1/3 or 1/4 duty display
mode). In that case an external resistive divider
must be used to achieve the desired resistivity.
DS1
0
0
1
1
DS0
0
1
0
1
Display Mode
1/4 mux.ratio
1/1 mux.ratio
1/2 mux.ratio
1/3 mux.ratio
Active backplanes
COM1, 2, 3, 4
COM1
COM1, 2
COM1, 2, 3
LF2
LF1
LF0
Base
f
LCD
(Hz)
Frame Frequency f
F
(Hz)
1/1
mux.
ratio
ratio
64
32
85
43
128
64
171
85
256
128
341
171
512
256
Reserved
1/2
mux.
1/3
mux.
ratio
21
28
43
57
85
114
171
1/4
mux.
ratio
16
21
32
43
64
85
128
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
64
85
128
171
256
341
512
V
LCD
V
LCD1/3
V
SS
V
LCD2/3
R
H
R
H
R
H
LCDOFF
VR01367
V
LCD
(V)
VR01838
70
60
50
40
30
20
10
3
4
5
6
7
8
9
10
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