データシートサーチシステム |
|
DLX713X データシート(PDF) 3 Page - OSRAM GmbH |
|
DLX713X データシート(HTML) 3 Page - OSRAM GmbH |
3 / 4 page 2000 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA Appnote 25 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 3 May 31, 2000-13 Lamp Test The lamp test when activated causes all dots on the display to be illuminated at 1/7 brightness. It does not destroy any previ- ously stored characters. The lamp test function is independent of chip enable, write, and the settings of the blanking inputs. This convenient test gives a visual indication that all dots are functioning properly. Because lamp test does not affect the display memory, it can be used as a cursor or pointer in a line of displays. General Design Considerations When using the DLX713X on a separate display board having more than six inches of cable length, it may be necessary to buffer all of the input lines. A non-inverting 74LS244 buffer can be used. The object is to prevent transient current into the DLX713x protection diodes. The buffers should be located on the display board and as close to the displays as possible. Because of high switching currents caused by the multiplex- ing, local power supply bypass capacitors are also needed in many cases. These should be 10 volt, tantalum type having 10 uf capacitance. The capacitors may only be required every 2 displays depending on the line regulation and other noise generators. Decoupling capacitors should also be used across VCC and ground of each display. Typical value of these capacitors is 0.01 mF/ 10 V. If small wire cables are used it is good engineering practice to calculate the wire resistance of the ground and the +5 volt wires. More than 0.2 volt drop (at 100 ma per digit) should be avoided, since this loss is in addition to any inaccuracies or load regulation of the power supply. The 5 volt power supply for the DLX713X should be the same one supplying the VCC to all logic devices. If a separate supply must be used then local buffers should be used on all the inputs and these buffers should be powered from the display power supply. This precaution is to avoid line transients or any logic signals to be higher than VCC during power up. Interfacing For an eight digit display using the DLX713X, interfacing to a single chip microprocessor is easy and straight forward. Figure 5. Block diagram of the Intel 8031 controller Conclusion Note that although other manufacturers’ products are used in the examples, this application note does not imply specific endorsement, or warranty of other manufacturers’ products by OSRAM. The interface schemes shown demonstrate the sim- plicity of using the DLX713X dot matrix Intelligent Display. Slight timing differences may be encountered for various microproces- sors, but can be resolved similar to those encountered when using different RAM’s. The techniques used in the examples were shown for their generality. The user will undoubtedly invent other schemes to optimize his particular system to its require- ments. 8 8 3 8 8 LATCH BUFFER EPROM 27xx DECODER D Ø D 7 P3.0 P3.1 P3.2 P3.6 PØ ALE 8031 A0-A7 OE PSEN x x x x x |
同様の部品番号 - DLX713X |
|
同様の説明 - DLX713X |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |