DMS-20LCD MURATA-PS | Alldatasheet

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Technical content

3½ Digit, LCD Display Digital Panel Voltmeters 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 MPM_DMS20lcd.B03 Page 1 of 6 DMS-20LCD Series, 3½ Digit, LCD Display, Digital Voltmeters represent the ultimate combination of low price, low power, small size and high performance in digital meters. Epoxy encapsulated in a subminiature (1.38” x 0.88” x 0.43”), 12-pin DIP package, these completely self-contained, fully operational meters offer a combination of ruggedness, long-term reliability and component-like ease-of-use simply not available in any other meters. Incorporating a precision reference and a factory-calibrated, autozeroing A/D converter, DMS-20LCD meters are extremely accurate (±1 count) and are only slightly larger than their 0.37"/9.4mm, enhanced-contrast, LCD displays. All models incorporate a built-in bezel and are easily mounted in either panels or pc boards. Both backlit and non-backlit versions are available. DMS-20LCD meters have 4 differential input voltage ranges (±200mV, ±2V, ±20V and ±200V) and a user-friendly input structure. Input impedance is a minimum 800k7. CMRR is typically 86dB with a CMV of ±2V. Non-inverting inputs are overvoltage protected to ±100V (±250V for the ±200V input model). All DMS-20LCD meters operate from a single +5V supply (drawing 400μA) or a single +9V supply/battery (drawing 230μA). All models have a low-battery ("B") annunciator and feature autopolarity changeover and overrange indication. Also available is an application/evaluation board (DMS-EB2) that plugs directly onto the back of any DMS-20LCD allowing direct inputs for common applications such as 4-20mA inputs, zero/gain adjust, decimal point location, and input voltage dividing.

FEATURES

N Lowest power, 2mW N Subminiature size: 35mm x 22mm x 11mm N Large (0.37"/9.4mm), enhanced-contrast LCD display N Epoxy-encapsulated, 12-pin DIP N Panel or pc-board mountable N 4 differential input voltage ranges N High accuracy, ±1 count (±0.05%) N Single +5V supply or 9V battery N Low-battery annunciator N User-selectable decimal point placement N 0 to +60°C temperature range Ḥ SIMPLIFIED SCHEMATIC DIAGRAM (+) INPUT HI (–) INPUT LO ANALOG COMMON REFERENCE OUT REFERENCE IN +5V SUPPLY/ +BATTERY DP 1 DP 2 DP 3 4 9 DC/DC CONVERTER 5V RETURN/ –BATTERY +5V –5V z+2.0V DATA 909k A/D CONVERTER0 Vdc 0.01μF N.C. 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. DC/DC converter is not used on 9V-powered models, J1 is connected. N.C./BACKLIGHT Used on backlit models only. N.C. for non-backlit models. +5V Only used on ±200mV (-0) and ±2V (-1) models.

3½ Digit, LCD Display Digital Panel Voltmeters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com MPM_DMS20lcd.B03 Page 2 of 6 TECHNICAL NOTES Performance/Functional Specifications Typical at TA = +25°C and supply voltage = +5V (using the single-ended input circuit) or +9V (using the differential input circuit), unless otherwise noted. ~ 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.  Listed spec applies to 5V-powered models only. For 9V-powered models, both (–) INPUT LO (pin 12) and (+) INPUT HIGH (pin 11) must always be at least 1.5V above –BATTERY (pin 3) and at least 1.5V below +BATTERY (pin 1). € See Technical Notes. Leave blank for standard models. Add B for backlit models. DMS- 20LCD - 1 - 5 - C Accessories: 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 Power Source: 5 = +5V 9 = +9V 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 “float- ing” 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/–BATTERY) 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/–BATTERY). Unused decimal A panel-mount retaining clip is supplied with each model. Analog Inputs Min. Typ. Max. Units Full Scale Input Range: DMS-20LCD-0 – ±200 – mV DMS-20LCD-1 – ±2 – Volts DMS-20LCD-2 – ±20 – Volts DMS-20LCD-3 – ±200 – Volts Input Impedence: – DMS-20LCD-0, -1 100 1000 – M7 DMS-20LCD-2, -3 0.8 1 – M7 Overvoltage Protection ~ DMS-20LCD-0, -1, -2 – – ±100 Volts DMS-20LCD-3 – – ±250 Volts Common Mode Voltage Range – – ±2 Volts CMRR (dc to 60Hz) – 86 – dB Control Inputs  Decimal Pt. Placement (Pins 4-6) Tie to pin 3 to activate Functionality Tie to pin 3 to activate Logic Compatibility TTL (on 5V-powered models) Backlight (Pin 9) Tie to pin 3 to turn on backlight Performance Sampling Rate 2.5 reading per second Accuracy (1 minute warm-up): DMS-20PC-0 (Vin = +0.19V) – ±1 ±2 Counts DMS-20PC-1 (Vin = +1.9V) – ±1 ±2 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 (5V Models) Supply Voltage +4.75 +5.00 +5.25 Volts Supply Current: Standard Models – +400 +650 μA Backlit Models – +35 +50 mA Power Supply Requirements (9V Models) Supply Voltage +7.5 +9.0 +14.0 Volts Supply Current: Standard Models – +230 +350 μA Backlit Models – +35 +50 mA Display Display Type and Size 3½ digit, 0.37"/9.4mm high LCD Polarity Indication Autopolarity ("–" for negative Vin) Overrange Indication "–1_ _ _" for negative Vin "1_ _ _" for positive Vin

Ordering Information

Operating Temperature 0 – +60 °C Storage Temperature –20 – +75 °C Humidity (non-condensing) 0– 9 5 % Case Material Polycarbonate Weight 0.4 ounces (11 grams) Add -C for RoHS

3½ Digit, LCD Display Digital Panel Voltmeters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com MPM_DMS20lcd.B03 Page 3 of 6

APPLICATIONS

point location pins should be left open. For 5V-powered models, the decimal location pins are TTL compatible and may be hard wired as described above or driven with 5V TTL logic gates. DMS-20LCD meters are available in either 5V-powered or 9V-powered models. 9V devices operate directly from 7.5V to 14V supplies (usually batteries) without the need for external voltage regulators. 9V devices, however, can not be used to measure voltages referenced to the negative battery terminal (pin 3) because the minus input to the meter (pin 12, (–) INPUT LO) must always be at least 1.5V above pin 3. 9V-powered meters can only be used to make differential and not single-ended measurements. 5V-powered devices operate from any well-regulated +5V supply and will accurately measure voltages both above and below pin 3 (5V RETURN) in either single-ended or differential configurations. 1. Single-Ended Input Configurations: True single-ended measure- ments can only be made with 5V-powered meters. The circuit of Figure 2 avoids problems normally associated with ground-loop currents. Separate ground runs should be used for 5V RETURN (pin 3) and (–) INPUT LO (pin 12). 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

  1. Low Battery Annunciator: The “B” annunciator in the upper left-hand
  2. Gain Adjust: There is a gain-adjust potentiometer on the back of each

meter. It has approximately ±50 counts (±2.5%) range of adjustment. circuit shown in Figure 9 provides ±10% range of adjustment.

  1. Soldering Methods: All models in the DMS-20LCD Series easily

electrical performance. We recommend the use of no-clean solders.

  1. BACKLIGHT (Pin 9) Function: Grounding pin 9 (i.e. connecting it to

the meter will be reduced proportionately.

3½ Digit, LCD Display Digital Panel Voltmeters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com MPM_DMS20lcd.B03 Page 5 of 6 To calibrate the circuit of Figure 7, perform the following: 1. With 4mA applied, adjust the 50k7 potentiometer (R2) to display a reading of "000" (assuming that is the desired reading). 2. With 20mA applied, adjust the gain-adjust potentiometer on the back of the meter to display a reading of "1999". For different full scale readings, alter the value of R Shunt accordingly. R Shunt = R1 = VFsr /I Fsr Where: V Fsr = Full scale reading (in Volts) I Fsr = Relative full scale current (in Amps) Example: For a meter with a 2V full scale input (1.999 full scale reading) and a desired full scale display reading of 1000 (with an input of 20mA), VFsr = 1.000 Volts R Shunt = 1.000V/(0.020 – 0.004)A R Shunt = 1.000V/0.016A = 62.5 Ohms Figure 7. 4-to-20mA Current Loop Operation

  1. Power Supply Monitoring: A popular application for DATEL ’s low-

Therefore, the 9V battery voltage appears to the meter inputs as 0.9V. (pin 5 tied to pin 3), the meter reads 9.00 Volts. eter on the back of the DMS-20LCD until a similar reading is obtained. with TCR’s less than 50ppm/°C.

  1. External Gain Adjustment: Connect REFERENCE OUT

near-full-scale, input voltage. Figure 9. External Gain Adjustment Figure 8. Power Supply Monitor

12 VOLTAGE

For +5V models, tie (–) IN LO to pin 3.

BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT DMS-20LCD Series 3½ Digit, LCD Display Digital Panel Voltmeters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com 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 10/23/08 MPM_DMS20lcd.B03 Page 6 of 6 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-20LCD-X-XX FRONT VIEW DP1 DP2 DP3 PIN #1 IDENTIFIER +5V SUPPLY/ +BATTERY N.C. 5V RETURN/ –BATTERY DP3 DP2 DP1 (–) INPUT LO (+) INPUT HI ANALOG COMMON N.C./BACKLIGHT 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. 0.425 (10.80) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 0.88 (22.3) ® ® 0.160 (4.06) 0.160 (4.06) PIN 1 CALIBRATION POTENTIOMETER HOLE LOCATION 0.125 (3.175) DIAMETER (USE ONLY WHEN PC BOARD MOUNTING) ® ® BEZEL INSTALLATION BEZEL PANEL #2-56 INSERT 0.156 (3.96) DEEP FRONT VIEW 1.280 (32.51) 0.187 (4.75) OPTIONAL BEZEL (DMS-BZL3 and DMS-BZL4) RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS 1.826 (46.38) 0.838 (21.29) 1.336 (33.93) 1.626 (41.30) 1.07 (27.18) INTERNAL CORNER RADII: 0.032 (0.81) MAX. 0.145 (3.68) 0.093 (2.362) DIAMETER (4 REQUIRED) ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY 0.116 (2.95) ® ® RETAINING CLIP INSTALLATION PANEL