LM63
www.ti.com
SNAS190E –SEPTEMBER 2002–REVISED MAY 2013
LM63 ±1°C/±3°C Accurate Remote Diode Digital Temperature Sensor with Integrated Fan
Control
Check for Samples: LM63
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FEATURES
DESCRIPTION
The LM63 is a remote diode temperature sensor with
integrated fan control. The LM63 accurately
measures: (1) its own temperature and (2) the
temperature of a diode-connected transistor, such as
a 2N3904, or a thermal diode commonly found on
Computer Processors, Graphics Processor Units
(GPU) and other ASIC's. The LM63 remote
temperature sensor's accuracy is factory trimmed for
the series resistance and 1.0021 non-ideality of the
Intel 0.13 µm Pentium 4 and Mobile Pentium 4
Processor-M thermal diode. The LM63 has an offset
register to correct for errors caused by different non-
ideality factors of other thermal diodes.
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Accurately Senses Diode-Connected 2N3904
Transistors or Thermal Diodes On Board Large
Processors or ASICs
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Accurately Senses its Own Temperature
Factory Trimmed for Intel® Pentium® 4 and
Mobile Pentium 4 Processor-M Thermal Diodes
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Integrated PWM Fan Speed Control Output
Acoustic Fan Noise Reduction With User-
Programmable 8-Step Lookup Table
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Multi-Function, User-Selectable Pin for Either
ALERT Output, or Tachometer Input,
Functions
The LM63 also features an integrated, pulse-width-
modulated (PWM), open-drain fan control output. Fan
speed is a combination of the remote temperature
reading, the lookup table and the register settings.
The 8-step Lookup Table enables the user to
program a non-linear fan speed vs. temperature
transfer function often used to quiet acoustic fan
noise.
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Tachometer Input for Measuring Fan RPM
Smart-Tach Modes for Measuring RPM of Fans
With Pulse-Width-Modulated Power as Shown
in Typical Application
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Offset Register can Adjust for a Variety of
Thermal Diodes
10 Bit Plus Sign Remote Diode Temperature
Data Format, With 0.125°C Resolution
CONNECTION DIAGRAM
SMBus 2.0 Compatible Interface, Supports
TIMEOUT
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8
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SMBCLK
SMBDAT
VDD
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LM86-Compatible Pinout
LM86-Compatible Register Set
8-Pin SOIC Package
D+
D-
LM63
ALERT / TACH
GND
PWM
APPLICATIONS
Figure 1. 8-Pin SOIC (D Package)
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Computer Processor Thermal Management
(Laptop, Desktop, Workstations, Servers)
Graphics Processor Thermal Management
Electronic Test Equipment
Projectors
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Office Equipment
Industrial Controls
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Intel, Pentium are registered trademarks 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 © 2002–2013, Texas Instruments Incorporated