DSD-40BCD Series www.murata-ps.com Miniature 4 Digit, BCD Input, Slave LED Display FEATURES Low cost Complete No external components required PRODUCT OVERVIEW Rugged, epoxy-encapsulated package Murata Power Solutions DSD-40BCD digital slave display combines a full-size, 4 digit, LED display Ideal for computer-based instruments with all the other necessary components (including a built-in, contrast-enhancing lter/bezel) to imple- Miniature size: ment a pc-board mountable instrument display. The epoxy-encapsulated, 24-pin package, measuring 2.17 x 0.92 x 0.56 only 2.17 x 0.92 x 0.56 inches, is perfectly sized to occupy the absolute minimum pc-board space. The 55mm x 23mm x 14mm one-piece LED display eliminates the need to purchase multiple, matched-intensity LED susually an Built-in color lter and bezel expensive and limited-availability situation. The DSD-40BCD s exible design gives the user full control of all major display functions including Single +5V supply, TTL compatible display update rate, number of digits enabled, and decimal point selection. Its TTL-compatible inputs inter- Low-power model, 35mA (175mW) face directly with most BCD output, integrating analog-to-digital convertersno additional glue logic is Large (0.52 /13.2mm), matched-intensity, required When used with sophisticated microcomputers, the brightness of any digit can be independently LED display controlled by simply lowering the digit-drive input duty cycle. Choice of red or green LED s The extremely rugged package allows all models to operate over the temperature range of 0 to +70C (at 0 to 95% relative humidity). For power-sensitive designs, the low-power DSD-40BCD-RL model, with Minus sign and decimal points included all digits turned on, draws only 35mA from its +5V supply. This ultra-low power consumption means that PC-board or panel mountable even battery-powered applications can now bene t from the superior readability offered by LED displays. SIMPLIFIED SCHEMATIC L 12 1 A DIGIT B4 N.C. +5V SUPPLY DRIVE 5 2 B K 11 DIGIT DISPLAY TEST B2 N.C. DRIVE 1 +5V J 10 C 3 DIGIT B1 5V RETURN 5V RETURN DRIVE 2 4 DIGIT D I 9 DIG 1 DIG 2 DIG 3 DIG 4 DIG 5 DP 3 B8 N.C. DRIVE 3 POL H 8 5 E DIGIT N.C. DP 4 DP 2 DRIVE 4 DP DP1 DP2 DP3 DP4 6 F AB C D E F G G 7 DP 1 POLARITY N.C. N.C. Segment DIGIT Identification DIGIT DRIVE 1 DRIVE 4 A SEVEN-SEGMENT DRIVERS BCD DECODER F B G E C DISPLAY TEST D DP 1 DP 4 Figure 1. Simpli ed Schematic For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM DSD-40BCD.C01 Page 1 of 5DSD-40BCD Series Miniature 4 Digit, BCD Input, Slave LED Display Display Min. Typ. Max. Units Ordering Information Display T ype and Size 4 Digit LED, 0.52 /13.2mm high DSD-40BCD - RS-C LED Peak Wavelength (): LED Color: GS = Standard Green DSD-40BCD-GS 565 nm RL = Low-Power Red DSD-40BCD-RL 630 nm RS = Standard Red DSD-40BCD-RS 635 nm See www.murata-ps.com/dpm-availability for model-speci c availability. Physical/Environmental Accessories: Opera ting Tempera ture 0 +70 C DMS-30-CP Panel cutout punch Storage Temperature 40 +75 C DMS-BZL1-C DSD-40 bezel assembly Humidity (Non-condensing) 0 85 % DMS-BZL2-C DSD-40 bezel assembly with sealing gasket Case Material Polycarbonate Weight 1 ounce (28 grams) A panel-mount retaining clip is supplied with each model. BCD Inputs and Resultant Displays Functional Speci cations TA = +25C and supply voltage = +5V, unless otherwise noted. 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 Control Inputs Min. Typ. Max. Units TECHNICAL NOTES BCD (pins I-L) and TEST (pin 2) Inputs: Low-Level Input Voltage (VIL) +0.8 Volts 1. DSD-40BCD Operation (Please Refer to the Timing and Pinout Dia- 0.4 mA grams for the Following Discussion): The DSD-40BCD display has ve Low-Level Input Current (IIL) digits, labeled digit 1 (left-most digit or MSD) through digit 5 (right- +2.4 Volts High-Level Input Voltage (VIH) most digit or LSD), which are turned on by bringing their respective 0.05 mA High-Level Input Current (IIH) DIGIT DRIVE inputs to a high logic level. The binary coded decimal data Polarity Input (pin F): (BCD) on pins I- L is decoded into the corresponding seven-segment +0.8 Volts Low-Level Input Voltage (VIL) LED outputs necessary to display the numerals0 through9 . 0.4 mA Low-Level Input Current (IIL) Since there are effectively ve digits and only one set of BCD data in- puts, the DSD-40BCD s digits have their segments tied multiplexe) High-Level Input Voltage (VIH) +4.5 Volts together. The top segment, referred to as segment A, of digit 5 is 0.05 mA High-Level Input Current (IIH) connected to the A segment of the other three digits (digit 1 has no A Digit Drive Inputs (pins A-E): segment). The remaining B, C, D, E, F and G segments are connected +0.8 Volts Low-Level Input Voltage (VIL) to each other in the same fashion. Low-Level Input Current (IIL) 0.4 mA As an example of how the multiplexing scheme works, assume that +4.5 Volts High-Level Input Voltage (VIH) the BCD data inputs are 0001 (the BCD code for the decimal number 1) and also assume that the DIGIT DRIVE 3 input is high. Under these High-Level Input Current (IIH) 2 mA conditions, the B and C segments of digits 1-5 will all be enabled. DP1-DP4 Inputs (pins 4-6, 8): However, only the digits whose DIGIT DRIVE inputs are high, in this Low-Level Input Voltage (VIL) +0.8 Volts case only digit 3, will display the numeral1 . All the other digits will 20 mA Low-Level Input Current (IIL) be off. This example, while technically valid, will produce an extremely bright1 for digit 3. This will be explained in greater detail in the sec- High-Level Input Voltage (VIH) +4.5 Volts tion titledControlling the Display Brightness 0.05 mA High-Level Input Current (IIH) 2. DSD-40BCD Timing Diagram (See Figure 2): The timing diagram de- Power Supply Requirements picts the required typical input conditions and timing relationships that Supply Voltage +4.75 +5.00 +5.25 Volts allow the user to access all 5 digits. The recommended display scan Supply Current: rate is 100Hz. All 5 digits are scanned in 10ms, and each individual DSD-40BCD-GS +100 +130 mA digit iso for 2ms (20% duty cycle). The 100Hz gure is not critical DSD-40BCD-RL +35 +45 mA it can go as low as 70Hz without any impact on display visibility. DSD-40BCD-RS +85 +110 mA The timing diagram shows the digits being scanned from left to right (DIGIT 1 to DIGIT 5), but this order is not mandatory. 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