Tuesday, July 03, 2007

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 whole system from less than 3V.

LM3914 - Versatile and Easy use Display
  • 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
  • LED driver outputs are current regulated, open-collectors
The circuit contains its own adjustable reference and accurate 10-step voltage divider. The low-bias-current input buffer accepts signals down to ground, or V-, yet needs no protection against inputs of 35V above or below ground. The buffer drives 10 individual comparators referenced to the precision divider. Indication non-linearity can thus be held typically to ½%, even over a wide temperature range.

My LM3914 Circuits

Millivolt Meter using a LM3914 LED Dot Display
Millivolt Meter using a LM3914 LED Dot Display

Blocks

80C51 Analog Analog-Design Analytical-Instrumentation Android Application-Notes-2 ASIC-Design ASIC-SOC-FPGA Bipolar-Transistors Capacitors Circuit-Archive Circuit-Design Circuit-Design-2 Communications Communications-Chips Component-Testing Computer-IC-Module Computer-Interfacing Control-Systems Design-Service Design-Service-2 Design-Service-3 Digital Discrete-Semiconductors DSP EDA EDA-2 EDA-3 EDA-4 EDA-5 Educational Educational-2 Electrical Electromechanical Embedded Embedded-2 Embedded-Applications Embedded-Systems-Tools Energy-Power Engineering-Services Engineering-Services-2 Engineering-Services-3 ESD-EMI-RFI Firmware Home-Automation Industrial-Automation IoT-WSN-M2M LED-Lighting Magazines Manufacturing-Services Materials-Nanotech Mechanical-3D-CAD Mechatronics Medical-Electronics MEMS Microcontroller Microelectronics Mixed Mixed-Semiconductor Mixed-Signal-Design Opamps Open-Hardware Optoelectronics Organizations-Associations Passive-Components PCB-Layout Photonics-Optics PIC Power-Devices Power-Electronics Power-Electronics-Design Process-Control Process-Control-2 Product-Safety Product-System-Design Projects Quality Reference Research-Institutes RF-Components RF-Design RF-Engineering-Services RF-Microwave RF-Semiconductor RF-Wireless-Networking Robotics Scientific-Software Semiconductors Sensors SMPS-Power-Supply Software-Code Spice-Simulation Standards Standards-2 Tech-Docs Tech-Media Technical-Computing Test-Measurement TM-Applications Training-Consulting Virtual-Instrumentation