Specification of Vacuum Fluorescent Display NORITAKE ITRON CORPORATION Sheet 1/19 DS25402 Item No. Rev. Spec. No. Date(M-D-Y) 0 P-R Aug-16-07 DS2045G 1 P-R1 Dec-10-07 2 P-R2 Dec-19-07 3 T-R Dec-26-07 4 T-R1 Jan-07-08 5 T-R2 May-15-08 Index 1. Absolute Maximum Ratings 2. Recommended Operating Conditions 3. Electrical and Optical Characteristics 4. Example of Drive Circuit 5. PIN Description 6. Pin Assignment 7. Functional Descriptions 7.1. Instruction table 7.2. Display Clear 7.3. Cursor Home 7.4. Entry Mode Set 7.5. Display ON/OFF 7.6. Cursor / Display shift 7.7. Function Set 7.7.1. Brightness Control 7.8. Set CG RAM Address 7.9. Set DD RAM Address 7.10. Write Data 7.11. Read Data 7.12. Read Busy Flag/Address Counter 8. Other Features 8.1. CG RAM 8.2. Power-on reset 9. Character Font 9.1. Japanese Character 9.2. European Character 10. Serial Data Transfer 11. Interface Timing 12. Pattern Assignment 13. Outer Dimension 2 2 3 4 5 5 6 6 7 7 7 8 8 9 9 10 10 10 11 11 12 12 13 14 14 15 16 17 18 19
DS2045G Sheet 3/19 3. Electrical and Optical Characteristics At typical operating condition, all segments turned on, Ef=4Vdc, VDD1=5Vdc, VDD2=36, Ek=1.5Vdc, Vss=0V unless otherwise noted. Ratings Parameter Symbol Test Condition Unit MIN TYP MAX Filament Current If VDD1=VDD2=0V 150.0 167.0 184.0 madc Logic Supply Current 1) IDD1 VDD1=5Vdc - 3.0 6.0 ma Display Supply Current 1) IDD2 Average - 10.0 20.0 ma High Level Input Current IIH VIN=VDD1 20-500 μa Low Level Input Current IIL VIN=GND 20-500 μa Logic H-Level Output Voltage VOH IOH=4mA VDD1-0.6 - - V Logic L-Level Output Voltage VOL IOL=4mA - - 0.4 V Operation Frequency fosc R=200KΩ C=0.01μF 1000 1250 1500 KHz HOSC1 Output Frequency fhosc1 - - 1/8 fosc - KHz HOSC2 Output Frequency fhosc2 - - 1/12 fosc - KHz Luminance 2) L [G] Ta=20 350 (700) - cd/m 2 Color of illumination Green [G] Notes: 1) After ES is verified, the value might be reviewed. Please acknowledge it beforehand. 2) ( ) : The numerical value in parentheses is a reference value. 3) Slow rise up power supply may cause a failure of Power-on reset which is explained in "8.2 Power-on reset". Caution Avoiding unexpected working because of rising environmental temperature, consider to dissipate the heat. Precautions should be taken to minimize the possibility of static charges occurring during handling and assembly of the VFDs. Avoiding burn-in problem because of fixed pattern, scroll, screen saver or sleep functions are recommended. Announcement This specification is subject to change without prior notice.
No. 1 2 3 425 26 27 28 29 30 31 32 F1 F1 F1 NP HOSC2 HOSC1 T1 NC OSCI RST SI/SO No. 33 34 35 36 37 38 39 40 41 42 43 STB SCK VDD1 Vss Vss VDD2 NP NP F2 F2 F2
DS2045G Sheet 13/19 8.2. Power-on reset Internal status of the VFD is initialized, when the controller detects the rising of power supply up. The status are as follows: 1. Display clear Fills the DD RAM with 20Hex (Space code). During executing of Display Clear (Max 100 μs), the busy flag (BF) is 1. 2. Sets the address counter to 0H. Sets the address counter to point the DD RAM. 3. Display ON/OFF D = 0 : display OFF B = 0 : Blink OFF 4. Entry Mode Set I/D = 1 : Increment (+1) S = 0 : No display shift 5. Brightness Control BR0 to BR3 =0 : 100% Parameter Reset Time VDD1 Rising Time VDD1 OFF Width Detecter Voltage Symbol Min. Typ. Max. Unit tres - - 10 μs trdd 1-100 ms toff 40 - - ms Vdet - - 2.7 V VDD1 trdd Vdet tres toff Busy Flag Remarks There is a possibility that reset doesn't work by slow start power supply. Therefore the initializing by commands needs.
The display might be flickered if character-codes are written very fast(nearby minimum value of the shift clock).
DS2045G Sheet 17/19 11. Interface Timing Parameter Symbol Condition Min. Typ. Max. Unit Shift Clock Cycle High Level Shift Clock Pluse Width Low Level Shift Clock Pulse Width Shift Clock Hold Time Data Setup Time Data Hold Time STB Hold Time STB Pulse Width Wait Time Output Data Delay Time Output Data Hold Time Reset Pulse Width tcyk twhk twlk thstbk tds tdh tdkstb twstb twait todd todh twre SCK SCK SCK STB SCK Data SCK SCK Data SCK STB 8th CLK 1st CLK SCK Data SCK Data - 500 - - ns 200 - - ns 200 - - ns 100 - - ns 100 - - ns 100 - - ns 500 - - ns 500 - - ns 1 - - ns - - 150 ns 5 - - ns 500 - - ns INPUT twstb STB thstbk twhk tcyk twlk tdkstb SCK tds tdh SI OUTPUT twstb STB thstbk tcyk twhk twlk tdkstb SCK todd todh SO