DMS30DR MURATA | Alldatasheet
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Technical content
Ḥ Figure 1. DMS-30DR Simplifi ed SchematicFor full details go to R2 is not used on ±200mV (-0) models or ±2V (-1) models.
0 Vdc
FEATURES
■ Super-bright LED displays are readable in direct sunlight! ■ Autodim circuitry automatically adjusts display brightness ■ Includes external brightness adjustment ■ Large (0.56"/14.2mm) easy-to-read red LED display ■ High reliability alternative to LCD displays ■ Ideal for automotive, industrial, and marine
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 ■ Single +5V supply; Less than 1-Watt power consumption ■ 0 to +60°C operating temperature range Murata Power Solutions’ new DMS-30DR Series are the fi rst digital panel meters to offer LED displays that are readable in direct sunlight—no special fi lters 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! 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. 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. 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 fi lter and bezel, and is easily mounted in either panels or pc boards.
Performance/Functional Specifi cations Typical at TA = +25°C and supply voltage = +5V using the single-ended 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 See Technical Notes. Analog Inputs Min. Typ. Max. Units Full Scale Input Range: DMS-30DR-0 – ±200 – mV DMS-30DR-1 – ±2 – Volts DMS-30DR-2 – ±20 – Volts DMS-30DR-3 – ±200 – Volts Input Impedence: – DMS-30DR-0, -1 100 1000 – MΩ DMS-30DR-2, -3 0.9 1 – MΩ Overvoltage Protection ➀ – – ±250 Volts Common Mode Voltage Range – – ±2 Volts CMRR (dc to 60Hz) – 86 – dB Control Inputs ➁ Decimal Point Placement (Pins 4-6) Tie to pin 3 to activate Ext. Bright (Pin 2) See Technical Note 1 Performance Sampling Rate 2.5 reading per second Accuracy (3 minute warm-up): DMS-30PC-0 (Vin = +0.19V) – ±1 ±3 Counts DMS-30PC-1 (Vin = +1.9V) – ±1 ±3 Counts DMS-30PC-2 (Vin = +19V) – ±2 ±3 Counts DMS-30PC-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 +1.225V Reference Output (Pin 9)➁ +1.215 +1.225 +1.235 Volts Power Supply Requirements Supply Voltage +4.75 +5.00 +5.25 Volts Supply Current: Full Sunlight – +150 +250 mA Total Darkness –35 m A Display Display Type and Size 3½ digit, 0.56"/14.2mm high LED Polarity Indication Autopolarity ("–" for negative Vin) Overrange Indication "–1_ _ _" for negative inputs "1_ _ _" for positive inputs Physical/Environmental Operating Temperature 0 – +60 °C Storage Temperature –40 – +75 °C Humidity (non-condensing) 0– 9 5 % Case Material Polycarbonate Weight 0.75 ounces (21 grams)
Ordering Information
LED Color: R = Red Accessories: DMS-EB-C Multi-purpose (gain/offset, 4-20mA, etc.) DMS-EB-RMS-C For true rms measurements of ac voltages DMS-30-CP Panel cutout punch Input Range: 0 = ±200mV 1 = ±2V 2 = ±20V 3 = ±200V A panel-mount DMS-BZL2-C is supplied with each unit. PATENT PENDING RoHS Compliant Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com DMS-30DR Series Sunlight Readable, 3½ Digit Panel Meters with Auto-Dimming LED Displays MPM_DMS-30DR.B04 Page 2 of 6 TECHNICAL NOTES 1. External Brightness Adjustment (Pin 2): Pin 2 is internally con- nected to the high impedance input of an operational amplifi er that amplifi es the output of the DMS-30DR’s ambient light sensor (ALS) circuit. The output of this amplifi er 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. 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 SUPPL Y); in this confi guration the total current drain for the meter will be approximately 200mA. 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 Specifi cations section for potentiometer locations. 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. 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
- Single-Ended Input Confi gurations: 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 fl ow in the wiring that connects V IN to (–) INPUT LO (pin 12). Ground- loop currents can cause unstable readings.
Figure 2. Single-Ended Input Confi guration age cases, pin 12 should always be tied to pin 3 (5V RETURN). accuracy and temperature drift of the meter. A ±1% 1.82K limiting resistor is connected between the reference IC and pin 9. 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 “fl oating” 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. 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 specifi cations. 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. * 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. If a wider adjustment range is required, an external potentiometer circuit can be confi gured using the meter’s +1.225V reference output (pin 9). The circuit shown in Figure 9 provides ±10% range of adjustment. 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. 9. Suggested Mating Connectors: Panel mounted: Connector housing P/N 4320-01069-0 Terminal type: P/N 4400-01032-0 Crimping tool: P/N 39-2099000 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
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: $-3 880). )$%.4)&)%2 &2/.46)%7 63500,9 %84"2)'(4.%33 62%452. n ).054,/ ).054() !.!,/'#/--/. 62%&%2%.#%/54 2%&%2%.#%/54 2%&%2%.#%). $0 $0 $0 490 490 490 490 0). ).4%.3)49 $)!-%4%2 ).3%24 $%%0 &2/.46)%7 $-3 ":, $)!-%4%22%15)2%$ -!8 0!.%,#54/54 "%:%,).34!,,!4)/. "%:%, '!3+%4 0!.%, Front View 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 notice. © 2009 Murata Power Solutions, Inc. USA: Mansfi eld (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Japan: 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 Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, 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 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com 04/07/09 DMS-30DR Series Sunlight Readable, 3½ Digit Panel Meters with Auto-Dimming LED Displays MPM_DMS-30DR.B04 Page 6 of 6 BEZEL INSTALLATION AND RECOMMENDED DRILL AND PANEL CUTOUT MECHANICAL SPECIFICATIONS