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DSD-40BCD Series
Miniature 41/2 Digit, BCD Input, Slave LED Display
FEATURES
Low cost! Complete! No external components required Rugged, epoxy-encapsulated package Ideal for computer-based instruments Miniature size: 2.17" x 0.92" x 0.56" 55mm x 23mm x 14mm Built-in color filter and bezel Single +5V supply, TTL compatible Low-power model, 35mA (175mW) Large (0.52"/13.2mm), matched-intensity, LED display Choice of red or green LED's Minus sign and decimal points included PC-board or panel mountable SIMPLIFIED SCHEMATIC
1 +5V SUPPLY DIGIT A DRIVE 5 L B4 12 N.C.
PRODUCT OVERVIEW
DATEL's new DSD-40BCD digital slave display combines a full-size, 41/2 digit, LED display with all the other necessary components (including a built-in, contrast-enhancing filter/bezel) to implement a pc-board mountable instrument display. The epoxy-encapsulated, 24-pin package, measuring only 2.17 x 0.92 x 0.56 inches, is perfectly sized to occupy the absolute minimum pc-board space. The one-piece LED display eliminates the need to purchase multiple, matched-intensity LED's--usually an expensive and limited-availability situation. The DSD-40BCD's flexible design gives the user full control of all major display functions including display update rate, number of digits enabled, and decimal point selection. Its TTL-compatible inputs interface directly with most BCD output, integrating analog-to-digital converters--no additional glue logic is required! When used with sophisticated microcomputers, the brightness of any digit can be independently controlled by simply lowering the digit-drive input duty cycle. 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 all digits turned on, draws only 35mA from its +5V supply. This ultra-low power consumption means that even battery-powered applications can now benefit from the superior readability offered by LED displays.
2 DISPLAY TEST
DIGIT B DRIVE 1 DIGIT C DRIVE 2 +5V
K B2
11 N.C.
3 5V RETURN
J B1
10 5V RETURN
4 DP 3
DIGIT D DRIVE 3 POL
DIG 1
DIG 2
DIG 3
DIG 4
DIG 5
I B8
9 N.C.
5 DP 2
DIGIT E DRIVE 4
H N.C. DP
DP1 DP2 DP3 DP4
8 DP 4
6 DP 1 Segment Identification
A F E D G B C
F POLARITY
A
B
C
D
E
F
G
G N.C.
7 N.C.
DIGIT DRIVE 1
DIGIT DRIVE 4 SEVEN-SEGMENT DRIVERS BCD DECODER
DISPLAY TEST DP 1 DP 4
Figure 1. Simplified Schematic
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MPM_DSD-40BCD.B01 Page 1 of 5
DSD-40BCD Series
Miniature 41/2 Digit, BCD Input, Slave LED Display
Ordering Information
Display Display Type and Size Min. Typ. Max. Units
DSD-40BCD - RS-C
LED Color: GS = Standard Green RL = Low-Power Red RS = Standard Red Accessories: DMS-30-CP DMS-BZL1-C DMS-BZL2-C
41/2 Digit LED, 0.52"/13.2mm high
LED Peak Wavelength (): DSD-40BCD-GS DSD-40BCD-RL DSD-40BCD-RS Physical/Environmental - - - 565 630 635 - - - nm nm nm
Panel cutout punch DSD-40 bezel assembly DSD-40 bezel assembly with sealing gasket
Operating Temperature Storage Temperature Humidity (Non-condensing) Case Material Weight BCD Inputs and Resultant Displays
0 -40 0
- - -
+70 +75 85
C C %
A panel-mount retaining clip is supplied with each model.
Polycarbonate 1 ounce (28 grams)
Functional Specifications
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 BCD (pins I-L) and TEST (pin 2) Inputs:
Min.
Typ.
Max.
Units
TECHNICAL NOTES
- - +2.4 - - - - - +0.8 0.4 - 0.05 Volts mA Volts mA
Low-Level Input Voltage (VIL) Low-Level Input Current (IIL) High-Level Input Voltage (VIH) High-Level Input Current (IIH)
Polarity Input (pin F):
Low-Level Input Voltage (VIL) Low-Level Input Current (IIL) High-Level Input Voltage (VIH) High-Level Input Current (IIH)
Digit Drive Inputs (pins A-E):
- - +4.5 -
- - - -
+0.8 0.4 - 0.05
Volts mA Volts mA
1. DSD-40BCD Operation (Please Refer to the Timing and Pinout Diagrams for the Following Discussion): The DSD-40BCD display has five digits, labeled digit 1 (left-most digit or MSD) through digit 5 (rightmost digit or LSD), which are turned on by bringing their respective DIGIT DRIVE inputs to a high logic level. The binary coded decimal data (BCD) on pins I- L is decoded into the corresponding seven-segment LED outputs necessary to display the numerals "0" through "9". Since there are effectively five digits and only one set of BCD data inputs, the DSD-40BCD's digits have their segments tied ("multiplexed") together. The top segment, referred to as segment A, of digit 5 is connected to the A segment of the other three digits (digit 1 has no A segment). The remaining B, C, D, E, F and G segments are connected to each other in the same fashion. As an example of how the multiplexing scheme works, assume that 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 conditions, the B and C segments of digits 1-5 will all be enabled. However, only the digits whose DIGIT DRIVE inputs are high, in this case only digit 3, will display the numeral "1". All the other digits will be off. This example, while technically valid, will produce an extremely bright "1" for digit 3. This will be explained in greater detail in the section titled "Controlling the Display Brightness." 2. DSD-40BCD Timing Diagram (See Figure 2): The timing diagram depicts the required typical input conditions and timing relationships that allow the user to access all 5 digits. The recommended display scan rate is 100Hz. All 5 digits are scanned in 10ms, and each individual digit is "on" for 2ms (20% duty cycle). The 100Hz figure is not critical; it can go as low as 70Hz without any impact on display visibility. The timing diagram shows the digits being scanned from left to right (DIGIT 1 to DIGIT 5), but this order is not mandatory. Any drive
Low-Level Input Voltage (VIL) Low-Level Input Current (IIL) High-Level Input Voltage (VIH) High-Level Input Current (IIH)
DP1-DP4 Inputs (pins 4-6, 8):
- - +4.5 -
- - - -
+0.8 0.4 - 2
Volts mA Volts mA
Low-Level Input Voltage (VIL) Low-Level Input Current (IIL) High-Level Input Voltage (VIH) High-Level Input Current (IIH)
Power Supply Requirements Supply Voltage Supply Current: DSD-40BCD-GS DSD-40BCD-RL DSD-40BCD-RS
- - +4.5 -
- - - -
+0.8 20 - 0.05
Volts mA Volts mA
+4.75
+5.00
+5.25
Volts
- - -
+100 +35 +85
+130 +45 +110
mA mA mA
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MPM_DSD-40BCD.B01 Page 2 of 5
DSD-40BCD Series
Miniature 41/2 Digit, BCD Input, Slave LED Display
sequence can be used, as long as BCD data is presented at the correct corresponding DIGIT DRIVE interval. An important point to keep in mind is that the DSD-40BCD has no internal data latches! The DIGIT DRIVE and BCD data inputs must be continuously strobed to keep the display properly illuminated. 3. Decimal Point Inputs (DP1-DP4, Pins 4-6, 8): The four, active-low, decimal point segments are multiplexed in a similar, though not identical, manner as the rest of the digit segments. The four decimal points are controlled by their respective DIGIT DRIVE inputs. A selected decimal point may be permanently connected to ground. It will only be illuminated when its respective DIGIT DRIVE input is high. For example, if pin 6 (DP1) is hard-wired to pin 3 (5V RETURN), DP1 will only be on during the time interval that DIGIT DRIVE 1 is high. As the specifications table clearly states, DP1-DP4 each require 20mA of sink current in order to achieve good illumination levels. Unused decimal points may be left open. The specified minimum VIH applies only if logic-level devices are used to select the decimal points. 4. POLARITY (Pin F): The function of this active-low pin is to turn on the minus sign if negative readings are desired. The polarity input, like the decimal points, can also be permanently connected to ground. However, POLARITY is logic-level compatible and does not require the high sink currents that DP1-DP4 do. If negative readings are never displayed, the POLARITY input may be left open. 5. Controlling Display Brightness: The LED current-setting components inside the DSD-40BCD are selected to produce good display brightness -- while keeping power dissipation at reasonable levels -- with a 20% duty cycle. Since no data latches are utilized in the DSD-40BCD design, the user can exercise full control over how many digits are enabled, and their relative brightness, by manipulating the duty cycle of the DIGIT DRIVE input. To turn off one digit, for a four digit application, simply leave the respective DIGIT DRIVE input (DIGIT DRIVE 5 in this example) open or low. If the timing relationships remain unchanged (i.e., 20% duty cycle), the display brightness will remain the same as when all five digits are used. However, if the duty cycle is changed to 25% (because only four digits are used), the increase in display intensity will be noticeable. In most applications, this increase in intensity will not be significant enough to justify any timing changes. 6. Highlighting Selected Digits: In many instrument designs, it is sometimes desirable to highlight or "flash" one particular digit to draw the user's attention to that digit. Once again, duty cycle control of the digit drive inputs makes this a relatively simple task. The easiest way is to flash the digit on and off, at a 0.5 to 1Hz rate, with the DIGIT DRIVE input. Keeping the duty cycle fixed at 20% for 5-digit applications, and 25% for 4-digits, will keep the intensity of the non-flashed digits uniform. 7. Power Supply Decoupling: The DSD-40BCD is not sensitive to logic noise or spikes, on either the 5V supply or the data inputs, because it does not use any edge-triggered logic. However, it does generate a fair amount of switching transients due to the display's multiplexed architecture. A tantalum electrolytic capacitor, in the range of 15 to 22F, in parallel with a 0.1F ceramic capacitor will reduce the LED switching transients. These two capacitors should be located as close as possible to pins 1 and 3. 8. Interfacing BCD-Output A/D Converters: The DSD-40BCD accepts the BCD data from DATEL's DMS-40PC-X-RS-BCD Series, 41/2 Digit Panel Meters. DMS-40PC meters are exactly the same size as the DSD-40BCD display making it ideal for use in remote-display applications. The DSD-40BCD will also interface directly with the ICL7135, 41/2 digit, integrating A/D converter's BCD and DIGIT DRIVE outputs. The only difference is that the ICL7135 has its five DIGIT DRIVE outputs labeled in a right-to-left order, i.e., the 7135's MSD is labeled digit 5 and its LSD is labeled digit 1. This is opposite to the DSD-40BCD labeling its MSD digit 1 and its LSD digit 5. Please refer to the 7135's data sheet for more information. 9. DISPLAY TEST (Pin 2): The DSD-40BCD's display can have all its segments enabled by bringing DISPLAY TEST low. The display will show "-18888" (excluding the decimal points) as long as the digit drive inputs are continuously strobed. 10. Soldering Methods: DSD-40BCD Series displays easily withstand most common manual and wave soldering operations. However, we highly recommend that you evaluate the effects your particular soldering techniques may have on the display's polycarbonate case and overall performance. We also recommend the use of no-clean solders since their residue normally has no detrimental effects on low-speed digital devices. 11. Suggested Mating Connectors: Board mounted: Socket DATEL P/N 4320-01074-0
Panel mounted: DATEL recommends the use of IDC (insulation displacement) connectors when panel mounting the DSD-40BCD. SAMTEC's HCS series of IDC cable strips can be ordered in a variety of lengths and connector terminations. Please contact SAMTEC, Inc. at: USA (Indiana) 812-944-6733 Fax: 812-948-5047 Fax: 01236-727113 Fax: 65-841-1502
Europe (Scotland) 01236-739292 Asia (Singapore) 65-745-5955
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MPM_DSD-40BCD.B01 Page 3 of 5
DSD-40BCD Series
Miniature 41/2 Digit, BCD Input, Slave LED Display
Approx. 8msec Approx. 2msec Approx. 2msec
DIGIT DRIVE 1 (MSD)
DIGIT DRIVE 2
DIGIT DRIVE 3
DIGIT DRIVE 4 DIGIT DRIVE 5 (LSD)
BCD DATA (4 LINES) 1 MSD 2 3 4 5 LSD 1 2 3 4 5
Notes: 1. Maximum allowable digit-to-digit overlap is 5sec. 2. Maximum allowable digit-to-BCD data skew is also 5sec.
Figure 2. BCD Data Timing Diagram
MECHANICAL SPECIFICATIONS
LEAD DIMENSIONS: 0.025 (0.635) x 0.025 (0.635) NOMINAL RECOMMENDED PC BOARD FINISHED HOLE DIAMETER: 0.042 0.003 (1.067 0.076)
(LSD) DIGIT DRIVE 5 (MSD) DIGIT DRIVE 1 DIGIT DRIVE 2 DIGIT DRIVE 3 DIGIT DRIVE 4 POLARITY A B C D E F +5V SUPPLY DISPLAY TEST 5V RETURN DP3 DP2 DP1 1 2 3 4 5 6 A B C D E F FRONT VIEW
L K J I H G
DP1 0.92 (23.37) 0.84 (21.34)
DP2
DP3 2.17 (55.12) 2.09 (53.09)
DP4
0.040 (1.02)
0.040 (1.02) 0.17 (4.32) TYP.
0.10 (2.54) TYP. 0.50 (12.70) 0.040 (1.02)
1.60 (40.64) 1.80 (45.72)
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(R)
(R)
MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC 0.02 (0.51) 3 PL DEC 0.010 (0.254)
DSD-40BCD-XX 12 11 10 9 8 7 N.C. N.C. 5V RETURN N.C. DP4 N.C. L K J I H G B4 B2 B1 (LSB) B8 (MSB) N.C. N.C. 0.56 (14.22) 0.250 (6.35) TYP. 0.10 (2.54) TYP. 0.145 (3.68) TYP.
PIN #1 IDENTIFIER
MPM_DSD-40BCD.B01 Page 4 of 5
DSD-40BCD Series
Miniature 41/2 Digit, BCD Input, Slave LED Display
MECHANICAL SPECIFICATIONS, CONT.
OPTIONAL BEZEL (DMS-BZL1 and DMS-BZL2)
#2-56 INSERT 0.156 (3.96) DEEP 0.187 (4.75)
FRONT VIEW
PANEL
1.270 (32.26)
BEZEL 2.55 (64.77)
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII: 0.032 (0.81) MAX. 0.116 (2.95)
1.07 (27.18)
PANEL CUTOUT
0.878 (22.30) PANEL
2.118 (53.80) 2.35 (59.69) 0.093 (2.362) DIAMETER (4 REQUIRED) ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY 0.096 (2.44)
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
12/02/08
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2008 Murata Power Solutions, Inc.
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