LM86
www.ti.com
SNIS114E –DECEMBER 2001–REVISED MARCH 2013
±0.75°C Accurate, Remote Diode and Local Digital Temperature Sensor With Two-Wire
Interface
Check for Samples: LM86
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FEATURES
DESCRIPTION
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
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Accurately Senses Die Temperature of Remote
ICs or Diode Junctions
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Offset Register Allows Sensing a Variety of
Thermal Diodes Accurately
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On-Board Local Temperature Sensing
10-Bit Plus Sign Remote Diode Temperature
Data Format, 0.125°C Resolution
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T_CRIT_A Output Useful for System Shutdown
ALERT Output Supports SMBus 2.0 Protocol
SMBus 2.0 Compatible Interface, Supports
TIMEOUT
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8-Pin VSSOP and SOIC Packages
software
management.
Contact
hardware.monitor.team@nsc.com to obtain the latest
data for new processors.
APPLICATIONS
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Computer System Thermal Management
(For Example, Laptop, Desktop, Workstations,
Server)
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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Electronic Test Equipment
Office Electronics
KEY SPECIFICATIONS
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Supply Voltage 3.0V to 3.6V
Supply Current 0.8mA (typ)
Local Temp Accuracy (includes quantization
error)
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TA=25°C to 125°C, ±3.0°C (max)
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Remote Diode Temp Accuracy (includes
quantization error)
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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)
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TA=0°C to 85°C, TD=25°C to 125°C, ±3.0°C
(max)
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Pentium is a trademark of Intel Corporation..
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2001–2013, Texas Instruments Incorporated