MURATA-PS DMS

DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
FEATURES
N
Large (0.4"/10.2mm), enhanced-contrast, LCD display
N
Single +5V supply or 9V battery
N
Power as low as 3.2mW
N
Miniature size:
2.17" x 0.92" x 0.43" (55mm x 23mm x 11mm)
N
Epoxy-encapsulated, 12-pin DIP
N
Backlit displays optional
N
4 differential input voltage ranges
N
High accuracy, ±1 count (±0.05%)
N
Autopolarity changeover and overrange indication
N
User-selectable decimal point placement
N
Numerous "plug-on" application boards
N
0 to +60°C temperature range
Offering all the outstanding features and benefits of DATEL’s industry leading DMS20LCD 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-operated 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 DATEL’s 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 recalibration.
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" application boards that conveniently convert your meter into an application-specific instrument.
+5V
+5V SUPPLY/ 1
+BATTERY
12
V+
0.01μF
–5V
3
DISPLAY TEST/ 2
BACKLIGHT
DC/DC 2
CONVERTER
5V RETURN/ 3
–BATTERY
J1
R2
R1
V–
(–) INPUT LO
1
11
(+) INPUT HI
909k
z+2.0V
0 Vdc
10 ANALOG
COMMON
A/D
CONVERTER
1.23V
REF.
DATA
DP 3
9
4
+1.23V REFERENCE OUT
1.82k
DP 2
5
8
REFERENCE OUT
+5V
DP 1
1
7
6
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.
REFERENCE IN
2
DC/DC converter is not used on 9V-powered models,
J1 is connected.
3
Display Test function is not available on backlit models.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30LCD.D01 Page 1 of 6
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
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.
Analog Inputs
Min.
Typ.
Max.
Units
Operating Temperature
Full Scale Input Range:
DMS-30LCD-0
Physical/Environmental
–
±200
–
mV
Storage Temperature
DMS-30LCD-1
–
±2
–
Volts
Humidity (non-condensing)
DMS-30LCD-2
–
±20
–
Volts
Case Material
Volts
Weight
DMS-30LCD-3
–
±200
–
Input Impedence:
DMS-30LCD-0, -1
100
1000
–
M7
DMS-30LCD-2, -3
0.8
1
–
M7
–
–
±250
Volts
–
–
±100
Volts
Overvoltage Protection ~
DMS-30LCD-0, -1
DMS-30LCD-2, -3
–
–
±250
Volts
Common Mode Voltage Range 
–
–
±2
Volts
CMRR (dc to 60Hz)
–
86
–
dB
0
–
+60
°C
–20
–
+75
°C
0
–
95
%
Polycarbonate
0.75 ounces (21 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
Control Inputs €
DMS-30LCD - 1 - 5
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
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
Counts
DMS-30LCD-3 (Vin = +190V)
Zero Reading (Vin = 0 Volts)
–
±2
±3
“–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
Add -C for RoHS
Input Range:
0 = ±200mV
1 = ±2V
2 = ±20V
3 = ±200V
2.5 reading per second
Accuracy (1 minute warm-up):
"–1_ _ _ " for negative inputs
"1_ _ _ " for positive inputs
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-C
Power Source:
5 = +5V
9 = +9V
Accessories:
DMS-30-CP
DMS-BZL1-C
DMS-BZL2-C
RN-DMS
Leave blank for standard
models.
Add B for backlit models.
Panel cutout punch
DMS-30 bezel assembly
DMS-30 bezel assembly with sealing gasket
Gain/offset potentiometer kit for DMS-EB,
DMS-EB-AC/DC and DMS-EB-DC/DC
Add-On Application Boards:
DMS-EB-C
Multi-purpose (gain/offset, 4-20mA, etc.)
DMS-EB-HTB-C
High-accuracy temperature probe sensing for
±200mV models
DMS-EB-DC/DC-C
Provides isolated +5V power
DMS-EB-TCJ-C
J-type thermocouple inputs for ±2V models
DMS-EB-TCK-C
K-type thermocouple inputs for ±2V models
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.
TECHNICAL NOTES
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 “floating” measurements as described in the Applications section of this
data sheet and Ap Note 3 of the DATEL Panel Meter Catalog. Pin 10
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30LCD.D01 Page 2 of 6
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
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 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 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.
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 segments.
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-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 2 in these situations. The value of the series resistor is determined using the following formula:
RSeries =
+BATTERY – 9.2V
Example: If +BATTERY (pin 1 with respect to pin 3) is +12.6V,
RSeries =
9. Suggested Mating Connectors:
Panel mounted:
Connector housing
Terminal type
Crimping tool
Wire size
Insulation diameter
Stripping length
DATEL P/N 39-2079400
DATEL P/N 39-2099090
DATEL P/N 39-2099000
22 to 26 AWG
0.062” (1.57mm) maximum
0.100 to 0.125” (2.54 to 3.17mm)
Board mounted:
Socket DATEL P/N 39-2359625
APPLICATIONS
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 configurations.
Ohms
0.035
+12.6 – 9.2V
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 solders.
Ohms
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 adjustments.
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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-30LCD-1-5
11
(+) IN HI
+
8
REF OUT
VIN
–
12
(–) IN LO
7
REF IN
1
+5V SUP
120 VAC
6
DP1
3
5V RET
DATEL
UPA-5/500
AC to DC Converter
Figure 2. Single-Ended Input Configuration
(5V-Powered Models)
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30LCD.D01 Page 3 of 6
DMS-30LCD Series
3½ 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.
8
REF IN
7
11
(+) IN HI
12
(–) IN LO
DP1 6
DMS-30LCD-1-5
11
(+) IN HI
R2
1k
1.5V
CELL
R3
1k
3
5V RET
1
+5V SUP
R1
1k
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.
+
DMS-30LCD-1-5
REF OUT
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.
8
REF OUT
10
ANA COMM
–
12
7
REF IN
(–) IN LO
1
+5V SUP
3
6
5V RET
DP1
DATEL
UPA-5/500
120 VAC
120 VAC
DATEL
UPA-5/500
AC to DC Converter
AC to DC Converter
Figure 3. Differential Input Configuration
(5V-Powered Models)
Figure 5. Floating Input Measurements
(5V-Powered Models)
DMS-30LCD-1-9
11
(+) IN HI
+
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.
1.5V
CELL
8
REF OUT
10
ANA COMM
–
12
7
REF IN
(–) IN LO
1
50k7 < R1 + R2 < 10M7
3
6
–BAT
DP1
+
R2
+ BAT
9V
BATTERY
x VIN = Reading
R1 + R2
–
+
R1
Figure 6. Floating Input Measurements
(9V-Powered Models)
DMS-30LCD-1-5
11
(+) IN HI
8
REF OUT
VIN
R2
–
12
(–) IN LO
7
REF IN
1
+5V SUP
120 VAC
3
5V RET
DATEL
UPA-5/500
AC to DC Converter
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:
Figure 4. Input Attenuation Circuit
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30LCD.D01 Page 4 of 6
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
APPLICATIONS
R2
= 0.1
(R1 + R2 + R3)
RShunt = R1 = VFsr / I Fsr
Where:
VFsr = Full scale reading (in Volts)
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.
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
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-30LCD 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.
RShunt = 1.000V/(0.020 – 0.004)A
RShunt = 1.000V/0.016A = 62.5 Ohms
To calibrate the circuit of Figure 7, perform the following:
DMS-30LCD-1-9
1. With 4mA applied, adjust the 50k7 potentiometer (R2) to
display a reading of "000" (assuming that is the desired
reading).
11
(+) IN HI
8
REF OUT
12
(–) IN LO
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.
7
REF IN
1
+BAT
3
–BAT
R1
45.3k
R2
10.1k
R3
45.3k
5
DP2
+
9V
BATTERY
–
DMS-30LCD-1-5
8
REF OUT
(+) IN HI
Figure 8. Power Supply Monitor
(9V-Powered Models)
+
ANA COMM
4-20mA
R1
7
REF IN
(–) IN LO
1
R2
+5V SUP
3
5V RET
–
50k
120 VAC
DATEL
UPA-5/500
AC to DC Converter
7. External Gain Adjustment: Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated, operation. Use the +1.23V REFERENCE OUT (pin 9) for applications needing external gain adjustment. Figure 9 shows the wiring configuration
for each model. Calibration is performed with a precise, near-full-scale,
input voltage.
Figure 7. 4-to-20mA Current Loop Operation
(5V-Powered Models)
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-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 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:
OUT
12
VOLTAGE
CALIBRATOR
COM
DMS-30LCD
11
(+) IN HI
3
5V RET
12
(–) IN LO
10
ANA COMM
For 5V models tie
(–) IN LO to pin 3
7
REF IN
8
NC
8.45k, 1%
1k
10 to 20 Turns
For 9V models tie
(–) IN LO to pin 10
1k
10 to 20 Turns
8.45k, 1%
9
1.23V REF
Connections
for ±2V and
±20V models
Connections
for ±200mV
models
Figure 9. External Gain Adjustment
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30LCD.D01 Page 5 of 6
DMS-30LCD Series
3½ Digit, LCD Display Digital Panel Voltmeters
MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES: 2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
PIN #1
IDENTIFIER
DMS-30LCD-X-XX
RECOMMENDED PC BOARD FINISHED HOLE DIAMETER:
0.042 ±0.003 (1.067 ±0.076)
MADE IN USA
®
CALIBRATION POTENTIOMETER HOLE LOCATION
FRONT VIEW
+5V SUPPLY/ +BATTERY
DISPLAY TEST/BACKLIGHT
5V RETURN/ –BATTERY
DP3
0.260
DP2
(6.60)
DP1
PIN 1
®
LEAD DIMENSIONS: 0.025 (0.635) x 0.025 (0.635) NOMINAL
12
11
10
9
8
7
1
2
3
4
5
6
0.240
(6.10)
DP1
0.125 (3.175) DIAMETER
(USE ONLY WHEN PC BOARD MOUNTING)
DP2
0.92
(23.4)
2.17
(55.1)
0.84
(21.3)
2.09
(53.1)
(–) INPUT LO
(+) INPUT HI
ANALOG COMMON
+1.23V REFERENCE OUT
REFERENCE OUT
REFERENCE IN
DP3
0.430 (10.92) STANDARD
0.560 (14.22) BACKLIT
0.040
(1.02)
0.25 (6.4) TYP.
0.040
(1.02)
0.10
(2.5)
TYP.
0.17
(4.3)
TYP.
FRONT VIEW
#2-56 INSERT
0.156 (3.96) DEEP
0.50
(12.7)
0.187
(4.75)
0.15
(3.7)
TYP.
1.80
(45.7)
0.040
(1.02)
BEZEL INSTALLATION
PANEL
1.270
(32.26)
®
®
MADE IN USA
2.55 (64.77)
BEZEL
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
0.116
(2.95)
RETAINING CLIP INSTALLATION
1.07
(27.18)
PANEL CUTOUT
0.878
(22.30)
PANEL
2.118 (53.80)
2.35 (59.69)
0.093 (2.362) DIAMETER (4 REQUIRED)
ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY
0.096
(2.44)
USA:
Mansfield (MA), Tel: (508) 339-3000, email: [email protected]
Canada: Toronto, Tel: (866) 740-1232, email: [email protected]
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
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany: München, Tel: +49 (0)89-544334-0, email: [email protected]
www.murata-ps.com email: [email protected] ISO 9001 REGISTERED
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.
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
Website: www.murata-ps.jp
China:
Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
04/24/08
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS30LCD.D01 Page 6 of 6