DMS-30LCD-2-5-C - Murata Power Solutions

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DMS-30LCD Series

3½ Digit, LCD Display Digital Panel Voltmeters

MPM_DMS30LCD.E01 Page 1 of 6

Offering all the outstanding features and beneﬁ ts of Murata Power Solutions’ industry

leading DMS-20LCD Series of 3½ Digit LCD Panel Meters, DMS-30LCD meters offer larger,

more easily readable displays at slightly higher power consumptions. Like all DMS Series

LCD meters, these miniature (2.17” x 0.92” x 0.43”), epoxy-encapsulated devices offer

component-like ease-of-use, outstanding reliability and easy installation in either panels or

pc-cards.

DMS-30LCD devices operate from a single +5V supply or a 9V battery. Battery-oper-

ated units typically draw 350μA and consume a mere 3.2mW. Backlit models are available

for low-light applications; though we have found many designers prefer Murata Power

Solutions’ unique low-power LED meters in those circumstances.

Offering 4 optional input voltage ranges (±200mV, ±2V, ±20V or ±200V), DMS-30LCD

meters have an extremely user-friendly input structure. They can be used in differential

or single-ended modes. Input impedance is a minimum 800kΩ. CMRR is typically 86dB.

CMV is ±2V, and inputs are overvoltage protected to ±100V.

Each meter incorporates an extremely stable, double regulated reference and is fully

calibrated at our factory prior to encapsulation. We guarantee outstanding initial accuracy

(±1 count) and excellent stability over temperature (±0.15 counts/°C). These extremely

rugged meters are moisture and vibration proof and never require adjustment or recalibra-

tion.

For popular applications (4-to-20mA, rms-to-dc conversion, ac line power, J and K

thermocouples, etc.), the DMS-30LCD Series includes a complete line of "plug-on" applica-

tion boards that conveniently convert your meter into an application-speciﬁ c instrument.

FEATURES

 Large (0.4"/10.2mm), enhanced-contrast, LCD display

 Single +5V supply or 9V battery

 Power as low as 3.2mW

 Miniature size:

2.17" x 0.92" x 0.43" (55mm x 23mm x 11mm)

 Epoxy-encapsulated, 12-pin DIP

 Backlit displays optional

 4 differential input voltage ranges

 High accuracy, ±1 count (±0.05%)

 Autopolarity changeover and overrange indication

 User-selectable decimal point placement

 Numerous "plug-on" application boards

 0 to +60°C temperature range

+1.23V REFERENCE OUT

(+) INPUT HI

ANALOG

(–) INPUT LO

COMMON

REFERENCE OUT

REFERENCE IN

DP 1

DP 2

DP 3

+5V SUPPLY/

+BATTERY

DC/DC

CONVERTER

5V RETURN/

+5V

–BATTERY

–5V

+5V

REF.

1.23V

DATA

+2.0V

V+

909k

V–

A/D

CONVERTER

0 Vdc

0.01µF

DISPLAY TEST/

BACKLIGHT

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.

1.82k

DC/DC converter is not used on 9V-powered models,

J1 is connected.

Display Test function is not available on backlit models.

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DMS-30LCD Series

3½ Digit, LCD Display Digital Panel Voltmeters

MPM_DMS30LCD.E01 Page 2 of 6

TECHNICAL NOTES

Performance/Functional Speciﬁ cations

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.

➀ 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.

➁ 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).

➂ See Technical Notes.

DMS-30LCD - 1 - 5 - C

Input Range:

0 = ±200mV

1 = ±2V

2 = ±20V

3 = ±200V

Accessories:

DMS-30-CP Panel cutout punch

DMS-BZL1-C DMS-30 bezel assembly

DMS-BZL2-C DMS-30 bezel assembly with sealing gasket

Add-On Application Boards:

DMS-EB-C Multi-purpose (gain/offset, 4-20mA, etc.)

DMS-EB-DC/DC-C Provides isolated +5V power

DMS-EB-RMS-C For true rms measurements of ac voltages

DMS-EB-AC/DC-C For ac line-powered applications

A panel-mount retaining clip is supplied with each model.

Leave blank for standard

models.

Add B for backlit models.

Power Source:

5 = +5V

9 = +9V

1. +1.23V REFERENCE OUTPUT (Pin 9): This pin is the output of the

meter’s precision +1.23V internal reference, and it is referenced to

ANALOG COMMON (pin 10) which sits at a potential of approximately

+2V. This output should be buffered if used to drive external loads

since sourcing more than 15µA from pin 9 can affect both the initial

accuracy and temperature drift of the meter.

2. ANALOG COMMON (Pin 10): This pin is connected to an internal,

low-noise, “relative” ground. It is used in certain differential and “ﬂ oat-

ing” measurements as described in the Applications section of this data

sheet and Ap Note DMS-AN3 at

http://www.murata-ps.com/data/meters/dms-an3.pdf. Pin 10 should

not be connected to pin 3 (5V RETURN/–BATTERY) or to your

system’s analog ground.

Analog Inputs Min. Typ. Max. Units

Full Scale Input Range:

DMS-30LCD-0 – ±200 – mV

DMS-30LCD-1 – ±2 – Volts

DMS-30LCD-2 – ±20 – Volts

DMS-30LCD-3 – ±200 – Volts

Input Impedence:

DMS-30LCD-0, -1 100 1000 – MΩ

DMS-30LCD-2, -3 0.8 1 – MΩ

Overvoltage Protection ➀––

DMS-30LCD-0, -1, -2 – – ±100 Volts

DMS-30LCD -3 – – ±250 Volts

Common Mode Voltage Range ➁– – ±2 Volts

CMRR (dc to 60Hz) – 86 – dB

Control Inputs ➂

Decimal Pt. Placement (Pins 4-6):

Functionality

Logic Compatibility

Tie to pin 3 to activate

TTL (on 5V-powered models)

Display Test (Pin 2) Tie to pin 1 to activate

Backlight (Pin 2) Tie to pin 3 to turn on backlight

Performance

Sampling Rate 2.5 reading per second

Accuracy (1 minute warm-up):

DMS-30LCD-0 (Vin = +0.19V) – ±1 ±2 Counts

DMS-30LCD-1 (Vin = +1.9V) – ±1 ±2 Counts

DMS-30LCD-2 (Vin = +19V) – ±2 ±3 Counts

DMS-30LCD-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

+1.23V Reference Out (Pin 9) +1.20 +1.23 +1.25 Volts

Power Supply Requirements (5V Models)

Supply Voltage +4.75 +5.00 +5.25 Volts

Supply Current:

Standard Models – 800 1200 µA

Backlit Models – 45 60 mA

Power Supply Requirements (9V Models)

Supply Voltage +7.5 +9.00 +14.0 Volts

Supply Current:

Standard Models – 350 600 µA

Backlit Models – 45 60 mA

Display

Display Type and Size 3½ digit, 0.4"/10.2mm high LCD

Polarity Indication Autopolarity ("–" for negative Vin)

Overrange Indication "–1_ _ _ " for negative inputs

"1_ _ _ " for positive inputs

Ordering Information

Physical/Environmental

Operating Temperature 0 – +60 °C

Storage Temperature –20 – +75 °C

Humidity (non-condensing) 0 – 95 %

Case Material Polycarbonate

Weight 0.75 ounces (21 grams)

Add -C for RoHS

See www.murata-ps.com/dpm-availability for model-speciﬁ c availability.

www.murata-ps.com/support

DMS-30LCD Series

3½ Digit, LCD Display Digital Panel Voltmeters

MPM_DMS30LCD.E01 Page 3 of 6

APPLICATIONS

Figure 2. Single-Ended Input Conﬁ guration

(5V-Powered Models)

Example: If +BATTERY (pin 1 with respect to pin 3) is +12.6V,

RSeries = Ohms

+12.6 – 9.2V

0.035

RSeries = Ohms

+BATTERY – 9.2V

0.035

RSeries = 97 Ohms

In any backlit application, including those with supply voltages

< 9.2V, 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 2. The brightness of the backlight will be reduced

proportionately.

7. Gain Adjust: There is a gain-adjust potentiometer on the back of each

meter. It has approximately ±50 counts (±2.5%) of adjustment range.

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.

Refer to Figure 9 for applications requiring greater ( ±10%) gain adjust-

ments.

DMS-30LCD 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 conﬁ gurations.

1. Single-Ended Input Conﬁ gurations: 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. Soldering Methods: All models in the DMS-30LCD Series easily

withstand most common wave soldering operations. We recommend,

however, 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 lead-free solders.

9. Suggested Mating Connectors:

Panel mounted:

Connector housing Murata Power Solutions P/N 4320-01069-0

Terminal type Murata Power Solutions P/N 4400-01032-0

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 Murata Power Solutions P/N 4320-01074-0

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 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. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a preci-

sion reference actively trimmed at the factory. In normal operation, pin

8 must be tied to pin 7 to achieve all listed accuracy and drift speciﬁ ca-

tions.

5. DISPLAY TEST (Pin 2): (Not available on backlit models)

Connect DISPLAY TEST (pin 2) to +5V SUPPLY/+BATTERY

(pin 1) to activate. All LCD segments, exclusive of the decimal points,

will be momentarily enabled. Do not leave the unit in the TEST

mode for more than 10 seconds as this will damage the LCD seg-

ments.

6. BACKLIGHT (Pin 2) Function: For backlit models, grounding pin 2

(i.e. connecting it to pin 3) turns on the backlighting LED’s. 9V-pow-

ered 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 2 in these situations. The value of the series resis-

tor is determined using the following formula:

+5V SUP

(–) IN LO

5V RET

120 VAC

(+) IN HI

DP1

–

AC to DC Converter

DMS-30LCD-1-5

REF OUT

REF IN

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DMS-30LCD Series

3½ Digit, LCD Display Digital Panel Voltmeters

MPM_DMS30LCD.E01 Page 4 of 6

APPLICATIONS

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 “ﬂ oating” input is a signal that has no galvanic connection to the

meter’s power supply. In the ﬁ gures below, the 1.5V battery illustrates a

true ﬂ oating input.

Figure 3. Differential Input Conﬁ guration

(5V-Powered Models)

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-ﬁ lm resistors with absolute TCR’s less than

50ppm/°C. See Ap Note 4 for more information on engineering scaling.

R1 + R2

x VIN = Reading

50kΩ < R1 + R2 < 10MΩ

Figure 6. Floating Input Measurements

(9V-Powered Models)

Figure 5. Floating Input Measurements

(5V-Powered Models)

Figure 4. Input Attenuation Circuit

2. Differential Input Conﬁ gurations: 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 demon-

strate the concept of a differential input signal. Be careful not to exceed

the ±2V common mode voltage limitation for 5V-powered meters.

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-30LCD 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:

+ BAT

–BAT

DP1

BATTERY

(–) IN LO

ANA COMM

(+) IN HI

CELL

1.5V

–

REF OUT

REF IN

DMS-30LCD-1-9

+5V SUP

(–) IN LO

5V RET

120 VAC

(+) IN HI

AC to DC Converter

7REF IN

DP1

REF OUT

DMS-30LCD-1-5

(+) IN HI

(–) IN LO

–

+5V SUP 5V RET

120 VAC

AC to DC Converter

REF OUT

REF IN

DMS-30LCD-1-5

+5V SUP 5V RET

120 VAC

DP1

AC to DC Converter

(–) IN LO

ANA COMM

(+) IN HI

CELL

1.5V

–

REF OUT

REF IN

DMS-30LCD-1-5

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DMS-30LCD Series

3½ Digit, LCD Display Digital Panel Voltmeters

MPM_DMS30LCD.E01 Page 5 of 6

APPLICATIONS

(R1 + R2 + R3) = 0.1

Figure 7. 4-to-20mA Current Loop Operation

(5V-Powered Models)

Figure 9. External Gain Adjustment

Figure 8. Power Supply Monitor

(9V-Powered Models)

6. Power Supply Monitoring: A popular application for Murata Power

Solutions’ low-power LCD meters is monitoring the supply voltage in

battery-operated portable equipment. Figure 8 demonstrates how a

9V-powered DMS-30LCD can be used to monitor its own supply. The

meter used is the DMS-30LCD-1-9. A three-resistor voltage divider is

used to attenuate the battery voltage and also to satisfy the require-

ment 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 (+BAT-

TERY) and 3 (–BATTERY). The divider should be designed so that

1/10th the battery voltage falls across the inputs to the meter:

To calibrate the circuit of Figure 7, perform the following:

1. With 4mA applied, adjust the 50kΩ 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 RShunt value accordingly.

Shunt = R1 = VFsr /IFsr

Where: VFsr = 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

RShunt = 1.000V/(0.020 – 0.004)A

Shunt = 1.000V/0.016A = 62.5 Ohms

7. External Gain Adjustment: Connect REFERENCE OUT

(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, opera-

tion. Use the +1.23V REFERENCE OUT (pin 9) for applications need-

ing external gain adjustment. Figure 9 shows the wiring conﬁ guration

for each model. Calibration is performed with a precise, near-full-scale,

input voltage.

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 ﬁ rst measuring the actual battery volt-

age with another meter and then adjusting the gain-adjust potentiom-

eter on the back of the DMS-30LCD until a similar reading is obtained.

If possible, the resistors in the divider should be ±1% metal-ﬁ lm types

with TCR’s less than 50ppm/°C.

+BAT

(–) IN LO

–BAT

DP2

(+) IN HI

45.3k

10.1k

45.3k

BATTERY

–

REF OUT

REF IN

DMS-30LCD-1-9

(+) IN HI

(–) IN LO

ANA COMM 1.23V REF

REF IN

10 to 20 Turns

8.45k, 1%

5V RET

8.45k, 1%

For 5V models tie

(–) IN LO to pin 3

For 9V models tie

(–) IN LO to pin 10

VOLTAGE

OUT

COM

CALIBRATOR

Connections

for ±2V and

±20V models

Connections

for ±200mV

models

DMS-30LCD

+5V SUP 5V RET

120 VAC

AC to DC Converter

(–) IN LO

ANA COMM

(+) IN HI

–

4-20mA

50k

REF OUT

REF IN

DMS-30LCD-1-5

www.murata-ps.com/support

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

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 U.S.A.

ISO 9001 and 14001 REGISTERED

This product is subject to the following operating requirements

and the Life and Safety Critical Application Sales Policy:

Refer to: http://www.murata-ps.com/requirements/

DMS-30LCD Series

3½ Digit, LCD Display Digital Panel Voltmeters

MPM_DMS30LCD.E01 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:

0.042 ±0.003 (1.067 ±0.076)

MADE IN USA

BEZEL INSTALLATION

PANEL

BEZEL

#2-56 INSERT

FRONT VIEW 0.156 (3.96) DEEP

1.270

(32.26)

0.187

(4.75)

2.35 (59.69)

2.118 (53.80)

RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS

0.093 (2.362) DIAMETER (4 REQUIRED)

ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY

INTERNAL CORNER RADII:

1.07

0.032 (0.81) MAX.

(27.18)

0.878

(22.30)

0.096

(2.44)

0.116

(2.95)

2.55 (64.77)

PANEL CUTOUT

RETAINING CLIP INSTALLATION

PANEL

MADE IN USA

PIN #1

DMS-30LCD-X-XX

IDENTIFIER

FRONT VIEW

+5V SUPPLY/ +BATTERY

DISPLAY TEST/BACKLIGHT

DP3

5V RETURN/ –BATTERY

DP2

DP1

(–) INPUT LO

(+) INPUT HI

ANALOG COMMON

+1.23V REFERENCE OUT

REFERENCE OUT

DP1

REFERENCE IN

DP2 DP3

2.17

(55.1)

2.09

(53.1)

1.80

(45.7)

0.15

TYP.

0.25 (6.4) TYP.

(3.7)

0.040

(1.02)

0.040

(1.02) 0.10

(2.5)

TYP.

0.50

(12.7)

0.17

(4.3)

TYP.

0.92

(23.4)

0.84

(21.3)

0.430 (10.92) STANDARD

0.560 (14.22) BACKLIT

0.040

(1.02)

0.240

(6.10)

0.260

(6.60)

PIN 1

CALIBRATION POTENTIOMETER HOLE LOCATION

0.125 (3.175) DIAMETER

(USE ONLY WHEN PC BOARD MOUNTING)

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

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