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HPDL1414 Datasheet(PDF) 11 Page - Agilent(Hewlett-Packard) |
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HPDL1414 Datasheet(HTML) 11 Page - Agilent(Hewlett-Packard) |
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11 / 12 page  3-185 Display Blank HPDL-2416 As shown in Figure 4, the display will be blanked if the blanking input (BL) is held low. Note that the display will be blanked regardless of the state of the chip enables (CE1, CE2) or write (WR) inputs. The ASCII data stored in the display and the cursor memory are not affected by the blanking input. ASCII data and cursor data can be stored even while the blanking input (BL) is low. Note that while the blanking input (BL) is low, the clear (CLR) function is inhibited. A flashing display can be obtained by applying a low frequency square wave to the blanking input (BL). Because the blanking input (BL) also resets the internal display multiplex counter, the frequency applied to the blanking input (BL) should be much slower than the display multiplex rate. Finally, dimming of the display through the blanking input (BL) is not recommended. For further application informa- tion please consult Application Note 1026. Optical Considerations/ Contrast Enhancement The HPDL-1414 and HPDL-2416 displays use a precision aspheric immersion lens to provide excellent readability and low off- axis distortion. For the HPDL- 1414, the aspheric lens produces a magnified character height of 2.85 mm (0.112 in.) and a viewing angle of ± 40°. For the HPDL-2416, the aspheric lens produces a magnified character height of 4.1 mm (0.160 in.) and a viewing angle of ± 50°. These features provide excellent readability at distances up to 1.5 metres (4 feet) for the HPDL- 1414 and 2 metres (6 feet) for the HPDL-2416. Each HPDL-1414/2416 display is tested for luminous intensity and marked with an intensity category on the side of the display package. To ensure intensity matching for multiple package applications, mixing intensity categories for a given panel is not recommended. The HPDL-1414/2416 display is designed to provide maximum contrast when placed behind an appropriate contrast enhance- ment filter. For further informa- tion on contrast enhancement, see Hewlett-Packard Application Note 1015. Mechanical and Electrical Considerations The HPDL-1414/2416 are dual in- line packages that can be stacked horizontally and vertically to create arrays of any size. These displays are designed to operate continuously between -40 °C to +85 °C with a maximum of 10 segments on per digit. During continuous operation of all four Cursors the operating temperature should be limited to -40 °C to +55°C. At temperatures above +55 °C, the maximum number of Cursors illuminated continuously should be reduced as follows: No Cursors illumin- ated at operating temperatures above 75 °C. One Cursor can be illuminated continuously at operating temperatures below 75 °C. Two Cursors can be illuminated continuously at operating temperatures below 68 °C. Three Cursors can be illuminated continuously at operating temperatures below 60 °C. The HPDL-1414/2416 are assem- bled by die attaching and wire bonding the four GaAsP/GaAs monolithic LED chips and the CMOS IC to a high temperature printed circuit board. An immersion lens is formed by placing the PC board assembly into a nylon lens filled with epoxy. A plastic cap creates an air gap to protect the CMOS IC. Backfill epoxy environmentally seals the display package. This package construction provides the display with a high tolerance to temperature cycling. The inputs to the CMOS IC are protected against static discharge and input current latchup. However, for best results standard CMOS handling precautions should be used. Prior to use, the HPDL-1414/2416 should be stored in anti-static tubes or conductive material. During assembly a grounded conductive work area should be used, and assembly personnel should wear conductive wrist straps. Lab coats made of synthetic material should be avoided since they are prone to static charge build-up. Input current latchup is caused when the CMOS inputs are subjected either to a voltage below ground (VIN < ground) or to a voltage higher than VDD (VIN > VDD) and when a high current is forced into the input. To prevent input current latchup and ESD damage, unused inputs should be connected either to ground or to VDD. Voltages should not be applied to the inputs until VDD has been applied to the display. Transient input voltages should be eliminated. |
Similar Part No. - HPDL1414 |
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Similar Description - HPDL1414 |
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