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参数资料
| 型号： | MM58342V |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 显示驱动器 |
| 英文描述： | MM58342 High Voltage Display Driver |
| 中文描述： | VACUUM FLUOR DISPLAY DRIVER, PQCC28 |
| 封装： | PLASTIC, CC-28 |
| 文件页数： | 4/7页 |
| 文件大小： | 165K |
| 代理商： | MM58342V |
Functional Description
(Continued)
pull-down resistors are not required. Due to the nature of the
output stage, both its on and off impedance values vary as a
function of the display voltage applied. However, Figures 3, 4
show that this output impedance will remain constant for a
fixed value of display voltage.
Figure 5 demonstrates the critical timing requirements be-
tween CLOCK and DATA IN for the MM58342.
To clear (reset) the display driver at power on or any time,
the following flushing routine may be used. With the enable
signal high, clock in 20 zeroes. Drive the enable signal low
and the display will be blank. It is recommended to clear the
driver at power on.
In Figure 6 the ENABLE signal acts as an envelope, and
only while this signal is at a logic “1” does the circuit accept
CLOCK input signals. Data is transferred and shifted in the
internal shift register on the rising clock edge, i.e., “0”–“1”
transition. When the ENABLE signal goes low, the contents
of the shift registers are latched, and the display will show
new data. During data transfer, the display will show old
data. DATA OUT is also provided on the MM58342 being
output on the falling edge. At any time, the display may be
blanked under processor control, using the BLANKING
CONTROL input.
Figure
7
shows
a
schematic
microprocessor-based system where the MM58342 is used
to provide the grid drive for a 40-digit 2 line 5 x 7 multiplexed
vacuum fluorescent (VF) display. The anode drive in this
example is provided by another member of the high voltage
display driver family, namely the MM58348, which does not
require an extremely generated load signal.
diagram
of
a
Timing Diagrams
00792503
FIGURE 3. Output Impedance Off
00792504
FIGURE 4. Output Impedance On
00792505
FIGURE 5. Clock and Data Timings
M
www.national.com
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相关PDF资料 |
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|---|---|
| MM58348 | MM58348 High Voltage Display Driver |
| MM58348N | DUST CAP |
| MM58348V | MM58348 High Voltage Display Driver |
| MM5837 | Digital Noise Source |
| MM5837N | Digital Noise Source |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MM58348 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:MM58348 High Voltage Display Driver |
| MM58348N | 制造商:NSC 制造商全称:National Semiconductor 功能描述:MM58348 High Voltage Display Driver |
| MM58348V | 制造商:National Semiconductor Corporation 功能描述: 制造商:Texas Instruments 功能描述: |
| MM5837 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Digital Noise Source |
| MM5837N | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Digital Noise Source |
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