The LM is rated for operation from 0°C to +70°C. Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. The LM is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing LM Dot/Bar Display Driver datasheet (Rev. LM 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.
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Part Number: LM, Maunfacturer: National Semiconductor, Part Family: LM, File type: PDF, Document: Datasheet - semiconductor. Dot/Bar Display Driver, LM datasheet, LM circuit, LM data sheet: NSC, alldatasheet, datasheet, Datasheet search site for Electronic Components. LM Dot/Bar Display Driver. General Description. The LM is a monolithic integrated The LM is very easy to apply as an analog meter circuit.
The LM can also act as a program- regulated and programmable, eliminating the need for resis- mer, or sequencer. This feature is one that allows operation of the whole The LM is rated for operation from 0?
The system from less than 3V. LMN-1 is available in an lead molded N package.
The circuit contains its own adjustable reference and accu- The following typical application illustrates adjusting of the rate step voltage divider. The low-bias-current input reference to a desired value, and proper grounding for ac- buffer accepts signals down to ground, or V-, yet needs no curate operation, and avoiding oscillations. The buffer drives 10 individual comparators referenced to the Features precision divider.
Drives LEDs, LCDs or vacuum fluorescents n Bar or dot display mode externally selectable by user Versatility was designed into the LM so that controller, n visual alarm, and expanded scale functions are easily added Expandable to displays of steps n on to the display system.
The circuit can drive LEDs of many Internal voltage reference from 1. Many LMs Operates with single supply of less than 3V n can be "chained" to form displays of 20 to over seg- Inputs operate down to ground n ments.
Continue connecting pin 9 of lower input drivers to pin 1 of higher input drivers for 30, 40, or more LED displays. The last LM driver in the chain will have pin 9 wired to pin All previous drivers should have a 20k resistor in parallel with LED No.
Refer to the simplified block diagram below. The chip is in bar mode when pin 9 is above this level; otherwise it's in dot mode. The comparator is designed so that pin 9 can be left open circuit for dot mode. In bar mode, pin 9 should be connected directly to pin 3.
Large currents drawn from the power supply LED current, for example should not share this path so that large IR drops are avoided. The connection for cascading in dot mode has already been described and is depicted below.
Pin 9 of LM No. As soon as the input voltage reaches the threshold of LED No. VLED is sensed via the 20k resistor connected to pin This ensures that pin 9 of LM No.
While A does not normally produce significant LED illumination, it may be noticeable when using high-efficiency LEDs in a dark environment.Soldering Information. A further "How can I? This approach worked when I built the circuit.
If an expanded scale meter display is desired, the total divider voltage can be as little as mV. Drives LEDs, LCDs or vacuum fluorescents n Bar or dot display mode externally selectable by user Versatility was designed into the LM so that controller, n visual alarm, and expanded scale functions are easily added Expandable to displays of steps n on to the display system.
The circuit contains its own adjustable reference and accu- rate step voltage divider.
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