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Four Character Smart Alphanumeric Displays Technical Data
HPDL-1414 HPDL-2416
Features
* Smart Alphanumeric Display Built-in RAM, ASCII Decoder and LED Drive Circuitry * Wide Operating Temperature Range -40C to +85C * Fast Access Time 160 ns * Excellent ESD Protection Built-in Input Protection Diodes * CMOS IC for Low Power Consumption * Full TTL Compatibility Over Operating Temperature Range VIL = 0.8 V VIH = 2.0 V * Wave Solderable * Rugged Package Construction * End-Stackable * Wide Viewing Angle
* * * * *
Process Control Equipment Test Equipment Industrial Instrumentation Computer Peripherals Telecommunication Instrumentation
Description
The HPDL-1414 and 2416 are smart, four character, sixteensegment, red GaAsP displays. The HPDL-1414 has a character height of 2.85 mm (0.112"). The HPDL-2416 has a character height of 4.10 mm (0.160"). The on-board CMOS IC contains memory, ASCII decoder, multiplexing circuitry and drivers. The monolithic LED characters are magnified by an immersion lens which increases both character size and luminous intensity. The encapsulated dual-in-line package provides a rugged, environmentally sealed unit.
Typical Applications
* Portable Data Entry Devices * Medical Equipment
The HPDL-1414 and 2416 incorporate many improvements over competitive products. They have a wide operating temperature range, very fast IC access time, and improved ESD protection. The displays are also fully TTL compatible, wave solderable, and highly reliable. These displays are ideally suited for industrial and commercial applications where a goodlooking, easy-to-use alphanumeric display is required.
ESD WARNING: STANDARD CMOS HANDLING PRECAUTIONS SHOULD BE OBSERVED WITH THE HPDL-1414 AND HPDL-2416.
5964-6381E
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Absolute Maximum Ratings
Supply Voltage, VDD to Ground ...................................... -0.5 V to 7.0 V Input Voltage, Any Pin to Ground ........................ -0.5 V to VDD + 0.5 V Free Air Operating Temperature Range, TA[1] ............... -40C to +85C Relative Humidity (non-condensing) at 65C ................................. 90% Storage Temperature, TS .............................................. -40C to +85C Maximum Solder Temperature, 1.59 mm (0.063 in.) below Seating Plane, t < 5 sec. ................................................ 260C ESD Protection @ 1.5 k, 100 pF ...................... VZ = 2 kV (each Pin)
*All typicals at TA = 25C.
Package Dimensions
HPDL-1414
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HPDL-2416
Recommended Operating Conditions
Parameter Supply Voltage Sym. VDD Min. 4.5 Nom. 5.0 Max. 5.5 Units V
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DC Electrical Characteristics over Operating Temperature Range
Parameter Input Current HPDL-1414 HPDL-2416 IDD Blank HPDL-1414 HPDL-2416 IDD 4 Digits ON (10 Segments/digit)[2,3] HPDL-1414 HPDL-2416 IDD 4 Digits ON Cursor[4] HPDL-2416 Input Voltage High Input Voltage Low Power Dissipation[5] HPDL-1414 HPDL-2416 Sym. IIL Min. 25C Typ. 17 17 IDD (BL) 1.2 1.5 IDD 70 85 125 2.0 GND 350 425 450 575 90 115 165 130 170 232 VDD 0.8 715 910 mA mA mA V V mW mW VDD = 5.0 V VDD = 5.0 V VDD = 5.0 V 2.3 3.5 4.0 8.0 mA mA VDD = 5.0 V, BL = 0.8 V 25C Max. 30 30 Max.[1] 50 40 Units A A Test Conditions VDD = 5.0 V, BL = 0.8 V
IDD(CU) VIH VIL PD
Notes: 1. VDD = 5.5 V. 2. "%" illuminated in all four characters. 3. Measured at five seconds. 4. Cursor character is sixteen segments and DP ON. 5. Power Dissipation = (VDD)(IDD) for 10 segments ON.
Optical Characteristics at 25C[6]
Parameter Peak Luminous Intensity per Digit, 8 segments ON (character average) HPDL-1414 HPDL-2416 Peak Wavelength Dominant Wavelength Off Axis Viewing Angle HPDL-1414 HPDL-2416 Sym. IV Peak Min. Typ. Units Test Conditions VDD = 5.0 V, "*" illuminated in all 4 digits
0.4 0.5 Peak d
1.0 1.25 655 640 40 50
mcd mcd nm nm degrees degrees
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AC Timing Characteristics over Operating Temperature Range at VCC = 4.5 V
Parameter Address Setup Time Write Delay Time Write Time Data Setup Time Data Hold Time Address Hold Time Chip Enable Hold Time[1] Chip Enable Setup Time[1] Clear Time[1] Access Time Refresh Rate
Note: 1. HPDL-2416 only.
Symbol tAS tWD tW tDS tDH tAH tCEH tCES tCLR
-20C tMIN 90 10 80 40 40 40 40 90 2.4 130 420-790
25C tMIN 115 15 100 60 45 45 45 115 3.5 160 310-630
70C tMIN 150 20 130 80 50 50 50 150 4.0 200 270-550
Units ns ns ns ns ns ns ns ns ms ns Hz
Timing Diagram
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Character Set
Magnified Character Font Description
HPDL-1414
HPDL-2416
Relative Luminous Intensity vs. Temperature
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Electrical Description
Display Internal Block Diagram HPDL-1414 Figure 1 shows the internal block diagram of the HPDL-1414. It consists of two parts: the display LEDs and the CMOS IC. The CMOS IC consists of a four-word ASCII memory, a 64-word character generator, 17 segment drivers, four digit drivers, and the scanning circuitry necessary to multiplex the four monolithic LED characters. In normal
operation, the divide-by-four counter sequentially accesses each of the four RAM locations and simultaneously enables the appropriate display digit driver. The output of the RAM is decoded by the character generator which, in turn, enables the appropriate display segment drivers. Sevenbit ASCII data is stored in RAM. Since the display uses a 64character decoder, half of the possible 128 input combinations are invalid. For each display location where D5 = D6 in the
ASCII RAM, the display character is blanked. Data Entry HPDL-1414 Figure 2 shows a truth table for the HPDL-1414. Data is loaded into the display through the DATA inputs (D6-D0), ADDRESS inputs (A1-A0), and WRITE (WR). After a character has been written to memory, the IC decodes the ASCII data, drives the display and refreshes it without any external hardware or software.
Figure 1. HPDL-1414 Internal Block Diagram.
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If the clear input (CLR) equals zero for one internal display cycle (4 ms minimum), the data in the ASCII RAM will be rewritten with zeroes and the display will be blanked. Note that the blanking input (BL) must be equal to logical one during this time. Data Entry HPDL-2416 Figure 4 shows a truth table for the HPDL-2416 display. Setting the chip enables (CE1, CE2) to their low state and the cursor select (CU) to its high state will enable data loading. The desired data inputs (D6-D0) and address inputs (A1, A0) as well as the chip enables (CE1, CE2) and cursor select (CU) must be held stable during the write cycle to ensure that the correct data is stored into the display. Valid ASCII data codes are shown in Figure 1. The display accepts standard sevenbit ASCII data. Note that D6 D5 for the codes shown in Figure 4. If D6 = D5 during the write cycle, then a blank will be stored in the display. Data can be loaded into the display in any order. Note that when A1 = A0 = 0, data is stored in the furthest right-hand display location. Cursor Entry HPDL-2416 As shown in Figure 4, setting the chip enables (CE1, CE2) to their low state and the cursor select (CU) to its low state will enable cursor loading. The cursor character is indicated by the display symbol having all 16 segments and the DP ON. The least significant data input (D0), the address inputs (A1, A0), the chip enables (CE1, CE2), and the cursor select (CU) must be held stable during the write cycle to
Figure 2. HPDL-1414 Write Truth Table.
Display Internal Block Diagram HPDL-2416 Figure 3 shows the internal block diagram for the HPDL-2416 display. The CMOS IC consists of a four-word ASCII memory, a four-word cursor memory, a 64-word character generator, 17 segment drivers, four digit drivers, and the scanning circuitry necessary to multiplex the four monolithic LED characters. In normal operation, the divide-byfour counter sequentially accesses each of the four RAM locations and simultaneously enables the appropriate display digit driver. The output of the RAM is decoded by the character generator which, in turn, enables the appropriate display segment drivers. For each display location, the cursor enable (CUE) selects whether the data from the ASCII RAM (CUE = 0) or the stored cursor (CUE = 1) is to be displayed. The cursor character is denoted by all sixteen segments and the DP ON. Seven-bit ASCII data is stored in RAM. Since the display utilizes a 64-character
decoder, half of the possible 128 input combinations are invalid. For each display location where D5 = D6 in the ASCII RAM, the display character is blanked. The entire display is blanked when BL = 0. Data is loaded into the display through the data inputs (D6 - D0), address inputs (A1, A0), chip enables (CE1, CE2), cursor select (CU), and write (WR). The cursor select (CU) determines whether data is stored in the ASCII RAM (CU = 1) or cursor memory (CU = 0). When CE1 = CE2 = WR = 0 and CU = 1, the information on the data inputs is stored in the ASCII RAM at the location specified by the address inputs (A1, A0). When CE1 = CE2 = WR = 0 and CU = 0, information on the data input, D0, is stored in the cursor at the location specified by the address inputs (A1, A0). If D0 = 1, a cursor character is stored in the cursor memory. If D0 = 0, a previously stored cursor character will be removed from the cursor memory.
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Figure 3. HPDL-2416 Internal Block Diagram.
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ensure that the correct data is stored in the display. If D0 is in a low state during the write cycle, then a cursor character will be removed at the indicated location. If D0 is in a high state during the write cycle, then a cursor character will be stored at the indicated location. The presence or absence of a cursor character does not affect the ASCII data stored at that location. Again, when A1 = A0 = 0, the cursor character is stored in the furthest right-hand display location. All stored cursor characters are displayed if the cursor enable
Function Write Data Memory Disable Data Memory Write Write Cursor BL CLR CUE CU L X X X X X X H X X X X X X X X X X H -ORH H H H L CE1 L L X X H L
(CUE) is high. Similarly, the stored ASCII data words are displayed, regardless of the cursor characters, if the cursor enable (CUE) is low. The cursor enable (CUE) has no effect on the storage or removal of the cursor characters within the display. A flashing cursor is displayed by pulsing the cursor enable (CUE). For applications not requiring a cursor, the cursor enable (CUE) can be connected to ground and the cursor select (CU) can be connected to VCC. This inhibits the cursor function and allows only ASCII data to be loaded into the display.
Display Clear HPDL-2416 As shown in Figure 4, the ASCII data stored in the display will be cleared if the clear (CLR) is held low and the blanking input (BL) is held high for 4 ms minimum. The cursor memory is not affected by the clear (CLR) input. Cursor characters can be stored or removed even while the clear (CLR) is low. Note that the display will be cleared regardless of the state of the chip enables (CE1, CE2). However, to ensure that all four display characters are cleared, CLR should be held low for 4 ms following the last write cycle.
CE2 L L X H X L
WR L L H X X L
A1 L L H H X
A0 L H L H X
D6 a b c d X
D5 a b c d X
D4 a b c d X
D3 a b c d X
D2 a b c d X
D1 a b c d X
D0 a b c d X
DIG3 NC NC NC
DIG2 DIG1 DIG0 NC NC NC NC NC NC NC NC NC
Previously Written Data
L L H H L L H H X
L H L H L H L H X
X X X X X X X X X
X X X X X X X X X
X X X X X X X X X
X X X X X X X X X
X X X X X X X X X
X X X X X X X X X
H H H H L L L L X
NC NC NC NC NC NC
NC NC NC NC NC NC
NC NC NC NC NC NC NC NC NC NC NC NC
Clear Cursor
X
X
X
L
L
L
L
Disable Cursor Memory
X X X
X X X
X X X
L L L
X X H
X H X
H X X
Previously Written Cursor
L = LOGIC LOW INPUT H = LOGIC HIGH INPUT X = DON'T CARE
"a" = ASCII CODE CORRESPODING TO SYMBOL " NC = NO CHANGE = CURSOR CHARACTER (ALL SEGMENTS ON)
"
Figure 4a. Cursor/Data Memory Write Truth Table.
Function CUE Clear
BL CLR H H H H H L
CUE L H X
CU X X X
CE1 X X X
CE2 X X X
WR X X X*
DIG3
DIG2
DIG1
DIG0 Display previously written data Display previously written cursor Clear data memory, cursor memory unchanged
*NOTE: CLR should be held low for 4 ms following the last WRITE cycle to ensure all data is cleared. Blanking L X X X X X X Blank display, data and cursor" memories unchanged.
Figure 4b. Displayed Data Truth Table.
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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 information please consult Application Note 1026.
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 enhancement filter. For further information on contrast enhancement, see Hewlett-Packard Application Note 1015.
The HPDL-1414/2416 are assembled 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.
Mechanical and Electrical Considerations
The HPDL-1414/2416 are dual inline packages that can be stacked horizontally and vertically to create arrays of any size. These displays are designed to operate continuously between -40C to +85C with a maximum of 10 segments on per digit. During continuous operation of all four Cursors the operating temperature should be limited to -40C to +55C. At temperatures above +55C, the maximum number of Cursors illuminated continuously should be reduced as follows: No Cursors illuminated at operating temperatures above 75C. One Cursor can be illuminated continuously at operating temperatures below 75C. Two Cursors can be illuminated continuously at operating temperatures below 68C. Three Cursors can be illuminated continuously at operating temperatures below 60C.
Optical Considerations/ Contrast Enhancement
The HPDL-1414 and HPDL-2416 displays use a precision aspheric immersion lens to provide excellent readability and low offaxis distortion. For the HPDL1414, 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-
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Soldering and Post Solder Cleaning Instructions
The HPDL-1414/2416 may be hand soldered or wave soldered with SN63 solder. Hand soldering may be safely performed only with an electronically temperature-controlled and securely grounded soldering iron. For best results, the iron tip temperature should be set at
315C (600F). For wave soldering, a rosin-based RMA flux can be used. The solder wave temperature should be 245C 5C (473F 9F), and the dwell in the wave should be set at 11/2 to 3 seconds for optimum soldering. Preheat temperature should not exceed 93C (200F) as measured on the solder side of the PC board.
For further information on soldering and post solder cleaning, see Application Note 1027, Soldering LED Components.
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