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LTC2946: Wide Range I2C Power, Charge and Energy Monitor Data Sheet3/25/2015PDF462K
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
Recommended for New Designs
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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R554 Reliability Data3/23/2018PDF15 K
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DC2156A - Demo Manual9/3/2014PDF2M
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Power System Manager and Super Sequencer Selection Guide2/23/2018PDF4M
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Power and Thermal Monitoring1/9/2017PDF1M
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Very Wide Range I2C Energy Monitor9/3/2014PDF608K
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1% Accurate Energy Monitor6/27/2014PDF1M
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High Accuracy Energy Monitoring Solutions from Linear Technology9/6/2016
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I2C Primer: What is I2C? (Part 1)9/2/2016
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A Sensible 30A Energy Meter8/26/2016PDF1M
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Understanding Power Monitor Accuracy2/20/2015
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.
Models for the following parts are available in LTspice:
LTC2946
Linduino
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Linduino code repository on GitHub and instructions on how to use the code.
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.
PCN-PDN Information
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Support & Discussions
LTC2946 Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
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Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.