National Semiconductor LM3914N

LM3914 Dot/Bar Display Driver

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 wholesystem from less than 3V.

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 2mA to 30mA

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

18-pin DIP package

Applications:

Bar graph meter

Bar display with alarm flasher

20-step meter with single pot brightness control

Multi-step or "staging" controller

Combined controller and process deviation meter

Direction and rate indicator (to add to DVMs)

Exclamation point display for power saving

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