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STANDARD RED SCDV5540 YELLOW SCDV5541 HIGH EFFICIENCY RED SCDV5542 GREEN SCDV5543 HIGH EFFICIENCY GREEN SCDV5544 Vertical Format 0.123" 4-Character 5x5 Dot Matrix Serial Input Dot Addressable Intelligent Display(R) Devices
Dimensions in Inches (mm)
Z
0.188 (4.78) 0.784 (19.91)
SCDV554X SIEMENS YYWW
0.100 (2.54) non-cum. 12 plcs.
1.
0.150 (3.81)
0.400 .015 (10.16 .38)
0.160 (4.06) .020 (0.51)
0.200 (5.08)
FEATURES * Vertical Format, Four 0.123" (3.12 mm) 5x5 Dot Matrix Characters in Red, Yellow, High Efficiency Red, Green, or High Efficiency Green * Optimum Display Surface Efficiency (display area to package ratio) * High Speed Data Input Rate: 5 MHz * ROMless Serial Input, Dot Addressable Display Ideal for User Defined Characters * Built-in Decoders, Multiplexers and LED Drivers * Readable from 6 Feet (1.8 meters) * Wide Viewing Angle, X Axis 55, Y Axis 55 * Attributes: - 100 Bit RAM for User Defined Characters - Eight Dimming Levels - Power Down Model (<250 W) - Hardware/Software Clear Functions - Lamp Test - Internal or External Clock * 3.3 V Capability
1.
0.300 (7.62) .020 (0.51)
1. Dimension at Seating Plane 2. Display matrix & pins centered on the package outline. 3. Display matrix centered to pin array. 4. Tolerance: .XXX= .010 (.25)
DESCRIPTION The SCDV5540 (Red), SCDV5541 (Yellow), SCDV5542 (High Efficiency Red), SCDV5543 (Green), and SCDV5544 (High Efficiency Green) are four digit, dot addressable 5x5 dot matrix, serial input, alphanumeric Intelligent Display devices in a vertical format. The four digits are packaged in a rugged, high quality, optically transparent, plastic 14 pin DIP with 0.3" pin spacing. The on-board CMOS has a 100 bit RAM, one bit associated with one LED, each to generate User Defined Characters. In Power Down Mode, quiescent current is <50 A. The SCDV554X is designed for work with the serial port of most common microprocessors. Data is transferred into the display through the Serial Data Input (DATA), clocked by the Serial Data Clock (SDCLK), and enabled by the Load Input (LOAD). The Clock I/O (CLK I/O) and Clock Select (CLK SEL) pins offer the user the capability to supply a high speed external multiplex clock. This feature can minimize audio in-band interference for portable communication equipment or eliminate the visual sychronization effects found in high vibration environments such as avionic equipment.
1
Maximum Ratings DC Supply Voltage............................................ -0.5 to +7.0 Vdc Input Voltage Levels Relative to Ground................................................-0.5 to VCC +0.5 Vdc Operating Temperature ..................................... -40C to +85C Storage Temperature....................................... -40C to +100C Maximum Solder Temperature 0.063" below Seating Plane, t<5 sec ........................................260C Relative Humidity at 85C ................................................... 85% Maximum Number of LEDs at 100% Brightness....................64 Maximum Power Dissipation .......................................... 0.65 W ESD (100 pF, 1.5 K) ........................................................... 2 KV Maximum Input Current ............................................... 100 mA
Figure 3. Top view
1 14 Character 0
Character 3 7 8
Figure 1. Timing diagram--data write cycle
T LDS LOAD
T DS DATA
TLDH
D0 TDH
D7
SDCLK T SDCW T SDCLK
Figure 2. Timing diagram--instruction cycle
TWR TBL LOAD
SDCLK
DATA
D0
D1
D2
D3 OR
D4
D5
D6
D7
D0
LOAD
SDCLK
DATA
D0
D1
D2
D3
D4
D5
D6
D7
D0
SCDV5540/1/2/3/4
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Electrical characteristics (over operating temperature) Parameter VCC ICC (Pwr Dwn Mode) (4) ICC 4 digits 16 dots/character IIL Input current IIH Input current VIH VIL IOH (CLK I/O) IOL (CLK I/O) JC-PIN Fext External Clock Input Frequency Fosc Internal Clock Input Frequency Clock I/O Bus Loading Clock Out Rise Time Clock Out Fall Time FM, Digit 375 768 120 120 -8.9 1.6 64 347 347 240 500 500 1086 3.5 1.5 100 Min. 4.5 Typ. 5.0 Max. 5.5 50 140 -10 10 Units V A mA A A V V mA mA C/W KHz KHz pF ns ns Hz VCC=4.5 V, VOH=2.4 V VCC=4.5 V, VOH=0.4 V VCC=5.0 V, CLKSEL=0 VCC=5.0 V, CLKSEL=1 VCC=5.0 V, all inputs=0 V or VCC VCC=5 V, "#" displayed in all 4 digits at 100% brightness at 25C VCC=5 V, VIN=0 V (all inputs) VCC=VIN=5.0 V (all inputs) 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
Notes: 1) Peak current 5/3 x ICC. 2) Unused inputs must be tied high. 3) Contact Siemens for 3.3 volt operation. 4) External oscillator must be stopped if being used to maintain an ICC <50 A.
Input/Output Circuits Figures 4 and 5 show the input and output resistor/diode networks used for ESD protection and to eliminate substrate latch-up caused by input voltage over/under shoot. Figure 4. Inputs VCC input 1 K
GND Figure 5. lock I/O VCC
input/output
1 K
GND
SCDV5540/1/2/3/4
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Optical Characteristics at 25C (VCC=5.0 V at 100% brightness level, viewing angle: X axis 55, Y axis 65) Red SCDV5540 Description Luminous Intensity Character Average (# displayed all digits) Peak Wavelength Dominant Wavelength Yellow SCDV5541 Description Luminous Intensity Character Average (# displayed all digits) Peak Wavelength Dominant Wavelength High Efficiency Red SCDV5542 Description Luminous Intensity Character Average (# displayed all digits) Peak Wavelength Dominant Wavelength Green SCDV5543 Description Luminous Intensity Character Average (# displayed all digits) Peak Wavelength Dominant Wavelength High Efficiency Green SCDV5544 Description Luminous Intensity Character Average (# displayed all digits) Peak Wavelength Dominant Wavelength Symbol IV
(peak) (d)
Symbol IV
(peak) (d)
Min. 0.48
Typ. 1.8 665 639
Units mcd nm nm
Symbol IV
(peak) (d)
Min. 1.8
Typ. 5.4 583 585
Units mcd nm nm
Symbol IV
(peak) (d)
Min. 1.8
Typ. 5.4 630 620
Units mcd nm nm
Symbol IV
(peak) (d)
Min. 1.8
Typ. 5.4 565 570
Units mcd nm nm
Min. 2.1
Typ. 6.4 568 574
Units mcd nm nm
Notes: 1. Dot to dot intensity matching at 100% brightness is 1.8:1. 2. Displays are binned for hue at 2 nm intervals. 3. Displays within a given intensity category have an intensity matching of 1.5:1 (max.).
SCDV5540/1/2/3/4
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Pin assignment Pin 1 2 3 4 5 6 7 Function SDCLK LOAD NP NP NP RST GND Pin 14 13 12 11 10 9 8 Function GND DATA VCC VCC VCC CLKSEL CLK I/O
Pin definitions Pin 1 Function SDCLK Definitions Loads data into the 8-bit serial data register on a low to high transition. Low input enables data clocking into 8-bit serial shift register. When LOAD goes high, the contents of 8-bit serial Shift Register will be decoded. No pin No pin No pin Asynchronous input, when low will clear the Multiplex Counter, User RAM and Data Register. Control Word Register is set to 100% brightness and the Address Register is set to select Digit 0. The display is blanked. Power supply ground Outputs master clock or inputs external clock. H=internal clock, L=external clock Power supply Power supply Power supply Serial data input Power supply ground
2
LOAD
3 4
NP NP NP RST
Switching specifications (over operating temperature range and VCC=4.5 V to 5.5 V) Symbol TRC TLDS TDS TSDCLK TSDCW TLDH TDH TWR TBL Description Reset Active Time Load Setup Time Data Setup Time Clock Period Clock Width Load Hold Time Data Hold Time Total Write Time Time Between Loads Min. 600 50 50 200 70 0 25 2.2 600 Units ns ns ns ns ns ns ns s ns
5 6
7 8 9 10 11 12 13 14
GND CLK I/O CLK SEL VCC VCC VCC DATA GND
Note: TSDCW is the minimum time the SDCLK may be low or high. The SDCLK period must be a minimum of 200 ns.
Figure 6. Dot matrix format
0.095 (2.41)
Display column and row format C0
0.028 (0.71)
C1 1 0 0 0 0
C2 1 1 1 1 1
C3 1 0 0 0 0
C4 1 0 0 0 0
1=Display dot "On" 0=Display dot "Off'
Row 0 Row 1
1 0 0 0 0
0.123 (3.12)
Row 2 Row 3 Row 4
Dimensions in inches (mm) Tolerance: .XXX= .010 (.25)
Column data ranges Row 0 Row 1 Row 2 Row 3 Row 4 00H to 1FH 20H to 3FH 40H to 5FH 60H to 7FH 80H to 9FH
0.021 (0.53)
SCDV5540/1/2/3/4
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Operation of the SCDV554X The SCDV554X display consists of a CMOS IC containing control logic and drivers for four 5x5 characters. These components are assembled in a compact plastic package. Individual LED dot addressablity allows the user great freedom in creating special characters or mini-icons. The User Definable Character Set examples illustrate 200 different character and symbol possibilities. The serial data interface provides a highly efficient interconnection between the display and the mother board. The SCDV554X requires only four lines as compared to 15 for an equivalent four character parallel input part. Figure 7. SCDV554X block diagram
4 - 5X5 Characters 0 Row Decoder & Driver 1 2 10 3
The on-board CMOS IC is the electronic heart of the display. The IC accepts decoded serial data, which is stored in the internal RAM. Asynchronously the RAM is read by the character multiplexer at a strobe rate that results in a flicker free display. Figure 7 shows the three functional areas of the IC. These include: the input serial data register and control logic, a 100 bits two port RAM, and an internal multiplexer/display driver.
-- 10 Column Logic & Driver Counter Chain & Timing Logic Brightness & Lamp Test Oscillator Power Down
Mux CLK I/O Mux Clock SEL RESET
Serial Data Serial Data Clock 5-- D7 D6 D5 OPCODE --3 Load OPCODE Decode D4 D3 D2 D1 D0 DATA --5 Character Address Register 5--
Display Multiplexer
WRITE Character / Row Address Decode
Control Word Address Register
Software Clear
4--
Column Output
RAM 100 Bits WRITE 20 X 5 READ 10 X 10
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The following explains how to format the serial data to be loaded into the display. The user supplies a string of bit mapped decoded characters. The contents of this string is shown in Figure 8a. Figure 8b shows that each character consists of six 8 bit words. The first word encodes the display character location and the succeeding five bytes are row data. The row data represents the status (On, Off) of individual column LEDs. Figure 8c shows that each that each 8 bit word is formatted to include a three bit Operational Code (OPCODE) defined by bits D7-D5 and five bits (D4-D0) representing Column Data, Character Address, or Control Word Data. Figure 8d shows the sequence for loading the bytes of data. Bringing the LOAD line low enables the serial register to accept data. The shift action occurs on the low to high transition of the serial data clock (SDCLK). The least significant bit (D0) is loaded first. After eight clock pulses the LOAD line is brought high. With this transition the OPCODE is decoded. The decoded OPCODE directs D4-D0 to be latched in the Character Address register, stored in the RAM as Column data, or latched in the Control Word register. The control IC requires a minimum 600 ns delay between successive byte loads. As indicated in Figure 8a, a total of 264 bits of data are required to load all eight characters into the display. Figure 8. Loading serial character data
The Character Address Register bits, D4-D0 (Table 2), and Row Address Register bits, D7-D5 (Table 3), direct the Column Data bits, D4-D0 (Table 3) to specific RAM location. Table 1 shows the Row Address for the example character "D." Column data is written and read asynchronously from the 200 bit RAM. Once loaded the internal oscillator and character multiplexer reads the data from the RAM. These characters are row strobed with column data as shown in Figures 9 and 10. The character strobe rate is determined by the internal or user supplied external MUX Clock and the IC's / 320 counter. Table 1. Character "D" Op code D7 D6 D5 Row 0 Row 1 Row 2 Row 3 Row 4 0 0 0 0 1 0 0 1 1 0 0 1 0 1 0 Column Data D4 D3 D2 D1 D0 C0 C1 C2 C3 C4 1 1 1 1 1 1 0 0 0 1 1 0 0 0 1 1 0 0 0 1 0 1 1 1 0 Hex
1E 31 51 71 9E
Example: Serial Clock = 5MHz, Clock Period = 200ns
264 Clock Cycles, 52.8 s
a.
Character 0
Character 1
Character 2
Character 3
66 Clock Cycles, 13.2s
b.
Character 0 Address
Row 0 Column Data
Row 1 Column Data
Row 2 Column Data
Row 3 Column Data
Row 4 Column Data
11 Clock Cycles, 2.2s Character Address OPCODE D5 1 D6 0 D7 0 Time Between Loads 600ns(min)
11 Clock Cycles, 2.2s Column Data D0 C4 D1 C3 D2 C2 D3 C1 D4 C0 OPCODE D5 D6 D7 Time Between Loads 600ns(min)
c.
D0 0
D1 0
D2 0
D3 0
D4 0
LOAD
Serial Clock DATA
Clock Period
d.
D0 t0 D1 D2 D3 D4 D5 D6 D7 Time between LOADS
SCDV5540/1/2/3/4
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Table 2. Load character address Op code D7 D6 D5 1 1 1 1 0 0 0 0 1 1 1 1 Character Address D4 D3 D2 D1 D0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 1 Hex A0 A1 A2 A3 Operation Load Character 0 Character 1 Character 2 Character 3
Table 4. Display brightness Op code D7 D6 D5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Control Word D4 D3 D2 D1 D0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 Hex F0 F1 F2 F3 F4 F5 F6 Operation Level 100% 53% 40% 27% 20% 13% 6.6%
Table 3. Load column data Op code D7 D6 D5 0 0 0 0 1 0 0 1 1 0 0 1 0 1 0 Column Data D4 D3 D2 D1 D0 C0 C1 C2 C3 C4 C0 C1 C2 C3 C4 C0 C1 C2 C3 C4 C0 C1 C2 C3 C4 C0 C1 C2 C3 C4 Operation Load Row 0 Row 1 Row 2 Row 3 Row 4
1 1
The SCDV554X offers a unique Display Power Down feature which reduces ICC to less than 50 A. When FFHEX is loaded (Table 5) the display is set to 0% brightness and the internal multiplex clock is stopped. When in the Power Down mode data may still be written into the RAM. The display is reactivated by loading a new rightness Level Control Word into the display. Table 5. Power down Op code D7 D6 D5 1 1 1 Control Word D4 D3 D2 D1 D0 1 1 1 1 1 Hex FF Operation Level 0% brightness
The user can activate four Control functions. These include: LED Brightness Level, Lamp Test, IC Power Down, or Display Clear. OPCODEs and five bit words are used to initiate these functions. The OPCODEs and Control Words for the Character Address and Loading Column Data are shown in Tables 2 and 3. The user can select seven specific LED brightness levels, Table 4. These brightness levels (in percentages of full brightness of the display) include: 100% (F0 HEX), 53% (F1HEX), 40% (F2HEX), 27% (F3HEX), 20% (F4HEX), 13% (F5HEX), and 6.6% (F6HEX). The brightness levels are controlled by changing the duty factor of the row strobe pulse. Figure 9. Row and column locations
The Lamp Test is enabled by loading F8 HEX, Table 6, into the serial shift register. This Control Word sets all of the LEDs to a 53% brightness level. Operation of the Lamp Test has no affect on the RAM and is cleared by loading a Brightness Control Word. Table 6. Lamp test Op code D7 D6 D5 1 1 1 1 1 Control Word D4 D3 D2 D1 D0 1 1 0 1 B 0 B 0 B 0 F8 Hex Operation Level Lamp Test (OFF) Lamp Test (ON)
Row 0 Row 1 Row 2 Row 3 Row 4 01234 Columns
off LED on LED Previously "on" LED
1
The Software Clear (C0 HEX), given in Table 7, clears the Address Register and the RAM. The display is blanked and the Character Address Register will be set to Character 0. The internal counter and the Control Word Register are unaffected. The Software Clear will remain active until the next data input cycle is initiated. Table 7. Software clear Op code D7 D6 D5 1 1 0 Control Word D4 D3 D2 D1 D0 0 0 0 0 0 Hex C0 Operation Level CLEAR
SCDV5540/1/2/3/4
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Figure 10. Row strobing
ROW LOAD
LOAD ROW 0
Row 0 Row 1 Row 2 Row 3 Row 4
Column 0 Column 1 Column 2 Column 3 Column 4
LOAD ROW 1
Row 0 Row 1 Row 2 Row 3 Row 4
Column 0 Column 1 Column 2 Column 3 Column 4
LOAD ROW 2
Row 0 Row 1 Row 2 Row 3 Row 4
Column 0 Column 1 Column 2 Column 3 Column 4
LOAD ROW 3
LOAD ROW 4
Row 0 Row 1 Row 2 Row 3 Row 4
Row 0 Row 1 Row 2 Row 3 Row 4
Multiplexer and Display Driver The four characters are row multiplexed with RAM resident column data. The strobe rate is established by the internal or external MUX Clock rate. The MUX Clock frequency is divided by a 320 counter chain. This results in a typical strobe rate of 750 Hz. By pulling the Clock SEL line low, the display can be operated from an external MUX Clock. The external clock is attached to the CLK I/O connection (pin 8). The maximum external MUX Clock frequency should be limited to 1 MHz. An asynchronous hardware Reset (pin 9) is also provided. Bringing this pin low will clear the Character Address Register, Control Word Register, RAM, and blanks the display. This action leaves the display set at Character Address 0, and the Brightness Level set at 100%. Electrical & Mechanical Considerations Interconnect Considerations Optimum product performance can be had when the following electrical and mechanical recommendations are adopted. The SCDV554X's IC is constructed in a high speed CMOS process, consequently high speed noise on the SERIAL DATA, SERIAL DATA CLOCK, LOAD and RESET lines may cause incorrect data to be written into the serial shift register. Adhere to transmission line termination procedures when using fast line drivers and long cables (>10 cm). Good digital grounds (pins 7 and 14) and power supply decoupling (pins 11 and 12) will insure that ICC (<400 mA peak) switching currents do not generate localized ground bounce. Therefore it is recommended that each display package use a 0.1 F and 20 F capacitor between VCC and ground. When the internal MUX Clock is being used connect the CLKSEL pin to VCC. In those applications where RESET will not be connected to the system's reset control, it is recommended that this pin be connected to the center node of a series 0.1, F and 100 K RC network. Thus upon initial power up the RESET will be held low for 10 ms allowing adequate time for the system power supply to stabilize.
ESD Protection The input protection structure of the SCDV5540/1/2/3/4 provides significant protection against ESD damage. It is capable of withstanding discharges greater than 2 KV. Take all the standard precautions, normal for CMOS components. These include properly grounding personnel, tools, tables, and transport carriers that come in contact with unshielded parts. If these conditions are not, or cannot be met, keep the leads of the device shorted together or the parts in anti-static packaging. Soldering Considerations The SCDV5540/1/2/3/4 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 of 245C 5C with a dwell between 1.5 sec. to 3.0 sec. Exposure to the wave should not exceed temperatures above 260C for five seconds at 0.063" below the seating plane. The packages should not be immersed in the wave. Post Solder Cleaning Procedures The least offensive cleaning solution is hot D.I. 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. Exercise care in choosing solvents as some may chemically attack the nylon package. For further information refer to Appnotes 18 and 19 in the current Siemens Optoelectronic Data Book. See Appnote 19, Table 2, "Displays-Group 2" for the SCDV554X. An alternative to soldering and cleaning the display modules is to use sockets. Naturally, 14 pin DIP sockets .300" wide with .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 are Aries Electronics, Inc., Frenchtown, NJ; Garry Manufacturing, New Brunswick, NJ; Robinson-Nugent, New Albany, IN; and Samtec Electronic Hardward, New Albany, IN. For further information refer to Appnote 22 in the current Siemens Optoelectronic Data Book.
SCDV5540/1/2/3/4
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Column 0 Column 1 Column 2 Column 3 Column 4
Column 0 Column 1 Column 2 Column 3 Column 4
Optical Considerations The 0.123" high character of the SCDV554X gives readability up to five feet. Proper filter selection enhances readability over this distance. Using filters emphasizes the contrast ratio between a lit LED and the character background. This will increase the discrimination of different characters. The only limitation is cost. Take into consideration the ambient lighting environment for the best cost/benefit ratio for filters. 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 an inexpensive and effective way to strengthen contrast ratios. The SCDV5540/2 are red/high efficiency red displays and should be matched with long wavelength pass filter in the 570 nm to 590 nm range. The SCDV5543/4 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 is gained by shading the displays. Plastic band-pass filters with built-in louvers offer the next step up in contrast improvement. Plastic filters can be improved further with anti-reflective coatings to reduce glare. The trade-off is fuzzy characters. Mounting the filters close to the display reduces this effect. Take care not to overheat the plastic filter by allowing for proper air flow. Optimal filter enhancements are gained by using 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%. 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 displays 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.
Figure 11. SCDV interface to Siemens/Intel 8031 microprocessor (using serial port in mode 0)
VCC 18 40 VCC 1 SDCLK GND 2 LD DATA VCC ID VCC VCC CS 6 RST 7 GND CLK I/O 14 13 12 11 10 9 8
10 XTAL2 RXD TXD 11
VCC
19 XTAL1 U1 8031 P3.7 17 9 RST P3.3 13 P3.4 14
22 f TAN +
.01 f
Figure 12. SCDV interface to Siemens/Intel 8031 microprocessor (using one bit of parallel port as serial input) VCC VCC 40 P3.0 10 18 XTAL2 P3.1 11 1 SDCLK GND 14 P3.6 16 2 LD DATA 13 22 F 39 VCC 12 TAN P0.0 ID VCC 11 + 19 XTAL1 VCC 10 U1 VCC CS 9 6 RST 8031 7 GND CLK I/O 8 .01 F 1 RST 9 P1.0
20
SCDV5540/1/2/3/4
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Microprocessor Interface The microprocessor interface is through the serial port, SPI port or one out of eight data bits on the eight bit parallel port and also control lines SDCLK and LOAD. Power Up Sequence Upon power up display will come on at random. Thus the display should be reset at power-up. The reset will set the Address Register to Digit 0, User RAM is set to 0 (display blank) the Control Word is set to 0 (100% brightness with Lamp Test off) and the internal counters are reset. Cascading Multiple Displays Multiple displays can be cascaded using the CLK SEL and CLK I/O pins as shown below. The display designated as the Master Clock source should have its CLK SEL pin tied high and the slaves should have their CLK SEL pins tied low. All CLK I/O pins should be tied together. One display CLK I/O can drive 15 slave CLK I/Os. Use RST to synchronize all display counters. Figure 13. SCDV554X interface with Motorola 68HC05C4 microprocessor (using SPI port) VCC
VCC 38 40 OSC1 PA0 PA1 SCLK MOSI 11 10 33 32 1 SDCLK GND 2 LD DATA VCC ID VCC VCC RST CS 6 7 GND CLK I/O 14 13 12 11 10 9 8
22 F TAN +
39 OSC2 VCC
U1 68HC05C4 1 RST 9 PA2 20
.01 F
Figure 14. Cascading multiple displays
RST VCC RST CLK I/O CLK SEL RST CLK I/O CLK SEL
Intelligent Display DATA SDCLKLOAD DATA SDCLK A0 A1 A2 A3 LD 0 Chip Address Decoder 15 CE
14 more displays in between
Intelligent Display DATA SDCLK LOAD
Address Decode 1-14
SCDV5540/1/2/3/4
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Loading Data into the Display Use following procedure to load data into the display: 1. Power up the display. 2. Bring RST low (600 ns duration minimum) to clear the Multiplex Counter, Address Register, Control Word Register, User Ram and Data Register. The display will be blank. Display brightness is set to 100%. 3. If a different brightness is desired, load the proper brightness opcode into the Control Word Register. 4. Load the Digit Address into the display. 5. Load display row and column data for the selected digit. 6. Repeat steps 4 and 5 for all digits. Data contents for the display in a vertical format "AB"
Step A B (optional) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 D7 D6 1 1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 1 1 1 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 D5 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 D4 D3 0 1 0 0 0 1 0 0 0 0 0 1 1 1 0 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 1 1 1 1 1 0 0 0 0 1 0 D2 0 B 0 1 1 1 1 1 0 1 0 1 0 0 0 1 0 1 0 1 0 1 1 1 1 1 D1 0 B 0 0 1 0 0 0 0 0 1 1 0 0 1 1 0 1 0 1 1 0 0 0 1 0 D0 0 B 0 0 0 1 0 0 1 0 0 1 1 1 0 0 1 0 1 0 1 0 0 1 0 0 Function CLEAR BRIGHTNESS SELECT DIGIT D0 SELECT ROW 0 D0 () ROW 1 D0 () ROW 2 D0 () ROW 3 D0 () ROW 4 D0 () DIGIT D1 SELECT ROW 0 D1 (A) ROW 1 D1 (A) ROW 2 D1 (A) ROW 3 D1 (A) ROW 4 D1 (A) DIGIT D2 SELECT ROW 0 D2 (B) ROW 1 D2 (B) ROW 2 D2 (B) ROW 3 D2 (B) ROW 4 D2 (B) DIGIT D3 SELECT ROW 0 D3 () ROW 1 D3 () ROW 2 D3 () ROW 3 D3 () ROW 4 D3 ()
Note: If the display is already reset at Power Up, there is no need for Software Clear.
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User Definable Character Set Examples* Upper and lower case alphabets
HEX CODE 04 2A 5F 71 91 01 21 41 71 8E 0F 30 4E 61 9E 00 2E 52 72 8D 00 26 42 72 8C 00 23 44 62 8C HEX CODE 1E 29 4E 69 9E 13 34 58 74 93 1F 24 44 64 84 10 30 5E 71 9E 10 30 56 78 96 08 3C 48 6A 84 DOT ON = 1 DOT OFF = 0 HEX CODE 0F 30 50 70 8F 10 30 50 70 9F 11 31 51 71 8E 00 2F 50 70 8F 0C 24 44 64 8E 00 32 52 72 8D HEX CODE 1E 29 49 69 9E 11 3B 55 71 91 11 31 51 6A 84 01 21 4F 71 8F 00 2A 55 71 91 00 31 51 6A 84 HEX CODE 1F 30 5E 70 9F 11 39 55 73 91 11 31 55 7B 91 00 2E 5F 70 8E 00 36 59 71 91 00 31 55 7B 91 HEX CODE 1F 30 5E 70 90 0E 31 51 71 8E 11 2A 44 6A 91 04 2A 48 7C 88 00 2E 51 71 8E 00 32 4C 6C 92 HEX CODE 0F 30 53 71 8F 1E 31 5E 70 90 11 2A 44 64 84 00 2F 50 73 8F 00 3E 51 7E 90 00 31 4A 64 98 HEX CODE 11 31 5F 71 91 0C 32 56 72 8D 1F 22 44 68 9F 10 30 56 79 91 00 2F 51 6F 81 00 3E 44 68 9E 04 20 4C 64 8E 00 33 54 78 90 HEX CODE 0E 24 44 64 8E 1E 31 5E 74 92
Numerals and punctuation
HEX CODE 0E 33 55 79 8E 0E 31 4F 62 8C 0C 2C 48 64 80 10 28 44 62 81 0E 31 42 64 88 HEX CODE 04 2C 44 64 8E 0A 3F 4A 7F 8A 04 24 5F 64 84 1C 24 44 64 9C 06 24 48 64 86 DOT ON = 1 DOT OFF = 0 HEX CODE 1E 21 46 68 9F 0F 34 4E 65 9E 00 2C 4C 64 88 0E 35 57 70 8E 0C 24 42 64 8C HEX CODE 1E 21 4E 61 9E 06 29 5C 68 9F 00 20 5F 60 80 00 20 40 60 9F 04 24 40 64 84 HEX CODE 06 2A 5F 62 82 19 3A 44 6B 93 00 20 40 6C 8C 0C 2C 40 6C 8C 11 2A 44 6E 84 HEX CODE 1F 30 5E 61 9E 08 34 4D 72 8D 01 22 44 68 90 0C 20 4C 64 88 15 2E 5F 6E 95 HEX CODE 06 28 5E 71 8E 0C 2C 44 68 80 04 24 44 60 84 02 24 48 64 82 04 2A 51 60 80 HEX CODE 1F 22 44 68 88 02 24 44 64 82 0A 2A 40 60 80 00 3F 40 7F 80 08 35 42 60 80 HEX CODE 0E 31 4E 71 8E 08 24 44 64 88 07 24 44 64 87 08 24 42 64 88
*CAUTION: No more than 128 LEDs "on" at one time at 100% brightness.
SCDV5540/1/2/3/4
13
User Definable Character Set Examples* (continued) Scientific notations, etc.
HEX CODE 06 2E 5E 6E 86 10 3C 52 72 81 1F 28 44 68 9F 00 24 4E 7F 8E 04 22 5F 62 84 00 27 4F 78 9C HEX CODE 04 24 48 71 8E 0E 31 5F 71 8E 18 24 48 7C 80 00 2E 5F 6E 84 04 28 5F 68 84 00 3C 5F 63 87 DOT ON = 1 DOT OFF = 0 HEX CODE 1F 20 59 75 93 10 28 44 6A 91 1C 28 44 78 80 0E 3F 4E 64 80 1F 31 51 71 9F 00 20 40 60 83 HEX CODE 1F 20 56 79 91 09 29 49 6E 90 12 36 5A 67 80 04 3E 5F 7E 84 08 2C 4A 78 98 00 20 40 67 9F HEX CODE 0E 20 4A 64 8A 01 2E 54 64 84 06 21 5A 67 80 04 2F 5F 6F 84 0A 35 4A 75 8A 00 23 5F 7F 9F HEX CODE 0D 32 52 72 8D 04 2E 55 6E 84 07 22 59 66 80 0E 2E 4E 6E 8E 15 2A 55 6A 95 0C 3C 5C 7C 9C HEX CODE 0C 32 56 71 96 0E 31 51 6A 9B 1C 34 5C 60 80 00 3F 5F 7F 80 1F 35 5F 75 9F 15 2E 44 64 84 HEX CODE 0E 24 4E 71 8E 01 2E 5A 6A 8A 0F 28 48 78 88 04 2E 55 64 84 00 3F 5F 7C 80 HEX CODE 00 24 4A 71 9F 0F 32 52 72 8C 04 2E 5F 6E 80 04 24 55 6E 84 0E 3F 5B 7F 8E
Foreign characters
HEX CODE 1F 21 5F 62 84 08 3F 49 69 92 15 35 55 62 8C 10 3F 50 70 8F 12 32 52 64 88 0A 2E 51 7F 91 HEX CODE 1F 21 46 64 88 04 3F 44 7F 84 0E 20 5F 64 98 1F 21 41 62 8C 04 34 54 75 96 02 24 4C 64 8E DOT ON = 1 DOT OFF = 0 HEX CODE 01 22 46 6A 82 0F 29 51 62 8C 08 28 4C 6A 88 0E 20 4E 60 8F 1E 25 4F 74 8F 04 2A 4E 71 8E HEX CODE 04 3F 51 61 86 08 2F 52 62 82 04 3F 44 64 98 04 28 51 7F 81 0F 34 5F 74 97 0A 34 52 7A 96 HEX CODE 00 3F 44 64 9F 0F 21 41 61 9F 0E 20 40 60 9F 01 21 4A 64 8A 0F 30 4F 64 98 08 24 51 71 8E HEX CODE 02 3F 46 6A 92 0A 3F 4A 62 8C 1F 21 4A 64 9A 1F 28 5F 68 87 0F 33 55 79 9E 02 24 51 71 8E HEX CODE 08 3F 49 6A 88 19 21 59 62 9C 04 3E 44 6E 95 1E 22 42 62 9F 0F 34 57 74 8F 04 2A 51 71 8E HEX CODE 1F 21 45 67 8C 0F 29 55 63 8C 04 24 44 68 90 1F 21 5F 61 9F 00 2A 5F 74 8B HEX CODE 02 3F 51 62 8C 01 3E 42 7F 86 04 22 51 71 91 0E 20 5F 61 8E 08 24 4E 72 8F
*CAUTION: No more than 128 LEDs "on" at one time at 100% brightness.
SCDV5540/1/2/3/4
14

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