DMS30DR [MURATA]
Sunlight Readable, 3½ Digit Panel Meters with Auto-Dimming LED Displays; LED显示屏阳光下可读， 3½数字面板表具有自动调光
| 型号： | DMS30DR |
| 厂家： | 
muRata |
| 描述： | Sunlight Readable, 3½ Digit Panel Meters with Auto-Dimming LED Displays |
| 文件： | 总6页 (文件大小：201K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DMS-30DR Series
s
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
FEATURES
Murata Power Solutions’ new DMS-30DR Series are the first digital panel meters to offer LED
displays that are readable in direct sunlight—no special filters or shading devices are required.
Their Autodim circuit automatically adjusts the display’s brightness to suit viewing environments
ranging from total darkness to full, brilliant sunlight. A user-accessible brightness adjustment pin
enables custom intensity settings or display matching in multiple display applications. Washed
out, hard-to-read digital readouts are a thing of the past!
■
Super-bright LED displays are readable in
direct sunlight!
■
Autodim circuitry automatically adjusts
display brightness
■
Includes external brightness adjustment
Until now, users whose instrumentation required daylight visibility had to settle for less
reliable LCD display technology. However, in order to remain legible in low ambient light, LCDs
require complex, power-hungry backlighting circuitry. And, these displays typically suffer from
very narrow viewing angles. In contrast, DMS-30DR Series LED-based displays’ power consump-
tion drops as ambient light decreases, and their viewing angle extends to nearly 180 degrees
vertically and horizontally.
■
Large (0.56"/14.2mm) easy-to-read red
LED display
■
High reliability alternative to LCD displays
■
Ideal for automotive, industrial, and marine
All models operate from a single +5V supply, and draw as little as 7mA when operated in total
darkness—that’s less than 1/10 Watt. At maximum brightness power consumption is typically
less than 200mA (1 Watt). DMS-30DR voltmeters are available in four differential input voltage
ranges: 200mV, 2V, 20V and 200V. Input impedance is 1,000 megohms for the 200mV
and 2V inputs and 1 megohm for the 20V and 200V inputs. CMRR for all devices is 86dB,
and inputs are overvoltage protected to 250V. Each meter incorporates a precision, ultra-stable
voltage reference and is factory calibrated prior to encapsulation.
applications
■
Encapsulated package mounts in panels or
pc-boards
■
Miniature housing: 2.17˝ x 0.92" x 0.56"
(55mm x 23mm x 14mm)
■
4 differential input ranges provide 1 count
accuracy
The small size (2.17" x 0.92" x 0.56") of DMS-30DR meters is achieved by integrating their
display, Autodim display drivers, light sensor, reference circuit, and A/D converter into in a rugged
epoxy-encapsulated assembly. The device’s 12-pin, component-like, DIP package is both vibra-
tion and moisture proof, making them ideal for harsh environments. Each package incorporates a
built-in color filter and bezel, and is easily mounted in either panels or pc boards.
■
Single +5V supply; Less than 1-Watt power
consumption
■
0 to +60°C operating temperature range
1
12
+5V
+5V SUPPLY
+5V
–5V
(–) INPUT LO
(+) INPUT HI
(1)
R2
0.01ꢀF
2
R1
11
10
DC/DC
CONVERTER
EXTERNAL BRIGHTNESS
–5V
ADJUSTMENT
909k
+5V
–5V
3
A/D
CONVERTER
ANALOG
COMMON
5V RETURN
1.225V
REF.
0 Vdc
DATA
4
9
8
7
DP 3
+1.225V REFERENCE OUT
REFERENCE OUT
1.82k
5
DP 2
LIGHT
SENSOR
+5V
6
REFERENCE IN
DP 1
(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.
Figure 1. DMS-30DR Simplified Schematic
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_DMS-30DR.B04 Page 1 of 6
DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
Performance/Functional Specifications
Typical at TA = +25°C and supply voltage = +5V using the single-ended input circuit,
unless otherwise noted.
Ordering Information
DMS-30DR- 1 - R - C
PATENT PENDING
Analog Inputs
Min.
Typ.
Max.
Units
Full Scale Input Range:
DMS-30DR-0
Input Range:
0 = 200mV
1 = 2V
2 = 20V
3 = 200V
RoHS Compliant
–
–
200
2
–
–
–
–
mV
LED Color:
R = Red
DMS-30DR-1
Volts
Volts
Volts
DMS-30DR-2
–
20
DMS-30DR-3
–
200
Accessories:
DMS-EB-C
Multi-purpose (gain/offset, 4-20mA, etc.)
Input Impedence:
–
DMS-EB-RMS-C For true rms measurements of ac voltages
DMS-30-CP Panel cutout punch
DMS-30DR-0, -1
100
0.9
–
1000
1
–
–
MΩ
MΩ
Volts
Volts
dB
DMS-30DR-2, -3
A panel-mount DMS-BZL2-C is supplied with each unit.
–
250
2
Overvoltage Protection ➀
Common Mode Voltage Range
CMRR (dc to 60Hz)
–
–
–
86
–
TECHNICAL NOTES
Control Inputs ➁
Decimal Point Placement (Pins 4-6)
Ext. Bright (Pin 2)
1. External Brightness Adjustment (Pin 2): Pin 2 is internally con-
nected to the high impedance input of an operational amplifier that
amplifies the output of the DMS-30DR’s ambient light sensor (ALS)
circuit. The output of this amplifier varies the voltage that drives the
DMS-30DR’s LED display. Leave pin 2 open for standard auto-dim-
ming operation; in this mode, the ALS circuit will automatically adjust
the DMS-30DR’s LED brightness to compensate for changes in ambi-
ent lighting. As the ambient light striking the ALS increases, the LED
display’s brightness will also increase; a decrease in ambient light will
reduce the display’s brightness.
Tie to pin 3 to activate
See Technical Note 1
Performance
Sampling Rate
2.5 reading per second
Accuracy (3 minute warm-up):
DMS-30PC-0 (Vin = +0.19V)
DMS-30PC-1 (Vin = +1.9V)
DMS-30PC-2 (Vin = +19V)
DMS-30PC-3 (Vin = +190V)
Zero Reading (Vin = 0 Volts)
Temperature Drift (0 = +60°C)
+1.225V Reference Output (Pin 9)➁
Power Supply Requirements
Supply Voltage
–
1
1
3
3
Counts
Counts
Counts
Counts
–
–
2
3
The ALS circuit’s output signal can be overdriven by applying an
externally generated voltage directly to pin 2. External drivers will see
approximately 600Kohms referenced to 5V RETURN. With pin 2 at
+0.7Vdc or below, the DMS-30DR’s LED display is off, and total cur-
rent drain from a nominal +5V supply is approximately 1mA. The LED
display’s brightness will increase from minimum to maximum as the
voltage applied to pin 2 is varied from +0.8V up to +2.5V, respectively.
To enable continuous maximum display brightness, connect pin 2
directly to pin 1 (+5V SUPPLY); in this configuration the total current
drain for the meter will be approximately 200mA.
–
“–001”
–
2
3
“000”
0.2
“001”
0.4
Cnts/°C
Volts
+1.215 +1.225 +1.235
+4.75
+5.00
+5.25
Volts
Supply Current:
Full Sunlight
–
–
+150
3
+250
5
mA
mA
Total Darkness
2. Minimum-Intensity Adjustment Potentiometer: Users can adjust
the DMS-30DR’s minimum LED brightness to suit their requirements
by adjusting the ¾-turn, rear-mounted intensity adjustment poten-
tiometer. Please note, this potentiometer will have minimal impact
on display brightness in high ambient light environments. See the
Mechanical Specifications section for potentiometer locations.
Display
Display Type and Size
Polarity Indication
3½ digit, 0.56"/14.2mm high LED
Autopolarity ("–" for negative Vin)
Overrange Indication
"–1_ _ _" for negative inputs
"1_ _ _" for positive inputs
The intensity adjustment potentiometer is factory preset to its
mid-point position, producing a typical current drain of 7mA. At it’s
minimum and maximum positions, current drain is typically 3mA and
13mA, respectively. As viewed from the rear of the meter, with the
model number label facing up, turning the potentiometer clockwise
increases the display’s intensity.
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
Case Material
0
–40
0
–
–
–
+60
+75
95
°C
°C
%
Polycarbonate
3. +1.225V REFERENCE OUTPUT (Pin 9): This pin is the output of the
meter’s precision +1.225V internal reference IC. Pin 9 is referenced
to ANALOG COMMON (pin 10), which in turn sits approximately +2V
above pin 3. Pin 9 should be buffered if it’s used to drive external
loads since sourcing more than 15μA of current can affect both the
Weight
0.75 ounces (21 grams)
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 See Technical Notes.
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MPM_DMS-30DR.B04 Page 2 of 6
DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
accuracy and temperature drift of the meter. A 1% 1.82K limiting
resistor is connected between the reference IC and pin 9.
APPLICATIONS
4. ANALOG COMMON (Pin 10): This pin is connected to an internal,
low-noise, “relative” ground. Pin 10 also serves as the internal
ground for the +1.225V reference IC. ANALOG COMMON is used
in certain differential and “floating” measurements as described in
the Applications section of this data sheet, and in DMS Applica-
tion Note 3. For the vast majority of applications, pin 10 should not
be connected to pin 3 (5V RETURN), or to your system’s analog
ground.
DMS-30DR meters are highly versatile devices that can be used in
hundreds of applications. The application circuits chosen for this sec-
tion have historically received many inquiries. Every attempt has been
made to ensure technical accuracy, and all of the following circuits
have been prototyped and tested to ensure functionality. Please keep
in mind, however, that real-world applications are seldom as straight-
forward as the approaches presented here. Most applications have
many more components — and many more connections — than the
illustrations show.
5. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a preci-
sion reference actively trimmed at the factory. For normal operation,
pin 8 must be tied to pin 7 to achieve all listed accuracy and drift
specifications.
The simplified schematic shown in Figure 1 can be very useful when
debugging a malfunctioning panel meter circuit, particularly if the user
has some knowledge of operational amplifiers (op amps). The meter's
high-impedance input consists of an op amp powered from a 5Vdc
power supply (the –5V is internally generated). Knowing this, one can
easily see why input signals applied to (–) INPUT LO and (+) INPUT HI
have to be kept within the power supply rails of 5V. Also note that only
pin 11 has a current-limiting 909kΩ series resistor. High input voltages
that have a common ground with pin 3 (5V RETURN) should only be
applied to pin 11 ((+) INPUT HI) and never to pin 12. In these high-volt-
age cases, pin 12 should always be tied to pin 3 (5V RETURN).
6. 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 desired decimal point by tying the appro-
priate 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:
Applied “0”Voltage: +0.4V max
Drive Current*: 6mA max.
One of the simplified schematic's noteworthy features is that it
shows internal voltage values. It also shows that pin 3 is the meter's
zero-volt reference point — regardless of the type of power or signal
source used. This is an important point to keep in mind when a digital
or analog multimeter is used to make system measurements. The
multimeter's negative lead (usually the black one) must be connected
to pin 3 (5V RETURN).
* The driving gates must be able to sink this much current (IOL)
with a logic “0” output.
7. Gain-Adjust Potentiometer: The gain-adjust potentiometer located
on the rear of the meter has approximately 50 counts ( 2.5%)
of adjustment range with a near full-scale input. Since these
meters essentially have no zero/offset errors, a gain adjustment is
effectively an overall accuracy adjustment. Though they may be
performed at any input level except zero, accuracy adjustments are
most effective when performed with half-scale (or higher) positive
input signals.
1. Single-Ended Input Configurations: True single-ended measure-
ments can be made with any DMS-30DR meter. 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). This will ensure that large LED currents will not
flow in the wiring that connects VIN to (–) INPUT LO (pin 12). Ground-
loop currents can cause unstable readings.
If a wider adjustment range is required, an external potentiometer
circuit can be configured using the meter’s +1.225V reference
output (pin 9). The circuit shown in Figure 9 provides 10% range
of adjustment.
DMS-30DR-1
11
8
(+) IN HI
REF OUT
8. Soldering Methods: All models in the DMS-30DR Series easily
withstand most common leaded or lead-free soldering opera-
tions, performed either manually or by wave soldering machines.
However, users should evaluate the effects their particular soldering
techniques may have on the meter’s plastic case and precision
electrical performance. We highly recommend using low residue,
no-clean solders.
+
VIN
–
12
(–) IN LO
7
REF IN
1
6
3
+5V SUP
5V RET
DP1
9. Suggested Mating Connectors:
85-264Vac
Panel mounted: Connector housing P/N 4320-01069-0
Terminal type: P/N 4400-01032-0
Crimping tool: P/N 39-2099000
AC to DC Converter
Figure 2. Single-Ended Input Configuration
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: P/N 4320-01074-0
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS-30DR.B04 Page 3 of 6
DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
APPLICATIONS
2. Differential Input Configurations: Differential measurements can be
made with all DMS-30DR 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.
4. Floating Signal Source Measurements: Floating signals can be
measured using the circuits shown in Figures 5 and 6. Connecting pin
10 (ANALOG COMMON) or pin 3 (5V RETURN) 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.
R1
1k
DMS-30DR-1
11
REF OUT
8
(+) IN HI
DMS-30DR-1
11
(+) IN HI
8
R2
1k
REF IN
DP1
7
6
REF OUT
12
(–) IN LO
1.5V
CELL
12
–
R3
1k
(–) IN LO
1
3
7
+5V SUP
5V RET
REF IN
3
6
1
5V RET
DP1
+5V SUP
85-264Vac
85-264Vac
AC to DC Converter
AC to DC Converter
Figure 3. Differential Input Configuration
Figure 5. Floating Input Measurements
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.
DMS-30DR-1
11
8
(+) IN HI
REF OUT
10
ANA COMM
1.5V
CELL
–
12
7
(–) IN LO
REF IN
1
3
6
50kΩ < R1 + R2 < 10MΩ
R2
+5V SUP
5V RET
DP1
x VIN = Reading
R1 + R2
85-264Vac
+
AC to DC Converter
DMS-30DR-1
R1
R2
11
8
(+) IN HI
Figure 6. Floating Input Measurements
(Alternate Configuration)
REF OUT
VIN
12
5. Process Control (4-to-20mA) Measurements: In many common pro-
cess-control applications, a 4-to-20mA current loop is used to transmit
information. Because DMS-30DR meters have such high input imped-
ance, 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:
(–) IN LO
–
7
REF IN
1
3
+5V SUP
5V RET
85-264Vac
R
Shunt = R1 = VFsr /IFsr
Figure 4. Input Attenuation Circuit
Where:
VFsr = Full scale reading (in Volts)
I
Fsr = Relative full scale current (in Amps)
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MPM_DMS-30DR.B04 Page 4 of 6
DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
APPLICATIONS
Example: For a meter with a 2V full scale input (1.999 full
scale reading) and a desired display reading of
"1000" (with an input of 20mA), VFsr = 1.000 Volts
represents a basic ammeter connection diagram. A detailed application
note describing digital dc ammeters is available at www.cd4power.com.
R
R
Shunt = 1.000V/(0.020 – 0.004)A
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To calibrate the circuit of Figure 7, perform the following:
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display a reading of "000" (assuming that is the desired
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the back of the meter to display a reading of "1000". For
different full scale readings, alter the value of RShunt accordingly.
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11
(+) IN HI
8
REF OUT
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Figure 8. Basic DC Ammeter Circuit
10
ANA COMM
12
7
7. External Gain Adjustment: Connect REFERENCE OUT
(pin 8) to REFERENCE IN (pin 7) for normal, factory calibrated,
operation. Use the +1.225V REFERENCE OUT (pin 9) for applica-
tions needing external gain adjustment. Figure 10 shows the wiring
configuration for each model. Calibration is performed with a precise,
near-full-scale, input voltage.
4-20mA
R1
(–) IN LO
REF IN
9
1
3
1.225V
REF
5V SUP
5V RET
R2
–
50k
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6. Digital Ammeter: Digital ammeters are finding ever-increasing usage
because analog-style ammeters (moving-vane types) now cost roughly
the same as their digital counterparts. Additionally, analog ammeters
are not nearly as rugged as modern digital panel voltmeters. Figure 9
illustrates a typical ammeter application. The circuit uses a 200mV
input meter — the preferred range for most ammeters — to measure
the voltage developed across a 0.1Ω current shunt. The circuit shown
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS-30DR.B04 Page 5 of 6
DMS-30DR Series
Sunlight Readable, 3½ Digit Panel Meters
with Auto-Dimming LED Displays
MECHANICAL SPECIFICATIONS
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MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES: 2 PL DEC 0.02 ( 0.51)
3 PL DEC 0.010 ( 0.254)
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USA:
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
Canada:
UK:
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
04/07/09
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
France:
Germany:
Japan:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
München, 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
China:
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
notice.
© 2009 Murata Power Solutions, Inc.
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_DMS-30DR.B04 Page 6 of 6
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