adm1027 Analog Devices, Inc., adm1027 Datasheet

adm1027

Manufacturer Part Number

adm1027

Description

Dbcool? Remote Thermal Controller And Voltage Monitor

Manufacturer

Analog Devices, Inc.

Datasheet

1.ADM1027.pdf (56 pages)

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*Protected by U.S. Patent Nos. 6,188,189; 6,169,442; 6,097,239; 5,982,221;

REV. A

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective companies.

and 5,867,012. Other patents pending.

FEATURES

Monitors up to 5 Supply Voltages

Controls and Monitors up to 4 Fan Speeds

1 On-Chip and 2 Remote Temperature Sensors

Monitors up to 5 Processor VID Bits

Automatic Fan Speed Control Mode Controls System

Enhanced Acoustic Mode Dramatically Reduces User

2-Wire and 3-Wire Fan Speed Measurement

Limit Comparison of All Monitored Values

Meets SMBus 2.0 Electrical Specifications

APPLICATIONS

Low Acoustic Noise PCs

Networking and Telecommunications Equipment

Cooling Based on Measured Temperature

Perception of Changing Fan Speeds

(Fully SMBus 1.1 Compliant)

+2.5V

TACH1

TACH2

TACH3

TACH4

+12V

PWM1

PWM2

PWM3

+5V

VID4

VID3

VID2

VID1

VID0

D1+

D2+

D1–

D2–

CCP

TEMP. SENSOR

CONTROLLERS

BAND GAP

REGISTERS

TO ADM1027

PWM

AND

FUNCTIONAL BLOCK DIAGRAM

ENHANCEMENT

CONDITIONING

MULTIPLEXER

FAN SPEED

ACOUSTIC

CONTROL

COUNTER

ANALOG

SIGNAL

INPUT

AND

VID

SELECT

ADDR

GND

SELECTION

ADDRESS

SMBUS

GENERAL DESCRIPTION

The ADM1027 dBCOOL controller is a complete systems

monitor and multiple PWM fan controller for noise sensitive

applications requiring active system cooling. It can monitor

12 V, 5 V, 2.5 V CPU supply voltage, plus its own supply volt-

age. It can monitor the temperature of up to two remote sensor

diodes, plus its own internal temperature. It can measure and

control the speed of up to four fans so that they operate at the

lowest possible speed for minimum acoustic noise. The auto-

matic fan speed control loop optimizes fan speed for a given

temperature. Once the control loop parameters are programmed,

the ADM1027 can vary fan speed without CPU intervention.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

ADM1027

AUTOMATIC

FAN SPEED

ADDR EN

CONTROL

REFERENCE

Controller and Voltage Monitor

BAND GAP

10-BIT

ADC

SCL SDA

dB COOL

SERIAL BUS

INTERFACE

SMBALERT

CONFIGURATION

COMPARATORS

INTERRUPT

REGISTERS

VALUE AND

REGISTERS

INTERRUPT

REGISTERS

MASKING

ADDRESS

POINTER

STATUS

LIMIT

PWM

™

Remote Thermal

ADM1027

www.analog.com

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