PDSP1881

4.70 mm (0.180’’) 8-Character 5x7 Dot Matrix Alphanumeric Programmable Display™ Lead (Pb) Free Product - RoHS Compliant Red Yellow High Efficiency Red Green High Efficiency Green PDSP1880 PDSP1881 PDSP1882 PDSP1883 PDSP1884 DESCRIPTION FEATURES • Eight 4.70 mm (0.180") Dot Matrix Characters in Red, Yellow, High Efficiency Red, Green, or High Efficiency Green • Built-in 128 Character ROM, Mask Programmable for Custom Fonts • Readable from 2.5 meters (8 Feet) • Built-in Decoders, Multiplexers and Drivers • Wide Viewing Angle, X Axis ± 55°, Y Axis 65° • Programmable Features: – Individual Flashing Character – Full Display Blinking – Multi-Level Dimming and Blanking – Clear Function – Self Test • Internal or External Clock • End Stackable Dual-In-Line Plastic Package • Read/Write Capability • 16 User Definable Characters The PDSP1880 (Red), PDSP1881 (Yellow), PDSP1882 (High Efficiency Red), PDSP1883 (Green), and PDSP1884 (High Efficiency Green) are eight digit, 5 x 7 dot matrix, alphanumeric Programmable Displays. The 4.70 mm (0.180’’) high digits are packaged in a rugged, high quality, optically transparent, 7.62 mm (0.300’’) lead spacing, 30 pin plastic DIP. The on-board CMOS has a built-in 128 character ROM. The PDSP188X also has a user definable character (UDC) feature, which uses a RAM that permits storage of 16 arbitrary characters, symbols or icons that are software-definable by the user. The character ROM itself is mask programmable and easily modified by the manufacturer to provide specified custom characters. The PDSP188X is designed for standard microprocessor interface techniques, and is fully TTL compatible. The Clock I/O and Clock Select pins allow the user to cascade multiple display modules. ESD Warning: 2006-03-30 Standard precautions for CMOS handling should be observed. 1 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Ordering Information Type Color of Emission Character Height mm (inch) PDSP1880 red PDSP1881 yellow PDSP1882 high efficiency red PDSP1883 green Q68000A9108 PDSP1884 high efficiency green Q68000A9109 Q68000A9105 Q68000A9106 4.70 (0.180) V Y Pin 15 5.08 (0.200) 0.46 (0.018) typ. 10.16 (0.400) 2.54 (0.100) typ. ±0.13 (0.005) CL 5.33 (0.210) PDSP188X Z YYWW OSRAM Pin 16 Color Code Pin 15 LI Code CL 4.01 (0.158) typ. Date Code 0.25 (0.010) Dimensions in mm (inch) Pin 1 Identifier 0.51 (0.020) Q68000A9107 1.52 (0.060) ref. Package Outlines Pin 1 Indicator Ordering Code 5.71 (0.225) 0.3 (0.012) typ. 7.62 (0.300) (Tol. non cum.) 1 2 3 4.57 (0.180) 11.43 (0.450) max. 0 5.36 (0.211) 2.68 (0.105) 2.29 (0.090) 42.93 (1.690) max. 2.54 (0.100) CL 4 5 6 CL Pin 1 Identifier 2006-03-30 7 IDOD5014 2 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Maximum Ratings (TA=25°C) Parameter Symbol Value Unit Operating temperature range Top – 40 … + 85 °C Storage temperature range Tstg – 55 … + 100 °C DC Supply Voltage, VCC to GND (max. voltage with no LEDs on) VCC -0.3 to + 7.0 V Operating Voltage, VCC to GND (max. voltage with 20 dots/digits on) 5.5 V Input Voltage Levels, all inputs -0.3 to VCC + 0.3 V 260 °C 85 % 4.0 kV Solder Temperature 1.59 mm (0.063“) below seating plane, t < 5.0 s TS Relative Humidity (non-condensing) ESD (100 pF, 1.5 kΩ) (each pin) VZ Optical Characteristics at 25°C (VCC=5.0 V at 100% brightness level) 2006-03-30 Green PDSP1883 High Efficiency Green PDSP1884 Dominant Wavelength Unit High Efficiency Red PDSP1882 Peak Wavelength Values Yellow PDSP1881 Peak Luminous Intensity Symbol Red PDSP1880 Description (min.) IVpeak (typ.) 70 125 125 205 125 350 125 275 125 500 µcd/dot µcd/dot (typ.) λpeak 660 583 630 565 568 nm (typ.) λdom 639 585 626 570 574 nm 3 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Enlarged Character Format Dimensions in mm (inch) Switching Specifications (over operating temperature range and VCC=4.5 V) Symbol Description Min. Units Tacc Display Access Time—Write 210 ns Tacc Display Access Time—Read 230 ns R1 Tacs Address Setup Time to CE 10 ns R2 Tce Chip Enable Active Time—Write 140 ns Tce Chip Enable Active Time—Read 160 ns Tach Address Hold Time to CE 20 ns Tcer Chip Enable Recovery Time 60 ns Tces Chip Enable Active Prior to Rising Edge—Write 140 ns Tces Chip Enable Active Prior to Rising Edge—Read 160 ns Tceh Chip Enable Hold to Rising Edge of Read/Write Signal 0 ns Tw Write Active Time 100 ns Twd Data Valid Prior to Rising Edge of Write Signal 50 ns Tdh Data Write Time 20 ns Tr Chip Enable Active Prior to Valid Data 160 ns Trd Read Active Prior to Valid Data 95 ns Tdf Read Data Float Delay 10 ns Trc Reset Active Time 300 ns R3 R4 R5 4.52 (0.178) C0 C1 C2 C3 C4 0.254 (0.010) typ. 0.71 (0.028) typ. 2.49 (0.098) R6 R7 0.56 (0.022) typ. IDOD5015 Write Cycle Timing Diagram Tacc A0-A3 FL Tacs Tach Tacs Tce Tcer CE Tceh Tces Tw WR Twd Tdh D0-D7 2006-03-30 4 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Read Cycle Timing Diagram Tacc A0-A3 FL Tacs Tach Tacs Tce Tcer CE Tceh Tces Tr RD Trd Tdf D0-D7 Character Set D0 D1 D2 D3 D7 D6 D5 D4 HEX ASCII CODE L L L L 0 L L L H 1 L L H L 2 L L H H 3 L H L L 4 L H L H 5 L H H L 6 L H H H 7 H X X X 8 L L L L 0 H L L L 1 L H L L 2 H H L L 3 L L H L 4 H L H L 5 L H H L 6 H H H L 7 L L L H 8 H L L H 9 L H L H A H H L H B L L H H C H L H H D L H H H E H H H H F UDC UDC UDC UDC UDC UDC UDC UDC UDC UDC UDC UDC UDC UDC UDC UDC 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 IDCS5086 Notes: 1. Upon power up, the device will initialize in a random state. 2. X=don’t care. 2006-03-30 5 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 DC Electrical Characteristics at 25°C Parameters Limits Conditions Min. Typ. Max. Units VCC 4.5 5.0 5.5 V — ICC Blank — 0.65 1.0 mA VCC=5.0 V, VIN=5.0 V ICC 12 dots/digit on1) 2) — 200 255 mA VCC=5.0 V, “V” in all 8 digits ICC 20 dots/digit on1) 2) — 300 370 mA VCC=5.0 V, “#” in all 8 digits IILP (with pull-up) Input Leakage –18 –11 –5.0 µA VCC=5.0 V, VIN=0 V to VCC IIL (no pull-up) Input Leakage –1.0 — +1.0 µA VCC=5.0 V, VIN=5.0 V (CLK, A0–A3, D0–D7) VIH Input Voltage High 2.0 — VCC +0.3 V VCC=4.5 V to 5.5 V VIL Input Voltage Low GND –0.3 — — V VCC=4.5 V to 5.5 V VOL (D0–D7), Output Voltage Low — — 0.4 V VCC=4.5 V, IOL=1.6 mA VOL (CLK), Output Voltage Low — — 0.4 V VCC=4.5 V, IOL=40 µA VOH Output Voltage High 2.4 — — V VCC=4.5 V, IOH=40 µA θJC Thermal Resistance, Junction to Case — 25 — °C/W — Clock I/O Frequency 28 57.34 81.14 kHz VCC=4.5 to 5.5 V FM, Digit Multiplex Frequency 125 256 362.5 Hz VCC=4.5 to 5.5 V Blinking Rate 0.98 2.0 2.83 Hz — Clock I/O Buss Loading — — 2.40 pF — Clock Out Rise Time — — 500 nsec VCC=4.5 V, VOH=2.4 V Clock Out Fall Time — — 500 nsec VCC=4.5 V, VOH=0.4 V (WR, CE, FL, RST, RD, CLKSEL) Notes: 1) ICC is an average value. 2) ICC is measured with the display at full brightness. Peak ICC= 28/15 ICC average (#displayed). Recommended Operating Conditions (TA = – 40°C to + 85°C) Parameter Symbol Min. Max. Units Supply Voltage VCC 4.5 5.5 V Input Voltage Low VIL — 0.8 V Input Voltage High VIH 2.0 — V Output Voltage Low VOL — 0.4 V Output Voltage High VOH 2.4 — V 2006-03-30 6 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Top View 0 Pin Assignments 1 2 3 4 5 6 7 Pin # Name Symbol Definition 16 Supply ground GNDsup Analog ground for LED drivers 17 — NC No connection 18 Logic ground GNDlog Logic ground for digital circuitry 19 Read RD Reads data from display when RD=0. Also CE=0. 20 Data bit zero D0 Least significant data bit. 21 Data bit one D1 Second data bit. 22–24 No pins — No connections 25 Data bit two D2 Third data bit. 26 Data bit three D3 Fourth data bit. 27 Data bit four D4 Fifth data bit. 28 Data bit five D5 Sixth data bit. 29 Data bit six D6 Seventh data bit. 30 Data bit seven D7 Most significant data bit. IDPA5110 Pin Assignments Pin # Name Symbol Definition 1 Reset RST Initializes display; clears Character RAM (20H), Flash RAM (00H), control word (00H), and resets internal counters. UDC Address Register and UDC RAM unaffected. 2 3 Flash Address input 4 5 FL Accesses Flash RAM. Address inputs A0–A2 select digit address while data bit D0 sets (D0=1) or resets (D0=0) Flash bit, A3 and A4 ignored. A0 A0–A2 select specific digits. See Table „Memory Selection“ (page 9). A1 Same as A0 A2 Same as A0 6 Address input A3 A3 and A4 access parts of memory together with Flash pin. See Table 1. 7–9 No pins — No connections 10 Address input A4 Same as A3 11 Clock Select CLS Selects internal or external clock source. CLS=1 selects internal clock (master), CLS=0 selects external clock (slave operation). 12 Clock In/Out CLK Inputs or outputs clock as determined by CLS. 13 Write WR Writes data into display when WR=0. Note CE=0 to enable write cycle. 14 Chip Enable CE Enables display’s write and read cycles when CE=0. 15 Positive supply VCC Positive power supply input. 2006-03-30 Cascading Displays The PDSP188X is designed to drive up to 16 other PDSP188Xs with input loading of 15 pF each. General requirements for cascading 16 displays together: • Determine the correct address for each display. • Use CE from an address decoder to select the correct display. • Use CE from an address decoder to select the correct display. • Select one of the Displays to provide the Clock for the other displays. Connect CLKSEL to VCC for this display. • Tie CLKSEL to ground on other displays. • Use RST to synchronize the blinking between the displays. 7 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Cascading Diagram RD WR FL RST VCC RD WR FL RST CLK CLK I/O SEL Display D0-D7 A0-A4 RD WR FL RST CLK CLK I/O SEL Display Up to 14 more displays in between CE D0-D7 A0-A4 CE Data I/O Address A6 A7 A8 A9 0 Address Decode Chip 1 to 14 Address Decoder 15 IDCD5031 Block Diagram OSC 32 Counter 7 Counter 3 Counter Row Drivers Character RAM Decode Column Drivers 8 Digit Display 128 Counter Character RAM ROM Word Decode 64 ROM 5 25 Slave D Latch Holding Register Master Column Latch 25 Cursor Controls and Display MUX 5 Character Decode for Display Data Bus 4 UDC Address Register 4 Character Decode 16 16 UDC RAM Self Test Control Word Register Flash RAM (Read/Write) IDBD5064 2006-03-30 8 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Functional Description The display's user interface is organized into five memory areas. They are accessed using the Flash Input, FL , and address lines, A3 and A4. All the listed RAMs and Registers may be read or written through the data bus. See Table „Memory Selection“ (page 9). Each input pin is described in Pin Definitions. Theory of Operation The PDSP188X Display is designed to work with all major microprocessors. Data entry is via an eight bit parallel bus. Three bits of address route the data to the proper digit location in the RAM. Standard control signals like WR and CE allow the data to be written into the display. D0–D7 data bits are used for both Character RAM and control word data input. A3 acts as the mode selector. If A3=1, character RAM is selected. Then input data bit D7 will determine whether input data bits D0–D6 is ASCII coded data (D7=0) or UDC data (D7=1). See section on „UDC Address Register and UDC RAM“ (page 10). For normal operation FL pin should be held high. When FL is held low, Flash RAM is accessed to set character blinking. Five Basic Memory Areas Character RAM Stores either ASCII (Katakana) character data or an UDC RAM address Flash RAM 1 x 8 RAM which stores Flash data User-Defined Character RAM (UDC RAM) Stores dot pattern for custom characters User-Defined Address Register (UDC Address Register) Provides address to UDC RAM when user is writing or reading custom character Control Word Register Enables adjustment of display brightness, flash individual characters, blink, self test or clearing the display The seven bit ASCII code is decoded by the Character ROM to generate Column data. Twenty columns worth of data is sent out each display cycle, and it takes fourteen display cycles to write into eight digits. The rows are multiplexed in two sets of seven rows each. The internal timing and control logic synchronizes the turning on of rows and presentation of column data to assure proper display operation. Power Up Sequence Upon power up the display will come on at random. Thus the display should be reset on power-up. Reset will clear the Flash RAM, Control Word Register and reset the internal counter. All the digits will show blanks and display brightness level will be 100%. The display must not be accessed until three clock pulses (110 µs minimum using the internal clock) after the rising edge of the reset line. RST can be used to initialize display operation upon power up or during normal operation. When activated, RST will clear the Flash RAM and Control Word Register (00H) and reset the internal counter. All eight display memory locations will be set to 20H to show blanks in all digits. FL pin enables access to the Flash RAM. The Flash RAM will set (D0=1) or reset (D0=0) flashing of the character addressed by A0– A2. The 1 x 8 bit Control Word Register is loaded with attribute data if A3=0. Microprocessor Interface The interface to a microprocessor is through the 8-bit data bus (D0–D7), the 4-bit address bus (A0–A3) and control lines FL , CE and WR. To write data (ASCII/Control Word) into the display CE should be held low, address and data signals stable and WR should be brought low. The data is written on the low to high transition of WR. The Control Word is decoded by the Control Word Decode Logic. Each code has a different function. The code for display brightness changes the duty cycle for the column drivers. The peak LED current stays the same but the average LED current diminishes depending on the intensity level. The character Flash Enable causes 2.0 Hz coming out of the counter to be ANDED with the column drive signal to make the column driver cycle at 2.0 Hz. Thus the character flashes at 2.0 Hz. The Control Word Logic decodes attribute data for proper implementation. Character ROM is designed for 128 ASCII characters. The ROM is Mask Programmable for custom fonts. The Clock Source could either be the internal oscillator (CLKSEL=1) of the device or an external clock (CLKSEL=0) could be an input from another HDSP211X display for synchronizing blinking for multiple displays. The Display Multiplexer controls the Row Drivers so no additional logic is required for a display system. The Display has eight digits. Each digit has 35 LEDs. Memory Selection FL A4 A3 Section of Memory A2–A0 Data Bits Used 0 X X Flash RAM Character Address D0 1 0 0 UDC Address Register Don’t Care D3–D0 1 0 1 UDC RAM Row Address D4–D0 1 1 1 Character RAM Character Address D7–D0 1 1 0 Control Word Register Don’t Care D7–D0 2006-03-30 9 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 The display Blink works the same way as the Flash Enable but causes all twenty column drivers to cycle at 2.0 Hz thereby making all eight digits blink at 2.0 Hz. The Self Test function of the IC consists of two internal routines which exercise major portions of the IC and illuminates all the LEDs. Clear bit clears the character RAM and writes a blank into the display memory. It however does not clear the control word. ASCII Data or Control Word Data can be written into the display at this point. For multiple display operation, CLK I/O must be properly selected. CLK I/O will output the internal clock if CLKSEL=1, or will allow input from an external clock if CLKSEL=0. UDC Address Register and UDC RAM The UDC Address Register and UDC RAM allows the user to generate and store up to 16 custom characters. Each custom character is defined in 5 x 7 dot matrix pattern. It takes 8 write cycles to define a custom character, one cycle to load the UDC Address Register and 7 cycles to define the character. The contents of the UDC Address Register will store the 4 bit address for one of the 16 UDC RAM locations. The UDC RAM is used to store the custom character. UDC Address Register The UDC Address Register is selected by setting FL=1, A4=0, A3=0. It is a 4 bit register and uses data bits, D3–D0 to store the 4 bit address code (D7–D4 are ignored). The address code selects one of 16 UDC RAM locations for custom character generation. Character RAM The Character RAM is selected when FL , A4 and A3 are set to 1,1,1 during a read or write cycle. The Character RAM is a 8 by 8 bit RAM with each of the eight locations corresponding to a digit on the display. Digit 0 is on the left side of the display and digit 7 is on the right side of the display. Address lines, A2–A0 select the digit address with A2 being the most significant bit and A0 being the least significant bit. The two types of data stored in the Character RAM are the ASCII coded data and the UDC Address Data. The type of data stored in the Character RAM is determined by data bit, D7. If D7 is low, then ASCII coded data is stored in data bits D6– D0. If D7 is high, then UDC Address Data is stored in data bit D3– D0. The ASCII coded data is a 7 bit code used to select one of 128 ASCII characters permanently stored in the ASCII ROM. UDC RAM The UDC RAM is selected by setting FL=1, A4=0, A3=1. The RAM is comprised of a 7 x 5 bit RAM. As shown in Table „UDC Character Map“ (page 11), address lines, A2-A0 select one of the 7 rows of the custom character. Data bits, D4-D0 determine the 5 bits of column data in each row. Each data bit corresponds to a LED. If the data bit is high, then the LED is on. If the data bit is low, the LED is off. To create a character, each of the 7 rows of column data need to be defined. See Table „UDC Address Register and UDC RAM“ (page 10) for logic. The UDC Address data is a 4 bit code used to select one of the UDC characters in the UDC RAM. There are up to 16 characters available. See Table „Character RAM Access Logic“ (page 10). Character RAM Access Logic RST CE WR RD FL A4 A3 A2 1 0 0 1 1 1 1 Character Address for Digits 0–7 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 0 7 bit ASCII code for a Write Cycle 1 0 1 0 1 1 1 Character Address for Digits 0–7 0 7 bit ASCII code read during a Read Cycle 1 0 0 1 1 0 0 Character Address for Digits 0–7 1 D3–D0=UDC address for a Write Cycle 1 0 1 0 1 0 0 Character Address for Digits 0–7 1 D3–D0=UDC address for Read Data D7 D6 D5 D4 D3 D2 D1 D0 UDC Address Register and UDC Character RAM RST CE WR RD FL A4 A3 A2 1 0 0 1 1 0 0 Not used for UDC Address Register D3–D0=UDC RAM Address Code for Write Cycle 1 0 1 0 1 0 0 Not used for UDC Address Register D3–D0=UDC RAM Address Code for Read Cycle 1 0 0 1 1 0 1 A2–A0=Character Row Address D4–D0=Character Column Data for Write Cycle 1 0 1 0 1 0 1 A2–A0=Character Row Address D4–D0=Character Column Data read during a Read Cycle 2006-03-30 10 A1 A0 UDC Address Register UDC RAM PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Flash RAM The Flash RAM allows the display to flash one or more of the characters being displayed. The Flash Ram is accessed by setting FL low. A4 and A3 are ignored. The Flash RAM is a 8 x 1 bit RAM with each bit corresponding to a digit address. Digit 0 is on the left side of the display and digit 7 is on the right side of the display. Address lines, A2–A0 select the digit address with A2 being the most significant digit and A0 being the least significant digit. Data bit, D0, sets and resets the flash bit for each digit. When D0 is high, the flash bit is set; and when D0 is low, it is reset. See Table „Flash RAM Access Logic“ (page 11). Blink Function Control Word bit, D4, enables or disables the Blink Function. When D4 is 1, the Blink Function is enabled and all characters on the display will blink at approximately 2.0 Hz. The Blink Function will override the Flash Function if both functions are enabled. When D4 is 0, the Blink Function is disabled. When using an external clock, the blink rate can be determined by dividing the clock rate by 28,672. For synchronized blinking on multiple displays, see the Reset Section (page 12). UDC Character Map Control Word The Control Word is used to set up the attributes required by the user. It is addressed by setting FL=1, A4=1, A3=0. The Control Word is an 8 bit register and is accessed using data bits, D7–D0. See Table „Control Word Access Logic“ (page 11) and Figure „Control Word Data Definition“ (page 12) for the logic and attributed control. The Control Word has 5 functions. They are brightness control, flashing character enable, blinking character enable, self test, and clear (Flash and Character RAMS only). Row Data Brightness Control Control Word bits, D2–D0, control the brightness of the display with a binary code of 000 being 100% brightness and 111 being display blank. See Figure „Control Word Data Definition“ (page 12) for brightness level versus binary code. The average ICC can be calculated by multiplying the 100% brightness level ICC value by the display’s brightness level. For example, a display set to 80% brightness with a 100% average ICC value of 200 mA will have an average ICC value of 200 mA x 80%=160 mA. Column Data A2 A1 A0 Row # 0 0 0 1 0 0 1 2 0 1 0 3 0 1 1 4 1 0 0 5 1 0 1 6 1 1 0 7 C1 C2 C3 C4 C5 D4 D3 D2 D1 D0 5x7 Dot Matrix Pattern Self Test Control Word bits, D6 and D5, are used for the Self Test Function. When D6 is 1, the Self Test is initiated. Results of the Self Test are stored in bit D5. Control Word bit, D5, is a read only bit. When D5 is 1, Self Test has passed. When D5 is 0, Self Test failed is indicated. The Self Test function of the IC consists of two internal routines which exercise major portions of the IC and illuminates all of the LEDs. The first routine cycles the ASCII decoder ROM through all states and performs a check sum on the out-put. If the check sum is correct, D5 is set to a 1 (Pass). Flash Function Control Word bit, D3, enables or disables the Flash Function. When D3 is 1, the Flash Function is enabled and any digit with its corresponding bit set in the Flash RAM will flash at approximately 2.0 Hz. When using an external clock, the flash rate can be determined by dividing the clock rate by 28,672. When D3 is 0, the Flash Function is disabled and the contents of the Flash RAM is ignored. For synchronized flashing on multiple displays, see the Reset Section (page 12). Flash RAM Access Logic RST CE WR RD FL A4 A3 A2 1 0 0 1 0 X X Flash RAM Address for Digits 0–7 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 D0=Flash Data, 0=Flash Off and 1=Flash On (Write Cycle) 1 0 1 0 0 X X Flash RAM Address for Digits 0–7 D0=Flash Data, 0=Flash Off and 1=Flash On (Read Cycle) D7 D6 D5 D4 D3 D2 D1 D0 Control Word Access Logic RST CE WR RD FL A4 A3 A2 1 0 0 1 1 1 0 Not used for Control Word Control Word data for a Write Cycle, see Figure „Control Word Data Definition“ (page 12) 1 0 1 0 1 1 0 Not used for Control Word Control Word data for a Read during a Read Cycle 2006-03-30 11 A1 A0 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 The second routine provides a visual test of the LEDs. This is accomplished by writing checkered and inversed checkered patterns to the display. Each pattern is displayed for approximately 2.0 sec. During the self test function the display must not be accessed. The time needed to execute the self test function is calculated by multiplying the clock time by 262,144 (typical time ≈ 4.6 s). At the end of the self test, the Character RAM is loaded with blanks; the Control Word Register is set to zeroes except D5; the Flash RAM is cleared and the UDC Address Register is set to all 1.0 sec. Reset Function The display should be reset on power up of the display (RST=LOW). When the display is reset, the Character RAM, Flash RAM, and Control Word Register are cleared. The display's internal counters are reset. Reset cycle takes three clock cycles (110 µs minimum using the internal clock). The display must not be accessed during this time. To synchronize the flashing and blinking of multiple displays, it is necessary for the display to use a common clock source and reset all the displays at the same time to start the internal counters at the same place. While RST is low, the display must not be accessed by RD nor WR. Clear Function (see Figure „Control Word Data Definition“ (page 12) and Table „Clear Function“ (page 12)) Control Word bit, D7 clears the character RAM to 20 hex and the flash RAM to all zeroes. The RAMs are cleared within three clock cycles (110 µs minimum, using the internal clock) when D7 is set to 1. During the clear time the display must not be accessed. When the clear function is finished, bit 7 of the Control Word RAM will be reset to a “0”. Control Word Data Definition D7 D6 Clear Function D5 Self Test D4 D3 Blink Function Flash Function D2 D1 Key D0 Brightness Control D2 0 0 0 0 1 1 1 1 D1 0 0 1 1 0 0 1 1 D0 0 1 0 1 0 0 0 1 Brightness Control 100% Brightness 80% Brightness 53% Brightness 40% Brightness 27% Brightness 20% Brightness 13% Brightness Blank Display C Clear Function ST Self test BL Blink function FL Flash function Br Brightness control D3 Flash Function 0 Disabled 1 Enabled D4 Blink Function 0 Disabled 1 Enabled (overrides Flash Function) D6 D5 Self Test 0 X Normal Operation (X = bit ignored) 1 R Run Self Test, R = Test Result (1 = pass, 0 = fail) D7 Clear Function 0 Normal Operation 1 Clear Flash RAM & Character RAM (Character RAM = 20 Hex) IDCW5161 Clear Function CE WR FL A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 Operation 0 0 0 0 1 1 0 0 X X X X X X 0 1 X X X X X X X X X X X X X X Clear disabled Clear user RAM, flash RAM and display X=don’t care 2006-03-30 12 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Display Cycle Using Built-in ROM Example Display message “Showtime.” Digit 0 is leftmost—closest to pin 1. Logic levels: 0=Low, 1=High, X=Don’t care. RST CE WR RD FL A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 Operation Display 0 X 1 1 1 X X X X X X X X X X X X X Reset. No Read/Write Within 3 Clock Cycles All Blank 1 0 0 1 1 1 0 X X X 0 0 X 0 0 0 1 1 53% Brightness Selected All Blank 1 0 0 1 1 1 1 0 0 0 0 1 0 1 0 0 1 1 Write “S” to Digit 0 S 1 0 0 1 1 1 1 0 0 1 0 1 0 0 1 0 0 0 Write “H” to Digit 1 SH 1 0 0 1 1 1 1 0 1 0 0 1 0 0 1 1 1 1 Write “O” to Digit 2 SHO 1 0 0 1 1 1 1 0 1 1 0 1 0 1 0 1 1 1 Write “W” to Digit 3 SHOW 1 0 0 1 1 1 1 1 0 0 0 1 0 1 0 1 0 0 Write “T” to Digit 4 SHOWT 1 0 0 1 1 1 1 1 0 1 0 1 0 0 1 0 0 1 Write “I” to Digit 5 SHOWTI 1 0 0 1 1 1 1 1 1 0 0 1 0 0 1 1 0 1 Write “M” to Digit 6 SHOWTIM 1 0 0 1 1 1 1 1 1 1 0 1 0 0 0 1 0 1 Write “E” to Digit 7 SHOWTIME Displaying User Defined Character Example Load character “A” into UDC-5 and then display it in digit 2. Logic levels: 0=Low, 1=High, X=Don‘t care RST CE WR RD FL A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 Operation Display 0 X 1 1 1 X X X X X X X X X X X X X Reset. No Read/Write Within 3 Clock Cycles All Blank 1 0 0 1 1 0 0 X X X X X X X 0 1 0 1 Select UDC-5 All Blank 1 0 0 1 1 0 1 0 0 0 X X X 0 1 1 1 0 Write into Row 1 of UDC-5 All Blank 1 0 0 1 1 0 1 0 0 1 X X X 1 0 0 0 1 Write into Row 2 of UDC-5 All Blank 1 0 0 1 1 0 1 0 1 0 X X X 1 0 0 0 1 Write into Row 3 of UDC-5 All Blank 1 0 0 1 1 0 1 0 1 1 X X X 1 1 1 1 1 Write into Row 4 of UDC-5 All Blank 1 0 0 1 1 0 1 1 0 0 X X X 1 0 0 0 1 Write into Row 5 of UDC-5 All Blank 1 0 0 1 1 0 1 1 0 1 X X X 1 0 0 0 1 Write into Row 6 of UDC-5 All Blank 1 0 0 1 1 0 1 1 1 0 X X X 1 0 0 0 1 Write into Row 7 of UDC-5 All Blank 1 0 0 1 1 1 1 0 1 0 1 X X X 0 1 0 1 Write UDC-5 into Digit 2 (Digit 2) A 2006-03-30 13 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Electrical and Mechanical Considerations Voltage Transient Suppression For best results power the display and the components that interface with the display to avoid logic inputs higher than VCC. Additionally, the LEDs may cause transients in the power supply line while they change display states. The common practice is to place a parallel combination of a 0.01 µF and a 22 µF capacitor between VCC and GND for all display packages. Optical Considerations The 4.70 mm (0.180") high character of the PDSP188X gives readability up to eight 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 PDSP1880 / PDSP1882 are red / high efficiency red displays and should be matched with a long wavelength pass filter in the 570 nm to 590 nm range. The PDSP1883 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. ESD Protection The input protection structure of the PDSP188X provides significant protection against ESD damage. It is capable of withstanding discharges greater than 4.0 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 PDSP188X can be hand soldered with SN63 solder using a grounded iron set to 260 °C. Wave soldering is also possible. Use water soluble organic acid flux or resin based RMA flux. A wave temperature of 245 °C ± 5 °C with a dwell between 1.5 sec to 3.0 sec can be used. Exposure to the wave should not exceed temperatures above 260 °C for five seconds at 1.59 mm (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 (60 °C) 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 polycarbonate package. Maximum exposure should not exceed two minutes at elevated temperatures. Acceptable solvents are TF (trichorotrifluorethane), and IPA. Some major solvent manufacturers are: Allied Chemical Corporation, Specialty Chemical Division, Morristown, NJ; Baron-Blakeslee, Chicago, IL; Dow Chemical, Midland, MI; E.I. DuPont de Nemours & Co., Wilmington, DE. For further information refer to Appnote 19 at www.osram-os.com An alternative to soldering and cleaning the display modules is to use sockets. Naturally, 28 pin DIP sockets 7.62 mm (0.300") wide with 2.54 mm (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 are Aries Electronics, Inc., Frenchtown, NJ; Garry Manufacturing, New Brunswick, NJ; Robinson-Nugent, New Albany, IN; and Samtec Electronic Hardward, New Albany, IN. 2006-03-30 14 PDSP1880, PDSP1881, PDSP1882, PDSP1883, PDSP1884 Revision History: 2006-03-30 Previous Version: 2004-12-09 Page Subjects (major changes since last revision) Date of change all Lead free device 2006-01-23 Published by OSRAM Opto Semiconductors GmbH Wernerwerkstrasse 2, D-93049 Regensburg www.osram-os.com © All Rights Reserved. Attention please! The information describes the type of component and shall not be considered as assured characteristics. Terms of delivery and rights to change design reserved. Due to technical requirements components may contain dangerous substances. For information on the types in question please contact our Sales Organization. If printed or downloaded, please find the latest version in the Internet. Packing Please use the recycling operators known to you. We can also help you – get in touch with your nearest sales office. By agreement we will take packing material back, if it is sorted. You must bear the costs of transport. For packing material that is returned to us unsorted or which we are not obliged to accept, we shall have to invoice you for any costs incurred. Components used in life-support devices or systems must be expressly authorized for such purpose! Critical components1) may only be used in life-support devices or systems2) with the express written approval of OSRAM OS. 1) 2) A critical component is a component used in a life-support device or system whose failure can reasonably be expected to cause the failure of that life-support device or system, or to affect its safety or the effectiveness of that device or system. Life support devices or systems are intended (a) to be implanted in the human body, or (b) to support and/or maintain and sustain human life. If they fail, it is reasonable to assume that the health and the life of the user may be endangered. 2006-03-30 15