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DLX2416 データシート(PDF) 4 Page - OSRAM GmbH |
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DLX2416 データシート(HTML) 4 Page - OSRAM GmbH |
4 / 5 page 2000 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA Appnote 14 www.infineon.com/opto • 1-888-Infineon (1-888-463-4636) OSRAM Opto Semiconductors GmbH & Co. OHG • Regensburg, Germany www.osram-os.com • +49-941-202-7178 4 May 31, 2000-12 When using the DLX2416 on a separate display board having more than 6 inches of cable length, it may be necessary to buffer all inputs. This is most easily achieved with Hex non- inverting buffers such as the 74365. The object is to prevent transient current in the protection diodes. The buffers should be located on the display board near the displays. Local power supply bypass capacitors are also needed in many cases. These should be 6 or 10 volt, tantalum type having 10 µF or greater capacitance. Low internal resistance is important due to current steps which result from the internal multiplexing of the displays. If small wire cables are used, it is good engineering practice to calculate the wire resistance of the ground plus the +5 volt wires. More than 0.1 volt drop, (at 25 mA per digit worst case) should be avoided, since this loss is in addition to any inaccura- cies or load regulation limitations of the power supply. Figure 6. General interface circuit Figure 7. 16-digit parallel I/O system Display Decoder Display Display Display Vcc GND D0–D6 A2 A3 CE 7/ CU CUE BL CLR WR A0 A1 D15 D12 D11 D8 D7 D4 D3 D0 0-6 7 Display Port A D0 Display Display Display D3 D4 D7 D8 D11 D12 D15 Port B Port C 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 Control Data 8080 µP System 8255 Vcc GND D0–D6 CU CLR CUE BL A0 A1 A2 A3 3 2 1 0 WR A B C D 7442 5 / The 5-volt power supply for the displays should be the same one supplying VCC to all logic devices which drive the dis- play devices. If a separate supply must be used, then local buff- ers using hex non-inverting gates should be used on all displays inputs and these buffers should be powered from the display power supply. This precaution is to avoid logic inputs higher than display VCC during power up or line transients. Program for 16-Character Message INT: MVI A,80H OUT CONTROL ;CONTROL DATA MODE ;LOAD CONTROL REGISTER CUSR: MVI A,00H OUT PORT A MVI B, 0FH ;CLEAR CURSOR DATA ;LOAD DATA PORT ;SET CHARACTER COUNTER CUSRI: MOV A, B CALL DSPWT DCR B JNZ CUSRI MOV A, B CALL DSPWT MVI A, FFH OUT PORT B ; ;WRITE SUBROUTINE ;DECREMENT COUNTER ;DIGIT 0? ; ; ;SET DATA FOR CONTROL ;LOAD CONTROL LINES DISP: LXI H, TABLE ;SET TABLE ADDRESS DISP1: MOV A, M OUT PORT A MOV A, B CALL DSPWT INX H INR B MVI A, 10H CMP B JNZ DISP1 HALT ;MOVE TABLE DATA INTO ACCUMULATOR ;LOAD DATA PORT ; ;LOAD ADDRESS AND CONTROL ;INCREMENT TABLE ADDRESS ;INCREMENT COUNTER ;SET # OF DIGITS ; ;16 CHARACTERS? ;END OF PROGRAM DSPWT: ORI F0H OUT PORT C ANI 7FH OUT PORT C ORI F0H OUT PORT C RET ;SET CONTROL BITS OFF ;LOAD CONTROL ;SET WRITE BIT ON ;LOAD WRITE ;SET WRITE BIT OFF ;LOAD CONTROL TABLE: DB ;0C3H ;0C9H ;0D4H ;0D3H ;0C1H ;0D4H ;0CEH ;0C1H ;0C6H ;0A0H ;0D3H ;0D4H ;0C8H ;0C7H ;0C9H ;0CCH |
同様の部品番号 - DLX2416 |
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同様の説明 - DLX2416 |
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