View DMS-20LCD-2-5-C_4408201.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

DMS-20LCD Series
31/2 Digit, LCD Display Digital Panel Voltmeters
FEATURES
Lowest cost Lowest power, 2mW Subminiature size: 1.38" x 0.88" x 0.43" 35mm x 22mm x 11mm Large (0.37"/9.4mm), enhanced-contrast LCD display Epoxy-encapsulated, 12-pin DIP Panel or pc-board mountable 4 differential input voltage ranges High accuracy, 1 count (0.05%) Single +5V supply or 9V battery Low-battery annunciator User-selectable decimal point placement 0 to +60C temperature range
DMS-20LCD Series, 31/2 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 800k . 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 400A) or a single +9V supply/battery (drawing 230A). 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.
SIMPLIFIED SCHEMATIC DIAGRAM
+5V +5V SUPPLY/ 1 +BATTERY -5V N.C. 2 DC/DC CONVERTER
3
V+
2
12 (-) INPUT LO 0.01F R2
1
R1 V- +2.0V 909k
11
(+) INPUT HI
5V RETURN/ 3 -BATTERY
J1 0 Vdc
A/D CONVERTER
10 ANALOG COMMON
DATA DP 3 4
9 N.C./BACKLIGHT
4
5 DP 2 +5V
8 REFERENCE OUT
6 DP 1
7
REFERENCE IN
1
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.
3
DC/DC converter is not used on 9V-powered models, J1 is connected. Used on backlit models only. N.C. for non-backlit models.
2
4
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
31/2 Digit, LCD Display Digital Panel Voltmeters
Performance/Functional Specifications
Typical at TA = +25C and supply voltage = +5V (using the single-ended input circuit) or +9V (using the differential input circuit), unless otherwise noted. Analog Inputs Full Scale Input Range: DMS-20LCD-0 DMS-20LCD-1 DMS-20LCD-2 DMS-20LCD-3 Input Impedence: DMS-20LCD-0, -1 DMS-20LCD-2, -3 Overvoltage Protection DMS-20LCD-0, -1, -2 DMS-20LCD-3 Common Mode Voltage Range CMRR (dc to 60Hz) Control Inputs Decimal Pt. Placement (Pins 4-6) Functionality Logic Compatibility Backlight (Pin 9) Performance Sampling Rate Accuracy (1 minute warm-up): DMS-20PC-0 (Vin = +0.19V) DMS-20PC-1 (Vin = +1.9V) DMS-20PC-2 (Vin = +19V) DMS-20PC-3 (Vin = +190V) Zero Reading (Vin = 0 Volts) Temperature Drift (0 = +60C) - - - - "-001" - 1 1 2 2 "000" 0.2 2 2 3 3 "001" 0.4 Cnts/C Counts Counts Counts Counts 2.5 reading per second Tie to pin 3 to activate Tie to pin 3 to activate TTL (on 5V-powered models) Tie to pin 3 to turn on backlight Input Range: 0 = 200mV 1 = 2V 2 = 20V 3 = 200V Accessories: DMS-20-CP DMS-BZL3-C DMS-BZL4-C DMS-EB2-C - - - - - - - 86 100 250 2 - Volts Volts Volts dB - - - - - 100 0.8 1000 1 - - M M 200 2 20 200 - - - - mV Volts Volts Volts Min. Typ. Max. Units Physical/Environmental Operating Temperature Storage Temperature Humidity (non-condensing) Case Material Weight 0 -20 0 - - - +60 +75 95 C C %
Polycarbonate 0.4 ounces (11 grams)
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.
Ordering Information
DMS-20LCD - 1 - 5
-C
Add -C for RoHS Leave blank for standard models. Add B for backlit models.
Power Source: 5 = +5V 9 = +9V Panel cutout punch DMS-20 bezel assembly DMS-20 bezel assembly with sealing gasket Application/evaluation board with standard MOLEX connector, decimal point solder pads and attenuation resistor pads.
A panel-mount retaining clip is supplied with each model.
Power Supply Requirements (5V Models) Supply Voltage Supply Current: Standard Models Backlit Models - - +400 +35 +650 +50 A mA +4.75 +5.00 +5.25 Volts
TECHNICAL NOTES
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 specifications. 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/-BATTERY) or to your system's analog ground. 3. Decimal Point Placement: The location of the decimal point is userselectable, 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
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Power Supply Requirements (9V Models) Supply Voltage Supply Current: Standard Models Backlit Models Display Display Type and Size Polarity Indication Overrange Indication 31/2 digit, 0.37"/9.4mm high LCD Autopolarity ("-" for negative Vin) "-1_ _ _ " for negative Vin "1_ _ _ " for positive Vin - - +230 +35 +350 +50 A mA +7.5 +9.0 +14.0 Volts
www.murata-ps.com
MPM_DMS20lcd.B03 Page 2 of 6
DMS-20LCD Series
31/2 Digit, LCD Display Digital Panel Voltmeters
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. 4. BACKLIGHT (Pin 9) Function: Grounding pin 9 (i.e. connecting it to pin 3) turns on the backlighting LED's. For non-backlit models, pin 9 has no internal connection. All backlit models include internal currentlimiting resistors. With nominal +5V or 9V supplies, backlit devices typically draw 35mA of supply current. The current drawn by the backlight (and therefore the current drawn by the meter) can be reduced by installing a 1/4 Watt resistor between pins 3 and 9. The brightness of the meter will be reduced proportionately. 9V-powered backlit models function with supply voltages up to +14V, however, activating the backlight with voltages greater than 9.2V can damage the meter. Therefore, a 1/4 Watt series resistor must be installed between pins 3 and 9 in these situations. The value of the series resistor is determined using the following formula: +BATTERY - 9.2V 0.035 8. Suggested Mating Connectors: Panel mounted: Connector housing Terminal type Crimping tool Wire size Insulation diameter Stripping length Board mounted: Socket DATEL P/N 4320-01069-0 DATEL P/N 4400-01032-0 DATEL P/N 39-2099000 22 to 26 AWG 0.062" (1.57mm) maximum 0.100 to 0.125" (2.54 to 3.17mm)
DATEL P/N 4320-01074-0
APPLICATIONS
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 measurements 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).
DMS-20LCD-1-5
8 REF OUT
RSeries =
Ohms
Example: If +BATTERY (pin 1 with respect to pin 3) is +12.6V, RSeries = +12.6 - 9.2V 0.035 Ohms
RSeries = 97 Ohms 5. Low Battery Annunciator: The "B" annunciator in the upper left-hand corner of the display turns on when the supply voltage for 5V-powered models falls below approximately +3.7V, or when the supply voltage for 9V-powered models falls below approximately 7.2V. However, the lowbattery annunciator's turn-on threshold can vary significantly from unitto-unit: as low as 2.7V for 5V-powered meters, and as low as 5.4V for 9V-powered models. Applications that use the LOW BAT annunciator must be fully tested by the user, using a combination of low supply voltages and the input signal's minimum and maximum levels, to ensure that all display readings are valid as long as the LOW BAT annunciator remains off. 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 adjustment. 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 9 provides 10% range of adjustment. 7. Soldering Methods: All models in the DMS-20LCD Series easily withstand 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.
+ VIN -
11 (+) IN HI
12 (-) IN LO 1 +5V SUP 6 DP1 3
7 REF IN
5V RET
120 VAC
DATEL UPA-5/500
AC to DC Converter
Figure 2. Single-Ended Input Configuration (5V-Powered Models)
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS20lcd.B03 Page 3 of 6
DMS-20LCD Series
31/2 Digit, LCD Display Digital Panel Voltmeters
APPLICATIONS
2. Differential Input Configurations: Differential measurements can be made with either 5V-powered or 9V-powered meters. Figure 3, though not a practical real-world application, uses a voltage divider to demonstrate the concept of a differential input signal. Be careful not to exceed the 2V common mode voltage limitation for 5V powered meters.
R1 1k
4. Floating Signal Source Measurements: Floating signals can be measured using the circuits shown in Figures 5 and 6. Figure 5 uses a 5V-powered meter. Figure 6 uses a 9V-powered meter. Connecting pin 10 (ANALOG COMMON) to (-) INPUT LO (pin 12) provides the reference point for the meter's input. A "floating" input is a signal that has no galvanic connection to the meter's power supply. In the figures below, the 1.5V battery illustrates a true floating input.
11 (+) IN HI
DMS-20LCD-1-5
REF OUT 8
11 (+) IN HI
REF IN
7
DP1 6
12 (-) IN LO
R2 1k
DMS-20LCD-1-5
8 REF OUT
1 +5V SUP
3 5V RET
R3 1k
1.5V CELL
+
-
12 (-) IN LO
120 VAC
DATEL UPA-5/500
7 REF IN 1 3 5V RET 6 DP1
+5V SUP
AC to DC Converter
Figure 3. Differential Input Configuration (5V-Powered Models)
120 VAC
DATEL UPA-5/500
AC to DC Converter
3. Engineering Scaling: For measuring voltages greater than the full scale input range of a given meter, the input signal must be attenuated. A simple voltage divider (similar to that shown in Figure 4) will scale the input to within the range of the selected meter. R1 and R2 should be precision, 1%, metal-film resistors with absolute TCR's less than 50ppm/C. See Ap Note 4 for more information on engineering scaling. 50k < R1 + R2 < 10M R2 R1 + R2
+
1.5V CELL +
Figure 5. Floating Input Measurements (5V-Powered Models)
11 (+) IN HI 10 ANA COMM 12 (-) IN LO 1 + BAT
DMS-20LCD-1-5
8 REF OUT
- 7 REF IN 3 -BAT
+
x VIN = Reading
6 DP1
9V BATTERY
R1 VIN R2
11 (+) IN HI
DMS-20LCD-1-5 DMS-20LCD-1-9
-
8 REF OUT
-
12 (-) IN LO 7 REF IN 1 +5V SUP 3 5V RET
Figure 6. Floating Input Measurements (9V-Powered Models)
120 VAC
DATEL UPA-5/500
AC to DC Converter
Figure 4. Input Attenuation Circuit
5. Process Control (4-to-20mA) Measurements: In many common process-control applications, a 4-to-20mA current loop is used to transmit information. Because DMS-20LCD meters have such high input impedance, a simple shunt resistor across the meter's input can be used to convert the loop current to a voltage. See Figure 7. The value of the shunt resistor is a function of the scaling requirements of the particular application and can be calculated using the following equation:
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS20lcd.B03 Page 4 of 6
DMS-20LCD Series
31/2 Digit, LCD Display Digital Panel Voltmeters
APPLICATIONS
RShunt = R1 = VFsr / IFsr Where: VFsr = Full scale reading (in Volts) IFsr = 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 RShunt = 1.000V/(0.020 - 0.004)A RShunt = 1.000V/0.016A = 62.5 Ohms
REF OUT 8
Therefore, the 9V battery voltage appears to the meter inputs as 0.9V. With the decimal point moved to its DP2 position (pin 5 tied to pin 3), the meter reads 9.00 Volts. The circuit can be calibrated by first measuring the actual battery voltage with another meter and then adjusting the gain-adjust potentiometer on the back of the DMS-20LCD until a similar reading is obtained. If possible, the resistors in the divider should be 1% metal-film types with TCR's less than 50ppm/C.
DMS-20LCD-1-9
11 (+) IN HI R1 45.3k
To calibrate the circuit of Figure 7, perform the following: 1. With 4mA applied, adjust the 50k 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 RShunt accordingly.
REF IN 7 1 +BAT 9V BATTERY -
+
12 (-) IN LO
R2 10.1k
3 -BAT
5 DP2
R3 45.3k
11 (+) IN HI 10 ANA COMM 12 (-) IN LO
DMS-20LCD-1-5
8 REF OUT
Figure 8. Power Supply Monitor (9V-Powered Models)
4-20mA
6. Power Supply Monitoring: A popular application for DATEL's lowpower LCD meters is monitoring the supply voltage in battery-operated portable equipment. Figure 8 demonstrates how a 9V-powered DMS-20LCD can be used to monitor its own supply. The meter used is the DMS-20LCD-1-9. A three-resistor voltage divider is used to attenuate the battery voltage and also to satisfy the requirement that the input voltages applied to pins 12 and 11 be at least 1.5 Volts above and below the battery voltage applied to pins 1 (+BATTERY) and 3 (-BATTERY). The divider should be designed so that 1/10th the battery voltage falls across the inputs to the meter: R2 = 0.1 (R1 + R2 + R3)
+
R1
7 REF IN 1 3 5V RET
R2
+5V SUP
-
50k
7. External Gain Adjustment: Connect REFERENCE OUT (pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, operation. Use the circuit shown in Figure 9 for applications needing external gain adjustment. Calibration is performed with a precise, near-full-scale, input voltage.
11 (+) IN HI
120 VAC
DATEL UPA-5/500
DMS-20LCD
OUT VOLTAGE CALIBRATOR
COM 3 5V RET/ -BAT IN 12 (-) IN LO 10 ANA COMM 8 NC 8.06k, 1% 7 REF IN 2k 17.4k, 1% 1 +5V IN/ +BAT IN Connections for 2V, 20V and 200V models
AC to DC Converter
12
Figure 7. 4-to-20mA Current Loop Operation (5V-Powered Models)
For +5V models, tie (-) IN LO to pin 3. For +9V models, tie (-) IN LO to pin 10 732, 1% 200 = 10 to 20 Turns 24.3k, 1%
Connections for 200mV models
Figure 9. External Gain Adjustment
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS20lcd.B03 Page 5 of 6
DMS-20LCD Series
31/2 Digit, LCD Display Digital Panel Voltmeters
MECHANICAL SPECIFICATIONS
DMS-20LCD-X-XX FRONT VIEW +5V SUPPLY/ +BATTERY N.C. 5V RETURN/ -BATTERY DP3 DP2 DP1 1 2 3 4 5 6 12 11 10 9 8 7 (-) INPUT LO (+) INPUT HI ANALOG COMMON N.C./BACKLIGHT REFERENCE OUT REFERENCE IN DP1 0.88 (22.3) DP2 1.38 (35.1) 1.30 (33.0) DP3 0.040 (1.02) 1.10 (27.9) 0.040 (1.02)
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: 0.042 0.003 (1.067 0.076)
PIN #1 IDENTIFIER
MADE IN USA
CALIBRATION POTENTIOMETER HOLE LOCATION
PIN 1
0.160 (4.06)
0.160 (4.06)
0.125 (3.175) DIAMETER (USE ONLY WHEN PC BOARD MOUNTING)
0.80 (20.3)
0.040 (1.02) 0.15 (3.8) TYP. 0.50 (12.7)
0.10 (2.5) TYP.
BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT
OPTIONAL BEZEL (DMS-BZL3 and DMS-BZL4)
#2-56 INSERT 0.156 (3.96) DEEP FRONT VIEW 0.187 (4.75)
BEZEL INSTALLATION
PANEL
(R) (R)
1.280 (32.51)
1.826 (46.38)
BEZEL
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII: 0.032 (0.81) MAX.
RETAINING CLIP INSTALLATION
1.07 (27.18)
0.838 (21.29)
1.336 (33.93) 1.626 (41.30) 0.093 (2.362) DIAMETER (4 REQUIRED) ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY
0.145 (3.68)
(R) (R)
0.116 (2.95)
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
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
10/23/08
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.
www.murata-ps.com
MPM_DMS20lcd.B03 Page 6 of 6
(R)
(R)
0.425 (10.80) 0.25 (6.4) TYP.
0.10 (2.5) TYP.
PANEL

▲Up To Search▲

Price & Availability of DMS-20LCD-2-5-C

	To Download DMS-20LCD-2-5-C Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .