LM3914N-1/NOPB National Semiconductor, LM3914N-1/NOPB Datasheet

IC DRIVER DOT BAR DISPLAY 18-DIP

LM3914N-1/NOPB

Manufacturer Part Number
LM3914N-1/NOPB
Description
IC DRIVER DOT BAR DISPLAY 18-DIP
Manufacturer
National Semiconductor
Datasheet

Specifications of LM3914N-1/NOPB

Display Type
LED, LCD, Vacuum Fluorescent
Configuration
Dot/Bar Display
Digits Or Characters
10 Steps
Current - Supply
6.1mA
Voltage - Supply
3 V ~ 20 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
18-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Interface
-
Lead Free Status / Rohs Status
RoHS Compliant part Electrostatic Device
Other names
*LM3914N-1
LM3914N-1

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© 2004 National Semiconductor Corporation
LM3914
Dot/Bar Display Driver
General Description
The LM3914 is a monolithic integrated circuit that senses
analog voltage levels and drives 10 LEDs, providing a linear
analog display. A single pin changes the display from a
moving dot to a bar graph. Current drive to the LEDs is
regulated and programmable, eliminating the need for resis-
tors. This feature is one that allows operation of the whole
system from less than 3V.
The circuit contains its own adjustable reference and accu-
rate 10-step voltage divider. The low-bias-current input
buffer accepts signals down to ground, or V
protection against inputs of 35V above or below ground. The
buffer drives 10 individual comparators referenced to the
precision divider. Indication non-linearity can thus be held
typically to
Versatility was designed into the LM3914 so that controller,
visual alarm, and expanded scale functions are easily added
on to the display system. The circuit can drive LEDs of many
colors, or low-current incandescent lamps. Many LM3914s
can be “chained” to form displays of 20 to over 100 seg-
ments. Both ends of the voltage divider are externally avail-
able so that 2 drivers can be made into a zero-center meter.
The LM3914 is very easy to apply as an analog meter circuit.
A 1.2V full-scale meter requires only 1 resistor and a single
3V to 15V supply in addition to the 10 display LEDs. If the 1
resistor is a pot, it becomes the LED brightness control. The
simplified block diagram illustrates this extremely simple
external circuitry.
When in the dot mode, there is a small amount of overlap or
“fade” (about 1 mV) between segments. This assures that at
no time will all LEDs be “OFF”, and thus any ambiguous
display is avoided. Various novel displays are possible.
1
2
%, even over a wide temperature range.
DS007970
, yet needs no
Much of the display flexibility derives from the fact that all
outputs are individual, DC regulated currents. Various effects
can be achieved by modulating these currents. The indi-
vidual outputs can drive a transistor as well as a LED at the
same time, so controller functions including “staging” control
can be performed. The LM3914 can also act as a program-
mer, or sequencer.
The LM3914 is rated for operation from 0˚C to +70˚C. The
LM3914N-1 is available in an 18-lead molded (N) package.
The following typical application illustrates adjusting of the
reference to a desired value, and proper grounding for ac-
curate operation, and avoiding oscillations.
Features
n Drives LEDs, LCDs or vacuum fluorescents
n Bar or dot display mode externally selectable by user
n Expandable to displays of 100 steps
n Internal voltage reference from 1.2V to 12V
n Operates with single supply of less than 3V
n Inputs operate down to ground
n Output current programmable from 2 mA to 30 mA
n No multiplex switching or interaction between outputs
n Input withstands
n LED driver outputs are current regulated,
n Outputs can interface with TTL or CMOS logic
n The internal 10-step divider is floating and can be
open-collectors
referenced to a wide range of voltages
±
35V without damage or false outputs
February 2003
www.national.com

Related parts for LM3914N-1/NOPB

LM3914N-1/NOPB Summary of contents

Page 1

... The LM3914 can also act as a program- mer, or sequencer. The LM3914 is rated for operation from 0˚C to +70˚C. The LM3914N-1 is available in an 18-lead molded (N) package. The following typical application illustrates adjusting of the reference to a desired value, and proper grounding for ac- − ...

Page 2

Typical Applications Note: Grounding method is typical of all uses. The 2.2µF tantalum or 10 µF aluminum electrolytic capacitor is needed if leads to the LED supply are 6" or longer. www.national.com Bar Graph Meter 2 00797001 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Dissipation (Note 6) Molded DIP (N) Supply Voltage Voltage on Output Drivers Input Signal Overvoltage (Note 4) Divider Voltage Reference Load Current Electrical Characteristics ...

Page 4

Electrical Characteristics Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC ...

Page 5

Typical Performance Characteristics Supply Current vs Temperature Reference Voltage vs Temperature LED Current-Regulation Dropout Operating Input Bias Current vs Temperature 00797002 Reference Adjust Pin Current vs Temperature 00797021 LED Driver Saturation 00797023 5 00797020 00797022 Voltage 00797024 www.national.com ...

Page 6

Typical Performance Characteristics Input Current Beyond Signal Range (Pin 5) LED Driver Current Regulation Common-Mode Limits www.national.com (Continued) LED Current vs Reference Loading 00797025 Total Divider Resistance vs Temperature 00797027 Output Characteristics 00797029 6 00797026 00797028 00797030 ...

Page 7

Block Diagram (Showing Simplest Application) 7 00797003 www.national.com ...

Page 8

Functional Description The simplifed LM3914 block diagram is to give the general idea of the circuit’s operation. A high input impedance buffer operates with signals from ground to 12V, and is protected against reverse and overvoltage signals. The signal is ...

Page 9

Mode Pin Functional Description (Continued) DOT MODE CARRY In order for the display to make sense when multiple LM3914s are cascaded in dot mode, special circuitry has been included to shut off LED No the first device when ...

Page 10

Typical Applications www.national.com Zero-Center Meter, 20-Segment 10 00797007 ...

Page 11

Typical Applications (Continued) *This application illustrates that the LED supply needs practically no filtering Calibration: With a precision meter between pins 4 and 6 adjust R1 for voltage V The adjustments are non-interacting. Expanded Scale Meter, Dot or Bar of ...

Page 12

Typical Applications LEDs light up as illustrated with the upper lit LED indicating the actual input voltage. The display appears to increase resolution and provides an analog indication of overrange. Indicator and Alarm, Full-Scale Changes Display from Dot to Bar ...

Page 13

Typical Applications (Continued) Full-scale causes the full bar display to flash. If the junction of R1 and C1 is connected to a different LED cathode, the display will flash when that LED lights, and at any higher input signal. Adding ...

Page 14

Typical Applications Operating with a High Voltage Supply (Dot Mode Only) The LED currents are approximately 10mA, and the LM3914 outputs operate in saturation for minimum dissipation. *This point is partially regulated and decreases in voltage with temperature. Voltage requirements ...

Page 15

Typical Applications (Continued) *The exact wiring arrangement of this schematic shows the need for Mode Select (pin 9) to sense the V Programs LEDs to 10mA Application Hints Three of the most commonly needed precautions for using the LM3914 are ...

Page 16

Application Hints (Continued) APPLICATION TIPS FOR THE LM3914 ADJUSTABLE REFERENCE Greatly Expanded Scale (Bar Mode Only) Placing the LM3914 internal resistor divider in parallel with a section (.230Ω stable, low resistance divider greatly reduces voltage changes due to ...

Page 17

Application Hints (Continued) Non-Interacting Adjustments for Expanded Scale Meter (4.5V to 5V, Bar or Dot Mode) Adjusting Linearity of Several Stacked Dividers Other Applications • “Slow” — fade bar or dot display (doubles resolution) • 20-step meter with single pot ...

Page 18

... Connection Diagrams www.national.com Plastic Chip Carrier Package Top View Order Number LM3914V See NS Package Number V20A Dual-in-Line Package Top View Order Number LM3914N-1 See NS Package Number NA18A Order Number LM3914N * See NS Package Number N18A * Discontinued, Life Time Buy date 12/20/99 18 00797018 00797019 ...

Page 19

LM3914 MDC MWC Dot/Bar Display Driver Die/Wafer Characteristics Fabrication Attributes Physical Die Identification Die Step Physical Attributes Wafer Diameter Dise Size (Drawn) Thickness Min Pitch Special Assembly Requirements: Note: Actual die size is rounded to the nearest micron. (Referenced to ...

Page 20

Die/Wafer Characteristics LED NO.5 18 LED NO.4 19 LED NO.3 20 LED NO U.S.A Tel #: Fax: IN EUROPE Tel: Fax: IN ASIA PACIFIC Tel: IN JAPAN Tel: www.national.com (Continued) -320 1154 105 -526 1154 105 -1086 1086 ...

Page 21

... Standard Lead Finish: 200 microinches /5.08 micrometer minimum lead/tin 37/63 or 15/85 on alloy 42 or equivalent or copper 2. Reference JEDEC registration MS-001, Variation AC, dated May 1993. Dual-In-Line Package (N) Order Number LM3914N-1 NS Package Number NA18A Plastic Chip Carrier Package (V) Order Number LM3914V NS Package Number V20A 21 www ...

Page 22

... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 Dual-In-Line Package (N) Order Number LM3914N * NS Package Number N18A * Discontinued, Life Time Buy date 12/20/ critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

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