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 A 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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