LTC2946

RECOMMENDED FOR NEW DESIGNS

Wide Range I2C Power, Charge and Energy Monitor

Data Sheet Product Selection Table
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Part Details

  • 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
LTC2946
Wide Range I2C Power, Charge and Energy Monitor
Wide Range Power, Charge and Energy Monitor with Onboard ADC and I2C ADC Total Unadjusted Error (ADIN) Product Package 1 Product Package 2 Product Package 3 Product Package 4
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 4

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Current Sense Amplifiers 1
LTC2945
RECOMMENDED FOR NEW DESIGNS Wide Range I2C Power Monitor
Power Monitors 1
LTC2947
RECOMMENDED FOR NEW DESIGNS 30A Power/Energy Monitor with Integrated Sense Resistor
Serial Bus Buffers, Extenders, and Accelerators 1
LTC4317
PRODUCTION Dual I2C/SMBus Address Translator
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC2946

Linduino 3

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.

Evaluation Kits

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schematic 5
DC2156A

LTC2946 Demo Board | Wide Range I2C Energy Monitor (requires DC590 or DC2026)

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Product Details

Demonstration circuit 2156A features the LTC2946 rail-to-rail system monitor that measures current, voltage, power, energy and charge. It features an operating range of 2.7V to 100V and includes a shunt regulator for operation from supplies above 100V to allow flexibility in the selection of input supply. The current measurement range of 0V to 100V is independent of the input supply. An onboard, 0.4% accurate, 12-bit ADC measures load current, input voltage and an auxiliary external voltage. A 24-bit power value is generated by digitally multiplying the measured 12-bit load current and input voltage data. Energy and charge data are generated by integrating power and current. 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. Shutdown mode reduces power consumption to 20μA.
DC2156A
LTC2946 Demo Board | Wide Range I2C Energy Monitor (requires DC590 or DC2026)
DC2156A Demo Board DC2156A Demo Board DC2156A Demo Board DC2156A Demo Board DC2156A - Schematic

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