DSD-40BCD Series Miniature 4½ Digit, BCD Input, Slave LED Display

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Herbert McCormick
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www.murata-ps.com S-40 Series TURS Low cost! omplete! No external components required Rugged, epoxy-encapsulated package Ideal for computer-based instruments Miniature size: 2.7" x 0.92" x 0.

1 S-40 Series TURS Low cost! omplete! No external components required Rugged, epoxy-encapsulated package Ideal for computer-based instruments Miniature size: 2.7" x 0.92" x 0.56" 55mm x 23mm x 4mm uilt-in color fi lter and bezel Single +5V supply, TTL compatible Low-power model, 35m (75mW) Large (0.52"/3.2mm), matched-intensity, L display hoice of red or green L's Minus sign and decimal points included P-board or panel mountable PROUT OVRVIW TL's new S-40 digital slave display combines a full-size, 4½ digit, L display with all the other necessary components (including a built-in, contrast-enhancing fi lter/bezel) to implement a pc-board mountable instrument display. The epoxy-encapsulated, 24-pin package, measuring only 2.7 x 0.92 x 0.56 inches, is perfectly sized to occupy the absolute minimum pc-board space. The one-piece L display eliminates the need to purchase multiple, matched-intensity L's usually an expensive and limited-availability situation. The S-40's fl exible 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 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 +70 (at 0 to 95% relative humidity). or power-sensitive designs, the low-power S-40-RL model, with all digits turned on, draws only 35m from its +5V supply. This ultra-low power consumption means that even battery-powered applications can now benefi t from the superior readability offered by L displays. SIMPLII SHMTI +5V SUPPLY RIV 5 L ISPLY TST RIV K 2 3 5V RTURN RIV 2 +5V J (LS) 0 5V RTURN 4 P 3 RIV 3 I I 2 I 3 I 4 I 5 I 8 (MS) 9 5 P 2 RIV 4 POL P P P2 P3 P4 H 8 P 4 6 P POLRITY 7 Segment Identification RIV RIV 4 SVN-SMNT RIVRS OR P P 4 ISPLY TST igure. Simplifi ed Schematic or full details go to 0 Jan 20 MPM_S Page of 5

2 S-40 Series Ordering Information S-40 - RS- ccessories: MS-30-P MS-ZL- MS-ZL2- unctional Specifications T = +25 and supply voltage = +5V, unless otherwise noted. ontrol Inputs Min. Typ. Max. Units (pins I-L) and TST (pin 2) Inputs: Low-Level Input urrent (IIL) 0.4 m High-Level Input Voltage (VIH) +2.4 Volts High-Level Input urrent (IIH) 0.05 m Polarity Input (pin ): Low-Level Input urrent (IIL) 0.4 m High-Level Input urrent (IIH) 0.05 m igit rive Inputs (pins -): Low-Level Input urrent (IIL) 0.4 m High-Level Input urrent (IIH) 2 m P-P4 Inputs (pins 4-6, 8): Low-Level Input urrent (IIL) 20 m High-Level Input urrent (IIH) 0.05 m Power Supply Requirements L olor: S = Standard reen RL = Low-Power Red RS = Standard Red Panel cutout punch S-40 bezel assembly S-40 bezel assembly with sealing gasket panel-mount retaining clip is supplied with each model. Supply Voltage Volts Supply urrent: S-40-S m S-40-RL m S-40-RS m isplay Min. Typ. Max. Units isplay Type and Size 4½ igit L, 0.52"/3.2mm high L Peak Wavelength (λ): S-40-S 565 nm S-40-RL 630 nm S-40-RS 635 nm Physical/nvironmental Operating Temperature Storage Temperature Humidity (Non-condensing) 0 85 % ase Material Polycarbonate Weight ounce (28 grams) Inputs and Resultant isplays THNIL NOTS. S-40 Operation (Please Refer to the Timing and Pinout iagrams for the ollowing iscussion): The S-40 display has fi ve digits, labeled digit (left-most digit or MS) through digit 5 (rightmost digit or LS), which are turned on by bringing their respective RIV inputs to a high logic level. The binary coded decimal data () on pins I- L is decoded into the corresponding seven-segment L outputs necessary to display the numerals "0" through "9". Since there are effectively fi ve digits and only one set of data inputs, the S-40's digits have their segments tied ("multiplexed") together. The top segment, referred to as segment, of digit 5 is connected to the segment of the other three digits (digit has no segment). The remaining,,,, and segments are connected to each other in the same fashion. s an example of how the multiplexing scheme works, assume that the data inputs are 000 (the code for the decimal number ) and also assume that the RIV 3 input is high. Under these conditions, the and segments of digits -5 will all be enabled. However, only the digits whose RIV inputs are high, in this case only digit 3, will display the numeral "". ll the other digits will be off. This example, while technically valid, will produce an extremely bright "" for digit 3. This will be explained in greater detail in the section titled "ontrolling the isplay rightness." 2. S-40 Timing iagram (See igure 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 00Hz. ll 5 digits are scanned in 0ms, and each individual digit is "on" for 2ms (20% duty cycle). The 00Hz fi gure 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 ( to 5), but this order is not mandatory. ny drive 0 Jan 20 MPM_S Page 2 of 5

3 S-40 Series sequence can be used, as long as data is presented at the correct corresponding RIV interval. n important point to keep in mind is that the S-40 has no internal data latches! The RIV and data inputs must be continuously strobed to keep the display properly illuminated. 3. ecimal Point Inputs (P-P4, 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 RIV inputs. selected decimal point may be permanently connected to ground. It will only be illuminated when its respective RIV input is high. or example, if pin 6 (P) is hard-wired to pin 3 (5V RTURN), P will only be on during the time interval that RIV is high. s the specifi cations table clearly states, P-P4 each require 20m of sink current in order to achieve good illumination levels. Unused decimal points may be left open. The specifi ed minimum VIH applies only if logic-level devices are used to select the decimal points. 4. POLRITY (Pin ): 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, POLRITY is logic-level compatible and does not require the high sink currents that P-P4 do. If negative readings are never displayed, the POLRITY input may be left open. 5. ontrolling isplay rightness: The L current-setting components inside the S-40 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 S-40 design, the user can exercise full control over how many digits are enabled, and their relative brightness, by manipulating the duty cycle of the RIV input. To turn off one digit, for a four digit application, simply leave the respective RIV input ( RIV 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 fi ve 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 signifi cant enough to justify any timing changes. 6. Highlighting Selected igits: In many instrument designs, it is sometimes desirable to highlight or "fl ash" 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 fl ash the digit on and off, at a 0.5 to Hz rate, with the RIV input. Keeping the duty cycle fi xed at 20% for 5-digit applications, and 25% for 4-digits, will keep the intensity of the non-fl ashed digits uniform. 7. Power Supply ecoupling: The S-40 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. tantalum electrolytic capacitor, in the range of 5 to 22μ, in parallel with a 0.μ ceramic capacitor will reduce the L switching transients. These two capacitors should be located as close as possible to pins and Interfacing -Output / onverters: The S-40 accepts the data from TL's MS-40P-X-RS- Series, 4½ igit Panel Meters. MS-40P meters are exactly the same size as the S-40 display making it ideal for use in remote-display applications. The S-40 will also interface directly with the IL735, 4½ digit, integrating / converter's and RIV outputs. The only difference is that the IL735 has its fi ve RIV outputs labeled in a right-to-left order, i.e., the 735's MS is labeled digit 5 and its LS is labeled digit. This is opposite to the S-40 labeling its MS digit and its LS digit 5. Please refer to the 735's data sheet for more information. 9. ISPLY TST (Pin 2): The S-40's display can have all its segments enabled by bringing ISPLY TST low. The display will show " 8888" (excluding the decimal points) as long as the digit drive inputs are continuously strobed. 0. Soldering Methods: S-40 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.. Suggested Mating onnectors: oard mounted: Socket TL P/N Panel mounted: TL recommends the use of I (insulation displacement) connectors when panel mounting the S-40. SMT's HS series of I cable strips can be ordered in a variety of lengths and connector terminations. Please contact SMT, Inc. at: US (Indiana) ax: urope (Scotland) ax: sia (Singapore) ax: Jan 20 MPM_S Page 3 of 5

4 S-40 Series pprox. 8msec RIV (MS) pprox. 2msec pprox. 2msec RIV 2 RIV 3 RIV 4 RIV 5 (LS) T (8, 4, 2, ) Notes:. Maximum allowable digit-to-digit overlap is 5 sec. 2. Maximum allowable digit-to- data skew is also 5 sec. MS igure 2. ata Timing iagram LS MHNIL SPIITIONS MHNIL IMNSIONS: Inches (mm) TOLRNS: 2 PL ±0.02 (±0.5) 3 PL ±0.00 (±0.254) L IMNSIONS: (0.635) x (0.635) NOMINL PIN # INTIIR S-40-XX ROMMN P OR INISH HOL IMTR: ±0.003 (.067 ±0.076) RONT VIW (LS) RIV 5 (MS) RIV RIV 2 RIV 3 RIV 4 POLRITY +5V SUPPLY ISPLY TST 5V RTURN P3 P2 P L K J I H 2 0 5V RTURN 9 8 P4 7 L 4 K 2 J (LS) I 8 (MS) H 0.92 (23.37) P P2 P3 P4 2.7 (55.2) 0.84 (2.34) 2.09 (53.09) (.02) 0.56 (4.22) (6.35) TYP. (.02) 0.7 (4.32) TYP (2.70) 0.0 (2.54) TYP. (.02).60 (40.64).80 (45.72) 0.0 (2.54) TYP (3.68) TYP. 0 Jan 20 MPM_S Page 4 of 5

5 S-40 Series MHNIL SPIITIONS, ONT. OPTIONL ZL (MS-ZL and MS-ZL2) RONT VIW #2-56 INSRT 0.56 (3.96) P 0.87 (4.75) PNL.270 (32.26) ZL 2.55 (64.77) ROMMN RILL N PNL UTOUT IMNSIONS INTRNL ORNR RII: (0.8) MX. 0.6 (2.95).07 (27.8) PNL UTOUT (22.30) PNL 2.8 (53.80) 2.35 (59.69) (2.362) IMTR (4 RQUIR) ONLY WHN USIN OPTIONL ZL SSMLY (2.44) Murata Power Solutions, Inc. abot oulevard, Mansfi eld, M U.S.. ISO 900 and 400 RISTR 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. Specifi cations are subject to change without notice. 20 Murata Power Solutions, Inc. 0 Jan 20 MPM_S Page 5 of 5

DMS-20PC-4/20 Series. Subminiature 4-20mA Loop-Powered 3½ Digit LED Process Monitors. FEATURES

DMS-20PC-4/20 Series. Subminiature 4-20mA Loop-Powered 3½ Digit LED Process Monitors. FEATURES www.murata-ps.com DMS-20PC-4/20 Series FEATURES Industry's fi rst loop-powered meter with a large, easy-to-read, LED display! Self-powered, no external supply required Unipolar, Bipolar and Positive Reading