DMS-20PC MURATA-PS | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 6

Technical content

Ḥ (+) INPUT HI (–) INPUT LO ANALOG COMMON REFERENCE OUT REFERENCE IN +5V SUPPLY DP 1 DP 2 DP 3 DC/DC CONVERTER 5V RETURN +5V –5V »+2.0V DATA 909k A/D CONVERTER0 Vdc 0.01 μF DISPLAY ENABLE +5V R2 is not used on ±200mV (-0) models or ±2V (-1) models. R2 = 100k on ±20V (-2) models and 9.1k on ±200V (-3) models. Only used on ±200mV (-0) and ±2V (-1) models. DISPLAY TEST/HOLD Pin 9 is DISPLAY TEST on all but eight models. On those models (-H option), it is DISPLAY HOLD. For full details go to www.murata-ps.com/rohs www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 DMS-20PC Series 3½ Digit, LED Display, Low-Cost, Subminiature Digital Panel Voltmeters MPM_DMS_20PC.D02 Page 1 of 6 DMS-20PC Series, 3½ Digit, LED Display, Digital Panel Voltmeters combine a preci- sion A/D converter; a factory-trimmed, highly stable, voltage reference; and a large (0.37"/9.4mm), easy-to-read LED display in a single package that is only slightly larger than the display itself. Displays are offered in either red, orange, amber, yellow, green or blue colors. High-intensity and low-power (35mW total) red LEDs are also optional. These low-cost meters are fully self-contained and fully functional. Their subminiature (1.38" x 0.88" x 0.48"), epoxy-encapsulated cases incorporate built-in color filters and bezels; are moisture and vibration proof; and function well in the harshest environments. Their 12-pin, dual-in-line configuration offers component-like, plug-in convenience and maximum versatility. Operating temperature range is 0 to +60°C. The meters come with one of four, differential, input voltage ranges: ±200mV, ±2V ±20V or ±200V. Input impedance is a minimum 800kΩ. CMRR is typically 86dB (dc to 60Hz), and CMV is ±2V. Input overvoltage protection (on the non-inverting input) is ±250V. Devices are fully calibrated at the factory to an accuracy of ±1 count (±0.05% of full scale range) and never require calibration or adjustment. A DISPLAY ENABLE function permits the display to be disabled for "power-down" operation. All models have a DISPLAY TEST function. Standard red LED models offer an optional DISPLAY HOLD function. Small size, low cost and adjustment-free reliability make the DMS-20PC Series the best choice for all your 3½ digit, LED, DPM applications.

FEATURES

N Subminiature size: 1.38" x 0.88" x 0.48" (35mm x 22mm x 12mm) N Large (0.37"/9.4mm) LED display N Choice of 6 LED colors N High-intensity or low-power (7mA) red LEDs optional N Epoxy-encapsulated, 12-pin DIP package with built-in color filter and bezel N 4 differential input voltage ranges N Factory calibrated, ±1 count accuracy N Single +5V power supply N User-selectable decimal point placement N DISPLAY ENABLE function for "power-down" mode N DISPLAY TEST and HOLD (optional) functions N 0 to +60°C temperature range SIMPLIFIED SCHEMATIC DIAGRAM Figure 1. DMS-20PC Series simplified schematic

~ Applies for transient or continuous overvoltages applied to (+) INPUT HI (pin 11) with (–) INPUT LO (pin 12) properly connected. Pin 12 is not overvoltage protected (see Figure 1). Voltages applied to pin 12 should not exceed the supply voltage.  See Technical Notes. € The DISPLAY HOLD function is optional on standard red and green LED models only. Leave blank for standard models. Add -H for DISPLAY HOLD option (available on standard red and green LED models only). DMS-20PC - 1 - RS -C LED Color: AS = Standard Amber BS = Standard Blue GS = Standard Green OS = Standard Orange RS = Standard Red YS = Standard Yellow RH = High-Intensity Red RL = Low-Power Red BL = Low-Power Blue PGL = Low-Power Green Accessories: DMS-PS1-CM-C +5V/1.0A AC/DC power supply module DMS-20-CP Panel cutout punch DMS-BZL3-C DMS-20 bezel assembly DMS-BZL4-C DMS-20 bezel assembly with sealing gasket MOLEX connector, decimal point solder pads and attenuation resistor pads. Input Range: 0 = ±200mV 1 = ±2V 2 = ±20V 3 = ±200V A panel-mount retaining clip is supplied with each model. 1. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7) : Pin 8 is a precision reference actively trimmed at the factory. In normal operation, pin 8 must be tied to pin 7 to achieve all listed accuracy and drift specifica- tions. 2. ANALOG COMMON (Pin 10) : This pin is connected to an internal, low-noise, "relative" ground. It is used in certain differential and "floating" measurements as described in the Applications section of this data sheet and Ap Note 3 of the DATEL Panel Meter Catalog. Pin 10 should not be connected to pin 3 (5V RETURN) or to your system’s analog ground. 3. Decimal Point Placement : The location of the decimal point is user- selectable, and the decimal point control pins (DP1-DP3) are active low functions. Select the appropriate decimal point by tying the appropriate pin (pin 4, 5 or 6) to pin 3 (5V RETURN). Unused decimal point location pins should be left open. Hard wiring is preferable, however, you can use logic gates to exercise dynamic control over the location of the decimal point if the following drive conditions are met: Model Applied "0" Voltage Load Current* DMS-20PC-X-XL +0.05V max. 0.7mA max. All Others +0.4V max. 6mA max. * The driving gates must be able to sink this much current Analog Inputs Min. Typ. Max. Units Full Scale Input Range: DMS-20PC-0 – ±200 – mV DMS-20PC-1 – ±2 – Volts DMS-20PC-2 – ±20 – Volts DMS-20PC-3 – ±200 – Volts Input Impedence: DMS-20PC-0, -1 – 1000 – MΩ DMS-20PC-2, -3 – 1 – MΩ Overvoltage Protection ~ – – ±250 Volts Common Mode Voltage Range – – ±2 Volts CMRR (dc to 60Hz) –8 6–d B Performance Sampling Rate 2.5 reading per second Accuracy (3 minute warm-up): DMS-20PC-0 (Vin = +0.19V) – ±1 ±3 Counts DMS-20PC-1 (Vin = +1.9V) – ±1 ±3 Counts DMS-20PC-2 (Vin = +19V) – ±2 ±3 Counts DMS-20PC-3 (Vin = +190V) – ±2 ±3 Counts Zero Reading (Vin = 0 Volts) “–001” “000” “001” Temperature Drift (0 = +60°C) – ±0.2 ±0.4 Cnts/°C Power Supply Requirements Supply Voltage +4.75 +5.00 +5.25 Volts Supply Current: DMS-20PC-X-RL – +7 +12 mA DMS-20PC-X-BL & -PGL – +12 +17 mA DMS-20PC-X-RS, -RH – +60 +90 mA DMS-20PC-X-RS-H – +60 +90 mA DMS-20PC-X-BS – +75 +100 mA DMS-20PC-X-GS-H – +90 +120 mA DMS-20PC-X-AS, -GS, -OS, -YS – +90 +120 mA Display Display Type and Size 3½ digit, 0.37"/9.4mm high LED Polarity Indication Autopolarity ("–" for negative Vin) Overrange Indication "–1_ _ _" for negative inputs "1_ _ _" for positive inputs Physical/Environmental Operating Temperature 0 – +60 °C Storage Temperature –20 – +75 °C Humidity (non-condensing) 0 – 95 % Case Material Polycarbonate Weight 0.4 ounces (11 grams) Performance/Functional Specifications Typical at TA = +25°C and supply voltage = +5V using the single-ended input circuit, unless otherwise noted.

Ordering Information

RoHS Compliant Parts: Add "-C" suffix to part number. Add -C for RoHS Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com DMS-20PC Series 3½ Digit, LED Display, Low-Cost, Subminiature Digital Panel Voltmeters MPM_DMS_20PC.D02 Page 2 of 6 TECHNICAL NOTES

  1. DISPLAY TEST/HOLD (Pin 9) Function : Pin 9 is a dual-function pin. On all standard models (without "-H" suffix), tying pin 9 to pin 1 (+5V SUPPLY) activates the meter's DISPLAY TEST feature. All display segments, except the decimal points, will be illuminated. The display will show "1888" ("–1888" if a negative input signal is present). Do not leave the meter in the test mode for more than 10 seconds as this will cause the meter's operating temperature to rise and possibly affect its performance. Pin 9 must be left open when the test function is not being used. On models with the "-H" suffix (DMS-20PC-1-RS-H for example), pin 9 serves as a DISPLAY HOLD control pin. Tying pin 9 to +5V SUPPLY (pin 1) on these models will hold or "freeze" the current display read- ing indefinitely. Pin 9 must also be left open when the hold function is not being used. After disabling DISPLAY HOLD, allow the meter a full 10 seconds to resume normal calibrated operation before holding a new reading. The DISPLAY TEST or DISPLAY HOLD pin should normally be con- nected, via a selector switch, to pin 1 (+5V SUPPLY). If automatic, logic-controlled operation is desired, only PNP or MOSFET transis- tors should be used. The base or gate of these transistors should be driven sufficiently hard to bring pin 9 within 0.05V of +5V SUPPLY. 5. DISPLAY ENABLE (Pin 2) Function: On all models, tying pin 2 to pin 1 (+5V SUPPLY) applies full power to the LED display. This is the normal mode of operating the meter. Leaving DISPLAY ENABLE open (no connection), only turns off the LED display. The meter's analog- to-digital converter continues to sample the input signal. Total current consumption with the display off is approximately 400μA (0.4mA). This is a very useful feature if the meter is used in battery-powered equipment. With the exception of the low-power red LED models (DMS-20PC-X- RL), a regulated voltage lower than +5V SUPPLY can be used to dim the display intensity. Display intensity control is best performed with the high brightness, red LED, DMS-20PC-X-RH model. All low-power red LED models must have DISPLAY ENABLE tied directly to pin 1 (+5V SUPPLY). Voltages applied to DISPLAY ENABLE must never be greater than +5V SUPPLY. 6. Gain Adjust : There is a gain-adjust potentiometer on the back of each meter. It has approximately ±50 counts (±2.5%) range of adjustment. Since these devices essentially have no zero/offset errors, a gain adjustment is effectively an overall accuracy adjust- ment. Though they may be performed at any point (except zero), accuracy adjustments are most effective when performed with higher level input signals. The circuit shown in Figure 10 provides ±10% range of adjustment. 7. Soldering Methods : All models in the DMS-20PC Series easily with- stand most common wave soldering operations. We recommend, however, that you evaluate the effects your particular soldering techniques may have on the meter’s plastic case and high-precision electrical performance. We recommend the use of no-clean solders. 8. Suggested Mating Connectors: Panel mounted: Connector housing DATEL P/N 4320-01069-0 Terminal type DATEL P/N 4400-01032-0 Crimping tool DATEL P/N 39-2099000 Wire size 22 to 26 AWG Insulation diameter 0.062" (1.57mm) maximum Stripping length 0.100 to 0.125" (2.54 to 3.17mm) Board mounted: Socket DATEL P/N 4320-01074-0

Figure 2. Single-Ended Input Configuration are ones that have historically received many inquiries.

  1. In these high-voltage cases, pin 12 should always be tied to pin 3

(usually the black one) must be connected to pin 3 (5V RETURN).

  1. Single-Ended Input Configurations : True single-ended measure-

2 avoids problems normally associated with ground-loop currents.

APPLICATIONS

Figure 10. External Gain AdjustmentFigure 8. 4.5-18V Power Supply Monitor Figure 9. Basic DC Ammeter Circuit Figure 7. 4-to-20mA Current Loop Operation

  1. With 4mA applied, adjust the 50kΩ potentiometer (R2) to
  2. With 20mA applied, adjust the gain-adjust potentiometer

on the back of the meter to display a reading of "1000". utilized safely and correctly.

  1. Digital Ammeter: Digital ammeters are finding ever-increasing

DATEL's new Digital Panel Meter Databook.

  1. External Gain Adjustment: Connect REFERENCE OUT

with a precise, near-full-scale, input voltage.

  1. Power Supply Monitoring: One of the most common digital

ductor) to provide regulated 5V-power to the meter.

1.5 Amp (Load Current)

12 VOLTAGE

MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC ±0.02 (±0.51) 3 PL DEC ±0.010 (±0.254) LEAD DIMENSIONS: 0.025 (0.635) x 0.025 (0.635) NOMINAL RECOMMENDED PC BOARD FINISHED HOLE DIAMETER: MADE IN USA DMS-20PC-X-XX FRONT VIEW DP1 DP2 DP3 PIN #1 IDENTIFIER +5V SUPPLY DISPLAY ENABLE 5V RETURN DP3 DP2 DP1 (–) INPUT LO (+) INPUT HI ANALOG COMMON DISPLAY TEST/HOLD REFERENCE OUT REFERENCE IN 0.80 (20.3) 0.15 (3.8) TYP. 0.50 (12.7) 0.10 (2.5) TYP. 0.040 (1.02) 0.040 (1.02) 1.10 (27.9) 0.10 (2.5) TYP. 0.25 (6.4) TYP. 0.475 (12.07) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 0.88 (22.4) ® ® 0.170 (4.32) 0.150 (3.81) PIN 1 0.125 (3.175) DIAMETER (USE ONLY WHEN PC BOARD MOUNTING) CALIBRATION POTENTIOMETER HOLE LOCATION ® ® BEZEL PANEL #2-56 INSERT 0.156 (3.96) DEEP FRONT VIEW 1.280 (32.51) 0.187 (4.75) 1.826 (46.38) 0.838 (21.29) 1.626 (41.30) 1.07 (27.18) INTERNAL CORNER RADII: 0.032 (0.81) MAX. 0.093 (2.362) DIA (4 REQUIRED) 0.116 (2.95) PANEL CUTOUT 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. © 2008 Murata Power Solutions, Inc. USA: Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Japan: Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com China: Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com 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 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com 11/20/08 DMS-20PC Series 3½ Digit, LED Display, Low-Cost, Subminiature Digital Panel Voltmeters MPM_DMS_20PC.D02 Page 6 of 6 MECHANICAL SPECIFICATIONS BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT