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 Leads

Description: LM3914 Dot/Bar Display Driver

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.

The Pinout:

The DIP (through-hole, dual-inline package) version of this chip has 18 pins, and both a dot and notch to indicate.

Over half of the pins are in charge of driving the LEDs. The remaining pins are used for power, reference voltages, and control of the IC. Here is an overview of the chip’s pinout:

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, VCC, or even left floating. Other pins may require a resistor or two to set constant current or voltage values.

LED Outputs:

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

Mode Select:

Thepin 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,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 LM3914 Dot/Bar Display Driver-2Pcs