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PD2435/PD3535/PD4435 RED PD2436/PD3536/PD4436 BRIGHT GREEN PD2437/PD3537/PD4437
HER 0.200" Character, PD2435/6/7 0.270" Character, PD3535/6/7 0.45" Character, PD4435/6/7 4-Character 5x7 Dot Matrix Alphanumeric Programmable DisplayTM with Built-in CMOS Control Functions
PD243X
PD353X
PD443X
FEATURES * Four Dot Matrix Characters in High Efficiency Red, Red, and Bright Green - PD2435/6/7, 0.200" High - PD3535/6/7, 0.270" High - PD4435/6/7, 0.45" High * Built-in Memory, Decoders, Multiplexer and Drivers * Wide Viewing Angle, X Axis 55, Y Axis 65 * Categorized for Luminous Intensity * 128 Character ASCII Format (Upper and Lower Case Characters) * 8 Bit Bidirectional Data BUS * READ/WRITE Capability * Dual In-Line Package Configuration, 0.600" Wide, 0.100" Pin Centers * End-Stackable Package * Internal or External Clock
* * * * *
Built-in Character Generator ROM TTL Compatible Easily Cascaded for Multidisplay Operation Less CPU Time Required Software Controlled Features: - Programmable Highlight Attribute (Blinking, Non-Blinking) - Asynchronous Memory Clear Function - Lamp Test - Display Blank Function - Single or Multiple Character Blinking Function - Programmable Intensity Three Brightness Levels * Extended Operating Temperature Range: - PD243X, PD353X: -40C to +85C - PD443X: -40C to +70C
1
DESCRIPTION These Programmable Displays are four digit display system modules. The characters are 0.20" by 0.14" (PD243X), 0.27" by 0.20" (PD353X), and 0.45" by 0.27" (PD443X) 5x7 dot matrix arrays constructed with the latest solid state technology in light emitting diodes. Driving and controlling the LED arrays is a silicon gate CMOS integrated circuit. This integrated circuit provides all necessary LED drivers and complete multiplexing control logic. Additionally, the IC has the necessary ROM to decode 128 ASCII alphanumeric characters and enough RAM to store the display's complete four digit ASCII message with special attributes. These attributes, all software programmable at the user's discretion, include a lamp test, brightness control, displaying cursors, alternating cursors and characters, and flashing cursors or characters. The CMOS IC also incorporates special interface control circuitry to allow the user to control the module as a fully supported microprocessor peripheral. The module, under internal or external clock control, has asynchronous read, write, and memory clear over an eight bit parallel, TTL compatible, bi-directional data bus. Each module is fully encapsulated within a package 1.0" x 0.7" x 0.2" (PD253X), 1.4" x 0.72" x 0.285" (PD353X), and 1.5" x 0.82" x 0.285" (PD443X). The standard 20 pin DIP construction with two rows spaced at 0.6" on 0.1" centers is wave solderable.
Dimensions in Inches (mm)
1.000 max. (25.40) .140 (3.56) .125 (3.18) .250 (6.35)
.200 (5.08) at seating plane and centered on package
.700 (17.78)
.200 (5.08)
.600 (15.24)
Pin 1 location
Pin 1 Indicator
PD243X SIEMENS YYWW Z
EIA date code Luminous Intensity Code
.160 .020 (4.06 .51)
.050 (1.27) .100 typ. (2.54)
.070 .004 typ. (1.78 .10) .018 x .012 typ. (.46 x .31)
Tolerance: .XXX=0.02 (.51)
1.400 max. (35.56) .350 (8.89) typ. .200 (5.08) typ. .285 (7.24)
.175 (4.45)
at seating plane and centered on package
.720 max. (18.29)
See the end of this data sheet or refer to Appnotes 18, 19, 22, and 23 for further details on handling and assembling Siemens Programmable Displays.
.270 typ. .450 (6.86) (11.43)
.600 typ. (15.24)
Pin 1 Identifier and ESD warning Part No. EIA date code Luminous Intensity PD3537 Code
SIEMENS YYWW Z
.160 .020 (4.06 .51)
.250 (6.35)
.018 x .012 typ. (.46 x .31) .100 (2.54) typ. Tolerance:
.XXX=0.010 (.25) unless max.
1.500 max. (38.1) .285 (7.24)
.050 (1.27)
.270 (6.86) typ.
.375 (9.53) typ.
at seating plane and centered on package
.820 max. (20.83)
.45 .010 .600 (11.43) (15.24)
.600 typ. (15.24)
Pin 1 Indicator Part No.
EIA date code Luminous Intensity Code
Z
.160 .020 (4.06 .51)
PD4437 SIEMENS YYWW
.300 (7.62)
.018 x .012 .002 typ. (.46 x .31 .05) .100 (2.54) typ.
Tolerance: .XXX=0.020 (.51)
PD2435/6/7, PD3535/6/7, PD4435/6/7
2
Maximum Ratings DC Supply Voltage......................................... -0.5 V to +7.0 Vdc Input Voltage Relative to GND (all inputs)............................... -0.5 V to VCC +0.5 Vdc Operating Temperature PD243X/353X................................................. -40C to +85C PD443X .......................................................... -40C to +70C Storage Temperature....................................... -40C to +100C Maximum Solder Temperature, .063" (1.59 mm) below Seating Plane, t<5 sec. ...................................... 260C Optical Characteristics at 25C Spectral Peak Wavelength HER ..................................................................... 635 nm typ. Red ...................................................................... 660 nm typ. Green................................................................... 565 nm typ. Viewing Angle Horizontal PD243X/353X .................................................................. 55 PD443X............................................................................ 40 Vertical (off normal axis) .................................................. 65 Digit Height PD243X........................................................ 0.200" (5.08 mm) PD353X........................................................ 0.270" (6.86 mm) PD443X........................................................ 0.45" (11.43 mm) Time Averaged Luminous Intensity (1) Red ............................................................... 30 cd/LED min. HER/Green.................................................... 90 cd/LED min. LED to LED Intensity Matching...............................1.8:1.0 max. Device to Device (one bin) ......................................1.5:1.0 max. Bin to Bin (adjacent bins).........................................1.9:1.0 max.
Note: 1) Peak luminous intensity values can be calculated by multiplying these values by 7.
Figure 2. Timing characteristics--data "write" cycle
CE0, CE1 TCES TCEH 2.0 V 0.8 V *
A0, A1 TAS D0-D6 TDS TDH TAH
2.0 V 0.8 V *
2.0 V 0.8 V *
RD TRS WR TRH
2.0 V 0.8 V * 2.0 V 0.8 V *
TW TACC
Notes: 1. All input voltages are VIL=0.8 V, VIH=2.0 V. 2. These waveforms are not edge triggered.
Figure 3. Timing characteristics--data "read" cycle
CE0, CE1 2.0 V 0.8 V *
TCES
TCEH
A0-A3
2.0 V 0.8 V *
TAS
D0-D6
TAH DATA OUT TDD TDH TRI TWH
2.0 V 0.8 V * 2.0 V 0.8 V * 2.0 V 0.8 V *
WR RD
TWS
Figure 1. Top view 20
TR TRACC
11
20
11
20
11
DIGIT3
DIGIT2
DIGIT1
DIGIT0
DIGIT3
DIGIT2
DIGIT1 DIGIT0
DIGIT3
DIGIT2
DIGIT1
DIGIT0
1
10
1
10
1
10
PD2435/6/7, PD3535/6/7, PD4435/6/7
3
Switching specifications (VCC=4.5 V) Write Cycle Timing Parameter Description Specification Minimum -40C TCLR(1) TCLRD(1) TAS TCES TRS TDS TW TAH TDH TCEH TRH TACC Clear RAM Clear RAM Disable Address Setup Chip Enable Setup Read Enable Setup Data Setup Write Pulse Address Hold Data Hold Chip Enable Hold Read Enable Hold Total Access Time = Setup Time + Write Time + Hold Time 1 1 10 0 10 20 60 20 20 0 20 90 25C 1 1 10 0 10 30 70 30 30 0 30 110 85C 1 1 10 0 10 50 90 40 40 0 40 140 Units s s ns ns ns ns ns ns ns ns ns ns
Switching specifications (VCC=4.5 V) Read Cycle Timing Parameter Description Specification Minimum -40C TAS TCES TWS TDD TR TAH TDH TTRI TCEH TWH TACC TWAIT (1) Address Setup Chip Enable Write Enable Setup Data Delay Time Read Pulse Address Hold Data Hold Time to Tristate (Max. time) Chip Enable Hold Write Enable Hold Total Access Time = Setup Time + Read Time + Time to Tristate Wait Time between Reads 0 0 20 100 150 0 0 30 0 30 200 0 25C 0 0 30 150 175 0 0 40 0 40 245 0 85C 0 0 40 175 200 0 0 50 0 50 290 0 Units ns ns ns ns ns ns ns ns ns ns ns ns
Notes: 1) Wait 1 s between any Reads or Writes after writing a Control Word with a Clear (D7=1). Wait 1 s between any Reads or Writes after Clearing a Control Word with a Clear (D7=0). All other Reads and Writes can be back to back. 2) All input voltages are (V =0.8 V, V =2.0 V) IL IH 3) Data out voltages are measured with 100 pF on the data bus and the ability to source = -40 A and sink=1.6 mA The rise and fall times are 60 ns. VOL=0.4 V, VOH=2.4 V.
PD2435/6/7, PD3535/6/7, PD4435/6/7
4
DC characteristics at 25C Parameter Limits Min. VCC Blank (All Inputs Low) lCC 80 LEDs/unit (100% Bright) PD243X PD353X PD443X VIL VIH IIL (except D0 to D7) (1) 2.0 25 100 0.4 2.4 -8.9 1.6 100 240 4.5 Typ. 5.0 2.5 115 145 150 Max. 5.5 3.5 130 165 170 0.8 Units Volts mA mA mA mA Volts Volts A Volts Volts mA mA pF pF Nominal VCC=5 V, All inputs=0.8 V VCC=5 V VCC=5 V VCC=5 V VCC=4.5 V to 5.5 V VCC=4.5 V to 5.5 V VCC=4.5 V to 5.5 V, VIN =0.8 V VCC=4.5 V to 5.5 V VCC=4.5 V to 5.5 V VCC=4.5 V, VOH=2.4 V VCC=4.5 V, VOL=0.4 V Conditions
VOL VOH IOH IOL Data I/O Bus Loading Clock I/O Bus Loading
Note: 1) D0 to D7 have no pull-up resistors so current is negligible.
Pin assignments and definitions Pin 1 2 Function RD CLK I/O Definition Active low, will enable a processor to read all registers in the display. If CLK SEL (pin 3) is low, then expect an external clock source into this pin. If CLK SEL is high, then this pin will be the master or source into this pin. If CLK SEL is high, then this pin will be the master or source for all other devices which have CLK SEL low. CLOCK SELECT determines the action of pin 2. CLK I/O, see the section on Cascading for an example. Reset. Must be held low until VCC >4.5 V. Reset is used only to synchronize blinking and will not clear the display. Chip enable (active high). Chip enable (active low). Address input (MSB). Address input. Address input (LSB). Ground.
Pin assignments and definitions (continued) Pin 11 Function WR Definition Write. Active low. If the device is selected, a low on the write input loads the data into memory. Data Bus bit 7 (MSB). Data Bus bit 6. Data Bus bit 5. Data Bus bit 4. Data Bus bit 3. Data Bus bit 2. Data Bus bit 1. Data Bus bit 0 (LSB). Positive power pin.
12 13 14 15 16 17 18 19 20
D7 D6 D5 D4 D3 D2 D1 D0 VCC
3
CLK SEL
4
RST
5 6 7 8 9 10
CE1 CE0 A2 A1 A0 GND
PD2435/6/7, PD3535/6/7, PD4435/6/7
5
Functional Description The block diagram includes 5 major blocks and internal registers (indicated by dotted lines). Display Memory consists of a 5x8 bit RAM block. Each of the four 8-bit words holds 7-bits of ASCII data (bits D0-D6) and an attribute select bit (Bit D6). The fifth 8-bit memory word is used as a control word register. A detailed description of the control register and its functions can be found in the Control Word section. Each 8-bit word is addressable and can be read from or written to. The Control Logic dictates all of the features of the display device and is discussed in the Control Word section of this data sheet. The Character Generator converts the 7-bit ASCII data into the proper dot pattern for the 128 characters shown in the character set chart. The Clock Source can originate either from the internal oscillator clock or from an external source--usually from the output of another display in a multiple module array. The Display Multiplexer controls all display output to the digit drivers so no additional logic is required for a display system. The Column Drivers are connected directly to the display. The Display has four digits. Each of the four digits is comprised of 35 LEDs in a 5x7 dot array which makes up the alphanumeric characters. The intensity of the display can be varied by the Control Word in steps of 0% (Blank), 25%, 50%, and full brightness. Microprocessor Interface The interface to the microprocessor is through the address lines. (A0-A2), the data bus (D0-D7), two chip select lines (CE0, CE1), and read (RD) and write (WR) lines. The CE0 should be held low when executing a read, or write operation. CE1 must be held high. The read and write lines are both active low. During a valid read the data input lines (D0-D7) become outputs. A valid write will enable the data as input lines. Data input commands CEO CE1 1 0 0 0 0 0 0 0 1 1 1 1 1 1 RD X 0 1 1 1 1 1 WR X 1 0 0 0 0 0 A2 X 1 1 1 1 1 1 A1 X 0 0 0 1 1 0 A0 X 0 0 1 0 1 0 D7 X X 0 0 0 0 1 D6 X X 0 1 1 0 X D5 X X 1 0 1 1 X
Input Buffering If a cable length of 6 inches or more is used, all inputs to the display should be buffered with a tri-state non-inverting buffer mounted as close to the display as conveniently possible. Recommended buffers are: 74LS245 for the data lines and 74LS244 for the control lines. Figure 4. Block diagram
Display Memory Control (RAM) 4x8 Reg 1x8 14 128 Char ROM 128 x 5 8 4 CE0,CE1 A0-A2 RD, WR 7 Decode and Mux Output Control Logic 1 3 1 15
D0-D7
8
5
Output Latch 20 Column Drivers 3 20 Row Drivers
CLK SEL XCLK RST
OSC Logic
3
Display Multiplexer
Display
Figure 5. Mode selection CEO 0 1 X X CE1 1 X 0 X RD 0 X X 1 WR 0 X X 1 Operation None None None None
0=Low logic level, 1=High logic level, X=Don't care
D4 X X 0 1 0 1 X
D3 X X 0 0 0 0 X
D2 X X 1 1 1 0 X
D1 X X 0 1 1 1 X
D0 X X 0 1 0 1 X
Operation No Change Read Digit 0 Data to Bus ($) Written to Digit 0 (W) Written to Digit 1 (f) Written to Digit 2 (3) Written to Digit 3 Char. Written to Digit 0 and Cursor Enabled
PD2435/6/7, PD3535/6/7, PD4435/6/7
6
There are five registers within the display. Four of these registers are used to hold the ASCII/attribute code of the four display characters. The fifth register is the Control Word, which is used to blink, blank, clear, or dim the entire display, or to change the presentation (attributes) of individual characters. Addressing The addresses within the display device are shown below. Digit 0 is the rightmost digit of the display, while digit 3 is on the left. Although there is only one Control Word, it is duplicated at the four address locations 0-3. Data can be read from any of these locations. When one of these locations is written to, all of them will change together. Address A2 0 1 1 1 1 A1 X 0 0 1 1 A0 X 0 1 0 1 Control Word Digit 0 (rightmost) Digit 1 Digit 2 Digit 3 (leftmost) Contents
Control Word When address bit A2 is taken low, the Control Word is accessed. The same Control Word appears in all four of the lower address spaces of the display. Through the Control Word, the display can be cleared, the lamps can be tested, display brightness can be selected, and attributes can be set for any characters which have been loaded with their most significant bit (D7) set high. Brightness (D0, D1): The state of the lower two bits of the Control Word are used to set the brightness of the entire display, from 0% to 100%. The table below shows the correspondence of these bits to the brightness. D7 0 0 0 0 D6 0 0 0 0 D5 X X X X D4 X X X X D3 X X X X D2 X X X X D1 0 0 1 1 D0 0 1 0 1 Operation Blank 25% brightness 50% brightness Full brightness
X=don't care
Bit D7 of any of the display digit locations is used to allow an attribute to be assigned to that digit. The attributes are discussed in the next section. If Bit D7 is set to a one, that character will be displayed using the attribute. If bit D7 is cleared, the character will display normally. Control word format
D7 Clear D6 Lamp test D5 Blink D4 Attribute enable D3 Attributes D2
Attributes (D2-D4): Bits D2, D3, and D4 control the visual attributes (i.e., blinking) of those display digits which have been written with bit D7 set high. In order to use any of the four attributes, the Cursor Enable bit (D4 in the Control Word) must be set. When the Cursor Enable bit is set, and bit D7 in a character location is set, the character will take on one of the following display attributes.
D1
D0
Brightness D1 0 0 1 1 D0 0 1 0 1 Brightness 0% (blank) 25% 50% 100%
D3 D2 Attributes 0 0 Display Cursor instead of Character 0 1 Blink Character 1 0 Display Blinking Cursor instead of Character 1 1 Alternate Character with Cursor D4 Attribute enable 0 Disable above Attributes 1 Enable above Attributes D5 Blink 0 Blink Attribute Disabled 1 Blink Entire Display D6 Lamp test 0 Standard Operation 1 Display All Dots at 50% Brightness D7 Clear 0 Standard Operation 1 Clear Entire Display
PD2435/6/7, PD3535/6/7, PD4435/6/7
7
D7 0 0
D6 0 0
D5 0 0
D4 0 1
D3 X 0
D2 X 0
D1 B B
D0 B B
Operation Disable highlight attribute Display cursor* instead of character Blink single character Display blinking cursor* instead of character Alternate character with cursor*
D7 0
D6 0
D5 1
D4 X
D3 X
D2 X
D1 B
D0 B
Operation Blinking display
Lamp Test (D6): When the Lamp Test bit is set, all dots in the entire display are lit at half brightness. When this bit is cleared, the display returns to the characters that were showing before the lamp test. D7 0 D6 1 D5 0 D4 X D3 X D2 X D1 X D0 X Operation Lamp test
0 0
0 0
0 0
1 1
0 1
1 0
B B
B B
Clear Data (D7): When D7 is set (D7=1) in the Control Word, all (display) memory bits are reset to zero and the display goes blank. D7 1 D6 0 D5 X D4 X D3 X D2 X D1 X D0 X Operation Clear
0
0
0
1
1
1
B
B
*"Cursor"= all dots in a single character space lit to half brightness X=Don't care B=Depends on the selected brightness.
Attributes are non-destructive. If a character with bit D7 set is replaced by a cursor (Control Word bit D4 is set, and D3=D2=0) the character will remain in memory and can be revealed again by clearing D4 in the Control Word. Blink (D5): The entire display can be caused to blink at a rate of approximately 2 Hz by setting bit D5 in the Control Word. This blinking is independent of the state of D7 in all character locations. To synchronize the blink rate in a bank of these devices, it is necessary to tie all devices' clocks and resets together as described in a later section of this data sheet.
A second control word must be written into the chip with D7 reset (D7=0) to set up attributes and brightness levels. The SMC-4740 oscillator is designed to drive up to 16 displays with input loading of 15 pF each. The general requirements for cascading 16 displays are: 1. Determine the correct address for each display. 2. Tie CE0 to ground and use CE1 from an address. 3. Select one of the displays to provide the clock for the other displays. 4. Tie CLK SEL to ground on other displays. 5. Use RST to synchronize the blinking between the displays.
Figure 6. Cascading diagram
RST RD WR VCC WR RD RST CLK I/O CLKSEL 14 More Displays in between WR RD RST CLK I/O CLKSEL
Programmable Display D0-D7 A0-A2
Data I/O Address
Programmable Display D0-D7 A0-A2 CE0 CE1
CE0
CE1
A4 A5 A6 Address Decoder Address Decode Chip 1 to 14
PD2435/6/7, PD3535/6/7, PD4435/6/7
8
How to Load Information Into the Display Information loaded into the display can be either ASCII data or Control Word data. The following procedure (see also Typical Loading Sequence) will demonstrate a typical loading sequence and the resulting visual display. The word STOP is used in all of the following examples. Set Brightness Step 1 Set the brightness level of the entire display to your preference (example: 100%) Load Four Characters Step 2 Step 3 Step 4 Step 5 Load an "S" in the left hand digit. Load a "T" in the next digit. Load an "O" in the next digit. Load a "P" in the right hand digit. If you loaded the information correctly, the display now should show the word "STOP." Blink a Single Character Step 6 Into the digit, second from the right, load the hex code "CF," which is the code for an "O" with the D7 bit added as a control bit.
Note: The "O" is the only digit which has the control bit (D7) added to normal ASCII data.
Step 7
Load enable blinking character into the control word register. The display should show "STOP" with a flashing "O". Add Another Blinking Character Into the left hand digit, load the hex code "D3" which gives an "S" with the D7 bit added as a control bit. The display should show "STOP" with flashing "O" and a flashing "S." Alternate Character/Cursor Enable Load enable alternate character/cursor into the control word register. The display now should show "STOP" with the "O" and the "S" alternating between the letter and cursor (all dots lit). Initiate Four Character Blinking (Regardless of Control Bit setting)
Step 8
Step 9
Step 10
Load enable display blinking. The display now should show the entire word "STOP" blinking.
Typical loading sequence CEO 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. L L L L L L L L L L CE1 H H H H H H H H H H RD H H H H H H H H H H WR L L L L L L L L L L A2 L H H H H H L H L L A1 X H H L L L X H X X A0 X H L H L H X H X X D7 0 0 0 0 0 1 0 1 0 0 D6 0 1 1 1 1 1 0 1 0 0 D5 0 0 0 0 0 0 0 0 0 1 D4 0 1 1 0 1 0 1 1 1 0 D3 0 0 0 1 0 1 0 0 1 0 D2 0 0 1 1 0 1 1 0 1 0 D1 1 1 0 1 0 1 1 1 1 1 D0 1 1 0 1 0 1 1 1 1 1 S ST STO STOP STOP STO*P S*TO*P STOP S*T*O*P* Display
* Blinking character Character alternating with cursor (all dots lit)
PD2435/6/7, PD3535/6/7, PD4435/6/7
9
Electrical and Mechanical Considerations The CMOS IC of the display is designed to provide resistance to both Electrostatic Discharge Damage and Latch Up due to voltage or current surges. Several precautions are strongly recommended to avoid overstressing these built-in safeguards. ESD Protection Display users should be careful to handle the devices consistent with Standard ESD protection procedures. Operators should wear appropriate wrist, ankle or feet ground straps and avoid clothing that collects static charges. Work surfaces, tools and transport carriers that come into contact with unshielded devices or assemblies should also be appropriately grounded. Latch up Protection Latch up is a condition that occurs in CMOS ICs after the input protection diodes have been broken down. These diodes can be reversed through several means: VIN VCC + 0.5 V, or through excessive currents forced on the inputs. When these situations exist, the IC may develop the response of an SCR and begin conducting as much as one amp through the VCC pin. This destructive condition will persist (latched) until device failure or the device is turned off. The Voltage Transient Suppression Techniques and buffer interfaces for longer cable runs help considerably to prevent latch conditions from occurring. Additionally, the following Power Up and Power Down sequence should be observed. Power up Sequence 1. Float all active signals by tri-stating inputs to displays. 2. Apply VCC and GND to the display. 3. Apply active signals to the displays by enabling all input signals per application. Figure 7. Character set
D0 D1 D2 D3 D6 D5 D4 HEX ASCII CODE 0 0 0 0 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
Power Down Sequence 1. Float all active signals by tri-stating the inputs to the display. 2. Turn off the power to the display. Soldering Considerations These displays can be hand soldered with SN63 solder using a grounded iron set to 260C. Wave soldering is also possible following these conditions: Preheat that does not exceed 93C on the solder side of the PC board or a package surface temperature of 85C. Water soluble organic acid flux (except carboxylic acid) or resin-based RMA flux without alcohol can be used. Wave temperature is 245C 5C with a dwell between 1.5 seconds to 3.0 seconds. Exposure to the wave should not exceed temperatures above 260C, for 5 seconds at 0.063" below the seating plane. The packages should not be immersed in the wave. Voltage Transient Suppression It has become common practice to provide 0.01 F bypass capacitors liberally in digital systems. Like other CMOS circuitry, the Intelligent Display controller chip has very low power consumption and the usual 0.01 F would be adequate were it not for the LEDs. To prevent power supply transients, capacitors with low inductance and high capacitance at high frequencies are required. This suggests a solid tantalum or ceramic disc for high frequency bypass. For multiple display module systems distribute the bypass capacitors evenly, keeping capacitors as close to the power pins as possible. Use a 0.01 F capacitor for each display module and a 22 F for every third display module.
1 0 1 1 D
0 1 1 1 E
1 1 1 1 F
Notes: 1. A2 must be held high for ASCII data. 2. Bit D7=1 enables attributes for the assigned digit.
0
0
1
1
0
1
0
2
0
1
1
3
1
0
0
4
1
0
1
5
1
1
0
6
1
1
1
7
PD2435/6/7, PD3535/6/7, PD4435/6/7
10
Post Solder Cleaning Procedures The least offensive cleaning solution is hot D.l. water (60C) for less than 15 minutes. Addition of mild saponifiers is acceptable. Do not use commercial dishwasher detergents. For faster cleaning, solvents may be used. Carefully choose the solvents as some may chemically attack the package. Maximum exposure should not exceed two minutes at elevated temperatures. Acceptable solvents are: TF (trichlorotrifluoroethane), TA, 111 Trichloroethane, and unheated acetone. (1)
Note: 1) Acceptable commercial solvents are: Basic TF Arklone P. Genesolv D, Genesolv DA, BlacoTron TF, Blaco-Tron TA and, Freon TA.
Incandescent (with almost no green) or fluorescent (with almost no red) lights do not have the flat spectral response of sunlight. Plastic band-pass filters are inexpensive and effective in optimizing contrast ratios. The PD2435/3535/4435 is high efficiency red display and should be matched with a long wavelength pass filter in the 570 nm to 590 nm range. The PD2436/3536/4436 is a standard red display and should be matched with a long wavelength pass filter in the 600 nm to 620 nm range. The PD2437/3537/4437 should be matched with a yellow-green band-pass filter that peaks at 565 nm. For displays of multiple colors, neutral density grey filters offer the best compromise. Additional contrast enhancement can be gained through shading the displays. Plastic band-pass filters with built-in louvers offer the "next step up" in contrast improvement. Plastic filters can be further improved with anti-reflective coatings to reduce glare. The trade-off is "fuzzy" characters. Mounting the filters close to the display reduces this effect. Care should be taken not to overheat the plastic filters by allowing for proper air flow. Optimal filter enhancements for any condition can be gained through the use of circular polarized, anti-reflective, band-pass filters. The circular polarizing further enhances contrast by reducing the light that travels through the filter and reflects back off the display to less than 1%. Proper intensity selection of the displays will allow 10,000 foot candle sunlight viewability. Several filter manufacturers supply quality filter materials. Some of them are: Panelgraphic Corporation, W. Caldwell, NJ; SGL Homalite, Wilmington, DE; 3M Company, Visual Products Division, St. Paul, MN; Polaroid Corporation, Polarizer Division, Cambridge, MA; Marks Polarized Corporation, Deer Park, NY; Hoya Optics, Inc., Fremont, CA. One last note on mounting filters: recessing display and bezel assemblies is an inexpensive way to provide a shading effect in overhead lighting situations. Several Bezel manufacturers are: R.M.F. Products, Batavia, IL; Nobex Components, Griffith Plastic Corp., Burlingame, CA; Photo Chemical Products of California, Santa Monica, CA; I.E.E.Atlas, Van Nuys, CA. See Siemens Appnote 23 for further information.
Do not use solvents containing alcohol, methanol, methylene chloride, ethanol, TP35, TCM, TMC, TMS+, TE, and TES. Since many commercial mixtures exist, you should contact your preferred solvent vendor for chemical composition information. Some major solvent manufacturers are: Allied Chemical Corporation, Specialty Chemical Division, Morristown, NJ; BaronBlakeslee, Chicago, IL; Dow Chemical, Midland, Ml; E.l. DuPont de Nemours & Co., Wilmington, DE. For further information refer to Appnotes 18 and 19 in the current Siemens Optoelectronics Data Book. An alternative to soldering and cleaning the display modules is to use sockets. Naturally, 20 pin DIP sockets 0.600" wide with 0.100" centers work well for single displays. Multiple display assemblies are best handled by longer SIP sockets or DIP sockets when available for uniform package alignment. Socket manufacturers include: Aries Electronics, Inc., Frenchtown, NJ; Garry Manufacturing, New Brunswick, NJ; RobinsonNugent, New Albany, IN; and Samtec Electronic Hardware, New Albany, IN. For further information refer to Appnote 22 in the current Siemens Optoelectronics Data Book. Optical Considerations The character heights of these displays allows readability up to eight feet. Proper filter selection allows the user to build a display that can be used over this distance. Filters allow the user to enhance the contrast ratio between a lit LED and the character background. This will maximize discrimination of different characters as perceived by the display user. The only limitation is cost. So first consider the ambient lighting environment to maximize the cost benefit ratio for using filters.
PD2435/6/7, PD3535/6/7, PD4435/6/7
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