DMS-30DR Series
www.murata-ps.com
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
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