LM63

1

2

3

4

5

6

7

8

VDD

D+

D-

PWM

SMBCLK

SMBDAT

ALERT / TACH

GND

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

1

FEATURES

DESCRIPTION

The LM63 is a remote diode temperature sensor with

23

•

Accurately Senses Diode-Connected 2N3904

integrated

fan

control.

The

LM63

accurately

Transistors or Thermal Diodes On Board Large

measures: (1) its own temperature and (2) the

Processors or ASICs

temperature of a diode-connected transistor, such as

•

Accurately Senses its Own Temperature

a 2N3904, or a thermal diode commonly found on

Computer Processors, Graphics Processor Units

•

(GPU)

and

other

ASIC's.

The

LM63

remote

Mobile Pentium 4 Processor-M Thermal Diodes

temperature sensor's accuracy is factory trimmed for

•

Integrated PWM Fan Speed Control Output

the series resistance and 1.0021 non-ideality of the

•

Acoustic Fan Noise Reduction With User-

Intel 0.13 µm Pentium 4 and Mobile Pentium 4

Programmable 8-Step Lookup Table

Processor-M thermal diode. The LM63 has an offset

register to correct for errors caused by different non-

•

Multi-Function, User-Selectable Pin for Either

ideality factors of other thermal diodes.

ALERT Output, or Tachometer Input,

Functions

The LM63 also features an integrated, pulse-width-

modulated (PWM), open-drain fan control output. Fan

•

Tachometer Input for Measuring Fan RPM

speed is a combination of the remote temperature

•

Smart-Tach Modes for Measuring RPM of Fans

reading, the lookup table and the register settings.

With Pulse-Width-Modulated Power as Shown

The 8-step Lookup Table enables the user to

in Typical Application

program a non-linear fan speed vs. temperature

•

Offset Register can Adjust for a Variety of

transfer function often used to quiet acoustic fan

Thermal Diodes

noise.

•

10 Bit Plus Sign Remote Diode Temperature

CONNECTION DIAGRAM

Data Format, With 0.125°C Resolution

•

SMBus 2.0 Compatible Interface, Supports

TIMEOUT

•

LM86-Compatible Pinout

•

LM86-Compatible Register Set

•

8-Pin SOIC Package

APPLICATIONS

Figure 1. 8-Pin SOIC (D Package)

•

Computer Processor Thermal Management

(Laptop, Desktop, Workstations, Servers)

•

Graphics Processor Thermal Management

•

Electronic Test Equipment

•

Projectors

•

Office Equipment

•

Industrial Controls

1

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.

2

Intel, Pentium are registered trademarks of Intel Corporation.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2002–2013, 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.