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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

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:

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Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits.

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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.

Discussions

LTC2946 Discussions

Re: LTC2946 output questions
21 week(s) ago in Energy Monitoring and Metering
LTC2946 output questions
21 week(s) ago in Energy Monitoring and Metering
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.