APPLICATION NOTE VACUUM FLUORESCENT DISPLAY MODULE

Transcription

1 APPLICATION NOTE VACUUM FLUORESCENT DISPLAY MODULE AN-E-2224 CHARACTER DISPLAY MODULE M22MD7HB INSTRUCTION MANUAL GENERAL DESCRIPTION Futaba Vacuum Fluorescent Display Module M22MD7HB, with Futaba VFD 22- MD-7GR display, produces 2 digits on 2 rows. Each character is displayed in 5 7 dot matrix. Consisting of a VFD, one chip controller, driver IC, the module can be connected directly to the system bus, thus simplifying interfacing. The bright and aesthetically pleasing VFD makes the module desirable for application in office equipment s, computer terminals, measuring equipment, etc.

2 ! Important Safety Notice Please read this note carefully before using the product. Warning The module should be disconnected from the power supply before handling. The power supply should be switched off before connecting or disconnecting the power or interface cables. The module contains electronic components that generate high voltages which may cause an electrical shock when touched. Do not touch the electronic components of the module with any metal objects. The VFD used on the module is made of glass and should be handled with care. When handling the VFD, it is recommended that cotton gloves be used. The module is equipped with a circuit protection fuse. Under no circumstances should the module be modified or repaired. Any unauthorized modifications or repairs will invalidate the product warranty. The module should be abolished as the factory waste. AN-E-2224 [Important Safety Notice]

3 . FEATURES -. One chip controller is equipped on the module and it realizes intelligent terminal. The module can be connected to the bus directly. -2. Two hundred and twenty-for character fonts consisting of alphabets, numeral and other symbols can be displayed. -3. By using dimming function, luminance can be controlled into six levels. -4. Since a DC/DC converter is included, only 5Vdc power source is required to operate the module. -5. High quality and reliability, also long life can be achieved with FUTABA VFD. -6. Compact, light weight and thin design by using SMART (Surface Mount And Reflow Technology) provides excellent built-in capability. -7. Either parallel or serial input interface can be selected. In case of serial input, it is possible to choose 2, 24, 24, 782.5, 96, 5625, 325 and 625 bps. AN-E-2224 [/5]

4 2. GENERAL SPECIFICATIONS 2-. DIMENSIONS, WEIGHT (Refer FIGURE-) Table- Item Specification Unit Outer Dimension (L) 9±.5 (W) 64±.5 (T) 25 Max. mm Weight 2 g 2-2. SPECIFICATIONS OF THE DISPLAY PANEL (Refer FIGURE-4) Table-2 Item Specification Unit Display Area mm Number of Digits 2 digits (5 7) 2 rows Digits Size (H M) mm Digits Pitch (H M) mm Color of Illumination Green (λp=55nm) 2-3. ENVIRONMENT CONDITIONS Table-3 Item Symbol Min. Max. Unit Operating Temperature Topr C Storage Temperature Tstg C Operating Humidity Hopr 2 85 % Storage Humidity Hostg 2 9 % Vibration ( to 55 Hz) 4 G Shock 4 G Note) Avoid operations and or storage in moist environmental conditions ABSOLUTE MAXIMUM RATINGS Table-4 Item Symbol Min. Max. Unit Supply Voltage Vcc Vdc Input Signal Voltage V IS -.3 Vcc+.3 V AN-E-2224 [2/5]

5 2-5. RECOMMENDED OPERATING CONDITIONS Table-5 Item Symbol Condition Min. Typ. Max. Unit Supply Voltage Vcc Vdc H-Level Input Voltage V IH Vcc=5Vdc V L-Level Input Voltage V IL Vcc=5Vdc.5 V 2-6. ELECTRICAL CHARACTERISTICS Table-6 Item Symbol Condition Min. Typ. Max. Unit Supply Current Icc..5 A Power Consumption Vcc=5Vdc 5. W Luminance L All Dos on 35 7 cd/m 2 (2) (24) (fl) H-Level Input Current I IH Vcc=5.5Vdc V IH =5.5V L-Level Input Current I IL Vcc=5.5Vdc V IL =V H-Level Output Voltage V OH Vcc=4.5Vdc I OH =-.5mA L-Level Output Voltage V OL Vcc=5.5Vdc I OL =.5mA µa ma 3.6 V.9 V AN-E-2224 [3/5]

6 M22MD7HB OUTER DIMENSIONS FIGURE- AN-E-2224 [/5]

7 M22MD7HB CIRCUIT BLOCK DIAGRAM FIGURE-2 X XT XT D D7 SEG SEG36 SD WR SEL TEST BUSY GCLK GD BLKO RST Hvcc D CONTROLLER DC/DC CONVERTER 22-MD-7G 2digits 2rows 5 7dots+Triangle mark GRID -4 GRID DRIVER (4bits) GRID DRIVER FILAMENT (VFD) D7 RXD WR SEL TEST BUSY RESET Vcc(+5V) GND AN-E-2224 [2/5]

8 M22MD7HB DISPLAY CHARACTER CODE FIGURE-3 D3 D2 D D D7 D6 D5 D A B C D E F DP SP DIM DC 8 BS TON 9 HT TOF A TFF B C D CLR E F ALD RST SP SP : SPACE AN-E-2224 [3/5]

9 M22MD7HB DISPLAY PATTERN DETAIL FIGURE AN-E-2224 [4/5]