LTC2945
Info : RECOMMENDED FOR NEW DESIGNS
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LTC2945

Wide Range I2C Power Monitor

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 26
1ku List Price Starting From $4.27
Features
  • Rail-to-Rail Input Range: 0V to 80V
  • Wide Input Supply Range: 2.7V to 80V
  • Shunt Regulator for Supplies >80V
  • ΔΣ ADC with less than ±0.75% Total Unadjusted Error
  • 12-Bit Resolution for Current and Voltages
  • Internal Multiplier Calculates 24-Bit Power Value
  • Stores Minimum and Maximum Values
  • Alerts When Limits Exceeded
  • Additional ADC Input Monitors an External Voltage
  • Continuous Scan and Snapshot Modes
  • Shutdown Mode with IQ < 80μA
  • Split SDA for Opto-Isolation
  • Available in 12-Lead 3mm × 3mm QFN and MSOP Packages
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC2945 is a rail-to-rail system monitor that measures current, voltage, and power. It features an operating range of 2.7V to 80V and includes a shunt regulator for supplies above 80V to allow flexibility in the selection of input supply. The current measurement range of 0V to 80V is independent of the input supply. An onboard 0.75% 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. 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.

The LTC2945 I2C interface includes separate data input and output pins for use with standard or opto-isolated I2C connections. The LTC2945-1 has an inverted data output for use with inverting opto-isolator configurations.

APPLICATIONS

  • Telecom Infrastructure
  • Industrial
  • Automotive
  • Consumer
Part Models 26
1ku List Price Starting From $4.27

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Documentation

Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Jun 5, 2024

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Epoxy Change from Henkel 8290 to 8290A for MSOP (3)

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Oct 11, 2022

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package

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Epoxy Change from Henkel 8290 to 8290A for MSOP (3)

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Feb 4, 2020

- 20_0129

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Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

LTC2945CMS#PBF

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LTC2945CMS-1#PBF

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LTC2945CMS-1#TRPBF

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Oct 11, 2022

- 22_0244

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1697A

LTC2945 Demo Board | Wide Range I2C Power Monitor (requires DC2026)

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DC1697A

LTC2945 Demo Board | Wide Range I2C Power Monitor (requires DC2026)

LTC2945 Demo Board | Wide Range I2C Power Monitor (requires DC2026)

Product Detail

Demonstration circuit 1697A features the LTC2945. The LTC2945 is a rail-to-rail system monitor that measures current, voltage, and power. It features an operating range of 2.7V to 80V and includes a shunt regulator for supplies above 80V to allow flexibility in the selection of input supply. The current common mode measurement range of 0V to 80V is independent of the input supply. An onboard 0.75% 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. 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 demo board is populated for a 5A application. This can be changed by populating R1 accordingly.


 


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

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Reference Designs

Reference Designs 1

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Features and Benefits

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