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DLX713X Datasheet(PDF) 2 Page - OSRAM GmbH |
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DLX713X Datasheet(HTML) 2 Page - OSRAM GmbH |
2 / 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 2 May 31, 2000-13 Table 1. Electrical inputs Table 2. Pin description Operation In a dot matrix display system, it is advantageous to use a mul- tiplexed approach with 12 drivers (5 digit plus 7 segments) rather than 35 segment drivers, reducing the number of drives and interconnections required. A multiplexed system must be a synchronous system or the digits or elements may have differ- ent on (lit) times and therefore varying brightness. The DLX713X is an internally multiplexed display but the data entry is asynchronous. Loading data is similar to writing into a RAM. Present the data, select the chip, and give a write signal. For a multidigit system, each digit has its own unique location and will display its contents until replaced by another code. The waveforms of Figure 4 demonstrates the relationship of the signals required to generate a write cycle. Check the data sheet for minimum values required for each signal. Pin Name Pin Name 1VCC 14 D6 data input (MSD) 2LT lamp test 13 D5 data input 3CE chip enable 12 D4 data input 4WR write 11 D3 data input 5 BL1 brightness 10 D2 data input 6 BL0 brightness 9 D1 data input 7 GND 8 D0 data input (LSD) VCC Positive Supply +5 V GND Ground D0–D6 Data Lines, see Figure 3 (Character set) CE Chip Enable (active low) Determines which device in an array will accept data WR Write (active low) Data and chip enable must be present and stable before and after the write pulse (see DLX713X data sheet for timing) BL0, BL1 Blanking Control Input (active low) Used to control level of display brightness LT Lamp Test (active low) Causes all dots to light at 1/2 brightness Figure 3. Character set Figure 4. Timing characteristics Display Blanking and Dimming The DLX713x Intelligent Display has the capability of three levels of brightness plus blank. Figure 5 shows the combina- tion of BL0 and BL1 for the different levels of brightness. The BL0 and BL1 inputs are independent of write and chip enable and does not affect the contents of the internal memory. A flashing display can be achieved by pulsing the blanking pins at a 1–2 hertz rate. Either BL0 or BL1 should be held high to light up the display. Table 3. Dimming and blanking control Brightness Level BL1 BL0 Blank 0 0 1/7 brightness 0 1 1/2 brightness 1 0 full brightness 1 1 ASCII CODE D0 D1 D2 D3 0 0 0 0 0 1 0 0 0 1 0 1 0 0 2 1 1 0 0 3 0 0 1 0 4 1 0 1 0 5 0 1 1 0 6 1 1 1 0 7 0 0 0 1 8 1 0 0 1 9 0 1 0 1 A 1 1 0 1 B 0 0 1 1 C 1 0 1 1 D 0 1 1 1 E 1 1 1 1 F 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 2 3 4 5 6 7 D6 D5 D4 HEX 1. High=1 level. 2. Low=0 level. T W T DS T CES CE WR D0-D6 T DH |
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