LM3914 - Dot/Bar Display Driver

This is the LM3914 Dot/Bar display analog-controlled LED driver that uses an alinear output scale. With this driver all it takes is a single, analog signal to drive a string of 10+ LEDs, which can be configured into either bar mode (where all LEDs below a certain point turn on) or dot mode (with only a single LED on at a time). Hook them up properly, and you can create all sorts of nifty multi-LED displays.

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.

Feature:

• Provides a Linear Analog Display from Analog Voltage Input
• 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 voltage

Datasheet:

https://www.ti.com/lit/ds/symlink/lm3914.pdf