LM77CIMM-3/NOPB by Texas Instruments | Temperature Sensors | Avnet ASIA
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LM77CIMM-3/NOPB

Texas Instruments

Temp Sensor Digital Serial (2-Wire) 8-Pin MSOP T/R

Manufacturer Part #: LM77CIMM-3/NOPB

Alternate Part #: LM77CIMM-3/NOPB


RoHS Compliant

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Information

The LM77 is a digital temperature sensor and thermal window comparator with an I2C Serial Bus interface. The window-comparator architecture of the LM77 eases the design of temperature control systems conforming to the ACPI (Advanced Configuration and Power Interface) specification for personal computers. The open-drain Interrupt (INT) output becomes active whenever temperature goes outside a programmable window, while a separate Critical Temperature Alarm (T_CRIT_A) output becomes active when the temperature exceeds a programmable critical limit. The INT output can operate in either a comparator or event mode, while the T_CRIT_A output operates in comparator mode only.

The host can program both the upper and lower limits of the window as well as the critical temperature limit. Programmable hysterisis as well as a fault queue are available to minimize false tripping. Two pins (A0, A1) are available for address selection. The sensor powers up with default thresholds of 2°C THYST, 10°C TLOW, 64°C THIGH, and 80°C T_CRIT.

The LM77's 3.0V to 5.5V supply voltage range, Serial Bus interface, 9-bit + sign output, and full-scale range of over 128°C make it ideal for a wide range of applications. These include thermal management and protection applications in personal computers, electronic test equipment, office electronics, automotive, and HVAC applications.

 

Key Features

  • Window Comparison Simplifies Design of ACPI Compatible Temperature Monitoring and Control.
  • Serial Bus Interface
  • Separate Open-Drain Outputs for Interrupt and Critical Temperature Shutdown
  • Shutdown Mode to Minimize Power Consumption
  • Up to 4 LM77s Can be Connected to a Single Bus
  • 9-bit + Sign Output; Full-Scale Reading of Over 128°C
  • SOIC and VSSOP 8-lead Packages
  • Supply Voltage 3.0V to 5.5V
  • Supply Current
    • Operating250μA (typ)500 μA(max)
    • Shutdown5 μA(typ)
  • Temperature Accuracy
    • −10°C to 65°C, ±1.5°C(max)
    • −25°C to 100°C, ±2°C(max)
    • −55°C to 125°C, ±3°C(max)
  • Technical Attributes

    Description
    Value
    Find similar Parts
    Pin Count
    8
    Operating Supply Voltage
    3 to 5.5 V
    Operating Temperature
    -55 to 125 °C
    Interface Type
    Serial (2-Wire)
    Mounting
    Surface Mount
    Max Processing Temp
    260
    Accuracy
    ±3(Max) °C
    Output Type
    Digital
    Supplier Package
    MSOP
    Product Dimensions
    3.1(Max) x 3.1(Max) x 0.95(Max)
    MSL Level
    1
    Typical Supply Current
    250 uA
    Lead Finish
    Tin
    Function
    Temp Sensor
    Resolution
    9+Sign Bit

    ECCN / UNSPSC

    Description
    Value
    ECCN:
    EAR99
    SCHEDULE B:
    85423900228.1
    HTSN:
    85423900228.1
    UNSPSC:
    32101600
    UNSPSC VERSION:
    V15.1101

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