參數(shù)資料
型號： UPD17201A
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS
中文描述： 4位單片機與LCD控制器/驅(qū)動器和A / D轉(zhuǎn)換器紅外遙控遞質(zhì)
文件頁數(shù)： 67/120頁
文件大小： 516K
代理商： UPD17201A
μ
PD17201A, 17207
67
11.5
SEGMENT SIGNALS AND COMMON SIGNALS
Segment pins LCD
0
to LCD
35
are connected to the corresponding front electrodes of the LCD panel and common
pins COM
0
to COM
3
are connected to corresponding rear electrodes of the LCD panel. The LCD panel lights when
the potential difference between its segment and common signals goes beyond a preset voltage.
The LCD panel is driven on an AC voltage because it degrades quickly if a DC voltage is continuously applied
between its segment and common pins.
Figure 11-8 to Fig. 11-10 shows waveforms of segment and common signals in each display mode.
Fig. 11-8 Common and Segment Waveforms in Each Display Mode (for LCDEN = 1)
[Mode 1]
Display mode
[Mode 2]
[Mode 3]
V
LCD2
V
LCD1
V
LCD0
GND
COM pin
0
COM
1
pin
COM
2
pin
COM
3
pin
LCD
n
pin
COM
0
-LCD
n
Segment pin
(LCD
25
)
Segment pin
(LCD
24
)
Segment pin
(LCD
24
)
GND
GND
GND
GND
+ V
LCD2
+ V
LCD1
+ V
LCD0
GND
_ V
LCD2
_ V
LCD1
_ V
LCD0
1
: The LCD stripe lights here (by an LCD selection voltage).
1
1
1
1
1
V
LCD2
V
LCD1
V
LCD0
V
LCD2
V
LCD1
V
LCD0
V
LCD2
V
LCD1
V
LCD0
V
LCD2
V
LCD1
V
LCD0
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