National Semiconductor | High-performance Analog

 

 LM95235   

Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm™ Technology from the PowerWise® Family
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Features

  • Remote and Local temperature channels
  • TruTherm BJT beta compensation technology
  • LM95235Q is AEC-Q100 Grade 3 compliant and is manufactured on an Automotive Grade Flow
  • Diode Model Selection Bit - MMBT3904 or 65/90 nm processor diodes
  • Two Formats: −128°C to 127.875°C and 0°C to 255.875°C
  • Digital filter for remote channel
  • Programmable TCRIT and OS thresholds
  • Programmable shared hysteresis register
  • Diode Fault Detection
  • Mask, Offset, and Status Registers
  • SMBus 2.0 compatible interface, supports TIMEOUT
  • Programmable conversion rate for best power consumption
  • Three-level address pin
  • Standby mode one-shot conversion control
  • Pin-for-pin compatible with the LM86/LM89
  • 8-pin MSOP package
  • Description

    The LM95235 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) interface and TruTherm technology that can monitor the temperature of a remote diode as well as its own temperature. The LM95235 can be used to very accurately monitor the temperature of external devices such as microprocessors, graphics processors, or a diode-connected MMBT3904 transistor. For automotive applications the LM95235Q is available that is AEC-Q100 Grade3 compliant and is manufactured on an Automotive Grade Flow. TruTherm BJT (transistor) beta compensation technology allows the LM95235 to precisely monitor thermal diodes found in 90 nm and smaller geometry processes. LM95235 reports temperature in two different formats for +127.875°C/-128°C range and 0°C/255°C range. The LM95235 ^T_CRIT and ^OS outputs are asserted when either unmasked channel exceeds its programmed limit and can be used to shutdown the system, to turn on the system fans, or as a microcontroller interrupt function. The current status of the ^T_CRIT and ^OS pins can be read back from the status registers via the SMBus interface. All limits have a shared programmable hysteresis register.

    The remote temperature channel of the LM95235 has a programmable digital filter. The LM95235 contains a diode model selection bit to select between a typical Intel® processor on a 65 nm or 90 nm process or MMBT3904, as well as an offset register for maximum flexibility and best accuracy.

    The LM95235 has a three-level address pin to connect up to 3 devices to the same SMBus master, that is shared with the ^OS output. The LM95235 has a programmable conversion rate register and a standby mode to save power. One conversion can be triggered in standby mode by writing to the one-shot register.

    Key Specification
    Supply Voltage 3.0 V to 3.6 V
    Supply Current, Conv. Rate = 1 Hz 350 µA (typ)
    Remote Diode Temperature Accuracy
    TA = 25°C to 85°C; TD = 60°C to 100°C ±0.75°C (max)
    TA = 25°C to 85°C; TD = 40°C to 125°C ±1.5°C (max)
    Local Temperature Accuracy
    TA = 25°C to 100°C ±2.0°C (max)
    Conversion Rate, Both Channels 16 to 0.4 Hz


    Applications

  • Processor/Computer System Thermal Management

  •   (e.g. Laptops, Desktops, Workstations, Servers)
  • Electronic Test Equipment and Office Electronics
  • Also Recommended
    LM95233Dual Remote Diode Sensor With TruTherm(TM) BJT/Transistor Beta Compensation Technology
    LM95234Quad Remote Diode Sensor With TruTherm(TM) BJT/Transistor Beta Compensation Technology
    LM95245Single Remote Diode Sensor With 45nm TruTherm(TM) BJT/Transistor Beta Compensation Technology



    Parameters / ValuesLM95235 LM95233 LM95234 LM95245
    Remote Diode Thermal Sensors1 2 4 1
    Temperature Accuracy (+/-)0.75 deg C 0.875 deg C 0.875 deg C 0.75 deg C
    Supply Min3.0 Volt 3.0 Volt 3.0 Volt 3.0 Volt
    Quiescent Current0.350 mA 0.57 mA 0.57 mA 0.25 mA
    Temperature Min25 deg C -40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 140 deg C 140 deg C 125 deg C
    Interface Type2-Wire Serial 2-Wire Serial 2-Wire Serial SMBus
    Programmable SetpointsYes Yes Yes Yes
    TruTherm(TM) Beta CompensationYes Yes Yes Yes
    Resolution13 bits 13 bits 13 bits 13 bits
    Resolution degC/LSB0.03125 0.03125 0.03125 0.03125
    Supply Max3.6 Volt 3.6 Volt 3.6 Volt 3.6 Volt
    Shut downYes Yes Yes Yes
    Interrupt Outputs2 3 3 2
    Fault QueueNo No Yes No
    AEC Q-100 Automotive Grade3
    AutomotiveYes Yes Yes
    PowerWiseYes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM95235 Precision Remote Diode Temperature Sensor with SMBus Interface and TruTherm™ Technology564
    Kbytes
    15-Aug-08   


    Other Technical Documents
    TitleTypeDate
    TruTherm Technology PresentationApp Note 2006-05-23

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM95235CIMM/NOPB

    LM95235CIMM

    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide2656
    AVNET-EMWorldwide2000
    DIGI-KEYWorldwide1670
    MOUSERWorldwide454
    RS COMPONENTSWorldwide55
    TAYLORAmericas2656
    $0.78 each at 1K+ pcsreel
    of
    1000
    LM95235CIMMX/NOPB

    LM95235CIMMX

    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide3500
    DIGI-KEYWorldwide0
    $0.78 each at 1K+ pcsreel
    of
    3500
    LM95235DIMM/NOPB

    LM95235DIMM

    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 8 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide2202
    MOUSERWorldwide975
    RS COMPONENTSWorldwide10
    $1.22 each at 1K+ pcsreel
    of
    1000
    LM95235DIMMX/NOPB

    LM95235DIMMX

    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.22 each at 1K+ pcsreel
    of
    3500
    LM95235EIMM/NOPB

    LM95235EIMM

    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1000
    DIGI-KEYWorldwide2656
    MOUSERWorldwide900
    TAYLORAmericas1000
    $1.13 each at 1K+ pcsreel
    of
    1000
    LM95235EIMMX/NOPB

    LM95235EIMMX

    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.13 each at 1K+ pcsreel
    of
    3500
    LM95235QEIMM/NOPB

    LM95235QEIMM
    Auto Grade 3
    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1000
    DIGI-KEYWorldwide1054
    MOUSERWorldwide865
    TAYLORAmericas1000
    $1.35 each at 1K+ pcsreel
    of
    1000
    LM95235QEIMMX/NOPB

    LM95235QEIMMX
    Auto Grade 3
    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.35 each at 1K+ pcsreel
    of
    3500

    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 LM95235.

    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 LM95235 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM95235EVAL/NOPB

    Precision Remote Diode Temperature Sensor with SMBus Interface and TruThermTM TechnologyFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $120.00 each1

    The LM95235 is a +/-0.75°C accurate remote diode digital temperature sensor with an SMBus interface and TruTherm™ technology.

    This evaluation board is designed to ease the evaluation and design-in of National Semiconductors LM95235 remote diode digital temperature sensor. The LM95235EVAL board connects via USB to a PC and is controlled by SensorEval software, which is included in the kit. SensorEval software allows easy access and control of the LM95235`s registers. The LM95235EVAL board includes headers and jumpers for controlling and possibly remotely connecting the digital I/O pins and the remote diode pins of the LM95235. The LM95235EVAL board is powered through the USB connection no other external power sources are necessary.

    Features:

    • Accurately senses remote and local diode temperatures
    • Diode Model Selection Bit - MMBT3904 or 65/90 nm processor diodes
    • Two Formats: h2;128°C to +127.875°C and 0°C to 255.875°C
    • Digital filter for remote channel
    • Programmable TCRIT and OS thresholds
    • Programmable shared hysteresis register
    • Diode Fault Detection
    • Mask, Offset, and Status Registers
    • SMBus 2.0 compatible interface, supports TIMEOUT
    • Programmable conversion rate for best power consumption
    • Three-level address pin
    • Standby mode one-shot conversion control
    • Pin-for-pin compatible with the LM86/LM89
    • 8-pin MSOP package

    Contents:

    http://www.national.com/en/tempsensors/tempsensor_evalboards.html TruTherm™ is a trademark of National Semiconductor Corporation.




    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
    LM95235CIMM/NOPB

    LM95235CIMM
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    T36C
    LM95235CIMMX/NOPB

    LM95235CIMMX
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    T36C
    LM95235DIMM/NOPB

    LM95235DIMM
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    T36D
    LM95235DIMMX/NOPB

    LM95235DIMMX
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    T36D
    LM95235EIMM/NOPB

    LM95235EIMM
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    T36E
    LM95235EIMMX/NOPB

    LM95235EIMMX
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    T36E
    LM95235QEIMM/NOPB

    LM95235QEIMM
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    36QE
    LM95235QEIMMX/NOPB

    LM95235QEIMMX
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    36QE

    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 LM95235.

    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 LM95235 is located at RoHS Status.

    CAD Symbols and Models
    Download LM95235 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM95235CIMMCMOS70213010015840003449464325
    LM95235CIMMXCMOS70213010015840003449464325
    LM95235DIMMCMOS70213010015840003449464325
    LM95235DIMMXCMOS70213010015840003449464325
    LM95235EIMMCMOS70213010015840003449464325
    LM95235EIMMXCMOS70213010015840003449464325
    LM95235QEIMMCMOS70213010015840003449464325
    LM95235QEIMMXCMOS70213010015840003449464325

    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 LM95235.

    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 LM95235 is located at RoHS Status.

    [Information as of 9-Feb-2012]