LM86

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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

1

FEATURES

DESCRIPTION

The LM86 is an 11-bit digital temperature sensor with

23

•

Accurately Senses Die Temperature of Remote

a 2-wire System Management Bus (SMBus) serial

ICs or Diode Junctions

interface. The LM86 accurately measures its own

•

Offset Register Allows Sensing a Variety of

temperature as well as the temperature of an external

Thermal Diodes Accurately

device, such as processor thermal diode or diode

connected transistor such as the 2N3904. The

•

On-Board Local Temperature Sensing

temperature

of

any

ASIC

can

be

accurately

•

10-Bit Plus Sign Remote Diode Temperature

determined using the LM86 as long as a dedicated

Data Format, 0.125°C Resolution

diode (semiconductor junction) is available on the

•

T_CRIT_A Output Useful for System Shutdown

target die. The LM86 remote sensor accuracy of

±0.75°C is factory trimmed for the 1.008 typical

•

ALERT Output Supports SMBus 2.0 Protocol

nonideality factor of the mobile Pentium™ III thermal

•

SMBus 2.0 Compatible Interface, Supports

diode. The LM86 has an Offset register to allow

TIMEOUT

measuring other diodes without requiring continuous

•

8-Pin VSSOP and SOIC Packages

software

management.

Contact

hardware.monitor.team@nsc.com to obtain the latest

APPLICATIONS

data for new processors.

•

Computer System Thermal Management

Activation of the ALERT output occurs when any

(For Example, Laptop, Desktop, Workstations,

temperature goes outside a preprogrammed window

set by the HIGH and LOW temperature limit registers

Server)

or exceeds the T_CRIT temperature limit. Activation

•

Electronic Test Equipment

of the T_CRIT_A occurs when any temperature

•

Office Electronics

exceeds the T_CRIT programmed limit. The LM86 is

pin and register compatible with the the Analog

KEY SPECIFICATIONS

Devices ADM1032 and Maxim MAX6657/8.

•

Supply Voltage 3.0V to 3.6V

•

Supply Current 0.8mA (typ)

•

Local Temp Accuracy (includes quantization

error)

–

•

Remote Diode Temp Accuracy (includes

quantization error)

–

–

(max)

–

(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..

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All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2001–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.