DMS-30DR Series www.murata-ps.com Sunlight Readable, 3 Digit Panel Meters with Auto-Dimming LED Displays FEATURES Murata Power Solutions new DMS-30DR Series are the rst digital panel meters to offer LED Super-bright LED displays are readable in direct displays that are readable in direct sunlightno special lters or shading devices are required. sunlight Their Autodim circuit automatically adjusts the displays brightness to suit viewing environments Autodim circuitry automatically adjusts display ranging from total darkness to full, brilliant sunlight. A user-accessible brightness adjustment pin brightness enables custom intensity settings or display matching in multiple display applications. Washed out, hard-to-read digital readouts are a thing of the past Includes external brightness adjustment Until now, users whose instrumentation required daylight visibility had to settle for less Large (0.56 /14.2mm) easy-to-read red LED display reliable LCD display technology. However, in order to remain legible in low ambient light, LCDs High reliability alternative to LCD displays require complex, power-hungry backlighting circuitry. And, these displays typically suffer from Ideal for automotive, industrial, and marine applications 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 Encapsulated package mounts in panels or pc-boards vertically and horizontally. Miniature housing: 2.17 x 0.92 x 0.56 All models operate from a single +5V supply, and draw as little as 7mA when operated in total (55mm x 23mm x 14mm) darknessthats less than 1/10 Watt. At maximum brightness power consumption is typically 4 differential input ranges provide 1 count accuracy less than 200mA (1 Watt). DMS-30DR voltmeters are available in four differential input voltage Single +5V supply Less than 1-Watt power consumption 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, 0 to +60C operating temperature range 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 devices 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 lter and bezel, and is easily mounted in either panels or pc boards. 1 12 +5V SUPPLY +5V +5V () INPUT LO (1) R2 0.01 F 2 R1 11 DC/DC EXTERNAL BRIGHTNESS 5V 5V (+) INPUT HI CONVERTER ADJUSTMENT 909k +5V 3 10 A/D ANALOG 5V RETURN CONVERTER COMMON 5V 1.225V 0 Vdc REF. DATA 4 9 DP 3 +1.225V REFERENCE OUT 1.82k 5 8 DP 2 REFERENCE OUT LIGHT +5V SENSOR 7 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 Simpli ed Schematic For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM DMS-30DR.C02 Page 1 of 6DMS-30DR Series Sunlight Readable, 3 Digit Panel Meters with Auto-Dimming LED Displays Performance/Functional Speci cations Typical at TA = +25C and supply voltage = +5V using the single-ended input circuit, Ordering Information unless otherwise noted. DMS-30DR- 1 - R - C Analog Inputs Min. Typ. Max. Units Full Scale Input Range: Input Range: RoHS DMS-30DR-0 200 mV 0 = 200mV 1 = 2V LED Color: DMS-30DR-1 2 Volts 2 = 20V R = Red DMS-30DR-2 20 Volts 3 = 200V DMS-30DR-3 200 Volts Accessories: DMS-EB-C Multi-purpose (gain/offset, 4-20mA, etc.) Input Impedance: DMS-EB-RMS-C For true rms measurements of ac voltages DMS-30DR-0, -1 100 1000 M DMS-30-CP Panel cutout punch DMS-30DR-2, -3 0.9 1 M A panel-mount DMS-BZL2-C is supplied with each unit. Overvoltage Protection 250 Volts See www.murata-ps.com/dpm-availability for model-speci c availability. Common Mode Voltage Range 2 Volts CMRR (dc to 60Hz) 86 dB TECHNICAL NOTES Control Inputs 1. External Brightness Adjustment (Pin 2): Pin 2 is internally con- Decimal Point Placement (Pins 4-6) Tie to pin 3 to activate nected to the high impedance input of an operational ampli er that ampli es the output of the DMS-30DRs ambient light sensor (ALS) Ext. Bright (Pin 2) See Technical Note 1 circuit. The output of this ampli er varies the voltage that drives the Performance DMS-30DRs LED display. Leave pin 2 open for standard auto-dim- Sampling Rate 2.5 reading per second ming operation in this mode, the ALS circuit will automatically adjust Accuracy (3 minute warm-up): the DMS-30DRs LED brightness to compensate for changes in ambi- ent lighting. As the ambient light striking the ALS increases, the LED DMS-30PC-0 (Vin = +0.19V) 1 3 Counts displays brightness will also increase a decrease in ambient light will DMS-30PC-1 (Vin = +1.9V) 1 3 Counts reduce the displays brightness. DMS-30PC-2 (Vin = +19V) 2 3 Counts The ALS circuits output signal can be overdriven by applying an DMS-30PC-3 (Vin = +190V) 2 3 Counts externally generated voltage directly to pin 2. External drivers will see Zero Reading (Vin = 0 Volts) 001 000 001 approximately 600Kohms referenced to 5V RETURN. With pin 2 at Temperature Drift (0 = +60C) 0.2 0.4 Cnts/C +0.7Vdc or below, the DMS-30DRs LED display is off, and total cur- +1.215 +1.225 +1.235 Volts rent drain from a nominal +5V supply is approximately 1mA. The LED +1.225V Reference Output (Pin 9) displays brightness will increase from minimum to maximum as the Power Supply Requirements voltage applied to pin 2 is varied from +0.8V up to +2.5V, respectively. Supply Voltage +4.75 +5.00 +5.25 Volts To enable continuous maximum display brightness, connect pin 2 Supply Current: directly to pin 1 (+5V SUPPLY) in this con guration the total current Full Sunlight +150 +250 mA drain for the meter will be approximately 200mA. Total Darkness 3 5 mA 2. Minimum-Intensity Adjustment Potentiometer: Users can adjust Display the DMS-30DRs minimum LED brightness to suit their requirements by adjusting the -turn, rear-mounted intensity adjustment poten- Display Type and Size 3 digit, 0.56 /14.2mm high LED tiometer. Please note, this potentiometer will have minimal impact Polarity Indication Autopolarity for negative Vin) on display brightness in high ambient light environments. See the Overrange Indication1 for negative inputs Mechanical Speci cations section for potentiometer locations.1 for positive inputs The intensity adjustment potentiometer is factory preset to its Physical/Environmental mid-point position, producing a typical current drain of 7mA. At its Operating Temperature 0 +60 C minimum and maximum positions, current drain is typically 3mA and Storage Temperature 40 +75 C 13mA, respectively. As viewed from the rear of the meter, with the model number label facing up, turning the potentiometer clockwise Humidity (non-condensing) 0 95 % increases the displays intensity. Case Material Polycarbonate 3. +1.225V REFERENCE OUTPUT (Pin 9): This pin is the output of the Weight 0.75 ounces (21 grams) meters precision +1.225V internal reference IC. Pin 9 is referenced Applies for transient or continuous overvoltages applied to (+) INPUT HI (pin 11) with to ANALOG COMMON (pin 10), which in turn sits approximately +2V () INPUT LO (pin 12) properly connected. Pin 12 is not overvoltage protected above pin 3. Pin 9 should be buffered if its used to drive external (see Figure 1). Voltages applied to pin 12 should not exceed the supply voltage. See Technical Notes. loads since sourcing more than 15A of current can affect both the www.murata-ps.com/support MPM DMS-30DR.C02 Page 2 of 6