LM3915 Dot/Bar Display Driver: Circuit, Price and Application

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Published: 29 July 2021 | Last Updated: 29 July 2021

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LM3915N-1

LM3915N-1

Texas Instruments

Obsolete DUAL Display Drivers ICs Tube Tin/Lead (Sn/Pb) 10

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Obsolete DUAL Display Drivers ICs Tube Tin/Lead (Sn/Pb) 10

Hello, everyone, hope you are well today. In this post today, I will discuss LM3915 dot/bar display driver. Just stay with me for a while as I will walk you through LM3915 circuit, price, application and so on. Let's start right now.

This video will show you how to make audio level indicator with LM3915.

How to make audio level indicator with LM3915 ic - freeform circuit │SimpleCircuits

LM3915 Description

LM3915 is a monolithic integrated circuit that can sense analog voltage levels and drive ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display. One pin changes the display from a bar graph to a moving point display. The LED current drive is adjustable and programmable without current limiting resistors. The entire display system can use a single power supply as low as 3V or as high as 25V.


The IC contains an adjustable voltage reference and an accurate ten-step voltage divider. The high mA impedance input buffer accepts signals as low as ground and as high as 1.5V from the positive power supply. In addition, it does not require protection for ±35V input. The input buffer drives 10 independent comparators referenced to precision dividers. The accuracy is usually better than 1 dB.

 

The 3 dB/step display of LM3915 is suitable for signals with a wide dynamic range, such as audio level, power, light intensity or vibration. Audio applications include voltage average or peak level indicators, power meters, and RF signal strength meters. Replacing traditional meters with LED bar graphs can achieve a faster response, more robust display, and high visibility, while retaining the ease of interpretation of the analog display.

 

LM3915 is very easy to apply. In addition to the ten LEDs, the 1.2V full-scale meter requires only one resistor. The other resistor can set the full scale in any range from 1.2V to 12V, regardless of the power supply voltage. Only a potentiometer can easily control the LED brightness.

 

The LM3915 is very versatile. The outputs can drive LCDs, vacuum fluorescents and incandescent bulbs as well as LEDs of any color. Multiple devices can be cascaded for a dot or bar mode display with a range of 60 or 90 dB. LM3915s can also be cascaded with LM3914s for a linear/log display or with LM3916s for an extended-range VU meter.

 

LM3915 is very versatile. The output can drive LCDs, vacuum fluorescent lamps and incandescent bulbs, as well as LEDs of any color. Multiple devices can be cascaded to display in dot or bar mode, with a range of 60 or 90 dB. LM3915s can also be cascaded with LM3914s to achieve linear/logarithmic display, or cascaded with LM3916s to achieve extended range VU meters.


LM3915 Pinout

LM3915 Pinout.jpg

LM3915 CAD Model

Symbol

Symbol.png

Footprint

Footprint.png

3D Model

LM3915 3D Model.jpg

LM3915 Features

• 3 dB/step, 30 dB range

• Drive LED, LCD or vacuum fluorescent lamp

• The user can select the bar or dot display mode from the outside

• Display that can be expanded to 90 dB

• 1.2V to 12V internal reference voltage

• Use a single power supply from 3V to 25V

• Input ground

• The output current can be programmed from 1 mA to 30

• Input can withstand ±35V without damage or wrong output

• The output adopts current regulation and open collector

• Direct drive TTL or CMOS

• The internal 10-step voltage divider is floating and can refer to a wide voltage range

• The rated operating temperature range of LM3915 is 0°C to 70°C. LM3915N-1 is available in 18-pin PDIP package.


Specifications

Texas Instruments LM3915N-1 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments LM3915N-1.
  • Type
    Parameter
  • Mount

    In electronic components, the term "Mount" typically refers to the method or process of physically attaching or fixing a component onto a circuit board or other electronic device. This can involve soldering, adhesive bonding, or other techniques to secure the component in place. The mounting process is crucial for ensuring proper electrical connections and mechanical stability within the electronic system. Different components may have specific mounting requirements based on their size, shape, and function, and manufacturers provide guidelines for proper mounting procedures to ensure optimal performance and reliability of the electronic device.

    Through Hole
  • Mounting Type

    The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.

    Through Hole
  • Package / Case

    refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.

    18-DIP (0.300, 7.62mm)
  • Number of Pins
    18
  • Operating Temperature

    The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.

    0°C~70°C
  • Packaging

    Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.

    Tube
  • JESD-609 Code

    The "JESD-609 Code" in electronic components refers to a standardized marking code that indicates the lead-free solder composition and finish of electronic components for compliance with environmental regulations.

    e0
  • Pbfree Code

    The "Pbfree Code" parameter in electronic components refers to the code or marking used to indicate that the component is lead-free. Lead (Pb) is a toxic substance that has been widely used in electronic components for many years, but due to environmental concerns, there has been a shift towards lead-free alternatives. The Pbfree Code helps manufacturers and users easily identify components that do not contain lead, ensuring compliance with regulations and promoting environmentally friendly practices. It is important to pay attention to the Pbfree Code when selecting electronic components to ensure they meet the necessary requirements for lead-free applications.

    no
  • Part Status

    Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.

    Obsolete
  • Moisture Sensitivity Level (MSL)

    Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures

    1 (Unlimited)
  • Number of Terminations
    18
  • ECCN Code

    An ECCN (Export Control Classification Number) is an alphanumeric code used by the U.S. Bureau of Industry and Security to identify and categorize electronic components and other dual-use items that may require an export license based on their technical characteristics and potential for military use.

    EAR99
  • Terminal Finish

    Terminal Finish refers to the surface treatment applied to the terminals or leads of electronic components to enhance their performance and longevity. It can improve solderability, corrosion resistance, and overall reliability of the connection in electronic assemblies. Common finishes include nickel, gold, and tin, each possessing distinct properties suitable for various applications. The choice of terminal finish can significantly impact the durability and effectiveness of electronic devices.

    Tin/Lead (Sn/Pb)
  • Additional Feature

    Any Feature, including a modified Existing Feature, that is not an Existing Feature.

    SELECTABLE DOT MODE
  • Max Power Dissipation

    The maximum power that the MOSFET can dissipate continuously under the specified thermal conditions.

    1.365W
  • Voltage - Supply

    Voltage - Supply refers to the range of voltage levels that an electronic component or circuit is designed to operate with. It indicates the minimum and maximum supply voltage that can be applied for the device to function properly. Providing supply voltages outside this range can lead to malfunction, damage, or reduced performance. This parameter is critical for ensuring compatibility between different components in a circuit.

    3V~25V
  • Terminal Position

    In electronic components, the term "Terminal Position" refers to the physical location of the connection points on the component where external electrical connections can be made. These connection points, known as terminals, are typically used to attach wires, leads, or other components to the main body of the electronic component. The terminal position is important for ensuring proper connectivity and functionality of the component within a circuit. It is often specified in technical datasheets or component specifications to help designers and engineers understand how to properly integrate the component into their circuit designs.

    DUAL
  • Number of Functions
    1
  • Terminal Pitch

    The center distance from one pole to the next.

    2.54mm
  • Base Part Number

    The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.

    LM3915
  • Pin Count

    a count of all of the component leads (or pins)

    18
  • Number of Outputs
    10
  • Output Voltage

    Output voltage is a crucial parameter in electronic components that refers to the voltage level produced by the component as a result of its operation. It represents the electrical potential difference between the output terminal of the component and a reference point, typically ground. The output voltage is a key factor in determining the performance and functionality of the component, as it dictates the level of voltage that will be delivered to the connected circuit or load. It is often specified in datasheets and technical specifications to ensure compatibility and proper functioning within a given system.

    1.28V
  • Configuration

    The parameter "Configuration" in electronic components refers to the specific arrangement or setup of the components within a circuit or system. It encompasses how individual elements are interconnected and their physical layout. Configuration can affect the functionality, performance, and efficiency of the electronic system, and may influence factors such as signal flow, impedance, and power distribution. Understanding the configuration is essential for design, troubleshooting, and optimizing electronic devices.

    Dot/Bar Display
  • Number of Circuits
    1
  • Operating Supply Current

    Operating Supply Current, also known as supply current or quiescent current, is a crucial parameter in electronic components that indicates the amount of current required for the device to operate under normal conditions. It represents the current drawn by the component from the power supply while it is functioning. This parameter is important for determining the power consumption of the component and is typically specified in datasheets to help designers calculate the overall power requirements of their circuits. Understanding the operating supply current is essential for ensuring proper functionality and efficiency of electronic systems.

    6.1mA
  • Nominal Supply Current

    Nominal current is the same as the rated current. It is the current drawn by the motor while delivering rated mechanical output at its shaft.

    9.2mA
  • Power Dissipation

    the process by which an electronic or electrical device produces heat (energy loss or waste) as an undesirable derivative of its primary action.

    1.365W
  • Output Current

    The rated output current is the maximum load current that a power supply can provide at a specified ambient temperature. A power supply can never provide more current that it's rated output current unless there is a fault, such as short circuit at the load.

    30mA
  • Max Supply Current

    Max Supply Current refers to the maximum amount of electrical current that a component can draw from its power supply under normal operating conditions. It is a critical parameter that ensures the component operates reliably without exceeding its thermal limits or damaging internal circuitry. Exceeding this current can lead to overheating, performance degradation, or failure of the component. Understanding this parameter is essential for designing circuits that provide adequate power while avoiding overload situations.

    9.2mA
  • Max Output Voltage

    The maximum output voltage refers to the dynamic area beyond which the output is saturated in the positive or negative direction, and is limited according to the load resistance value.

    1.34V
  • Min Input Voltage

    The parameter "Min Input Voltage" in electronic components refers to the minimum voltage level that must be applied to the component for it to operate within its specified parameters. This value is crucial as providing a voltage below this minimum threshold may result in the component malfunctioning or not functioning at all. It is important to adhere to the specified minimum input voltage to ensure the proper operation and longevity of the electronic component. Failure to meet this requirement may lead to potential damage to the component or the overall system in which it is used.

    3V
  • Max Input Voltage

    Max Input Voltage refers to the maximum voltage level that an electronic component can safely handle without getting damaged. This parameter is crucial for ensuring the proper functioning and longevity of the component. Exceeding the specified maximum input voltage can lead to overheating, electrical breakdown, or permanent damage to the component. It is important to carefully adhere to the manufacturer's guidelines regarding the maximum input voltage to prevent any potential issues and maintain the reliability of the electronic device.

    25V
  • Display Type

    Display Type in electronic components refers to the technology used to display information or visuals on a screen or panel. It describes the specific method or technology employed to present data, such as LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), LED (Light-Emitting Diode), or CRT (Cathode Ray Tube). Each display type has its own characteristics, including factors like resolution, color accuracy, viewing angles, power consumption, and response time. Choosing the right display type is crucial for determining the quality and performance of the visual output in electronic devices, such as smartphones, TVs, monitors, and digital signage.

    LED, LCD, Vacuum Fluorescent (VF)
  • Interface IC Type

    The parameter "Interface IC Type" in electronic components refers to the type of integrated circuit (IC) that is used to facilitate communication between different electronic devices or subsystems. This IC is responsible for managing the exchange of data and control signals between the devices, ensuring proper communication and coordination. The specific type of interface IC used can vary depending on the requirements of the system, such as serial communication (e.g., UART, SPI, I2C), parallel communication, or specialized interfaces like USB or Ethernet. Choosing the appropriate interface IC type is crucial for ensuring compatibility, reliability, and efficiency in electronic systems.

    LED DISPLAY DRIVER
  • Number of Segments
    10
  • Multiplexed Display Capability

    Multiplexed Display Capability refers to the ability of an electronic component or system to control multiple display elements using fewer input/output lines. This is achieved by rapidly switching between different displays or segments, allowing for efficient communication and reduced wiring complexity. In multiplexed systems, each display is activated sequentially, creating the illusion of simultaneous display to the user. This capability is commonly utilized in devices like LED matrices and LCD screens to enhance functionality while conserving space and resources.

    NO
  • Display Mode

    Display Mode in electronic components refers to the specific way in which information or data is presented on a display screen or panel. This parameter determines how the content is shown to the user, such as through text, graphics, images, or a combination of these elements. The display mode can also include characteristics like resolution, color depth, refresh rate, and aspect ratio, which all contribute to the overall visual experience. Different electronic devices and components may offer various display modes to cater to different user preferences and requirements.

    BAR GRAPH
  • Digits or Characters

    The parameter "Digits or Characters" in electronic components refers to the type of display or output that the component provides. This parameter indicates whether the component displays numerical digits, such as numbers, or alphanumeric characters, which include both letters and numbers. Components with a "Digits" display typically show numerical values only, making them suitable for applications where numerical data is the primary output. On the other hand, components with a "Characters" display can show both numbers and letters, offering more flexibility in displaying information or messages.When selecting electronic components, understanding whether they provide a "Digits" or "Characters" display can help ensure compatibility with the intended application and the type of information that needs to be displayed.

    10 Steps
  • Height
    3.3mm
  • Length
    22.86mm
  • Width
    6.35mm
  • REACH SVHC

    The parameter "REACH SVHC" in electronic components refers to the compliance with the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation regarding Substances of Very High Concern (SVHC). SVHCs are substances that may have serious effects on human health or the environment, and their use is regulated under REACH to ensure their safe handling and minimize their impact.Manufacturers of electronic components need to declare if their products contain any SVHCs above a certain threshold concentration and provide information on the safe use of these substances. This information allows customers to make informed decisions about the potential risks associated with using the components and take appropriate measures to mitigate any hazards.Ensuring compliance with REACH SVHC requirements is essential for electronics manufacturers to meet regulatory standards, protect human health and the environment, and maintain transparency in their supply chain. It also demonstrates a commitment to sustainability and responsible manufacturing practices in the electronics industry.

    No SVHC
  • Radiation Hardening

    Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation, especially for environments in outer space (especially beyond the low Earth orbit), around nuclear reactors and particle accelerators, or during nuclear accidents or nuclear warfare.

    No
  • RoHS Status

    RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.

    Non-RoHS Compliant
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LM3915 Block Diagram

Block Diagram.png

Where to use LM3915?

The LM3915 is an audio controlled LED driver IC, meaning it can control (turn on or off) 10 LED lights based on an analog input voltage of the audio signal. As we know the voltage value of an audio signal varies based on the amplitude of the signal, this amplitude is directly proportional to the loudness of the audio signal. Thus by making the LEDs glow with respect to the amplitude of the audio signal will help us visualize the audio signal.  This IC eliminates the need for microcontroller and programming and also reduces the hardware required to control 10 LEDs.

 

The analog input voltage of the audio signal can vary from 1.2V to 12V and the LED current can be limited by simply using a resistor divider network on pin 7 (Ref Out). The IC increments the LED by one step for every 3dB rise in Audio signal, thus for 10 LEDs the IC can monitor upto 30dB audio signal. Further the IC can also be cascaded to monitor upto 90dB of audio signal by using 30 LEDs.

 

Since the LEDs can be controlled without any flickering and flawlessly with equal brightness these ICs are commonly used in visual alarms and other metering/monitoring applications.  So, if you are looking for an IC to driver your bar LED lights or other sequence of 10 LED then this IC might be of interest to you.


How to use LM3915?

The LM3915 can be easily operated with very little additional components. The complete working of the IC and how do use it is discussed in the video linked at the bottom of this page. A sample application circuit from the LM3915 datasheet is given below.

HOW TO USE.png

As you can see we only require the LEDs and two resistors as additional component to use this IC. The IC can operate between 3V to 25V. The Audio signal maximum voltage can be as high as 12V or as low as 1.2V. Based on this voltage, the reference voltage has to be set in the circuit using the resistors R1 and R2. Let’s assume that the maximum voltage level from our audio signal is 3.6V and the minimum voltage is 0V. In this case, the pin RHI and REF OUT should be supplied with 3.6V and the pin RLO should be supplied with 0V. The IC also allows the designer to set the required current that should flow through LED. Both the LED current and the reference voltage can be set with the Resistor R1 and R2 using the below formulae.

 


LM3915 Circuit

LM3915 Output Circuit.png

Output Circuit

Low Cost Circuit for 60 dB Display.png

Low Cost Circuit for 60 dB Display

. Improved Circuit for 60 dB Display.png

Improved Circuit for 60 dB Display

LM3915 Applications

■Audio Visualization Circuit

■Crude battery indicator

■Low-cost monitoring equipment

■Digital meter

■Electronic display

■Fade in and fade out bar


LM3915 Mechanical Data

Mechanical Data.png

LM3915 Manufacturer

Texas Instruments Incorporated (TI) is an American technology company headquartered in Dallas, Texas, that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally.[6] It is one of the top 10 semiconductor companies worldwide based on sales volume.The company's focus is on developing analog chips and embedded processors, which account for more than 80% of its revenue.TI also produces TI digital light processing technology and education technology products including calculators, microcontrollers and multi-core processors. The company holds 45,000 patents worldwide as of 2016.


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Datasheet PDF

Download datasheets and manufacturer documentation for Texas Instruments LM3915N-1.
Frequently Asked Questions

1.What chip is LM3915? What is the role of it?

LM3915 is a 10-light level indicator control chip with high sensitivity. The input volume (sensitivity) can also be adjusted with a 50K resistor. The function of LM3915 is actually an integrated circuit that controls 10 LED lights to turn on and off through the input audio, and it has double rows of 18 pins.

2.Can the LM3915 audio input terminal be directly connected to the output terminal of the voice control circuit?

The input terminal is for audio input, and the output terminal is for audio output. If it is LM3915, the audio output terminal can be directly connected to the input terminal of the voice control circuit.

3.What is the difference between LM3915 and LM3915N-1?

There is no difference in pin arrangement and electrical functions between the two types of chips. The only difference is the packaging.

4.What can be used instead of LM3915?

LM3915 is a ten-segment LED display drive circuit, which can be replaced by ECG1509.

5.Can LM3915 chips be used in circuits in parallel?

No, it can not. LM3915 is a level indicator chip. The input level value is different, and the number of LED lights is different. According to this feature, it is usually used as an audio level indicator, which flashes with the music. LM3915 is a 10-segment indicator. If you need to increase it to 20-segment, you can use two 3915 cascades, but not in parallel. The output of the first chip can be output to the input of the second chip.
LM3915N-1

Texas Instruments

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