LM3914 - Dot/Bar Display Driver [Original]

LM3914 Dot/Bar Display Driver IC for Linear Analog LED Displays

The LM3914 is a highly versatile monolithic integrated circuit, specifically engineered for intuitive analog display applications. It precisely senses varying analog voltage levels and efficiently drives up to 10 LEDs, creating a clear and dynamic linear analog visual output. A standout feature is its single-pin control, allowing users to effortlessly toggle between a classic bar graph and a distinct moving dot display mode. The integrated LED current drive is fully regulated and programmable, eliminating the need for external current-limiting resistors and simplifying circuit design. This intelligent power management enables the entire system to operate reliably from supply voltages as low as 3V, making it perfect for portable and battery-sensitive projects. For larger scale visual feedback, the LM3914's architecture supports easy expansion to displays with up to 100 steps. Its robust inputs can withstand ±35V, and outputs are compatible with both TTL and CMOS logic, ensuring broad compatibility and ease of integration. The LM3914 offers a compact, efficient, and reliable solution for adding visual feedback to a wide array of electronic designs.

Specifications:

• IC Type: Monolithic Integrated Circuit
• Display Type: Linear Analog (Dot/Bar)
• LEDs Driven: 10
• Minimum Supply Voltage: < 3V
• Output Current (Programmable): 2 mA to 30 mA
• Internal Voltage Reference: 1.2V to 12V
• Input Voltage Withstand: ±35V
• Output Type: Current regulated, open-collector
• Logic Compatibility: TTL/CMOS

Key features and benefits:

• Provides a linear analog display from analog voltage input
• Drives 10 LEDs directly; compatible with LCDs/VFDs via external circuitry
• User-selectable bar or dot display mode with a single control pin
• Expandable to create displays of up to 100 steps
• Internal voltage reference adjustable from 1.2V to 12V
• Operates efficiently with a single supply voltage as low as 3V
• Programmable LED output current from 2 mA to 30 mA
• Robust inputs withstand ±35V without damage or false outputs

Applications:

• Battery voltage level indicators
• Audio level meters (VU meters)
• Temperature monitoring displays
• Light intensity meters
• Analog panel meter replacements
• Industrial process monitoring

Package Includes:

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