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參數(shù)資料
| 型號： | MM58348V |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | MM58348 High Voltage Display Driver |
| 中文描述： | VACUUM FLUOR DISPLAY DRIVER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 142K |
| 代理商： | MM58348V |
Connection Diagrams
Dual-In-Line Package
TL/F/5601–2
Top View
FIGURE 2
Order Number MM58348N
See NS Package Number N40A
Plastic Chip Carrier
TL/F/5601–8
Top View
Order Number MM58348V
See NS Package Number V44A
Functional Description
This product is specifically designed to drive multiplexed or
non-multiplexed high voltage alphanumeric or dot matrix
vacuum fluorescent (VF) displays. Character generation is
done externally in the microprocessor, with a serial data
path to the display driver. The MM58348 uses two signals,
DATA IN and CLOCK, with a format of a leading ‘‘1’’ fol-
lowed by the 35 data bits, hence allowing data transfer with-
out an additional signal. A block diagram of the MM58348 is
shown in Figure 1.
Figure 2 shows the pinout of the MM58348 device, where
output 1 (pin 18) is equivalent to bit 1, (i.e., the first bit of
data to be loaded into the shift register following the start
bit). A logic ‘‘1’’ at the input will turn on the corresponding
display digit/segment/dot output.
A significant reduction in discrete board components can be
achieved by use of the MM58348, because external 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, Figure 3a
and 3b show that this output impedance will remain con-
stant for a fixed value of display voltage.
TL/F/5601–3
FIGURE 3a. Output Impedance Off
TL/F/5601–4
FIGURE 3b. Output Impedance On
3
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