LM3914 LM3914N 3914 IC LED Driver LED Lighting Drivers Dot Display 3V To 15V Input 10 Outputs DIP-18 18 Pin Leads Dual In Line Package Chip

Description: LM3914N LM3914 3914 IC LED Driver LED Lighting Drivers 

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.

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.

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 segments. Both ends of the voltage divider are externally available 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.

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 performed. The LM3914 can also act as a programmer, or sequencer.

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.

Features:-

• Drives LEDs, LCDs or Vacuum Fluorescents
• Bar or Dot Display Mode Externally Selectable by User
• 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
• Output Current Programmable from 2 mA to 30 mA
• No Multiplex Switching or Interaction Between Outputs
• Input Withstands ±35V without Damage or False Outputs
• LED Driver Outputs are Current Regulated, Open-collectors
• 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

Specifications:

That may seem a daunting list of pins and reference voltages to supply, but in reality it can be very simple. Many of those pins can either be tied to ground, V_CC, or even left floating. Other pins may require a resistor or two to set constant current or voltage values.

Features:

• Drives LEDs, LCDs or Vacuum Fluorescents
• Bar or Dot Display Mode Externally Selectable by User
• 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
• Output Current Programmable from 2 mA to 30 mA
• No Multiplex Switching or Interaction Between Outputs
• Input Withstands ±35V without Damage or False Outputs
• LED Driver Outputs are Current Regulated, Open-collectors
• 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

LED Outputs:

• The LED outputs are all open-collectors, so they sink current. Connect the cathode of an LED to these pins and tie the other pin of the LED – the anode – to your voltage supply. There is no need for current limiting resistors, as the chip takes care of current regulation.

Mode Select:

• The Mode pin allows you to select between “bar” mode and “dot” mode. In bar mode, all LEDs sequentially turn on. So, if the signal voltage is near max, all LEDs should be on. In “dot” mode just a single LED is on at any time. Connect mode directly to the power source for bar mode, and leave it floating for dot mode.
• Mode Mode Pin Setting Bar Graph Tied directly to V⁺ Dot Display Left floating (no connection) Dot Display (cascaded drivers)Mode pin of first driver connected to pin 1 of next

Package Include:

• 1 x LM3914N LM3914 3914 IC LED Driver LED Lighting Drivers Dot or Bar Display 3V To 15V Input 10 Outputs DIP 18 Pin IC Electronics Components