DMS-20LCD-2-9 Murata Power Solutions Inc, DMS-20LCD-2-9 Datasheet

DMS-20LCD-2-9

Manufacturer Part Number

DMS-20LCD-2-9

Description

DATEL PANEL METERS

Manufacturer

Murata Power Solutions Inc

Type

Digital Panel Voltmetersr

Datasheet

1.DMS-20LCD-0-9-C.pdf (6 pages)

Specifications of DMS-20LCD-2-9

Rohs Compliant

Equipment Type

Digital Panel Voltmeters

Input

+/- 20 V

Display Type

3 - 1/2 Digit LCD

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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FEATURES

■

www.murata-ps.com

SIMPLIFIED SCHEMATIC DIAGRAM

Lowest cost

Lowest power, 2mW

Subminiature size:

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 +60°C temperature range

1.38" x 0.88" x 0.43"

35mm x 22mm x 11mm

www.murata-ps.com/rohs

For full details go to

+5V SUPPLY/

5V RETURN/

+BATTERY

–BATTERY

DP 3

DP 2

DP 1

N.C.

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.

0 Vdc

CONVERTER

DC/DC

www.murata-ps.com/dpm

+5V

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.

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.

±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).

+9V supply/battery (drawing 230μA). All models have a low-battery ("B") annunciator and

feature autopolarity changeover and overrange indication.

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.

DATA

DMS-20LCD Series, 3½ Digit, LCD Display, Digital Voltmeters represent the ultimate

Incorporating a precision reference and a factory-calibrated, autozeroing A/D converter,

DMS-20LCD meters have 4 differential input voltage ranges (±200mV, ±2V, ±20V and

All DMS-20LCD meters operate from a single +5V supply (drawing 400μA) or a single

Also available is an application/evaluation board (DMS-EB2) that plugs directly onto the

–5V

CONVERTER

A/D

V+

V–

3½ Digit, LCD Display Digital Panel Voltmeters

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

J1 is connected.

Used on backlit models only.

N.C. for non-backlit models.

+5V

0.01μF

≈+2.0V

DMS-20LCD Series

05 Apr 2011 MPM_DMS20LCD.B08 Page 1 of 6

909k

ANALOG

COMMON

REFERENCE OUT

REFERENCE IN

(–) INPUT LO

(+) INPUT HI

N.C./BACKLIGHT

email: sales@murata-ps.com

Related parts for DMS-20LCD-2-9

DMS-20LCD-2-9 Summary of contents

Page 1

... 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 400μ single +9V supply/battery (drawing 230μA). All models have a low-battery ("B") annunciator and feature autopolarity changeover and overrange indication. ...

Page 2

... 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 pin 3 (5V RETURN/–BATTERY). Unused decimal email: sales@murata-ps.com 05 Apr 2011 MPM_DMS20LCD.B08 Page – +60 °C – ...

Page 3

... 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 recom- mend, however, that you evaluate the effects your particular soldering techniques may have on the meter’ ...

Page 4

... Figure 6. Floating Input Measurements (9V-Powered Models) 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 ...

Page 5

... 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-20LCD 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. ...

Page 6

... TYP. 0.040 (1.02) 0.50 (12.7) BEZEL INSTALLATION PANEL BEZEL RETAINING CLIP INSTALLATION email: sales@murata-ps.com 05 Apr 2011 MPM_DMS20LCD.B08 Page (–) INPUT LO 11 (+) INPUT HI 10 ANALOG COMMON 9 N.C./BACKLIGHT 8 REFERENCE OUT 7 REFERENCE IN 0.425 (10.80) 0.25 (6.4) TYP. ...

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