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PDF AN133 Data sheet ( Hoja de datos )
| Número de pieza | AN133 | |
| Descripción | MC3401 Interface / VFD Driver Control Using MC80F0308 | |
| Fabricantes | ABOV | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AN133 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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AN133
MC3401 Interface
VFD Driver Control Using MC80F0308
1. Overview
VFD(Vacuum Fluorescent Display) is a display representing data based on the following routes; thermal
electrons are created through the voltage supplied in the filaments and accelerated electrons from Grids
could reach Anodes to collide with phosphors already patterned to illuminate for displaying.
Illuminates when (+)voltage is supplied to the Anode (+), does not illuminate when(-) voltage is supplied.
VFD(Vacuum Fluorescent Display) was first developed in 1967 and began to be applied to electronic
calculators, and became colorized by the help of the co-development of a Phosphor maker in 1980s.
VFD is an element which emits light by itself; through electrons constantly released from the Filament -
functioning as an electron gun of CRT- controlled by the Grids and Anodes to collide onto the phosphors
of Anodes to illuminate.
VFD surely represents Multi-color, excellent visual recognition by means of a clear display with high
brightness (self-luminous device), less eye fatigue compared to LED (soft light), wide viewing angle,
operating at low voltage with low power consumption, easy application of parts, and it has such a high
reliability that VFDs apply to various areas
Figure 7. General VFD Structure
VFD Operation Order
1. To supply voltage to the Filament, electrons emitted
2. Electrons heading to the Anode are accelerated at the Grid.
3. Emitted electrons are attracted to phosphors of the Anode of the lower substrate supplied
with (+)voltage.
4. Accelerated electrons collide onto the phosphor layer Anode illuminate.
Field Application Team
1/30 8-bit Microcontroller Application Note
Free Datasheet http://www.Datasheet4U.com
1 page  
AN133
RECOMMENDED SOFTWARE PROGRAMMING FLOW CHART
Field Application Team
5/30 8-bit Microcontroller Application Note
Free Datasheet http://www.Datasheet4U.com
5 Page 
AN133
SCANNING AND DISPLAY TIMING
The Key Scanning and display timing diagram is given below. One cycle of key scanning consists of 2
frames. The data of the 16 x 2 matrix is stored in the RAM.
Internal Operating Frequency (fosc) = 224/T
Note : T is the width of segment only
SERIAL COMMUMICATION FORMAT
The following diagram shows the MC3401 serial communication format. The DOUT Pin is an N-channel,
open-drain output pin, therefore, it is highly recommended that an external pull-up resistor (1KΩ
to10KΩ) must be connected to DOUT.
RECEPTION (Data/Command Write)
Field Application Team
11/30
8-bit Microcontroller Application Note
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AN133.PDF ] | |
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