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LM86

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±0.75°C remote and local temperature sensor with SMBus interface

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Data sheet

LM86

ACTIVE
Data sheet Order now

Product details

Local sensor accuracy (max) 3 Type Remote Operating temperature range (°C) 0 to 125 Supply voltage (min) (V) 3 Interface type I2C, SMBus Supply voltage (max) (V) 3.6 Features ALERT Supply current (max) (µA) 1700 Temp resolution (max) (bps) 8 Remote channels (#) 1 Addresses 1 Rating Catalog
Local sensor accuracy (max) 3 Type Remote Operating temperature range (°C) 0 to 125 Supply voltage (min) (V) 3 Interface type I2C, SMBus Supply voltage (max) (V) 3.6 Features ALERT Supply current (max) (µA) 1700 Temp resolution (max) (bps) 8 Remote channels (#) 1 Addresses 1 Rating Catalog
SOIC (D) 8 29.4 mm² 4.9 x 6 VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Accurately Senses Die Temperature of Remote ICs or Diode Junctions
  • Offset Register Allows Sensing a Variety of Thermal Diodes Accurately
  • On-Board Local Temperature Sensing
  • 10-Bit Plus Sign Remote Diode Temperature Data Format, 0.125°C Resolution
  • T_CRIT_A Output Useful for System Shutdown
  • ALERT Output Supports SMBus 2.0 Protocol
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • 8-Pin VSSOP and SOIC Packages

Key Specifications

  • Supply Voltage 3.0V to 3.6V
  • Supply Current 0.8mA (typ)
  • Local Temp Accuracy (includes quantization error)
    • TA=25°C to 125°C, ±3.0°C (max)
  • Remote Diode Temp Accuracy (includes quantization error)
    • TA=30°C, TD=80°C, ±0.75°C (max)
    • TA=30°C to 50°C, TD=60°C to 100°C, ±1.0°C (max)
    • TA=0°C to 85°C, TD=25°C to 125°C, ±3.0°C (max)

All trademarks are the property of their respective owners.

  • Accurately Senses Die Temperature of Remote ICs or Diode Junctions
  • Offset Register Allows Sensing a Variety of Thermal Diodes Accurately
  • On-Board Local Temperature Sensing
  • 10-Bit Plus Sign Remote Diode Temperature Data Format, 0.125°C Resolution
  • T_CRIT_A Output Useful for System Shutdown
  • ALERT Output Supports SMBus 2.0 Protocol
  • SMBus 2.0 Compatible Interface, Supports TIMEOUT
  • 8-Pin VSSOP and SOIC Packages

Key Specifications

  • Supply Voltage 3.0V to 3.6V
  • Supply Current 0.8mA (typ)
  • Local Temp Accuracy (includes quantization error)
    • TA=25°C to 125°C, ±3.0°C (max)
  • Remote Diode Temp Accuracy (includes quantization error)
    • TA=30°C, TD=80°C, ±0.75°C (max)
    • TA=30°C to 50°C, TD=60°C to 100°C, ±1.0°C (max)
    • TA=0°C to 85°C, TD=25°C to 125°C, ±3.0°C (max)

All trademarks are the property of their respective owners.

The LM86 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM86 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode connected transistor such as the 2N3904. The temperature of any ASIC can be accurately determined using the LM86 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM86 remote sensor accuracy of ±0.75°C is factory trimmed for the 1.008 typical nonideality factor of the mobile Pentium III thermal diode. The LM86 has an Offset register to allow measuring other diodes without requiring continuous software management. Contact hardware.monitor.team@nsc.com to obtain the latest data for new processors.

Activation of the ALERT output occurs when any temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the T_CRIT temperature limit. Activation of the T_CRIT_A occurs when any temperature exceeds the T_CRIT programmed limit. The LM86 is pin and register compatible with the the Analog Devices ADM1032 and Maxim MAX6657/8.

The LM86 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM86 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode connected transistor such as the 2N3904. The temperature of any ASIC can be accurately determined using the LM86 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM86 remote sensor accuracy of ±0.75°C is factory trimmed for the 1.008 typical nonideality factor of the mobile Pentium III thermal diode. The LM86 has an Offset register to allow measuring other diodes without requiring continuous software management. Contact hardware.monitor.team@nsc.com to obtain the latest data for new processors.

Activation of the ALERT output occurs when any temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the T_CRIT temperature limit. Activation of the T_CRIT_A occurs when any temperature exceeds the T_CRIT programmed limit. The LM86 is pin and register compatible with the the Analog Devices ADM1032 and Maxim MAX6657/8.
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Technical documentation

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* Data sheet 0.75C Accurate, Remote Diode & Local Digital Temp Sensor w/Two-Wire Interface datasheet (Rev. E) 22 Mar 2013
User guide LM86, LM89, LM89-1, LM90, LM99, LM99-1 Evaluation Board User’s Guide 29 Feb 2012
White paper Cost Effective Partitioning of IO & Mgm Func in PCs - Intro of SensorPath Tech 01 Jan 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Driver or library

LM90SW-LINUX — Linux Driver for LM90

The Linux driver supports the LM90 series of Remote and Local Temp Sensors. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

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Support software

DIGITALTEMPSENSORSEVM-SW — Eval Board Software for Hardware Monitors and Digital Temp Sensors

Evaluation Board Software for Hardware Monitors and Digital Temperature Sensors
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Supported products & hardware
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Support software

SENSOREVAL — Eval Board Software For Hardware Monitors And Digital Temperature Sensors

SensorEval
SensorEval software supports the latest TI temperature sensor and hardware monitor evaluation boards via USB interface. It also allows access to sensors mounted directly on motherboards that support Intel chip sets.

  • Download SensorEval Software and Manual
  • Windows XP support is offered for (...)
Supported products & hardware

Supported products & hardware
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