參數(shù)資料
型號(hào)： ST624XB-KIT
英文描述： STARTER KIT DATASHEET FOR ST624X
中文描述： 入門套件小冊(cè)子的ST624X
文件頁(yè)數(shù)： 49/74頁(yè)
文件大?。?/td> 733K
代理商： ST624XB-KIT
49/74
ST62T46B/E46B
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 16
.
Table 16. 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 a higher multiplexing ratio is set, refreshment
frequency is decreased accordingly (
Table 17
).
Table 17. 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 used in 1/2 mode is obtained by exter-
nal connection of the 1/3VLCD and 2/3VLCD pins
(
Figure 26
).
Figure 26. Bias Config for 1/2 Duty
Figure 27. Typical Current consumption on
VLCD Pin (25°C, no load, fLCD=512Hz, mux=1/3-
1/4)
Note
: For display voltages V
LCD
< 4.5V the resis-
tivity of the divider may be 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 DS0
0
0
1
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
0
1
0
1
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
I
LCD
(μA)
V
LCD
(V)
VR01838
70
60
50
40
30
20
10
3
4
5
6
7
8
9
10
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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ST6252 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, AUTO-RELOAD TIMER AND EEPROM
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ST6252BB1/XXX 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
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