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Data Sheet
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Overview

Features and Benefits

  • Rail-to-Rail Input Range: 0V to 100V
  • Wide Input Supply Range: 2.7V to 100V
  • Shunt Regulator for Supplies >100V
  • ΔΣ ADC with Less Than ±0.4% Total Unadjusted Error
  • 12-Bit Resolution for Current and Voltages
  • ±1% Accurate Power and Energy Measurements
  • ±0.6% Accurate Current and Charge Measurements
  • Additional ADC Input Monitors an External Voltage
  • Internal ±5% or External Time Bases
  • Continuous Scan and Snapshot Modes
  • Stores Minimum and Maximum Values
  • Alerts When Limits Exceeded
  • Split SDA Pin Eases Opto-Isolation
  • Shutdown Mode with IQ < 40μA
  • Available in 4mm × 3mm DFN and 16-Lead MSOP Packages

Product Details

The LTC2946 is a rail-to-rail system monitor that measures current, voltage, power, charge and energy. It features an operating range of 2.7V to 100V and includes a shunt regulator for supplies above 100V. The current measurement common mode range of 0V to 100V is independent of the input supply. A 12-bit ADC measures load current, input voltage and an auxiliary external voltage. Load current and internally calculated power are integrated over an external clock or crystal or internal oscillator time base for charge and energy. An accurate time base allows the LTC2946 to provide measurement accuracy of better than ±0.6% for charge and ±1% for power and energy. Minimum and maximum values are stored and an overrange alert with programmable thresholds minimizes the need for software polling. Data is reported via a standard I2C interface.

The LTC2946 I2C interface includes separate data input and output pins for use with standard or opto-isolated I2C connections. The LTC2946-1 has an inverted data output for use with inverting opto-isolator configurations.

Applications

  • Telecom Infrastructure
  • Industrial Equipment
  • General Purpose Energy Measurement

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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Product Selector Card (3)
  • Solutions Bulletins & Brochures (1)
  • Technical Articles (4)
    • Document Type

    Tools & Simulations

    LTspice

    LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

    LTspice

    Models for the following parts are available in LTspice:

    LTC2946

    Linduino

    Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

    Linduino code repository on GitHub and instructions on how to use the code.

    Purchase Linduino

    Linduino

    Code Files

    LTC2946 - DC2156A Linduino.INO File
    LTC2946 Linduino Header File
    LTC2946 Linduino.CPP

    Product Recommendations

    LTC2946 Companion Parts

    Recommended Related Parts

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC2946CDE#PBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946CDE#TRPBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946CDE-1#PBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946CDE-1#TRPBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946CMS#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946CMS#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946CMS-1#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946CMS-1#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946HDE#PBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946HDE#TRPBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946HDE-1#PBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946HDE-1#TRPBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946HMS#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946HMS#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946HMS-1#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946HMS-1#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946IDE#PBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946IDE#TRPBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946IDE-1#PBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946IDE-1#TRPBF Material Declaration Reliability Data 16-Lead DFN (4mm x 3mm w/ EP)
    LTC2946IMS#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946IMS#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946IMS-1#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946IMS-1#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946MPMS#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946MPMS#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946MPMS-1#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC2946MPMS-1#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    Wafer Fabrication Data R554 Reliability Data

    PCN-PDN Information

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    Select Model for PCN Information
    • LTC2946CMS#PBF Production
    • LTC2946CMS#TRPBF Production
    • LTC2946CMS-1#PBF Production
    • LTC2946CMS-1#TRPBF Production
    • LTC2946HMS#PBF Production
    • LTC2946HMS#TRPBF Production
    • LTC2946HMS-1#PBF Production
    • LTC2946HMS-1#TRPBF Production
    • LTC2946IMS#PBF Production
    • LTC2946IMS#TRPBF Production
    • LTC2946IMS-1#PBF Production
    • LTC2946IMS-1#TRPBF Production
    • LTC2946MPMS#PBF Production
    • LTC2946MPMS#TRPBF Production
    • LTC2946MPMS-1#PBF Production
    • LTC2946MPMS-1#TRPBF Production

    Support & Discussions

    LTC2946 Discussions

    RE: Correct QuikEval software for DC2156A (LTC2946) demo board? We see "Cannot load COM module for device"
    RE: Using DC2156A board with DC590B/QuikEval - getting "Cannot load COM module for device". Where can I find the correct file, and what is it called? Thanks! PS: I did find "ins2946.msi" via guesswork, and installed it, but the problem
    All LTC2946 Discussions
    LTC2946 Contact ADI Technical Support »
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    LTC2946 Contact ADI Technical Support » LTC2946 Ask your question »

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