ADT7463 Analog Devices, ADT7463 Datasheet

ADT7463

Manufacturer Part Number

ADT7463

Description

Dbcool Thermal Management Controller And Voltage Monitor

Manufacturer

Analog Devices

Datasheet

1.ADT7463.pdf (28 pages)

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One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • Tel: 781/329-4700 • Fax: 781/326-8703 •

AUTOMATIC FAN SPEED CONTROL

The ADT7460/ADT7463 have a local temperature sensor

and two remote temperature channels that may be con-

nected to an on-chip diode-connected transistor on a

CPU. These three temperature channels may be used as

the basis for automatic fan speed control to drive fans

using pulsewidth modulation (PWM). In general, the

greater the number of fans in a system, the better the

cooling, but this is to the detriment of system acoustics.

Automatic fan speed control reduces acoustic noise

by optimizing fan speed according to measured tem-

perature. Reducing fan speed can also decrease system

current consumption. The automatic fan speed control

mode is very flexible owing to the number of program-

mable parameters, including T

discussed in detail later. The T

REV. 0

REMOTE 1

REMOTE 2

LOCAL

TEMP

Programming the Automatic Fan Speed Control Loop

MIN

THERMAL CALIBRATION

MIN

and T

MIN

Figure 1. Automatic Fan Control Block Diagram

RANGE

and T

100%

values for a

RANGE

, as

By Mary Burke

MUX

temperature channel and thus for a given fan are critical

since these define the thermal characteristics of the sys-

tem. The thermal validation of the system is one of the

most important steps of the design process, so these

values should be carefully selected.

AIM OF THIS SECTION

The aim of this application note is not only to provide

the system designer with an understanding of the auto-

matic fan control loop, but to also provide step-by-step

guidance as to how to most effectively evaluate and

select the critical system parameters. To optimize the

system characteristics, the designer needs to give some

forethought to how the system will be configured, i.e.,

the number of fans, where they are located, and what

temperatures are being measured in the particular

PWM

MIN

TACHOMETER 1

MEASUREMENT

TACHOMETER 2

MEASUREMENT

TACHOMETER 3

MEASUREMENT

ENHANCEMENT

(ACOUSTIC

CONTROL

APPLICATION NOTE

AND 4

RAMP

GENERATOR

CONFIG

PWM

www.analog.com

AN-613

PWM1

PWM2

PWM3

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