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參數(shù)資料
| 型號： | MM5452 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Liquid Crystal Display Drivers |
| 中文描述： | 液晶顯示驅(qū)動器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 190K |
| 代理商： | MM5452 |
Functional Description
(Continued)
TL/F/6137–7
*
The minimum recommended value for R for the oscillator input is 9 k
X
. An RC time constant of approximately
4.91
c
10
b
4
should produce a backplane frequency between 30 Hz and 150 Hz.
FIGURE 6. Parallel Backplane Outputs
TL/F/6137–8
FIGURE 7. External Backplane Clock
Figure 8 shows a four wire remote display that takes advan-
tage of the device’s serial input to move many bits of display
information on a few wires.
USING AN EXTERNAL CLOCK
The MM5452/MM5453 LCD Drivers can be used with an
externally supplied clock, provided it has a duty cycle of
50%. Deviations from a 50% duty cycle result in an offset
voltage on the LCD. InFigure 7, a flip-flop is used to assure
a 50% duty cycle. The oscillator input is grounded to pre-
vent oscillation and reduce current consumptions in the
chips. The oscillator is not used.
Using an external clock allows synchronizing the display
drive with AC power, internal clocks, or DVM integration
time to reduce interference from the display.
Figure 9 is a general block diagram that shows how the
device’s serial input can be used to advantage in an analog
display. The analog voltage input is compared with a stair-
case voltage generated by a counter and a digital-to-analog
converter or resistor array. The result of this comparison is
clocked into the MM5452, MM5453. The next clock pulse
increments the staircase and clocks the new data in.
With a buffer amplifier, the same staircase waveform can be
used for many displays. The digital-to-analog converter
need not be linear; logarithmic or other non-linear functions
can be displayed by using weighted resistors or special
DACs. This system can be used for status indicators, spec-
trum analyzers, audio level and power meters, tuning indica-
tors, and other applications.
6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MM5452N | Liquid Crystal Display Drivers |
| MM5452V | Liquid Crystal Display Drivers |
| MM5453 | Liquid Crystal Display Drivers |
| MM5453N | Liquid Crystal Display Drivers |
| MM5453V | Liquid Crystal Display Drivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MM5452_01 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Liquid Crystal Display Drivers |
| MM5452N | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MM5452N | 制造商:Texas Instruments 功能描述:LCD DRIVER 33 SEGMENT 5452 DIP40 |
| MM5452N/NOPB | 功能描述:LCD 驅(qū)動器 LIQUID CRYSTAL DISPLAY DRIVER RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MM5452V | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
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