National Semiconductor | High-performance Analog

 

 LM73   

2.7V, SOT-23, 11- to 14- Bit Digital Temperature Sensor with 2-Wire Interface from the PowerWise® Family
Click link to Download

Features

  • Single address pin offers choice of three selectable addresses per version for a total of six possible addresses.
  • SMBus and I 2C-compatible two-wire interface
  • Supports 400 kHz operation
  • Shutdown mode with one-shot feature available for very low average power consumption
  • Programmable digital temperature resolution from 11 bits to 14 bits.
  • Fast conversion rate ideal for quick power up and measuring rapidly changing temperature
  • Open-drain ^ALERT output pin goes active when temperature is above a programmed temperature limit
  • Very stable, low-noise digital ouput.
  • UL Recognized Component
  • Description

    The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is compatible with the SMBus and I 2C® interfaces. The host can query the LM73 at any time to read temperature. Available in a 6-pin SOT-23 package, the LM73 occupies very little board area while operating over a wide temperature range (-40°C to 150°C) and providing ±1.0°C accuracy from -10°C to 80°C. The user can optimize between the conversion time and the sensitivity of the LM73 by programming it to report temperature in any of four different resolutions. Defaulting to 11-bit mode (0.25°C/LSB), the LM73 measures temperature in a maximum time of 14 ms, making it ideal for applications that require temperature data very soon after power-up. In its maximum resolution, 14-bit mode (0.03125°C/LSB), the LM73 is optimized to sense very small changes in temperature.

    A single multi-level address line selects one of three unique device addresses. An open-drain ^ALERT output goes active when the temperature exceeds a programmable limit. Both the data and clock lines are filtered for excellent noise tolerance and reliable communication. Additionally, a time-out feature on the clock and data lines causes the LM73 to automatically reset these lines if either is held low for an extended time, thus exiting any bus lock-up condition without processor intervention.

    Key Specification
    Supply Voltage 2.7V to 5.5V
    Supply Current operating 320 µA (typ)
    495 µA (max)
    shutdown 8 µA (max)
        1.9 µA (typ)
    Temperature −10°C to 80°C ±1.0°C (max)
    Accuracy −25°C to 115°C ±1.5°C (max)
      −40°C to 150°C ±2.0°C (max)
    Resolution   0.25°C to 0.03125°C
    Conversion Time 11-bit (0.25°C) 14 ms (max)
    14-bit (0.03125°C) 112 ms (max)


    Applications

  • Portable Electronics
  • Notebook Computers
  • Automotive
  • System Thermal Management
  • Office Electronics



  • Typical Application
    click for larger image


    Block Diagram
    click for larger image



    Typical Performance
    click for larger image


     

    ParametersValues
    Temperature Accuracy (+/-) 1 deg C
    Supply Min 2.7 Volt
    Quiescent Current 0.495 mA
    Temperature Min -40 deg C
    Temperature Max 150 deg C
    Interface Type 2-Wire Serial
    Programmable Setpoints Yes
    Resolution 14 bits
    Resolution degC/LSB 0.03125
    Supply Max 5.5 Volt
    Shut down Yes
    Interrupt Outputs 1
    Fault Queue No
    Automotive Yes
    PowerWise Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM73 2.7V, SOT-23, 11- to 14- Bit Digital Temperature Sensor with 2-Wire Interface442
    Kbytes
    13-May-09   


    Application Notes
    TitleSizeDateOther
    Language
    AN-2113: Application Note 2113 Applying I2C Compatible Temperature Sensors in Systems with Slow Clock Edges81
    Kbytes
    3-May-11 

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM73CIMK-0/NOPB


    RoHS Status


    TSOT
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    CEACAsia Pacific16000
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia47
    RS COMPONENTSWorldwide730
    TECHMOSAAsia Pacific1000
    $0.75 each at 1K+ pcsreel
    of
    1000
    LM73CIMK-1/NOPB


    RoHS Status


    TSOT
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide3000
    DIGI-KEYWorldwide3873
    FARNELLEurope and Asia1095
    MOUSERWorldwide883
    NEWARKAmericas722
    RS COMPONENTSWorldwide810
    TAYLORAmericas3000
    $0.75 each at 1K+ pcsreel
    of
    1000
    LM73CIMKX-0/NOPB


    RoHS Status


    TSOT
    Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    ARROWWorldwide3000
    DIGI-KEYWorldwide0
    MOUSERWorldwide2997
    TAYLORAmericas3000
    $0.75 each at 1K+ pcsreel
    of
    3000
    LM73CIMKX-1/NOPB


    RoHS Status


    TSOT
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide3000
    $0.75 each at 1K+ pcsreel
    of
    3000

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM73.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM73 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM73EVAL/NOPB

    LM73EVAL Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $63.50 each1

    Description:

    The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is compatible with the SMBus and I 2C® interfaces. The LM73EVAL is the evaluation board for the LM73.

    Features:

    • Single address pin offers choice of three selectable addresses per version for a total of six possible addresses.
    • SMBus and I 2C-compatible two-wire interface
    • Supports 400 kHz operation
    • Shutdown mode with one-shot feature available for very low average power consumption
    • Programmable digital temperature resolution from 11 bits to 14 bits.
    • Fast conversion rate ideal for quick power up and measuring rapidly changing temperature
    • Open-drain ^ALERT output pin goes active when temperature is above a programmed temperature limit
    • Very stable, low-noise digital ouput.
    • UL Recognized Component

    Contents:

    • Evaluation Board
    • Harware kit which includes:
    • User's guide
    • thank you letter
    • evaluation board license agreement



    National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

    Lead Free product status is available through the search tool located here

    Part Number(s)
    (NSID)
    Weight
    (milligrams)
    TypePinsMSL RatingPeak ReflowRoHS
    Status
    CAD SymbolsModelsPackage
    Marking
    Format
    LM73CIMK-0/NOPB

    12.959
    TSOT61260DetailDownloadN/A
    T730
    XTT
    LM73CIMK-1/NOPB

    12.959
    TSOT61260DetailDownloadN/A
    T731
    XTT
    LM73CIMKX-0/NOPB

    12.959
    TSOT61260DetailDownloadN/A
    T730
    XTT
    LM73CIMKX-1/NOPB

    12.959
    TSOT61260DetailDownloadN/A
    T731
    XTT

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM73.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM73 is located at RoHS Status.

    CAD Symbols and Models
    Download LM73 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM73CIMK-0CMOS70213010015840003449464325
    LM73CIMK-1CMOS70213010015840003449464325
    LM73CIMKX-0CMOS70213010015840003449464325
    LM73CIMKX-1CMOS70213010015840003449464325

    Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

    For more information on Reliability Metrics, please click here.


    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM73.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM73 is located at RoHS Status.

    Motor Control Sensing in Factory Automation
    Loading video...


    Factory Automation Overview
    Loading video...


    Motor Control Sensing in Factory Automation
    Date: 2009-08-04
    Length: 0:24:21
    Factory Automation Overview
    Date: 2009-08-04
    Length: 0:32:30
    [Information as of 8-Feb-2012]