LM3914
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SNVS761B –JANUARY 2000–REVISED MARCH 2013
LM3914 Dot/Bar Display Driver
Check for Samples: LM3914
Versatility was designed into the LM3914 so that
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FEATURES
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
segments. Both ends of the voltage divider are
externally available so that 2 drivers can be made
into a zero-center meter.
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Drives LEDs, LCDs or Vacuum Fluorescents
Bar or Dot Display Mode Externally Selectable
by User
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Expandable to Displays of 100 Steps
Internal Voltage Reference from 1.2V to 12V
Operates with Single Supply of Less than 3V
Inputs Operate Down to Ground
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.
Output Current Programmable from 2 mA to 30
mA
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No Multiplex Switching or Interaction Between
Outputs
Input Withstands ±35V without Damage or
False Outputs
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.
LED Driver Outputs are Current Regulated,
Open-collectors
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Outputs can Interface with TTL or CMOS Logic
The Internal 10-step Divider is Floating and
can be Referenced to a Wide Range of
Voltages
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 individual outputs can drive a transistor
as well as a LED at the same time, so controller
functions including “staging” control can be
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 resistors.
This feature is one that allows operation of the whole
system from less than 3V.
performed. The LM3914 can also act as
programmer, or sequencer.
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The LM3914 is rated for operation from 0°C to +70°C.
The LM3914N-1 is available in an 18-lead PDIP
(NFK) package.
The following typical application illustrates adjusting
of the reference to a desired value, and proper
grounding for accurate operation, and avoiding
oscillations.
The circuit contains its own adjustable reference and
accurate 10-step voltage divider. The low-bias-current
input buffer accepts signals down to ground, or V−,
yet needs no 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
½%, even over a wide temperature range.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2013, Texas Instruments Incorporated
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